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  // BEGIN Math.uuid.js
  
  /*!
  Math.uuid.js (v1.4)
  http://www.broofa.com
  mailto:robert@broofa.com
  
  Copyright (c) 2010 Robert Kieffer
  Dual licensed under the MIT and GPL licenses.
  */
  
  /*
   * Generate a random uuid.
   *
   * USAGE: Math.uuid(length, radix)
   *   length - the desired number of characters
   *   radix  - the number of allowable values for each character.
   *
   * EXAMPLES:
   *   // No arguments  - returns RFC4122, version 4 ID
   *   >>> Math.uuid()
   *   "92329D39-6F5C-4520-ABFC-AAB64544E172"
   *
   *   // One argument - returns ID of the specified length
   *   >>> Math.uuid(15)     // 15 character ID (default base=62)
   *   "VcydxgltxrVZSTV"
   *
   *   // Two arguments - returns ID of the specified length, and radix. (Radix must be <= 62)
   *   >>> Math.uuid(8, 2)  // 8 character ID (base=2)
   *   "01001010"
   *   >>> Math.uuid(8, 10) // 8 character ID (base=10)
   *   "47473046"
   *   >>> Math.uuid(8, 16) // 8 character ID (base=16)
   *   "098F4D35"
   */
  (function() {
    // Private array of chars to use
    var CHARS = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('');
  
    Math.uuid = function (len, radix) {
      var chars = CHARS, uuid = [];
      radix = radix || chars.length;
  
      if (len) {
        // Compact form
        for (var i = 0; i < len; i++) uuid[i] = chars[0 | Math.random()*radix];
      } else {
        // rfc4122, version 4 form
        var r;
  
        // rfc4122 requires these characters
        uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-';
        uuid[14] = '4';
  
        // Fill in random data.  At i==19 set the high bits of clock sequence as
        // per rfc4122, sec. 4.1.5
        for (var i = 0; i < 36; i++) {
          if (!uuid[i]) {
            r = 0 | Math.random()*16;
            uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];
          }
        }
      }
  
      return uuid.join('');
    };
  
    // A more performant, but slightly bulkier, RFC4122v4 solution.  We boost performance
    // by minimizing calls to random()
    Math.uuidFast = function() {
      var chars = CHARS, uuid = new Array(36), rnd=0, r;
      for (var i = 0; i < 36; i++) {
        if (i==8 || i==13 ||  i==18 || i==23) {
          uuid[i] = '-';
        } else if (i==14) {
          uuid[i] = '4';
        } else {
          if (rnd <= 0x02) rnd = 0x2000000 + (Math.random()*0x1000000)|0;
          r = rnd & 0xf;
          rnd = rnd >> 4;
          uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];
        }
      }
      return uuid.join('');
    };
  
    // A more compact, but less performant, RFC4122v4 solution:
    Math.uuidCompact = function() {
      return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
        var r = Math.random()*16|0, v = c == 'x' ? r : (r&0x3|0x8);
        return v.toString(16);
      }).toUpperCase();
    };
  })();
  
  // END Math.uuid.js
  
  /**
  *
  *  MD5 (Message-Digest Algorithm)
  *
  *  For original source see http://www.webtoolkit.info/
  *  Download: 15.02.2009 from http://www.webtoolkit.info/javascript-md5.html
  *
  *  Licensed under CC-BY 2.0 License
  *  (http://creativecommons.org/licenses/by/2.0/uk/)
  *
  **/
  
  var Crypto = {};
  (function() {
    Crypto.MD5 = function(string) {
  
      function RotateLeft(lValue, iShiftBits) {
        return (lValue<<iShiftBits) | (lValue>>>(32-iShiftBits));
      }
  
      function AddUnsigned(lX,lY) {
        var lX4,lY4,lX8,lY8,lResult;
        lX8 = (lX & 0x80000000);
        lY8 = (lY & 0x80000000);
        lX4 = (lX & 0x40000000);
        lY4 = (lY & 0x40000000);
        lResult = (lX & 0x3FFFFFFF)+(lY & 0x3FFFFFFF);
        if (lX4 & lY4) {
          return (lResult ^ 0x80000000 ^ lX8 ^ lY8);
        }
        if (lX4 | lY4) {
          if (lResult & 0x40000000) {
            return (lResult ^ 0xC0000000 ^ lX8 ^ lY8);
          } else {
            return (lResult ^ 0x40000000 ^ lX8 ^ lY8);
          }
        } else {
          return (lResult ^ lX8 ^ lY8);
        }
      }
  
      function F(x,y,z) { return (x & y) | ((~x) & z); }
      function G(x,y,z) { return (x & z) | (y & (~z)); }
      function H(x,y,z) { return (x ^ y ^ z); }
      function I(x,y,z) { return (y ^ (x | (~z))); }
  
      function FF(a,b,c,d,x,s,ac) {
        a = AddUnsigned(a, AddUnsigned(AddUnsigned(F(b, c, d), x), ac));
        return AddUnsigned(RotateLeft(a, s), b);
      };
  
      function GG(a,b,c,d,x,s,ac) {
        a = AddUnsigned(a, AddUnsigned(AddUnsigned(G(b, c, d), x), ac));
        return AddUnsigned(RotateLeft(a, s), b);
      };
  
      function HH(a,b,c,d,x,s,ac) {
        a = AddUnsigned(a, AddUnsigned(AddUnsigned(H(b, c, d), x), ac));
        return AddUnsigned(RotateLeft(a, s), b);
      };
  
      function II(a,b,c,d,x,s,ac) {
        a = AddUnsigned(a, AddUnsigned(AddUnsigned(I(b, c, d), x), ac));
        return AddUnsigned(RotateLeft(a, s), b);
      };
  
      function ConvertToWordArray(string) {
        var lWordCount;
        var lMessageLength = string.length;
        var lNumberOfWords_temp1=lMessageLength + 8;
        var lNumberOfWords_temp2=(lNumberOfWords_temp1-(lNumberOfWords_temp1 % 64))/64;
        var lNumberOfWords = (lNumberOfWords_temp2+1)*16;
        var lWordArray=Array(lNumberOfWords-1);
        var lBytePosition = 0;
        var lByteCount = 0;
        while ( lByteCount < lMessageLength ) {
          lWordCount = (lByteCount-(lByteCount % 4))/4;
          lBytePosition = (lByteCount % 4)*8;
          lWordArray[lWordCount] = (lWordArray[lWordCount] | (string.charCodeAt(lByteCount)<<lBytePosition));
          lByteCount++;
        }
        lWordCount = (lByteCount-(lByteCount % 4))/4;
        lBytePosition = (lByteCount % 4)*8;
        lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80<<lBytePosition);
        lWordArray[lNumberOfWords-2] = lMessageLength<<3;
        lWordArray[lNumberOfWords-1] = lMessageLength>>>29;
        return lWordArray;
      };
  
      function WordToHex(lValue) {
        var WordToHexValue="",WordToHexValue_temp="",lByte,lCount;
        for (lCount = 0;lCount<=3;lCount++) {
          lByte = (lValue>>>(lCount*8)) & 255;
          WordToHexValue_temp = "0" + lByte.toString(16);
          WordToHexValue = WordToHexValue + WordToHexValue_temp.substr(WordToHexValue_temp.length-2,2);
        }
        return WordToHexValue;
      };
  
      //**    function Utf8Encode(string) removed. Aready defined in pidcrypt_utils.js
  
      var x=Array();
      var k,AA,BB,CC,DD,a,b,c,d;
      var S11=7, S12=12, S13=17, S14=22;
      var S21=5, S22=9 , S23=14, S24=20;
      var S31=4, S32=11, S33=16, S34=23;
      var S41=6, S42=10, S43=15, S44=21;
  
      //	string = Utf8Encode(string); #function call removed
  
      x = ConvertToWordArray(string);
  
      a = 0x67452301; b = 0xEFCDAB89; c = 0x98BADCFE; d = 0x10325476;
  
      for (k=0;k<x.length;k+=16) {
        AA=a; BB=b; CC=c; DD=d;
        a=FF(a,b,c,d,x[k+0], S11,0xD76AA478);
        d=FF(d,a,b,c,x[k+1], S12,0xE8C7B756);
        c=FF(c,d,a,b,x[k+2], S13,0x242070DB);
        b=FF(b,c,d,a,x[k+3], S14,0xC1BDCEEE);
        a=FF(a,b,c,d,x[k+4], S11,0xF57C0FAF);
        d=FF(d,a,b,c,x[k+5], S12,0x4787C62A);
        c=FF(c,d,a,b,x[k+6], S13,0xA8304613);
        b=FF(b,c,d,a,x[k+7], S14,0xFD469501);
        a=FF(a,b,c,d,x[k+8], S11,0x698098D8);
        d=FF(d,a,b,c,x[k+9], S12,0x8B44F7AF);
        c=FF(c,d,a,b,x[k+10],S13,0xFFFF5BB1);
        b=FF(b,c,d,a,x[k+11],S14,0x895CD7BE);
        a=FF(a,b,c,d,x[k+12],S11,0x6B901122);
        d=FF(d,a,b,c,x[k+13],S12,0xFD987193);
        c=FF(c,d,a,b,x[k+14],S13,0xA679438E);
        b=FF(b,c,d,a,x[k+15],S14,0x49B40821);
        a=GG(a,b,c,d,x[k+1], S21,0xF61E2562);
        d=GG(d,a,b,c,x[k+6], S22,0xC040B340);
        c=GG(c,d,a,b,x[k+11],S23,0x265E5A51);
        b=GG(b,c,d,a,x[k+0], S24,0xE9B6C7AA);
        a=GG(a,b,c,d,x[k+5], S21,0xD62F105D);
        d=GG(d,a,b,c,x[k+10],S22,0x2441453);
        c=GG(c,d,a,b,x[k+15],S23,0xD8A1E681);
        b=GG(b,c,d,a,x[k+4], S24,0xE7D3FBC8);
        a=GG(a,b,c,d,x[k+9], S21,0x21E1CDE6);
        d=GG(d,a,b,c,x[k+14],S22,0xC33707D6);
        c=GG(c,d,a,b,x[k+3], S23,0xF4D50D87);
        b=GG(b,c,d,a,x[k+8], S24,0x455A14ED);
        a=GG(a,b,c,d,x[k+13],S21,0xA9E3E905);
        d=GG(d,a,b,c,x[k+2], S22,0xFCEFA3F8);
        c=GG(c,d,a,b,x[k+7], S23,0x676F02D9);
        b=GG(b,c,d,a,x[k+12],S24,0x8D2A4C8A);
        a=HH(a,b,c,d,x[k+5], S31,0xFFFA3942);
        d=HH(d,a,b,c,x[k+8], S32,0x8771F681);
        c=HH(c,d,a,b,x[k+11],S33,0x6D9D6122);
        b=HH(b,c,d,a,x[k+14],S34,0xFDE5380C);
        a=HH(a,b,c,d,x[k+1], S31,0xA4BEEA44);
        d=HH(d,a,b,c,x[k+4], S32,0x4BDECFA9);
        c=HH(c,d,a,b,x[k+7], S33,0xF6BB4B60);
        b=HH(b,c,d,a,x[k+10],S34,0xBEBFBC70);
        a=HH(a,b,c,d,x[k+13],S31,0x289B7EC6);
        d=HH(d,a,b,c,x[k+0], S32,0xEAA127FA);
        c=HH(c,d,a,b,x[k+3], S33,0xD4EF3085);
        b=HH(b,c,d,a,x[k+6], S34,0x4881D05);
        a=HH(a,b,c,d,x[k+9], S31,0xD9D4D039);
        d=HH(d,a,b,c,x[k+12],S32,0xE6DB99E5);
        c=HH(c,d,a,b,x[k+15],S33,0x1FA27CF8);
        b=HH(b,c,d,a,x[k+2], S34,0xC4AC5665);
        a=II(a,b,c,d,x[k+0], S41,0xF4292244);
        d=II(d,a,b,c,x[k+7], S42,0x432AFF97);
        c=II(c,d,a,b,x[k+14],S43,0xAB9423A7);
        b=II(b,c,d,a,x[k+5], S44,0xFC93A039);
        a=II(a,b,c,d,x[k+12],S41,0x655B59C3);
        d=II(d,a,b,c,x[k+3], S42,0x8F0CCC92);
        c=II(c,d,a,b,x[k+10],S43,0xFFEFF47D);
        b=II(b,c,d,a,x[k+1], S44,0x85845DD1);
        a=II(a,b,c,d,x[k+8], S41,0x6FA87E4F);
        d=II(d,a,b,c,x[k+15],S42,0xFE2CE6E0);
        c=II(c,d,a,b,x[k+6], S43,0xA3014314);
        b=II(b,c,d,a,x[k+13],S44,0x4E0811A1);
        a=II(a,b,c,d,x[k+4], S41,0xF7537E82);
        d=II(d,a,b,c,x[k+11],S42,0xBD3AF235);
        c=II(c,d,a,b,x[k+2], S43,0x2AD7D2BB);
        b=II(b,c,d,a,x[k+9], S44,0xEB86D391);
        a=AddUnsigned(a,AA);
        b=AddUnsigned(b,BB);
        c=AddUnsigned(c,CC);
        d=AddUnsigned(d,DD);
      }
      var temp = WordToHex(a)+WordToHex(b)+WordToHex(c)+WordToHex(d);
      return temp.toLowerCase();
    }
  })();
  
  // END Crypto.md5.js
  
  //----------------------------------------------------------------------
  //
  // ECMAScript 5 Polyfills
  //
  //----------------------------------------------------------------------
  
  //----------------------------------------------------------------------
  // ES5 15.2 Object Objects
  //----------------------------------------------------------------------
  
  
  
  // ES 15.2.3.6 Object.defineProperty ( O, P, Attributes )
  // Partial support for most common case - getters, setters, and values
  (function() {
    if (!Object.defineProperty ||
        !(function () { try { Object.defineProperty({}, 'x', {}); return true; } catch (e) { return false; } } ())) {
      var orig = Object.defineProperty;
      Object.defineProperty = function (o, prop, desc) {
        "use strict";
  
        // In IE8 try built-in implementation for defining properties on DOM prototypes.
        if (orig) { try { return orig(o, prop, desc); } catch (e) {} }
  
        if (o !== Object(o)) { throw new TypeError("Object.defineProperty called on non-object"); }
        if (Object.prototype.__defineGetter__ && ('get' in desc)) {
          Object.prototype.__defineGetter__.call(o, prop, desc.get);
        }
        if (Object.prototype.__defineSetter__ && ('set' in desc)) {
          Object.prototype.__defineSetter__.call(o, prop, desc.set);
        }
        if ('value' in desc) {
          o[prop] = desc.value;
        }
        return o;
      };
    }
  }());
  
  
  
  // ES5 15.2.3.14 Object.keys ( O )
  // https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/keys
  if (!Object.keys) {
    Object.keys = function (o) {
      if (o !== Object(o)) { throw new TypeError('Object.keys called on non-object'); }
      var ret = [], p;
      for (p in o) {
        if (Object.prototype.hasOwnProperty.call(o, p)) {
          ret.push(p);
        }
      }
      return ret;
    };
  }
  
  //----------------------------------------------------------------------
  // ES5 15.4 Array Objects
  //----------------------------------------------------------------------
  
  
  
  // ES5 15.4.4.18 Array.prototype.forEach ( callbackfn [ , thisArg ] )
  // From https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/forEach
  if (!Array.prototype.forEach) {
    Array.prototype.forEach = function (fun /*, thisp */) {
      "use strict";
  
      if (this === void 0 || this === null) { throw new TypeError(); }
  
      var t = Object(this);
      var len = t.length >>> 0;
      if (typeof fun !== "function") { throw new TypeError(); }
  
      var thisp = arguments[1], i;
      for (i = 0; i < len; i++) {
        if (i in t) {
          fun.call(thisp, t[i], i, t);
        }
      }
    };
  }
  
  
  // ES5 15.4.4.19 Array.prototype.map ( callbackfn [ , thisArg ] )
  // From https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/Map
  if (!Array.prototype.map) {
    Array.prototype.map = function (fun /*, thisp */) {
      "use strict";
  
      if (this === void 0 || this === null) { throw new TypeError(); }
  
      var t = Object(this);
      var len = t.length >>> 0;
      if (typeof fun !== "function") { throw new TypeError(); }
  
      var res = []; res.length = len;
      var thisp = arguments[1], i;
      for (i = 0; i < len; i++) {
        if (i in t) {
          res[i] = fun.call(thisp, t[i], i, t);
        }
      }
  
      return res;
    };
  }
  
  
  "use strict";
  
  var Pouch = function Pouch(name, opts, callback) {
  
    if (!(this instanceof Pouch)) {
      return new Pouch(name, opts, callback);
    }
  
    if (typeof opts === 'function' || typeof opts === 'undefined') {
      callback = opts;
      opts = {};
    }
  
    var backend = Pouch.parseAdapter(opts.name || name);
    opts.name = backend.name;
    opts.adapter = opts.adapter || backend.adapter;
  
    if (!Pouch.adapters[backend.adapter]) {
      throw 'Adapter is missing';
    }
  
    if (!Pouch.adapters[backend.adapter].valid()) {
      throw 'Invalid Adapter';
    }
  
    var adapter = Pouch.adapters[backend.adapter](opts, function(err, db) {
      if (err) {
        if (callback) callback(err);
        return;
      }
      for (var plugin in Pouch.plugins) {
        // In future these will likely need to be async to allow the plugin
        // to initialise
        var pluginObj = Pouch.plugins[plugin](db);
        for (var api in pluginObj) {
          // We let things like the http adapter use its own implementation
          // as it shares a lot of code
          if (!(api in db)) {
            db[api] = pluginObj[api];
          }
        }
      }
      callback(null, db);
    });
    for (var j in adapter) {
      this[j] = adapter[j];
    }
  };
  
  Pouch.DEBUG = false;
  
  Pouch.adapters = {};
  Pouch.plugins = {};
  
  Pouch.parseAdapter = function(name) {
  
    var match = name.match(/([a-z\-]*):\/\/(.*)/);
    if (match) {
      // the http adapter expects the fully qualified name
      name = /http(s?)/.test(match[1]) ? match[1] + '://' + match[2] : match[2];
      var adapter = match[1];
      if (!Pouch.adapters[adapter].valid()) {
        throw 'Invalid adapter';
      }
      return {name: name, adapter: match[1]};
    }
  
    var rank = {'idb': 1, 'leveldb': 2, 'websql': 3, 'http': 4, 'https': 4};
    var rankedAdapter = Object.keys(Pouch.adapters).sort(function(a, b) {
      return rank[a] - rank[b];
    })[0];
  
    return {
      name: name,
      adapter: rankedAdapter
    };
  
    throw 'No Valid Adapter.';
  };
  
  
  Pouch.destroy = function(name, callback) {
    for (var plugin in Pouch.plugins) {
      Pouch.plugins[plugin]._delete(name);
    }
    var opts = Pouch.parseAdapter(name);
    Pouch.adapters[opts.adapter].destroy(opts.name, callback);
  };
  
  Pouch.adapter = function (id, obj) {
    if (obj.valid()) {
      Pouch.adapters[id] = obj;
    }
  };
  
  Pouch.plugin = function(id, obj) {
    Pouch.plugins[id] = obj;
  };
  
  // Enumerate errors, add the status code so we can reflect the HTTP api
  // in future
  Pouch.Errors = {
    MISSING_BULK_DOCS: {
      status: 400,
      error: 'bad_request',
      reason: "Missing JSON list of 'docs'"
    },
    MISSING_DOC: {
      status: 404,
      error: 'not_found',
      reason: 'missing'
    },
    REV_CONFLICT: {
      status: 409,
      error: 'conflict',
      reason: 'Document update conflict'
    },
    INVALID_ID: {
      status: 400,
      error: 'invalid_id',
      reason: '_id field must contain a string'
    },
    MISSING_ID: {
      status: 412,
      error: 'missing_id',
      reason: '_id is required for puts'
    },
    RESERVED_ID: {
      status: 400,
      error: 'bad_request',
      reason: 'Only reserved document ids may start with underscore.'
    },
    NOT_OPEN: {
      status: 412,
      error: 'precondition_failed',
      reason: 'Database not open so cannot close'
    },
    UNKNOWN_ERROR: {
      status: 500,
      error: 'unknown_error',
      reason: 'Database encountered an unknown error'
    }
  };
  
  if (typeof module !== 'undefined' && module.exports) {
    global.Pouch = Pouch;
    Pouch.merge = require('./pouch.merge.js').merge;
    Pouch.collate = require('./pouch.collate.js').collate;
    Pouch.replicate = require('./pouch.replicate.js').replicate;
    Pouch.utils = require('./pouch.utils.js');
    module.exports = Pouch;
  
    // load adapters known to work under node
    var adapters = ['leveldb', 'http'];
    adapters.map(function(adapter) {
      var adapter_path = './adapters/pouch.'+adapter+'.js';
      require(adapter_path);
    });
    require('./plugins/pouchdb.mapreduce.js');
  } else {
    this.Pouch = Pouch;
  }
  
  (function() {
    // a few hacks to get things in the right place for node.js
    if (typeof module !== 'undefined' && module.exports) {
      module.exports = Pouch;
    }
  
    Pouch.collate = function(a, b) {
      var ai = collationIndex(a);
      var bi = collationIndex(b);
      if ((ai - bi) !== 0) {
        return ai - bi;
      }
      if (a === null) {
        return 0;
      }
      if (typeof a === 'number') {
        return a - b;
      }
      if (typeof a === 'boolean') {
        return a < b ? -1 : 1;
      }
      if (typeof a === 'string') {
        return stringCollate(a, b);
      }
      if (Array.isArray(a)) {
        return arrayCollate(a, b)
      }
      if (typeof a === 'object') {
        return objectCollate(a, b);
      }
    }
  
    var stringCollate = function(a, b) {
      // See: https://github.com/daleharvey/pouchdb/issues/40
      // This is incompatible with the CouchDB implementation, but its the
      // best we can do for now
      return (a === b) ? 0 : ((a > b) ? 1 : -1);
    }
  
    var objectCollate = function(a, b) {
      var ak = Object.keys(a), bk = Object.keys(b);
      var len = Math.min(ak.length, bk.length);
      for (var i = 0; i < len; i++) {
        // First sort the keys
        var sort = Pouch.collate(ak[i], bk[i]);
        if (sort !== 0) {
          return sort;
        }
        // if the keys are equal sort the values
        sort = Pouch.collate(a[ak[i]], b[bk[i]]);
        if (sort !== 0) {
          return sort;
        }
  
      }
      return (ak.length === bk.length) ? 0 :
        (ak.length > bk.length) ? 1 : -1;
    }
  
    var arrayCollate = function(a, b) {
      var len = Math.min(a.length, b.length);
      for (var i = 0; i < len; i++) {
        var sort = Pouch.collate(a[i], b[i]);
        if (sort !== 0) {
          return sort;
        }
      }
      return (a.length === b.length) ? 0 :
        (a.length > b.length) ? 1 : -1;
    }
  
    // The collation is defined by erlangs ordered terms
    // the atoms null, true, false come first, then numbers, strings,
    // arrays, then objects
    var collationIndex = function(x) {
      var id = ['boolean', 'number', 'string', 'object'];
      if (id.indexOf(typeof x) !== -1) {
        if (x === null) {
          return 1;
        }
        return id.indexOf(typeof x) + 2;
      }
      if (Array.isArray(x)) {
        return 4.5;
      }
    }
  
  }).call(this);
  
  (function() {
    // a few hacks to get things in the right place for node.js
    if (typeof module !== 'undefined' && module.exports) {
      module.exports = Pouch;
      var utils = require('./pouch.utils.js');
      for (var k in utils) {
        global[k] = utils[k];
      }
    }
  
    // for a better overview of what this is doing, read:
    // https://github.com/apache/couchdb/blob/master/src/couchdb/couch_key_tree.erl
    //
    // But for a quick intro, CouchDB uses a revision tree to store a documents
    // history, A -> B -> C, when a document has conflicts, that is a branch in the
    // tree, A -> (B1 | B2 -> C), We store these as a nested array in the format
    //
    // KeyTree = [Path ... ]
    // Path = {pos: position_from_root, ids: Tree}
    // Tree = [Key, Tree]
  
    // Turn a path as a flat array into a tree with a single branch
    function pathToTree(path) {
      var root = [path.shift(), []];
      var leaf = root;
      while (path.length) {
        nleaf = [path.shift(), []];
        leaf[1].push(nleaf);
        leaf = nleaf;
      }
      return root;
    }
  
    // To ensure we dont grow the revision tree infinitely, we stem old revisions
    function stem(tree, depth) {
      // First we break out the tree into a complete list of root to leaf paths,
      // we cut off the start of the path and generate a new set of flat trees
      var stemmedPaths = rootToLeaf(tree).map(function(path) {
        var stemmed = path.ids.slice(-depth);
        return {
          pos: path.pos + (path.ids.length - stemmed.length),
          ids: pathToTree(stemmed)
        };
      });
      // Then we remerge all those flat trees together, ensuring that we dont
      // connect trees that would go beyond the depth limit
      return stemmedPaths.reduce(function(prev, current, i, arr) {
        return doMerge(prev, current, true).tree;
      }, [stemmedPaths.shift()]);
    }
  
    // Merge two trees together
    function mergeTree(tree1, tree2) {
      var conflicts = false;
      for (var i = 0; i < tree2[1].length; i++) {
        if (!tree1[1][0]) {
          conflicts = 'new_leaf';
          tree1[1][0] = tree2[1][i];
        }
        if (tree1[1][0].indexOf(tree2[1][i][0]) === -1) {
          conflicts = 'new_branch';
          tree1[1].push(tree2[1][i]);
          tree1[1].sort();
        } else {
          var result = mergeTree(tree1[1][0], tree2[1][i]);
          conflicts = result.conflicts || conflicts;
          tree1[1][0] = result.tree;
        }
      }
      return {conflicts: conflicts, tree: tree1};
    }
  
    function doMerge(tree, path, dontExpand) {
      var restree = [];
      var conflicts = false;
      var merged = false;
      var res, branch;
  
      if (!tree.length) {
        return {tree: [path], conflicts: 'new_leaf'};
      }
  
      tree.forEach(function(branch) {
        if (branch.pos === path.pos && branch.ids[0] === path.ids[0]) {
          // Paths start at the same position and have the same root, so they need
          // merged
          res = mergeTree(branch.ids, path.ids);
          restree.push({pos: branch.pos, ids: res.tree});
          conflicts = conflicts || res.conflicts;
          merged = true;
        } else if (dontExpand !== true) {
          // The paths start at a different position, take the earliest path and
          // traverse up until it as at the same point from root as the path we want to
          // merge if the keys match we return the longer path with the other merged
          // After stemming we dont want to expand the trees
  
          // destructive assignment plz
          var t1 = branch.pos < path.pos ? branch : path;
          var t2 = branch.pos < path.pos ? path : branch;
          var diff = t2.pos - t1.pos;
          var parent, tmp = t1.ids;
  
          while(diff--) {
            parent = tmp[1];
            tmp = tmp[1][0];
          }
  
          if (tmp[0] !== t2.ids[0]) {
            restree.push(branch);
          } else {
            res = mergeTree(tmp, t2.ids);
            parent[0] = res.tree;
            restree.push({pos: t1.pos, ids: t1.ids});
            conflicts = conflicts || res.conflicts;
            merged = true;
          }
        } else {
          restree.push(branch);
        }
      });
  
      // We didnt find
      if (!merged) {
        restree.push(path);
      }
  
      restree.sort(function(a, b) {
        return a.pos - b.pos;
      });
  
      return {
        tree: restree,
        conflicts: conflicts || 'internal_node'
      };
    }
  
    Pouch.merge = function(tree, path, depth) {
      // Ugh, nicer way to not modify arguments in place?
      tree = JSON.parse(JSON.stringify(tree));
      path = JSON.parse(JSON.stringify(path));
      var newTree = doMerge(tree, path);
      return {
        tree: stem(newTree.tree, depth),
        conflicts: newTree.conflicts
      };
    };
  
  }).call(this);
  
  if (typeof module !== 'undefined' && module.exports) {
    module.exports = Pouch;
  }
  
  (function() {
  
    function replicate(src, target, opts, callback, replicateRet) {
  
      fetchCheckpoint(src, target, function(checkpoint) {
        var results = [];
        var completed = false;
        var pending = 0;
        var last_seq = checkpoint;
        var continuous = opts.continuous || false;
        var result = {
          ok: true,
          start_time: new Date(),
          docs_read: 0,
          docs_written: 0
        };
  
        function isCompleted() {
          if (completed && pending === 0) {
            result.end_time = new Date();
            writeCheckpoint(src, target, last_seq, function() {
              call(callback, null, result);
            });
          }
        }
  
        if (replicateRet.cancelled) {
          return;
        }
  
        var repOpts = {
          continuous: continuous,
          since: checkpoint,
          onChange: function(change) {
            last_seq = change.seq;
            results.push(change);
            result.docs_read++;
            pending++;
            var diff = {};
            diff[change.id] = change.changes.map(function(x) { return x.rev; });
            target.revsDiff(diff, function(err, diffs) {
              if (err) {
                if (continuous)
                  replicateRet.cancel();
                call(callback, err, null);
                return;
              }
              if (Object.keys(diffs).length === 0) {
                pending--;
                isCompleted();
                return;
              }
              for (var id in diffs) {
                diffs[id].missing.map(function(rev) {
                  src.get(id, {revs: true, rev: rev, attachments: true}, function(err, doc) {
                    target.bulkDocs({docs: [doc]}, {new_edits: false}, function() {
                      if (opts.onChange) {
                        opts.onChange.apply(this, [result]);
                      }
                      result.docs_written++;
                      pending--;
                      isCompleted();
                    });
                  });
                });
              }
            });
          },
          complete: function(err, res) {
            completed = true;
            isCompleted();
          }
        };
  
        if (opts.filter) {
          repOpts.filter = opts.filter;
        }
  
        if (opts.query_params) {
          repOpts.query_params = opts.query_params;
        }
  
        var changes = src.changes(repOpts);
        if (opts.continuous) {
          replicateRet.cancel = changes.cancel;
        }
      });
    }
  
    function toPouch(db, callback) {
      if (typeof db === 'string') {
        return new Pouch(db, callback);
      }
      callback(null, db);
    }
  
    Pouch.replicate = function(src, target, opts, callback) {
      // TODO: This needs some cleaning up, from the replicate call I want
      // to return a promise in which I can cancel continuous replications
      // this will just proxy requests to cancel the changes feed but only
      // after we start actually running the changes feed
      if (opts instanceof Function) {
        callback = opts;
        opts = {}
      }
      if (opts === undefined) {
        opts = {};
      }
  
      var ret = function() {
        this.cancelled = false;
        this.cancel = function() {
          this.cancelled = true;
        }
      }
      var replicateRet = new ret();
      toPouch(src, function(err, src) {
        if (err) {
          return call(callback, err);
        }
        toPouch(target, function(err, target) {
          if (err) {
            return call(callback, err);
          }
          replicate(src, target, opts, callback, replicateRet);
        });
      });
      return replicateRet;
    };
  
  }).call(this);
  
  // Pretty dumb name for a function, just wraps callback calls so we dont
  // to if (callback) callback() everywhere
  var call = function(fun) {
    var args = Array.prototype.slice.call(arguments, 1);
    if (typeof fun === typeof Function) {
      fun.apply(this, args);
    }
  }
  
  // Wrapper for functions that call the bulkdocs api with a single doc,
  // if the first result is an error, return an error
  var yankError = function(callback) {
    return function(err, results) {
      if (err || results[0].error) {
        call(callback, err || results[0]);
      } else {
        call(callback, null, results[0]);
      }
    };
  };
  
  var isAttachmentId = function(id) {
    return (/\//.test(id)
        && !/^_local/.test(id)
        && !/^_design/.test(id));
  }
  
  // Parse document ids: docid[/attachid]
  //   - /attachid is optional, and can have slashes in it too
  //   - int ids and strings beginning with _design or _local are not split
  // returns an object: { docId: docid, attachmentId: attachid }
  var parseDocId = function(id) {
    var ids = (typeof id === 'string') && !(/^_(design|local)\//.test(id))
      ? id.split('/')
      : [id]
    return {
      docId: ids[0],
      attachmentId: ids.splice(1).join('/').replace(/^\/+/, '')
    }
  }
  
  // check if a specific revision of a doc has been deleted
  //  - metadata: the metadata object from the doc store
  //  - rev: (optional) the revision to check. defaults to metadata.rev
  var isDeleted = function(metadata, rev) {
    if (!metadata || !metadata.deletions) return false;
    if (!rev) {
      rev = winningRev(metadata);
    }
    if (rev.indexOf('-') >= 0) {
      rev = rev.split('-')[1];
    }
  
    return metadata.deletions[rev] === true;
  }
  
  // Determine id an ID is valid
  //   - invalid IDs begin with an underescore that does not begin '_design' or '_local'
  //   - any other string value is a valid id
  var isValidId = function(id) {
    if (/^_/.test(id)) {
      return /^_(design|local)/.test(id);
    }
    return true;
  }
  
  // Preprocess documents, parse their revisions, assign an id and a
  // revision for new writes that are missing them, etc
  var parseDoc = function(doc, newEdits) {
    var error = null;
  
    // check for an attachment id and add attachments as needed
    if (doc._id) {
      var id = parseDocId(doc._id);
      if (id.attachmentId !== '') {
        var attachment = btoa(JSON.stringify(doc));
        doc = {
          _id: id.docId,
        }
        if (!doc._attachments) {
          doc._attachments = {};
        }
        doc._attachments[id.attachmentId] = {
          content_type: 'application/json',
          data: attachment
        }
      }
    }
  
    if (newEdits) {
      if (!doc._id) {
        doc._id = Math.uuid();
      }
      var newRevId = Math.uuid(32, 16).toLowerCase();
      var nRevNum;
      if (doc._rev) {
        var revInfo = /^(\d+)-(.+)$/.exec(doc._rev);
        if (!revInfo) {
          throw "invalid value for property '_rev'";
        }
        doc._rev_tree = [{
          pos: parseInt(revInfo[1], 10),
          ids: [revInfo[2], [[newRevId, []]]]
        }];
        nRevNum = parseInt(revInfo[1], 10) + 1;
      } else {
        doc._rev_tree = [{
          pos: 1,
          ids : [newRevId, []]
        }];
        nRevNum = 1;
      }
    } else {
      if (doc._revisions) {
        doc._rev_tree = [{
          pos: doc._revisions.start - doc._revisions.ids.length + 1,
          ids: doc._revisions.ids.reduce(function(acc, x) {
            if (acc === null) {
              return [x, []];
            } else {
              return [x, [acc]];
            }
          }, null)
        }];
        nRevNum = doc._revisions.start;
        newRevId = doc._revisions.ids[0];
      }
      if (!doc._rev_tree) {
        var revInfo = /^(\d+)-(.+)$/.exec(doc._rev);
        nRevNum = parseInt(revInfo[1], 10);
        newRevId = revInfo[2];
        doc._rev_tree = [{
          pos: parseInt(revInfo[1], 10),
          ids: [revInfo[2], []]
        }];
      }
    }
  
    if (typeof doc._id !== 'string') {
      error = Pouch.Errors.INVALID_ID;
    }
    else if (!isValidId(doc._id)) {
      error = Pouch.Errors.RESERVED_ID;
    }
  
    doc._id = decodeURIComponent(doc._id);
    doc._rev = [nRevNum, newRevId].join('-');
  
    if (error) {
      return error;
    }
  
    return Object.keys(doc).reduce(function(acc, key) {
      if (/^_/.test(key) && key !== '_attachments') {
        acc.metadata[key.slice(1)] = doc[key];
      } else {
        acc.data[key] = doc[key];
      }
      return acc;
    }, {metadata : {}, data : {}});
  };
  
  var compareRevs = function(a, b) {
    // Sort by id
    if (a.id !== b.id) {
      return (a.id < b.id ? -1 : 1);
    }
    // Then by deleted
    if (a.deleted ^ b.deleted) {
      return (a.deleted ? -1 : 1);
    }
    // Then by rev id
    if (a.rev_tree[0].pos === b.rev_tree[0].pos) {
      return (a.rev_tree[0].ids < b.rev_tree[0].ids ? -1 : 1);
    }
    // Then by depth of edits
    return (a.rev_tree[0].start < b.rev_tree[0].start ? -1 : 1);
  };
  
  // Pretty much all below can be combined into a higher order function to
  // traverse revisions
  // Turn a tree into a list of rootToLeaf paths
  var expandTree = function(all, i, tree) {
    all.push({rev: i + '-' + tree[0], status: 'available'});
    tree[1].forEach(function(child) {
      expandTree(all, i + 1, child);
    });
  }
  
  var collectRevs = function(path) {
    var revs = [];
    expandTree(revs, path.pos, path.ids);
    return revs;
  }
  
  var collectLeavesInner = function(all, pos, tree) {
    if (!tree[1].length) {
      all.push({rev: pos + '-' + tree[0]});
    }
    tree[1].forEach(function(child) {
      collectLeavesInner(all, pos+1, child);
    });
  }
  
  var collectLeaves = function(revs) {
    var leaves = [];
    revs.forEach(function(tree) {
      collectLeavesInner(leaves, tree.pos, tree.ids);
    });
    return leaves;
  }
  
  var collectConflicts = function(revs) {
    var leaves = collectLeaves(revs);
    // First is current rev
    leaves.shift();
    return leaves.map(function(x) { return x.rev; });
  }
  
  var fetchCheckpoint = function(src, target, callback) {
    var id = Crypto.MD5(src.id() + target.id());
    src.get('_local/' + id, function(err, doc) {
      if (err && err.status === 404) {
        callback(0);
      } else {
        callback(doc.last_seq);
      }
    });
  };
  
  var writeCheckpoint = function(src, target, checkpoint, callback) {
    var check = {
      _id: '_local/' + Crypto.MD5(src.id() + target.id()),
      last_seq: checkpoint
    };
    src.get(check._id, function(err, doc) {
      if (doc && doc._rev) {
        check._rev = doc._rev;
      }
      src.put(check, function(err, doc) {
        callback();
      });
    });
  };
  
  // Turn a tree into a list of rootToLeaf paths
  function expandTree2(all, current, pos, arr) {
    current = current.slice(0);
    current.push(arr[0]);
    if (!arr[1].length) {
      all.push({pos: pos, ids: current});
    }
    arr[1].forEach(function(child) {
      expandTree2(all, current, pos, child);
    });
  }
  
  // We fetch all leafs of the revision tree, and sort them based on tree length
  // and whether they were deleted, undeleted documents with the longest revision
  // tree (most edits) win
  var winningRev = function(metadata) {
    var deletions = metadata.deletions || {};
    var leafs = metadata.rev_tree.map(function(tree) {
      var leaf = treeLeaf(tree.pos, tree.ids);
      leaf.deleted = leaf.id in deletions;
      return leaf;
    });
  
    leafs.sort(function(a, b) {
      if (a.deleted !== b.deleted) {
        return a.deleted > b.deleted;
      }
      return a.pos > b.pos;
    });
    return leafs[0].pos + '-' + leafs[0].id;
  }
  
  var treeLeaf = function(pos, tree) {
    if (!tree[1].length) {
      return {pos: pos, id: tree[0]};
    }
    return treeLeaf(pos + 1, tree[1][0]);
  }
  
  var rootToLeaf = function(tree) {
    var all = [];
    tree.forEach(function(path) {
      expandTree2(all, [], path.pos, path.ids);
    });
    return all;
  }
  
  var arrayFirst = function(arr, callback) {
    for (var i = 0; i < arr.length; i++) {
      if (callback(arr[i], i) === true) {
        return arr[i];
      }
    }
    return false;
  };
  
  var filterChange = function(opts) {
    return function(change) {
      if (opts.filter && !opts.filter.call(this, change.doc)) {
        return;
      }
      if (!opts.include_docs) {
        delete change.doc;
      }
      call(opts.onChange, change);
    }
  }
  
  var ajax = function ajax(options, callback) {
    if (options.success && callback === undefined) {
      callback = options.success;
    }
  
    var success = function sucess(obj, _, xhr) {
      // Chrome will parse some attachments that are JSON. We don't want that.
      if (options.dataType === false && typeof obj !== 'string') {
        obj = JSON.stringify(obj);
      }
      call(callback, null, obj, xhr);
    };
    var error = function error(err) {
      if (err) {
        var errObj = err.responseText
          ? {status: err.status}
          : err
        try {
          errObj = $.extend({}, errObj, JSON.parse(err.responseText));
        } catch (e) {}
        call(callback, errObj);
      } else {
        call(callback, true);
      }
    };
  
    var defaults = {
      success: success,
      error: error,
      headers: {
        Accept: 'application/json',
        'Content-Type': 'application/json',
      },
      dataType: 'json',
      timeout: 10000
    };
    options = $.extend({}, defaults, options);
  
    if (options.data && typeof options.data !== 'string') {
      options.data = JSON.stringify(options.data);
    }
    if (options.auth) {
      options.beforeSend = function(xhr) {
        var token = btoa(options.auth.username + ":" + options.auth.password);
        xhr.setRequestHeader("Authorization", "Basic " + token);
      }
    }
  
    if ($.ajax) {
      return $.ajax(options);
    }
    else {
      // convert options from xhr api to request api
      if (options.data) {
        options.body = options.data;
        delete options.data;
      }
      if (options.type) {
        options.method = options.type;
        delete options.type;
      }
      if (options.auth) {
        var token = btoa(options.auth.username + ':' + options.auth.password);
        options.headers['Authorization'] = 'Basic ' + token;
      }
  
      return request(options, function(err, response, body) {
        if (err) {
          err.status = response ? response.statusCode : 400;
          return call(options.error, err);
        }
  
        var content_type = response.headers['content-type']
          , data = (body || '');
  
        // CouchDB doesn't always return the right content-type for JSON data, so
        // we check for ^{ and }$ (ignoring leading/trailing whitespace)
        if (options.dataType && (/json/.test(content_type)
            || (/^[\s]*{/.test(data) && /}[\s]*$/.test(data)))) {
          data = JSON.parse(data);
        }
  
        if (data.error) {
          data.status = response.statusCode;
          call(options.error, data);
        }
        else {
          call(options.success, data, 'OK', response);
        }
      });
    }
  };
  
  // Basic wrapper for localStorage
  var win = this;
  var localJSON = (function(){
    if (!win.localStorage) {
      return false;
    }
    return {
      set: function(prop, val) {
        localStorage.setItem(prop, JSON.stringify(val));
      },
      get: function(prop, def) {
        try {
          if (localStorage.getItem(prop) === null) {
            return def;
          }
          return JSON.parse((localStorage.getItem(prop) || 'false'));
        } catch(err) {
          return def;
        }
      },
      remove: function(prop) {
        localStorage.removeItem(prop);
      }
    };
  })();
  
  // btoa and atob don't exist in node. see https://developer.mozilla.org/en-US/docs/DOM/window.btoa
  if (typeof btoa === 'undefined') {
    btoa = function(str) {
      return new Buffer(unescape(encodeURIComponent(str)), 'binary').toString('base64');
    }
  }
  if (typeof atob === 'undefined') {
    atob = function(str) {
      return decodeURIComponent(escape(new Buffer(str, 'base64').toString('binary')));
    }
  }
  
  if (typeof module !== 'undefined' && module.exports) {
    // use node.js's crypto library instead of the Crypto object created by deps/uuid.js
    var crypto = require('crypto');
    var Crypto = {
      MD5: function(str) {
        return crypto.createHash('md5').update(str).digest('hex');
      }
    }
    request = require('request');
    _ = require('underscore');
    $ = _;
  
    module.exports = {
      Crypto: Crypto,
      call: call,
      yankError: yankError,
      isAttachmentId: isAttachmentId,
      parseDocId: parseDocId,
      parseDoc: parseDoc,
      isDeleted: isDeleted,
      compareRevs: compareRevs,
      expandTree: expandTree,
      collectRevs: collectRevs,
      collectLeavesInner: collectLeavesInner,
      collectLeaves: collectLeaves,
      collectConflicts: collectConflicts,
      fetchCheckpoint: fetchCheckpoint,
      writeCheckpoint: writeCheckpoint,
      winningRev: winningRev,
      rootToLeaf: rootToLeaf,
      arrayFirst: arrayFirst,
      filterChange: filterChange,
      ajax: ajax,
      atob: atob,
      btoa: btoa,
    }
  }
  
  "use strict";
  
  var HTTP_TIMEOUT = 10000;
  
  // parseUri 1.2.2
  // (c) Steven Levithan <stevenlevithan.com>
  // MIT License
  function parseUri (str) {
    var o = parseUri.options;
    var m = o.parser[o.strictMode ? "strict" : "loose"].exec(str);
    var uri = {};
    var i = 14;
  
    while (i--) uri[o.key[i]] = m[i] || "";
  
    uri[o.q.name] = {};
    uri[o.key[12]].replace(o.q.parser, function ($0, $1, $2) {
      if ($1) uri[o.q.name][$1] = $2;
    });
  
    return uri;
  }
  
  parseUri.options = {
    strictMode: false,
    key: ["source","protocol","authority","userInfo","user","password","host",
          "port","relative","path","directory","file","query","anchor"],
    q:   {
      name:   "queryKey",
      parser: /(?:^|&)([^&=]*)=?([^&]*)/g
    },
    parser: {
      strict: /^(?:([^:\/?#]+):)?(?:\/\/((?:(([^:@]*)(?::([^:@]*))?)?@)?([^:\/?#]*)(?::(\d*))?))?((((?:[^?#\/]*\/)*)([^?#]*))(?:\?([^#]*))?(?:#(.*))?)/,
      loose:  /^(?:(?![^:@]+:[^:@\/]*@)([^:\/?#.]+):)?(?:\/\/)?((?:(([^:@]*)(?::([^:@]*))?)?@)?([^:\/?#]*)(?::(\d*))?)(((\/(?:[^?#](?![^?#\/]*\.[^?#\/.]+(?:[?#]|$)))*\/?)?([^?#\/]*))(?:\?([^#]*))?(?:#(.*))?)/
    }
  };
  
  // Get all the information you possibly can about the URI given by name and
  // return it as a suitable object.
  function getHost(name) {
    // If the given name contains "http:"
    if (/http(s?):/.test(name)) {
      // Prase the URI into all its little bits
      var uri = parseUri(name);
  
      // Store the fact that it is a remote URI
      uri.remote = true;
  
      // Store the user and password as a separate auth object
      if (uri.user || uri.password) {
        uri.auth = {username: uri.user, password: uri.password};
      }
  
      // Split the path part of the URI into parts using '/' as the delimiter
      // after removing any leading '/' and any trailing '/'
      var parts = uri.path.replace(/(^\/|\/$)/g, '').split('/');
  
      // Store the first part as the database name and remove it from the parts
      // array
      uri.db = parts.pop();
  
      // Restore the path by joining all the remaining parts (all the parts
      // except for the database name) with '/'s
      uri.path = parts.join('/');
  
      return uri;
    }
  
    // If the given name does not contain 'http:' then return a very basic object
    // with no host, the current path, the given name as the database name and no
    // username/password
    return {host: '', path: '/', db: name, auth: false};
  }
  
  // Generate a URL with the host data given by opts and the given path
  function genDBUrl(opts, path) {
    // If the host is remote
    if (opts.remote) {
      // If the host already has a path, then we need to have a path delimiter
      // Otherwise, the path delimiter is the empty string
      var pathDel = !opts.path ? '' : '/';
  
      // Return the URL made up of all the host's information and the given path
      return opts.protocol + '://' + opts.host + ':' + opts.port + '/' +
        opts.path + pathDel + opts.db + '/' + path;
    }
  
    // If the host is not remote, then return the URL made up of just the
    // database name and the given path
    return '/' + opts.db + '/' + path;
  }
  
  // Generate a URL with the host data given by opts and the given path
  function genUrl(opts, path) {
    if (opts.remote) {
      return opts.protocol + '://' + opts.host + ':' + opts.port + '/' + path;
    }
    return '/' + path;
  }
  
  // Implements the PouchDB API for dealing with CouchDB instances over HTTP
  var HttpPouch = function(opts, callback) {
  
    // Parse the URI given by opts.name into an easy-to-use object
    var host = getHost(opts.name);
  
    // Generate the database URL based on the host
    var db_url = genDBUrl(host, '');
  
    // The functions that will be publically available for HttpPouch
    var api = {};
  
    var uuids = {
      list: [],
      get: function(opts, callback) {
        if (typeof opts === 'function') {
          callback = opts;
          opts = {count: 10};
        }
        var cb = function(err, body) {
          if (err || !('uuids' in body)) {
            call(callback, err || Pouch.Errors.UNKNOWN_ERROR);
          } else {
            uuids.list = uuids.list.concat(body.uuids);
            call(callback, null, "OK");
          }
        };
        var params = '?count=' + opts.count;
        ajax({
          auth: host.auth,
          type: 'GET',
          url: genUrl(host, '_uuids') + params
        }, cb);
      }
    };
  
    // Create a new CouchDB database based on the given opts
    var createDB = function(){
      ajax({auth: host.auth, type: 'PUT', url: db_url}, function(err, ret) {
        // If we get an "Unauthorized" error
        if (err && err.status === 401) {
          // Test if the database already exists
          ajax({auth: host.auth, type: 'HEAD', url: db_url}, function (err, ret) {
            // If there is still an error
            if (err) {
              // Give the error to the callback to deal with
              call(callback, err);
            } else {
              // Continue as if there had been no errors
              call(callback, null, api);
            }
          });
          // If there were no errros or if the only error is "Precondition Failed"
          // (note: "Precondition Failed" occurs when we try to create a database
          // that already exists)
        } else if (!err || err.status === 412) {
          // Continue as if there had been no errors
          call(callback, null, api);
        } else {
          call(callback, Pouch.Errors.UNKNOWN_ERROR);
        }
      });
    };
    ajax({auth: host.auth, type: 'GET', url: db_url}, function(err, ret) {
      //check if the db exists
      if (err) {
        if (err.status === 404) {
          //if it doesn't, create it
          createDB();
        } else {
          call(callback, err);
        }
      } else {
        //go do stuff with the db
        call(callback, null, api);
        }
    });
  
    api.type = function() {
      return 'http';
    };
  
    // The HttpPouch's ID is its URL
    api.id = function() {
      return genDBUrl(host, '');
    };
  
    api.request = function(options, callback) {
      options.auth = host.auth;
      options.url = genDBUrl(host, options.url);
      ajax(options, callback);
    };
  
    // Calls GET on the host, which gets back a JSON string containing
    //    couchdb: A welcome string
    //    version: The version of CouchDB it is running
    api.info = function(callback) {
      ajax({
        auth: host.auth,
        type:'GET',
        url: genDBUrl(host, ''),
      }, callback);
    };
  
    // Get the document with the given id from the database given by host.
    // The id could be solely the _id in the database, or it may be a
    // _design/ID or _local/ID path
    api.get = function(id, opts, callback) {
      // If no options were given, set the callback to the second parameter
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
  
      // List of parameters to add to the GET request
      var params = [];
  
      // If it exists, add the opts.revs value to the list of parameters.
      // If revs=true then the resulting JSON will include a field
      // _revisions containing an array of the revision IDs.
      if (opts.revs) {
        params.push('revs=true');
      }
  
      // If it exists, add the opts.revs_info value to the list of parameters.
      // If revs_info=true then the resulting JSON will include the field
      // _revs_info containing an array of objects in which each object
      // representing an available revision.
      if (opts.revs_info) {
        params.push('revs_info=true');
      }
  
      // If it exists, add the opts.attachments value to the list of parameters.
      // If attachments=true the resulting JSON will include the base64-encoded
      // contents in the "data" property of each attachment.
      if (opts.attachments) {
        params.push('attachments=true');
      }
  
      // If it exists, add the opts.rev value to the list of parameters.
      // If rev is given a revision number then get the specified revision.
      if (opts.rev) {
        params.push('rev=' + opts.rev);
      }
  
      // If it exists, add the opts.conflicts value to the list of parameters.
      // If conflicts=true then the resulting JSON will include the field
      // _conflicts containing all the conflicting revisions.
      if (opts.conflicts) {
        params.push('conflicts=' + opts.conflicts);
      }
  
      // Format the list of parameters into a valid URI query string
      params = params.join('&');
      params = params === '' ? '' : '?' + params;
  
      // Set the options for the ajax call
      var options = {
        auth: host.auth,
        type: 'GET',
        url: genDBUrl(host, id + params)
      };
  
      // If the given id contains at least one '/' and the part before the '/'
      // is NOT "_design" and is NOT "_local"
      // OR
      // If the given id contains at least two '/' and the part before the first
      // '/' is "_design".
      // TODO This second condition seems strange since if parts[0] === '_design'
      // then we already know that parts[0] !== '_local'.
      var parts = id.split('/');
      if ((parts.length > 1 && parts[0] !== '_design' && parts[0] !== '_local') ||
          (parts.length > 2 && parts[0] === '_design' && parts[0] !== '_local')) {
        // Nothing is expected back from the server
        options.dataType = false;
      }
  
      // Get the document
      ajax(options, function(err, doc, xhr) {
        // If the document does not exist, send an error to the callback
        if (err) {
          return call(callback, Pouch.Errors.MISSING_DOC);
        }
  
        // Send the document to the callback
        call(callback, null, doc, xhr);
      });
    };
  
    // Delete the document given by doc from the database given by host.
    api.remove = function(doc, opts, callback) {
      // If no options were given, set the callback to be the second parameter
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
  
      // Delete the document
      ajax({
        auth: host.auth,
        type:'DELETE',
        url: genDBUrl(host, doc._id) + '?rev=' + doc._rev
      }, callback);
    };
  
    // Remove the attachment given by the id and rev
    api.removeAttachment = function idb_removeAttachment(id, rev, callback) {
      ajax({
        auth: host.auth,
        type: 'DELETE',
        url: genDBUrl(host, id) + '?rev=' + rev,
      }, callback);
    };
  
    // Add the attachment given by doc and the content type given by type
    // to the document with the given id, the revision given by rev, and
    // add it to the database given by host.
    api.putAttachment = function(id, rev, doc, type, callback) {
      // Add the attachment
      ajax({
        auth: host.auth,
        type:'PUT',
        url: genDBUrl(host, id) + '?rev=' + rev,
        headers: {'Content-Type': type},
        data: doc
      }, callback);
    };
  
    // Add the document given by doc (in JSON string format) to the database
    // given by host. This fails if the doc has no _id field.
    api.put = function(doc, opts, callback) {
      // If no options were given, set the callback to be the second parameter
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
  
      if (!doc || !('_id' in doc)) {
        return call(callback, Pouch.Errors.MISSING_ID);
      }
  
      // List of parameter to add to the PUT request
      var params = [];
  
      // If it exists, add the opts.new_edits value to the list of parameters.
      // If new_edits = false then the database will NOT assign this document a
      // new revision number
      if (opts && typeof opts.new_edits !== 'undefined') {
        params.push('new_edits=' + opts.new_edits);
      }
  
      // Format the list of parameters into a valid URI query string
      params = params.join('&');
      if (params !== '') {
        params = '?' + params;
      }
  
      // Add the document
      ajax({
        auth: host.auth,
        type: 'PUT',
        url: genDBUrl(host, doc._id) + params,
        data: doc
      }, callback);
    };
  
    // Add the document given by doc (in JSON string format) to the database
    // given by host. This does not assume that doc is a new document (i.e. does not
    // have a _id or a _rev field.
    api.post = function(doc, opts, callback) {
      // If no options were given, set the callback to be the second parameter
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      if (! ("_id" in doc)) {
        if (uuids.list.length > 0) {
          doc._id = uuids.list.pop();
          api.put(doc, opts, callback);
        }else {
          uuids.get(function(err, resp) {
            if (err) {
              return call(callback, Pouch.Errors.UNKNOWN_ERROR);
            }
            doc._id = uuids.list.pop();
            api.put(doc, opts, callback);
          });
        }
      } else {
        api.put(doc, opts, callback);
      }
    };
  
    // Update/create multiple documents given by req in the database
    // given by host.
    api.bulkDocs = function(req, opts, callback) {
      // If no options were given, set the callback to be the second parameter
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      if (!opts) {
        opts = {}
      }
  
      // If opts.new_edits exists add it to the document data to be
      // send to the database.
      // If new_edits=false then it prevents the database from creating
      // new revision numbers for the documents. Instead it just uses
      // the old ones. This is used in database replication.
      if (typeof opts.new_edits !== 'undefined') {
        req.new_edits = opts.new_edits;
      }
  
      // Update/create the documents
      ajax({
        auth: host.auth,
        type:'POST',
        url: genDBUrl(host, '_bulk_docs'),
        data: req
      }, callback);
    };
  
    // Get a listing of the documents in the database given
    // by host and ordered by increasing id.
    api.allDocs = function(opts, callback) {
      // If no options were given, set the callback to be the second parameter
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
  
      // List of parameters to add to the GET request
      var params = [];
  
      // TODO I don't see conflicts as a valid parameter for a
      // _all_docs request (see http://wiki.apache.org/couchdb/HTTP_Document_API#all_docs)
      if (opts.conflicts) {
        params.push('conflicts=true');
      }
  
      // If opts.include_docs exists, add the include_docs value to the
      // list of parameters.
      // If include_docs=true then include the associated document with each
      // result.
      if (opts.include_docs) {
        params.push('include_docs=true');
      }
  
      // If opts.startkey exists, add the startkey value to the list of
      // parameters.
      // If startkey is given then the returned list of documents will
      // start with the document whose id is startkey.
      if (opts.startkey) {
        params.push('startkey=' +
                    encodeURIComponent(JSON.stringify(opts.startkey)));
      }
  
      // If opts.endkey exists, add the endkey value to the list of parameters.
      // If endkey is given then the returned list of docuemnts will
      // end with the document whose id is endkey.
      if (opts.endkey) {
        params.push('endkey=' + encodeURIComponent(JSON.stringify(opts.endkey)));
      }
  
      // Format the list of parameters into a valid URI query string
      params = params.join('&');
      if (params !== '') {
        params = '?' + params;
      }
  
      // Get the document listing
      ajax({
        auth: host.auth,
        type:'GET',
        url: genDBUrl(host, '_all_docs' + params)
      }, callback);
    };
    // Get a list of changes made to documents in the database given by host.
    // TODO According to the README, there should be two other methods here,
    // api.changes.addListener and api.changes.removeListener.
    api.changes = function(opts, callback) {
      // If no options were given, set the callback to the first parameter
      if (typeof opts === 'function') {
        opts = {complete: opts};
      }
  
      // If a callback was provided outside of opts, then it is the one that
      // will be called upon completion
      if (callback) {
        opts.complete = callback;
      }
  
      if (Pouch.DEBUG)
        console.log(db_url + ': Start Changes Feed: continuous=' + opts.continuous);
  
      // Query string of all the parameters to add to the GET request
      var params = '?style=all_docs';
  
      // If opts.include_docs exists, opts.filter exists, and opts.filter is a
      // function, add the include_docs value to the query string.
      // If include_docs=true then include the associated document with each
      // result.
      if (opts.include_docs || opts.filter && typeof opts.filter === 'function') {
        params += '&include_docs=true';
      }
  
      // If opts.continuous exists, add the feed value to the query string.
      // If feed=longpoll then it waits for either a timeout or a change to
      // occur before returning.
      if (opts.continuous) {
        params += '&feed=longpoll';
      }
  
      // If opts.conflicts exists, add the conflicts value to the query string.
      // TODO I can't find documentation of what conflicts=true does. See
      // http://wiki.apache.org/couchdb/HTTP_database_API#Changes
      if (opts.conflicts) {
        params += '&conflicts=true';
      }
  
      // If opts.descending exists, add the descending value to the query string.
      // if descending=true then the change results are returned in
      // descending order (most recent change first).
      if (opts.descending) {
        params += '&descending=true';
      }
  
      // If opts.filter exists and is a string then add the filter value
      // to the query string.
      // If filter is given a string containing the name of a filter in
      // the design, then only documents passing through the filter will
      // be returned.
      if (opts.filter && typeof opts.filter === 'string') {
        params += '&filter=' + opts.filter;
      }
  
      // If opts.query_params exists, pass it through to the changes request.
      // These parameters may be used by the filter on the source database.
      if (opts.query_params && typeof opts.query_params === 'object') {
        for (var param_name in opts.query_params) {
          if (opts.query_params.hasOwnProperty(param_name)) {
            params += '&'+param_name+'='+opts.query_params[param_name];
          }
        }
      }
  
      var xhr;
      var last_seq;
  
      // Get all the changes starting wtih the one immediately after the
      // sequence number given by since.
      var fetch = function(since, callback) {
        // Set the options for the ajax call
        var xhrOpts = {
          auth: host.auth, type:'GET',
          url: genDBUrl(host, '_changes' + params + '&since=' + since),
          timeout: null          // _changes can take a long time to generate, especially when filtered
        };
        last_seq = since;
  
        if (opts.aborted) {
          return;
        }
  
        // Get the changes
        xhr = ajax(xhrOpts, callback);
      };
  
      // If opts.since exists, get all the changes from the sequence
      // number given by opts.since. Otherwise, get all the changes
      // from the sequence number 0.
      var fetchTimeout = 10;
      var fetchRetryCount = 0;
      var fetched = function(err, res) {
        // If the result of the ajax call (res) contains changes (res.results)
        if (res && res.results) {
          // For each change
          res.results.forEach(function(c) {
            var hasFilter = opts.filter && typeof opts.filter === 'function';
            if (opts.aborted || hasFilter && !opts.filter.apply(this, [c.doc])) {
              return;
            }
  
            // Process the change
            call(opts.onChange, c);
          });
        }
        // The changes feed may have timed out with no results
        // if so reuse last update sequence
        if (res && res.last_seq) {
          last_seq = res.last_seq;
        }
  
        if (opts.continuous) {
          // Increase retry delay exponentially as long as errors persist
          if (err) fetchRetryCount += 1;
          else fetchRetryCount = 0;
          var timeoutMultiplier = 1 << fetchRetryCount;       // i.e. Math.pow(2, fetchRetryCount)
          
          var retryWait = fetchTimeout * timeoutMultiplier;
          var maximumWait = opts.maximumWait || 30000;
          if (retryWait > maximumWait) {
            call(opts.complete, err || Pouch.Errors.UNKNOWN_ERROR, null);
          }
          
          // Queue a call to fetch again with the newest sequence number
          setTimeout(function () {
            fetch(last_seq, fetched);
          }, retryWait);
        } else {
          // We're done, call the callback
          call(opts.complete, null, res);
        }
      };
  
      fetch(opts.since || 0, fetched);
  
      // Return a method to cancel this method from processing any more
      return {
        cancel: function() {
          if (Pouch.DEBUG)
            console.log(db_url + ': Cancel Changes Feed');
          opts.aborted = true;
          xhr.abort();
        }
      };
    };
  
    // Given a set of document/revision IDs (given by req), tets the subset of
    // those that do NOT correspond to revisions stored in the database.
    // See http://wiki.apache.org/couchdb/HttpPostRevsDiff
    api.revsDiff = function(req, opts, callback) {
      // If no options were given, set the callback to be the second parameter
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
  
      // Get the missing document/revision IDs
      ajax({
        auth: host.auth,
        type:'POST',
        url: genDBUrl(host, '_revs_diff'),
        data: req
      }, function(err, res) {
        call(callback, null, res);
      });
    };
  
    api.replicate = {};
  
    // Replicate from the database given by url to this HttpPouch
    api.replicate.from = function(url, opts, callback) {
      // If no options were given, set the callback to be the second parameter
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      return Pouch.replicate(url, api, opts, callback);
    };
  
    // Replicate to the database given by dbName from this HttpPouch
    api.replicate.to = function(dbName, opts, callback) {
      // If no options were given, set the callback to be the second parameter
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      return Pouch.replicate(api, dbName, opts, callback);
    };
  
    api.close = function(callback) {
      call(callback, null);
    };
  
    return api;
  };
  
  // Delete the HttpPouch specified by the given name.
  HttpPouch.destroy = function(name, callback) {
    var host = getHost(name);
    ajax({auth: host.auth, type: 'DELETE', url: genDBUrl(host, '')}, callback);
  };
  
  // HttpPouch is a valid adapter.
  HttpPouch.valid = function() {
    return true;
  };
  
  if (typeof module !== 'undefined' && module.exports) {
    // running in node
    var pouchdir = '../';
    this.Pouch = require(pouchdir + 'pouch.js')
    this.ajax = Pouch.utils.ajax;
  }
  
  // Set HttpPouch to be the adapter used with the http scheme.
  Pouch.adapter('http', HttpPouch);
  Pouch.adapter('https', HttpPouch);
  
  // While most of the IDB behaviors match between implementations a
  // lot of the names still differ. This section tries to normalize the
  // different objects & methods.
  window.indexedDB = window.indexedDB ||
    window.mozIndexedDB ||
    window.webkitIndexedDB;
  
  // still needed for R/W transactions in Android Chrome. follow MDN example:
  // https://developer.mozilla.org/en-US/docs/IndexedDB/IDBDatabase#transaction
  window.IDBTransaction = window.IDBTransaction ||
    window.webkitIDBTransaction ||
    { READ_WRITE: 'readwrite' };
  
  window.IDBKeyRange = window.IDBKeyRange ||
    window.webkitIDBKeyRange;
  
  window.storageInfo = window.storageInfo ||
    window.webkitStorageInfo;
  
  window.requestFileSystem = window.requestFileSystem ||
      window.webkitRequestFileSystem;
  
  var idbError = function(callback) {
    return function(event) {
      call(callback, {
        status: 500,
        error: event.type,
        reason: event.target
      });
    };
  };
  
  var IdbPouch = function(opts, callback) {
  
    // IndexedDB requires a versioned database structure, this is going to make
    // it hard to dynamically create object stores if we needed to for things
    // like views
    var POUCH_VERSION = 1;
  
    // The object stores created for each database
    // DOC_STORE stores the document meta data, its revision history and state
    var DOC_STORE = 'document-store';
    // BY_SEQ_STORE stores a particular version of a document, keyed by its
    // sequence id
    var BY_SEQ_STORE = 'by-sequence';
    // Where we store attachments
    var ATTACH_STORE = 'attach-store';
  
    var name = opts.name;
    var req = indexedDB.open(name, POUCH_VERSION);
    var update_seq = 0;
  
  
    // var storeAttachmentsInIDB = !(window.storageInfo && window.requestFileSystem);
    // We cant store attachments on the filesystem due to a limitation in the
    // indexeddb api, it will close a transaction when we yield to the event loop
    var storeAttachmentsInIDB = true;
  
    var api = {};
    var idb = null;
  
    if (Pouch.DEBUG)
      console.log(name + ': Open Database');
  
    // TODO: before we release, make sure we write upgrade needed
    // in a way that supports a future upgrade path
    req.onupgradeneeded = function(e) {
      var db = e.target.result;
      db.createObjectStore(DOC_STORE, {keyPath : 'id'})
        .createIndex('seq', 'seq', {unique: true});
      db.createObjectStore(BY_SEQ_STORE, {autoIncrement : true})
        .createIndex('_rev', '_rev', {unique: true});
      db.createObjectStore(ATTACH_STORE, {keyPath: 'digest'});
    };
  
    req.onsuccess = function(e) {
  
      idb = e.target.result;
  
      idb.onversionchange = function() {
        idb.close();
      };
  
      // polyfill the new onupgradeneeded api for chrome. can get rid of when
      // saucelabs moves to chrome 23
      if (idb.setVersion && Number(idb.version) !== POUCH_VERSION) {
        var versionReq = idb.setVersion(POUCH_VERSION);
        versionReq.onsuccess = function(evt) {
          function setVersionComplete() {
            req.onsuccess(e);
          }
          evt.target.result.oncomplete = setVersionComplete;
          req.onupgradeneeded(e);
        };
        return;
      }
  
      // TODO: This is a really inneficient way of finding the last
      // update sequence, cant think of an alterative right now
      api.changes(function(err, changes) {
        if (changes.results.length) {
          update_seq = changes.results[changes.results.length - 1].seq;
        }
        call(callback, null, api);
      });
  
    };
  
    req.onerror = idbError(callback);
  
    api.type = function() {
      return 'idb';
    };
  
    // Each database needs a unique id so that we can store the sequence
    // checkpoint without having other databases confuse itself, since
    // localstorage is per host this shouldnt conflict, if localstorage
    // gets wiped it isnt fatal, replications will just start from scratch
    api.id = function idb_id() {
      var id = localJSON.get(name + '_id', null);
      if (id === null) {
        id = Math.uuid();
        localJSON.set(name + '_id', id);
      }
      return id;
    };
  
    api.bulkDocs = function idb_bulkDocs(req, opts, callback) {
  
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      if (!opts) {
        opts = {};
      }
  
      if (!req.docs) {
        return call(callback, Pouch.Errors.MISSING_BULK_DOCS);
      }
  
      var newEdits = 'new_edits' in opts ? opts.new_edits : true;
      var userDocs = JSON.parse(JSON.stringify(req.docs));
  
      // Parse the docs, give them a sequence number for the result
      var docInfos = userDocs.map(function(doc, i) {
        var newDoc = parseDoc(doc, newEdits);
        newDoc._bulk_seq = i;
        if (doc._deleted) {
          if (!newDoc.metadata.deletions) {
            newDoc.metadata.deletions = {};
          }
          newDoc.metadata.deletions[doc._rev.split('-')[1]] = true;
        }
        return newDoc;
      });
  
      var results = [];
      var docs = [];
  
      // Group multiple edits to the same document
      docInfos.forEach(function(docInfo) {
        if (docInfo.error) {
          return results.push(docInfo);
        }
        if (!docs.length || docInfo.metadata.id !== docs[0].metadata.id) {
          return docs.unshift(docInfo);
        }
        // We mark subsequent bulk docs with a duplicate id as conflicts
        results.push(makeErr(Pouch.Errors.REV_CONFLICT, docInfo._bulk_seq));
      });
  
      function processDocs() {
        if (!docs.length) {
          return;
        }
        var currentDoc = docs.shift();
        var req = txn.objectStore(DOC_STORE).get(currentDoc.metadata.id);
        req.onsuccess = function process_docRead(event) {
          var oldDoc = event.target.result;
          if (!oldDoc) {
            insertDoc(currentDoc);
          } else {
            updateDoc(oldDoc, currentDoc);
          }
        };
      }
  
      function complete(event) {
        var aresults = [];
        results.sort(sortByBulkSeq);
        results.forEach(function(result) {
          delete result._bulk_seq;
          if (result.error) {
            aresults.push(result);
            return;
          }
          var metadata = result.metadata;
          var rev = winningRev(metadata);
  
          aresults.push({
            ok: true,
            id: metadata.id,
            rev: rev
          });
  
          if (/_local/.test(metadata.id)) {
            return;
          }
  
          var change = {
            id: metadata.id,
            seq: metadata.seq,
            changes: collectLeaves(metadata.rev_tree),
            doc: result.data
          };
          change.doc._rev = rev;
          update_seq++;
          IdbPouch.Changes.emitChange(name, change);
        });
        call(callback, null, aresults);
      }
  
      function writeDoc(docInfo, callback) {
        var err = null;
        var recv = 0;
  
        docInfo.data._id = docInfo.metadata.id;
        docInfo.data._rev = docInfo.metadata.rev;
  
        if (isDeleted(docInfo.metadata, docInfo.metadata.rev)) {
          docInfo.data._deleted = true;
        }
  
        var attachments = docInfo.data._attachments ?
          Object.keys(docInfo.data._attachments) : [];
  
        for (var key in docInfo.data._attachments) {
          if (!docInfo.data._attachments[key].stub) {
            var data = docInfo.data._attachments[key].data;
            var digest = 'md5-' + Crypto.MD5(data);
            delete docInfo.data._attachments[key].data;
            docInfo.data._attachments[key].digest = digest;
            saveAttachment(docInfo, digest, data, function(err) {
              recv++;
              collectResults(err);
            });
          } else {
            recv++;
            collectResults();
          }
        }
  
        if (!attachments.length) {
          finish();
        }
  
        function collectResults(attachmentErr) {
          if (!err) {
            if (attachmentErr) {
              err = attachmentErr;
              call(callback, err);
            } else if (recv == attachments.length) {
              finish();
            }
          }
        }
  
        function finish() {
          var dataReq = txn.objectStore(BY_SEQ_STORE).put(docInfo.data);
          dataReq.onsuccess = function(e) {
            if (Pouch.DEBUG)
              console.log(name + ': Wrote Document ', docInfo.metadata.id);
            docInfo.metadata.seq = e.target.result;
            // Current _rev is calculated from _rev_tree on read
            delete docInfo.metadata.rev;
            var metaDataReq = txn.objectStore(DOC_STORE).put(docInfo.metadata);
            metaDataReq.onsuccess = function() {
              results.push(docInfo);
              call(callback);
            };
          };
        }
      }
  
      function updateDoc(oldDoc, docInfo) {
        var merged = Pouch.merge(oldDoc.rev_tree, docInfo.metadata.rev_tree[0], 1000);
  
        var inConflict = (isDeleted(oldDoc) && isDeleted(docInfo.metadata)) ||
          (!isDeleted(oldDoc) && newEdits && merged.conflicts !== 'new_leaf');
  
        if (inConflict) {
          results.push(makeErr(Pouch.Errors.REV_CONFLICT, docInfo._bulk_seq));
          return processDocs();
        }
  
        docInfo.metadata.rev_tree = merged.tree;
        writeDoc(docInfo, processDocs);
      }
  
      function insertDoc(docInfo) {
        // Cant insert new deleted documents
        if ('was_delete' in opts && isDeleted(docInfo.metadata)) {
          results.push(Pouch.Errors.MISSING_DOC);
          return processDocs();
        }
        writeDoc(docInfo, processDocs);
      }
  
      // Insert sequence number into the error so we can sort later
      function makeErr(err, seq) {
        err._bulk_seq = seq;
        return err;
      }
  
      function saveAttachment(docInfo, digest, data, callback) {
        if (storeAttachmentsInIDB) {
          var objectStore = txn.objectStore(ATTACH_STORE);
          var getReq = objectStore.get(digest).onsuccess = function(e) {
            var ref = [docInfo.metadata.id, docInfo.metadata.rev].join('@');
            var newAtt = {digest: digest, body: data};
  
            if (e.target.result) {
              if (e.target.result.refs) {
                // only update references if this attachment already has them
                // since we cannot migrate old style attachments here without
                // doing a full db scan for references
                newAtt.refs = e.target.result.refs;
                newAtt.refs[ref] = true;
              }
            } else {
              newAtt.refs = {};
              newAtt.refs[ref] = true;
            }
  
            var putReq = objectStore.put(newAtt).onsuccess = function(e) {
              call(callback);
            };
            putReq.onerror = putReq.ontimeout = idbError(callback);
          };
          getReq.onerror = getReq.ontimeout = idbError(callback);
        } else {
          // right now fire and forget, needs cleaned
          writeAttachmentToFile(digest,data);
          call(callback);
        }
      }
  
      var txn = idb.transaction([DOC_STORE, BY_SEQ_STORE, ATTACH_STORE], IDBTransaction.READ_WRITE);
      txn.onerror = idbError(callback);
      txn.ontimeout = idbError(callback);
      txn.oncomplete = complete;
  
      processDocs();
  
    };
  
    function sortByBulkSeq(a, b) {
      return a._bulk_seq - b._bulk_seq;
    }
  
    // First we look up the metadata in the ids database, then we fetch the
    // current revision(s) from the by sequence store
    api.get = function idb_get(id, opts, callback) {
  
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
  
      id = parseDocId(id);
      if (id.attachmentId !== '') {
        return api.getAttachment(id, {decode: true}, callback);
      }
  
      var result;
      var txn = idb.transaction([DOC_STORE, BY_SEQ_STORE, ATTACH_STORE], 'readonly');
      txn.oncomplete = function() {
        if ('error' in result) {
          call(callback, result);
        } else {
          call(callback, null, result);
        }
      };
  
      txn.objectStore(DOC_STORE).get(id.docId).onsuccess = function(e) {
        var metadata = e.target.result;
        if (!e.target.result || (isDeleted(metadata, opts.rev) && !opts.rev)) {
          result = Pouch.Errors.MISSING_DOC;
          return;
        }
  
        var rev = winningRev(metadata);
        var key = opts.rev ? opts.rev : rev;
        var index = txn.objectStore(BY_SEQ_STORE).index('_rev');
  
        index.get(key).onsuccess = function(e) {
          var doc = e.target.result;
          if (opts.revs) {
            var path = arrayFirst(rootToLeaf(metadata.rev_tree), function(arr) {
              return arr.ids.indexOf(doc._rev.split('-')[1]) !== -1;
            });
            path.ids.reverse();
            doc._revisions = {
              start: (path.pos + path.ids.length) - 1,
              ids: path.ids
            };
          }
          if (opts.revs_info) {
            doc._revs_info = metadata.rev_tree.reduce(function(prev, current) {
              return prev.concat(collectRevs(current));
            }, []);
          }
          if (opts.conflicts) {
            var conflicts = collectConflicts(metadata.rev_tree);
            if (conflicts.length) {
              doc._conflicts = conflicts;
            }
          }
  
          if (opts.attachments && doc._attachments) {
            var attachments = Object.keys(doc._attachments);
            var recv = 0;
  
            attachments.forEach(function(key) {
              api.getAttachment(doc._id + '/' + key, {txn: txn}, function(err, data) {
                doc._attachments[key].data = data;
  
                if (++recv === attachments.length) {
                  result = doc;
                }
              });
            });
          } else {
            if (doc._attachments){
              for (var key in doc._attachments) {
                doc._attachments[key].stub = true;
              }
            }
            result = doc;
          }
        };
      };
    };
  
    api.getAttachment = function(id, opts, callback) {
      if (opts instanceof Function) {
        callback = opts;
        opts = {};
      }
      if (typeof id === 'string') {
        id = parseDocId(id);
      }
  
      var result;
      var txn;
  
      // This can be called while we are in a current transaction, pass the context
      // along and dont wait for the transaction to complete here.
      if ('txn' in opts) {
        txn = opts.txn;
      } else {
        txn = idb.transaction([DOC_STORE, BY_SEQ_STORE, ATTACH_STORE], 'readonly');
        txn.oncomplete = function() { call(callback, null, result); }
      }
  
      txn.objectStore(DOC_STORE).get(id.docId).onsuccess = function(e) {
        var metadata = e.target.result;
        var bySeq = txn.objectStore(BY_SEQ_STORE);
        bySeq.get(metadata.seq).onsuccess = function(e) {
          var attachment = e.target.result._attachments[id.attachmentId];
          var digest = attachment.digest;
          var type = attachment.content_type
  
          function postProcessDoc(data) {
            if (opts.decode) {
              data = atob(data);
            }
            return data;
          }
  
          if (storeAttachmentsInIDB) {
            txn.objectStore(ATTACH_STORE).get(digest).onsuccess = function(e) {
              var data = e.target.result.body;
              result = postProcessDoc(data);
              if ('txn' in opts) {
                call(callback, null, result);
              }
            }
          } else {
            // This will be buggy, it will cause the transaction to be closed
            // as we will be returning to the event loop waiting on the file to
            // read, switch back to idb asap
            readAttachmentFromFile(digest, function(data) {
              result = postProcessDoc(data);
              if ('txn' in opts) {
                call(callback, null, result);
              }
            });
          }
        };
      }
      return;
    }
  
    api.put = function(doc, opts, callback) {
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
  
      if (!doc || !('_id' in doc)) {
        return call(callback, Pouch.Errors.MISSING_ID);
      }
      return api.bulkDocs({docs: [doc]}, opts, yankError(callback));
    }
  
    api.post = function idb_put(doc, opts, callback) {
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      return api.bulkDocs({docs: [doc]}, opts, yankError(callback));
    };
  
    api.putAttachment = function idb_putAttachment(id, rev, doc, type, callback) {
      id = parseDocId(id);
      api.get(id.docId, {attachments: true}, function(err, obj) {
        obj._attachments || (obj._attachments = {});
        obj._attachments[id.attachmentId] = {
          content_type: type,
          data: btoa(doc)
        }
        api.put(obj, callback);
      });
    };
  
    api.remove = function idb_remove(doc, opts, callback) {
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      opts.was_delete = true;
      var newDoc = JSON.parse(JSON.stringify(doc));
      newDoc._deleted = true;
      return api.bulkDocs({docs: [newDoc]}, opts, yankError(callback));
    };
  
    api.removeAttachment = function idb_removeAttachment(id, rev, callback) {
      id = parseDocId(id);
      api.get(id.docId, function(err, obj) {
        if (err) {
          call(callback, err);
          return;
        }
  
        if (obj._rev != rev) {
          call(callback, Pouch.Errors.REV_CONFLICT);
          return;
        }
  
        obj._attachments || (obj._attachments = {});
        delete obj._attachments[id.attachmentId];
        api.put(obj, callback);
      });
    };
  
    api.allDocs = function idb_allDocs(opts, callback) {
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
  
      var start = 'startkey' in opts ? opts.startkey : false;
      var end = 'endkey' in opts ? opts.endkey : false;
  
      var descending = 'descending' in opts ? opts.descending : false;
      descending = descending ? 'prev' : null;
  
      var keyRange = start && end ? IDBKeyRange.bound(start, end, false, false)
        : start ? IDBKeyRange.lowerBound(start, true)
        : end ? IDBKeyRange.upperBound(end) : null;
  
      var result;
      var transaction = idb.transaction([DOC_STORE, BY_SEQ_STORE], 'readonly');
      transaction.oncomplete = function() { callback(null, result); };
  
      var oStore = transaction.objectStore(DOC_STORE);
      var oCursor = descending ? oStore.openCursor(keyRange, descending)
        : oStore.openCursor(keyRange);
      var results = [];
      oCursor.onsuccess = function(e) {
        if (!e.target.result) {
          result = {
            total_rows: results.length,
            rows: results
          };
          return;
        }
        var cursor = e.target.result;
        function allDocsInner(metadata, data) {
          if (/_local/.test(metadata.id)) {
            return cursor['continue']();
          }
          if (!isDeleted(metadata)) {
            var doc = {
              id: metadata.id,
              key: metadata.id,
              value: {
                rev: winningRev(metadata)
              }
            };
            if (opts.include_docs) {
              doc.doc = data;
              doc.doc._rev = winningRev(metadata);
              if (opts.conflicts) {
                doc.doc._conflicts = collectConflicts(metadata.rev_tree);
              }
            }
            results.push(doc);
          }
          cursor['continue']();
        }
  
        if (!opts.include_docs) {
          allDocsInner(cursor.value);
        } else {
          var index = transaction.objectStore(BY_SEQ_STORE);
          index.get(cursor.value.seq).onsuccess = function(event) {
            allDocsInner(cursor.value, event.target.result);
          };
        }
      }
    };
  
    // Looping through all the documents in the database is a terrible idea
    // easiest to implement though, should probably keep a counter
    api.info = function idb_info(callback) {
      var count = 0;
      var result;
      var txn = idb.transaction([DOC_STORE], 'readonly');
  
      txn.oncomplete = function() {
        callback(null, result);
      };
  
      txn.objectStore(DOC_STORE).openCursor().onsuccess = function(e) {
          var cursor = e.target.result;
          if (!cursor) {
            result = {
              db_name: name,
              doc_count: count,
              update_seq: update_seq
            };
            return;
          }
          if (cursor.value.deleted !== true) {
            count++;
          }
          cursor['continue']();
        };
    };
  
    api.revsDiff = function idb_revsDiff(req, opts, callback) {
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      var ids = Object.keys(req);
      var count = 0;
      var missing = {};
  
      function readDoc(err, doc, id) {
        req[id].map(function(revId) {
          var matches = function(x) { return x.rev !== revId; };
          if (!doc || doc._revs_info.every(matches)) {
            if (!missing[id]) {
              missing[id] = {missing: []};
            }
            missing[id].missing.push(revId);
          }
        });
  
        if (++count === ids.length) {
          return call(callback, null, missing);
        }
      }
  
      ids.map(function(id) {
        api.get(id, {revs_info: true}, function(err, doc) {
          readDoc(err, doc, id);
        });
      });
    };
  
    api.changes = function idb_changes(opts, callback) {
  
      if (typeof opts === 'function') {
        opts = {complete: opts};
      }
      if (callback) {
        opts.complete = callback;
      }
      if (!opts.seq) {
        opts.seq = 0;
      }
      if (opts.since) {
        opts.seq = opts.since;
      }
  
      if (Pouch.DEBUG)
        console.log(name + ': Start Changes Feed: continuous=' + opts.continuous);
  
      var descending = 'descending' in opts ? opts.descending : false;
      descending = descending ? 'prev' : null;
  
      var results = [], resultIndices = {}, dedupResults = [];
      var id = name + ':' + Math.uuid();
      var txn;
  
      if (opts.filter && typeof opts.filter === 'string') {
        var filterName = opts.filter.split('/');
        api.get('_design/' + filterName[0], function(err, ddoc) {
          var filter = eval('(function() { return ' +
                            ddoc.filters[filterName[1]] + ' })()');
          opts.filter = filter;
          fetchChanges();
        });
      } else {
        fetchChanges();
      }
  
      function fetchChanges() {
        txn = idb.transaction([DOC_STORE, BY_SEQ_STORE]);
        txn.oncomplete = onTxnComplete;
        var req = descending
          ? txn.objectStore(BY_SEQ_STORE)
            .openCursor(IDBKeyRange.lowerBound(opts.seq, true), descending)
          : txn.objectStore(BY_SEQ_STORE)
            .openCursor(IDBKeyRange.lowerBound(opts.seq, true));
        req.onsuccess = onsuccess;
        req.onerror = onerror;
      }
  
      function onsuccess(event) {
        if (!event.target.result) {
          if (opts.continuous && !opts.cancelled) {
            IdbPouch.Changes.addListener(name, id, opts);
          }
  
          // Filter out null results casued by deduping
          for (var i = 0, l = results.length; i < l; i++ ) {
            var result = results[i];
            if (result) dedupResults.push(result);
          }
          return false;
        }
        var cursor = event.target.result;
        var index = txn.objectStore(DOC_STORE);
        index.get(cursor.value._id).onsuccess = function(event) {
          var metadata = event.target.result;
          if (/_local/.test(metadata.id)) {
            return cursor['continue']();
          }
  
          var change = {
            id: metadata.id,
            seq: cursor.key,
            changes: collectLeaves(metadata.rev_tree),
            doc: cursor.value,
          };
  
          change.doc._rev = winningRev(metadata);
  
          if (isDeleted(metadata, change.doc._rev)) {
            change.deleted = true;
          }
          if (opts.conflicts) {
            change.doc._conflicts = collectConflicts(metadata.rev_tree);
          }
  
          // Dedupe the changes feed
          var changeId = change.id, changeIdIndex = resultIndices[changeId];
          if (changeIdIndex !== undefined) {
            results[changeIdIndex] = null;
          }
          results.push(change);
          resultIndices[changeId] = results.length - 1;
          cursor['continue']();
        };
      };
  
      function onTxnComplete() {
        dedupResults.map(function(c) {
          if (opts.filter && !opts.filter.apply(this, [c.doc])) {
            return;
          }
          if (!opts.include_docs) {
            delete c.doc;
          }
          call(opts.onChange, c);
        });
        call(opts.complete, null, {results: dedupResults});
      };
  
      function onerror(error) {
        if (opts.continuous) {
          IdbPouch.Changes.addListener(name, id, opts);
        }
        call(opts.complete);
      };
  
      if (opts.continuous) {
        return {
          cancel: function() {
            if (Pouch.DEBUG)
              console.log(name + ': Cancel Changes Feed');
            opts.cancelled = true;
            IdbPouch.Changes.removeListener(name, id);
          }
        }
      }
    };
  
    api.replicate = {};
  
    api.replicate.from = function idb_replicate_from(url, opts, callback) {
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      return Pouch.replicate(url, api, opts, callback);
    };
  
    api.replicate.to = function idb_replicate_to(dbName, opts, callback) {
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      return Pouch.replicate(api, dbName, opts, callback);
    };
  
    // Functions for reading and writing an attachment in the html5 file system
    // instead of idb
    function toArray(list) {
      return Array.prototype.slice.call(list || [], 0);
    }
    function fileErrorHandler(e) {
      console.error('File system error',e);
    }
  
    //Delete attachments that are no longer referenced by any existing documents
    function deleteOrphanedFiles(currentQuota){
      api.allDocs({include_docs:true},function(err, response) {
        window.requestFileSystem(window.PERSISTENT, currentQuota, function(fs){
        var dirReader = fs.root.createReader();
        var entries = [];
        var docRows = response.rows;
  
        // Call the reader.readEntries() until no more results are returned.
        var readEntries = function() {
          dirReader.readEntries (function(results) {
            if (!results.length) {
              for (var i in entries){
                var entryIsReferenced = false;
                for (var k in docRows){
                  if (docRows[k].doc){
                    var aDoc = docRows[k].doc;
                    if (aDoc._attachments) {
                      for (var j in aDoc._attachments) {
                        if (aDoc._attachments[j].digest==entries[i].name) {
                          entryIsReferenced = true;
                        }
                      };
                    }
                    if (entryIsReferenced) break;
                  }
                };
                if (!entryIsReferenced){
                  entries[i].remove(function() {
                    if (Pouch.DEBUG)
                      console.log("Removed orphaned attachment: "+entries[i].name);
                  }, fileErrorHandler);
                }
              };
            } else {
              entries = entries.concat(toArray(results));
              readEntries();
            }
          }, fileErrorHandler);
        };
  
        readEntries(); // Start reading dirs.
  
        }, fileErrorHandler);
      });
    }
  
    function writeAttachmentToFile(digest, data, type){
      //Check the current file quota and increase it if necessary
      window.storageInfo.queryUsageAndQuota(window.PERSISTENT, function(currentUsage, currentQuota) {
        var newQuota = currentQuota;
        if (currentQuota == 0){
          newQuota = 1000*1024*1024; //start with 1GB
        }else if ((currentUsage/currentQuota) > 0.8){
          deleteOrphanedFiles(currentQuota); //delete old attachments when we hit 80% usage
        }else if ((currentUsage/currentQuota) > 0.9){
          newQuota=2*currentQuota; //double the quota when we hit 90% usage
        }
  
        if (Pouch.DEBUG)
          console.log("Current file quota: "+currentQuota+", current usage:"+currentUsage+", new quota will be: "+newQuota);
  
        //Ask for file quota. This does nothing if the proper quota size has already been granted.
        window.storageInfo.requestQuota(window.PERSISTENT, newQuota, function(grantedBytes) {
          window.storageInfo.queryUsageAndQuota(window.PERSISTENT, function(currentUsage, currentQuota) {
            window.requestFileSystem(window.PERSISTENT, currentQuota, function(fs){
              fs.root.getFile(digest, {create: true}, function(fileEntry) {
                fileEntry.createWriter(function(fileWriter) {
                  fileWriter.onwriteend = function(e) {
                    if (Pouch.DEBUG)
                      console.log('Wrote attachment');
                  };
                  fileWriter.onerror = function(e) {
                    console.error('File write failed: ' + e.toString());
                  };
                  var blob = new Blob([data], {type: type});
                  fileWriter.write(blob);
                }, fileErrorHandler);
              }, fileErrorHandler);
            }, fileErrorHandler);
          }, fileErrorHandler);
        }, fileErrorHandler);
      },fileErrorHandler);
    }
  
    function readAttachmentFromFile(digest, callback){
      window.storageInfo.queryUsageAndQuota(window.PERSISTENT, function(currentUsage, currentQuota) {
        window.requestFileSystem(window.PERSISTENT, currentQuota, function(fs){
          fs.root.getFile(digest, {}, function(fileEntry) {
            fileEntry.file(function(file) {
              var reader = new FileReader();
              reader.onloadend = function(e) {
                data = this.result;
                if (Pouch.DEBUG)
                  console.log("Read attachment");
                callback(data);
              };
              reader.readAsBinaryString(file);
            }, fileErrorHandler);
          }, fileErrorHandler);
        }, fileErrorHandler);
      }, fileErrorHandler);
    }
  
    api.close = function(callback) {
      if (idb === null) {
        return call(callback, Pouch.Errors.NOT_OPEN);
      }
  
      // https://developer.mozilla.org/en-US/docs/IndexedDB/IDBDatabase#close
      // "Returns immediately and closes the connection in a separate thread..."
      idb.close();
      call(callback, null);
    };
  
    return api;
  };
  
  IdbPouch.valid = function idb_valid() {
    if (!document.location.host) {
      console.error('indexedDB cannot be used in pages served from the filesystem');
    }
    return !!window.indexedDB && !!document.location.host;
  };
  
  IdbPouch.destroy = function idb_destroy(name, callback) {
    if (Pouch.DEBUG)
      console.log(name + ': Delete Database');
    //delete the db id from localStorage so it doesn't get reused.
    delete localStorage[name+"_id"];
    IdbPouch.Changes.clearListeners(name);
    var req = indexedDB.deleteDatabase(name);
  
    req.onsuccess = function() {
      call(callback, null);
    };
  
    req.onerror = idbError(callback);
  };
  
  IdbPouch.Changes = (function() {
  
    var api = {};
    var listeners = {};
  
    api.addListener = function(db, id, opts) {
      if (!listeners[db]) {
        listeners[db] = {};
      }
      listeners[db][id] = opts;
    }
  
    api.removeListener = function(db, id) {
      delete listeners[db][id];
    }
  
    api.clearListeners = function(db) {
      delete listeners[db];
    }
  
    api.emitChange = function(db, change) {
      if (!listeners[db]) {
        return;
      }
      for (var i in listeners[db]) {
        var opts = listeners[db][i];
        if (opts.filter && !opts.filter.apply(this, [change.doc])) {
          return;
        }
        if (!opts.include_docs) {
          delete change.doc;
        }
        opts.onChange.apply(opts.onChange, [change]);
      }
    }
  
    return api;
  })();
  
  Pouch.adapter('idb', IdbPouch);
  
  "use strict";
  
  function quote(str) {
    return "'" + str + "'";
  }
  
  var POUCH_VERSION = 1;
  var POUCH_SIZE = 5 * 1024 * 1024;
  
  // The object stores created for each database
  // DOC_STORE stores the document meta data, its revision history and state
  var DOC_STORE = quote('document-store');
  // BY_SEQ_STORE stores a particular version of a document, keyed by its
  // sequence id
  var BY_SEQ_STORE = quote('by-sequence');
  // Where we store attachments
  var ATTACH_STORE = quote('attach-store');
  var META_STORE = quote('metadata-store');
  
  var unknownError = function(callback) {
    return function(event) {
      call(callback, {
        status: 500,
        error: event.type,
        reason: event.target
      });
    };
  };
  
  var webSqlPouch = function(opts, callback) {
  
    var api = {};
    var update_seq = 0;
    var name = opts.name;
  
    var db = openDatabase(name, POUCH_VERSION, name, POUCH_SIZE);
    if (!db) {
      return call(callback, Pouch.Errors.UNKNOWN_ERROR);
    }
  
    function dbCreated() {
      callback(null, api);
    }
  
    db.transaction(function (tx) {
      var meta = 'CREATE TABLE IF NOT EXISTS ' + META_STORE +
        ' (update_seq)';
      var attach = 'CREATE TABLE IF NOT EXISTS ' + ATTACH_STORE +
        ' (digest, json)';
      var doc = 'CREATE TABLE IF NOT EXISTS ' + DOC_STORE +
        ' (id unique, seq, json)';
      var seq = 'CREATE TABLE IF NOT EXISTS ' + BY_SEQ_STORE +
        ' (seq INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, rev UNIQUE, json)';
  
      tx.executeSql(attach);
      tx.executeSql(doc);
      tx.executeSql(seq);
      tx.executeSql(meta);
  
      var sql = 'SELECT update_seq FROM ' + META_STORE;
      tx.executeSql(sql, [], function(tx, result) {
        if (!result.rows.length) {
          var initSeq = 'INSERT INTO ' + META_STORE + ' (update_seq) VALUES (?)';
          tx.executeSql(initSeq, [0]);
          return;
        }
        update_seq = result.rows[0].update_seq;
      });
    }, unknownError(callback), dbCreated);
  
    api.type = function() {
      return 'websql';
    };
  
    api.id = function() {
      var id = localJSON.get(name + '_id', null);
      if (id === null) {
        id = Math.uuid();
        localJSON.set(name + '_id', id);
      }
      return id;
    };
  
    api.info = function(callback) {
      db.transaction(function(tx) {
        var sql = 'SELECT COUNT(id) AS count FROM ' + DOC_STORE;
        tx.executeSql(sql, [], function(tx, result) {
          callback(null, {
            db_name: name,
            doc_count: result.rows.item(0).count,
            update_seq: update_seq
          });
        });
      });
    };
  
    api.bulkDocs = function idb_bulkDocs(req, opts, callback) {
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      if (!opts) {
        opts = {};
      }
  
      if (!req.docs) {
        return call(callback, Pouch.Errors.MISSING_BULK_DOCS);
      }
  
      var newEdits = 'new_edits' in opts ? opts.new_edits : true;
      var userDocs = JSON.parse(JSON.stringify(req.docs));
  
      // Parse the docs, give them a sequence number for the result
      var docInfos = userDocs.map(function(doc, i) {
        var newDoc = parseDoc(doc, newEdits);
        newDoc._bulk_seq = i;
        if (doc._deleted) {
          if (!newDoc.metadata.deletions) {
            newDoc.metadata.deletions = {};
          }
          newDoc.metadata.deletions[doc._rev.split('-')[1]] = true;
        }
        return newDoc;
      });
  
      var tx;
      var results = [];
      var docs = [];
      var fetchedDocs = {};
  
      // Group multiple edits to the same document
      docInfos.forEach(function(docInfo) {
        if (docInfo.error) {
          return results.push(docInfo);
        }
        if (!docs.length || docInfo.metadata.id !== docs[0].metadata.id) {
          return docs.unshift(docInfo);
        }
        // We mark subsequent bulk docs with a duplicate id as conflicts
        results.push(makeErr(Pouch.Errors.REV_CONFLICT, docInfo._bulk_seq));
      });
  
      function sortByBulkSeq(a, b) {
        return a._bulk_seq - b._bulk_seq;
      }
  
      function complete(event) {
        var aresults = [];
        results.sort(sortByBulkSeq);
        results.forEach(function(result) {
          delete result._bulk_seq;
          if (result.error) {
            aresults.push(result);
            return;
          }
          var metadata = result.metadata;
          var rev = winningRev(metadata);
  
          aresults.push({
            ok: true,
            id: metadata.id,
            rev: rev
          });
  
          if (/_local/.test(metadata.id)) {
            return;
          }
  
          var change = {
            id: metadata.id,
            seq: metadata.seq,
            changes: collectLeaves(metadata.rev_tree),
            doc: result.data
          };
          change.doc._rev = rev;
          update_seq++;
          var sql = 'UPDATE ' + META_STORE + ' SET update_seq=?';
          tx.executeSql(sql, [update_seq], function() {
            webSqlPouch.Changes.emitChange(name, change);
          });
        });
        call(callback, null, aresults);
      }
  
      function writeDoc(docInfo, callback, isUpdate) {
        var err = null;
        var recv = 0;
  
        docInfo.data._id = docInfo.metadata.id;
        docInfo.data._rev = docInfo.metadata.rev;
  
        if (isDeleted(docInfo.metadata, docInfo.metadata.rev)) {
          docInfo.data._deleted = true;
        }
  
        var attachments = docInfo.data._attachments ?
          Object.keys(docInfo.data._attachments) : [];
  
        for (var key in docInfo.data._attachments) {
          if (!docInfo.data._attachments[key].stub) {
            var data = docInfo.data._attachments[key].data;
            var digest = 'md5-' + Crypto.MD5(data);
            delete docInfo.data._attachments[key].data;
            docInfo.data._attachments[key].digest = digest;
            saveAttachment(docInfo, digest, data, function(err) {
              recv++;
              collectResults(err);
            });
          } else {
            recv++;
            collectResults();
          }
        }
  
        if (!attachments.length) {
          finish();
        }
  
        function collectResults(attachmentErr) {
          if (!err) {
            if (attachmentErr) {
              err = attachmentErr;
              call(callback, err);
            } else if (recv == attachments.length) {
              finish();
            }
          }
        }
  
        function dataWritten(tx, result) {
          var seq = docInfo.metadata.seq = result.insertId;
          delete docInfo.metadata.rev;
          var sql = isUpdate ?
            'UPDATE ' + DOC_STORE + ' SET seq=?, json=? WHERE id=?' :
            'INSERT INTO ' + DOC_STORE + ' (id, seq, json) VALUES (?, ?, ?);';
          var params = isUpdate ?
            [seq, JSON.stringify(docInfo.metadata), docInfo.metadata.id] :
            [docInfo.metadata.id, seq, JSON.stringify(docInfo.metadata)];
          tx.executeSql(sql, params, function(tx, result) {
            results.push(docInfo);
            call(callback, null);
          });
        }
  
        function finish() {
          var data = docInfo.data;
          var sql = 'INSERT INTO ' + BY_SEQ_STORE + ' (rev, json) VALUES (?, ?);';
          tx.executeSql(sql, [data._rev, JSON.stringify(data)], dataWritten);
        }
      }
  
      function updateDoc(oldDoc, docInfo) {
        var merged = Pouch.merge(oldDoc.rev_tree, docInfo.metadata.rev_tree[0], 1000);
        var inConflict = (isDeleted(oldDoc) && isDeleted(docInfo.metadata)) ||
          (!isDeleted(oldDoc) && newEdits && merged.conflicts !== 'new_leaf');
  
        if (inConflict) {
          results.push(makeErr(Pouch.Errors.REV_CONFLICT, docInfo._bulk_seq));
          return processDocs();
        }
  
        docInfo.metadata.rev_tree = merged.tree;
        writeDoc(docInfo, processDocs, true);
      }
  
      function insertDoc(docInfo) {
        // Cant insert new deleted documents
        if ('was_delete' in opts && isDeleted(docInfo.metadata)) {
          results.push(Pouch.Errors.MISSING_DOC);
          return processDocs();
        }
        writeDoc(docInfo, processDocs, false);
      }
  
      function processDocs() {
        if (!docs.length) {
          return complete();
        }
        var currentDoc = docs.shift();
        var id = currentDoc.metadata.id;
        if (id in fetchedDocs) {
          updateDoc(fetchedDocs[id], currentDoc);
        } else {
          insertDoc(currentDoc);
        }
      }
  
      // Insert sequence number into the error so we can sort later
      function makeErr(err, seq) {
        err._bulk_seq = seq;
        return err;
      }
  
      function saveAttachment(docInfo, digest, data, callback) {
        var ref = [docInfo.metadata.id, docInfo.metadata.rev].join('@');
        var newAtt = {digest: digest, body: data};
        var sql = 'SELECT * FROM ' + ATTACH_STORE + ' WHERE digest=?';
        tx.executeSql(sql, [digest], function(tx, result) {
          if (!result.rows.length) {
            newAtt.refs = {};
            newAtt.refs[ref] = true;
            sql = 'INSERT INTO ' + ATTACH_STORE + '(digest, json) VALUES (?, ?)';
            tx.executeSql(sql, [digest, JSON.stringify(newAtt)], function() {
              call(callback, null);
            });
          } else {
            newAtt.refs = JSON.parse(result.rows.item(0).json).refs;
            sql = 'UPDATE ' + ATTACH_STORE + ' SET json=? WHERE digest=?';
            tx.executeSql(sql, [JSON.stringify(newAtt), digest], function() {
              call(callback, null);
            });
          }
        });
      }
  
      function metadataFetched(tx, results) {
        for (var j=0; j<results.rows.length; j++) {
          var row = results.rows.item(j);
          fetchedDocs[row.id] = JSON.parse(row.json);
        }
        processDocs();
      }
  
      db.transaction(function(txn) {
        tx = txn;
        var ids = '(' + docs.map(function(d) {
          return quote(d.metadata.id);
        }).join(',') + ')';
        var sql = 'SELECT * FROM ' + DOC_STORE + ' WHERE id IN ' + ids;
        tx.executeSql(sql, [], metadataFetched);
      }, unknownError(callback));
    };
  
    api.put = function(doc, opts, callback) {
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      if (!doc || !('_id' in doc)) {
        return call(callback, Pouch.Errors.MISSING_ID);
      }
      return api.bulkDocs({docs: [doc]}, opts, yankError(callback));
    };
  
    api.post = function idb_put(doc, opts, callback) {
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      return api.bulkDocs({docs: [doc]}, opts, yankError(callback));
    };
  
    api.revsDiff = function idb_revsDiff(req, opts, callback) {
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      var ids = Object.keys(req);
      var count = 0;
      var missing = {};
  
      function readDoc(err, doc, id) {
        req[id].map(function(revId) {
          var matches = function(x) { return x.rev !== revId; };
          if (!doc || doc._revs_info.every(matches)) {
            if (!missing[id]) {
              missing[id] = {missing: []};
            }
            missing[id].missing.push(revId);
          }
        });
  
        if (++count === ids.length) {
          return call(callback, null, missing);
        }
      }
  
      ids.map(function(id) {
        api.get(id, {revs_info: true}, function(err, doc) {
          readDoc(err, doc, id);
        });
      });
    };
  
    api.remove = function idb_remove(doc, opts, callback) {
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      opts.was_delete = true;
      var newDoc = JSON.parse(JSON.stringify(doc));
      newDoc._deleted = true;
      return api.bulkDocs({docs: [newDoc]}, opts, yankError(callback));
    };
  
    api.get = function(id, opts, callback) {
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
  
      id = parseDocId(id);
      if (id.attachmentId !== '') {
        return api.getAttachment(id, {decode: true}, callback);
      }
  
      var result;
      db.transaction(function(tx) {
        var sql = 'SELECT * FROM ' + DOC_STORE + ' WHERE id=?';
        tx.executeSql(sql, [id.docId], function(tx, results) {
          if (!results.rows.length) {
            result = Pouch.Errors.MISSING_DOC;
            return;
          }
          var metadata = JSON.parse(results.rows.item(0).json);
          if (isDeleted(metadata, opts.rev) && !opts.rev) {
            result = Pouch.Errors.MISSING_DOC;
            return;
          }
  
          var rev = winningRev(metadata);
          var key = opts.rev ? opts.rev : rev;
          var sql = 'SELECT * FROM ' + BY_SEQ_STORE + ' WHERE rev=?';
          tx.executeSql(sql, [key], function(tx, results) {
            var doc = JSON.parse(results.rows.item(0).json);
  
            if (opts.revs) {
              var path = arrayFirst(rootToLeaf(metadata.rev_tree), function(arr) {
                return arr.ids.indexOf(doc._rev.split('-')[1]) !== -1;
              });
              path.ids.reverse();
              doc._revisions = {
                start: (path.pos + path.ids.length) - 1,
                ids: path.ids
              };
            }
            if (opts.revs_info) {
              doc._revs_info = metadata.rev_tree.reduce(function(prev, current) {
                return prev.concat(collectRevs(current));
              }, []);
            }
            if (opts.conflicts) {
              var conflicts = collectConflicts(metadata.rev_tree);
              if (conflicts.length) {
                doc._conflicts = conflicts;
              }
            }
  
            if (opts.attachments && doc._attachments) {
              var attachments = Object.keys(doc._attachments);
              var recv = 0;
              attachments.forEach(function(key) {
                api.getAttachment(doc._id + '/' + key, {txn: tx}, function(err, data) {
                  doc._attachments[key].data = data;
                  if (++recv === attachments.length) {
                    result = doc;
                  }
                });
              });
            } else {
              if (doc._attachments){
                for (var key in doc._attachments) {
                  doc._attachments[key].stub = true;
                }
              }
              result = doc;
            }
          });
        });
      }, unknownError(callback), function() {
        if ('error' in result) {
          call(callback, result);
        } else {
          call(callback, null, result);
        }
      });
    };
  
    api.allDocs = function(opts, callback) {
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
  
      var results = [];
      var start = 'startkey' in opts ? opts.startkey : false;
      var end = 'endkey' in opts ? opts.endkey : false;
      var descending = 'descending' in opts ? opts.descending : false;
      var sql = 'SELECT ' + DOC_STORE + '.id, ' + BY_SEQ_STORE + '.seq, ' +
        BY_SEQ_STORE + '.json AS data, ' + DOC_STORE + '.json AS metadata FROM ' +
        BY_SEQ_STORE + ' JOIN ' + DOC_STORE + ' ON ' + BY_SEQ_STORE + '.seq = ' +
        DOC_STORE + '.seq';
  
      if (start) {
        sql += ' WHERE ' + DOC_STORE + '.id >= "' + start + '"';
      }
      if (end) {
        sql += (start ? ' AND ' : ' WHERE ') + DOC_STORE + '.id <= "' + end + '"';
      }
  
      sql += ' ORDER BY ' + DOC_STORE + '.id ' + (descending ? 'DESC' : 'ASC');
  
      db.transaction(function(tx) {
        tx.executeSql(sql, [], function(tx, result) {
          for (var i = 0, l = result.rows.length; i < l; i++ ) {
            var doc = result.rows.item(i);
            var metadata = JSON.parse(doc.metadata);
            var data = JSON.parse(doc.data);
            if (!(/_local/.test(metadata.id) || isDeleted(metadata))) {
              var doc = {
                id: metadata.id,
                key: metadata.id,
                value: {rev: winningRev(metadata)}
              };
              if (opts.include_docs) {
                doc.doc = data;
                doc.doc._rev = winningRev(metadata);
                if (opts.conflicts) {
                  doc.doc._conflicts = collectConflicts(metadata.rev_tree);
                }
              }
              results.push(doc);
            }
          }
        });
      }, unknownError(callback), function() {
        call(callback, null, {
          total_rows: results.length,
          rows: results
        });
      });
    }
  
    api.changes = function idb_changes(opts, callback) {
  
      if (typeof opts === 'function') {
        opts = {complete: opts};
      }
      if (callback) {
        opts.complete = callback;
      }
      if (!opts.seq) {
        opts.seq = 0;
      }
      if (opts.since) {
        opts.seq = opts.since;
      }
  
      if (Pouch.DEBUG)
        console.log(name + ': Start Changes Feed: continuous=' + opts.continuous);
  
      var descending = 'descending' in opts ? opts.descending : false;
      descending = descending ? 'prev' : null;
  
      var results = [], resultIndices = {}, dedupResults = [];
      var id = name + ':' + Math.uuid();
      var txn;
  
      if (opts.filter && typeof opts.filter === 'string') {
        var filterName = opts.filter.split('/');
        api.get('_design/' + filterName[0], function(err, ddoc) {
          var filter = eval('(function() { return ' +
                            ddoc.filters[filterName[1]] + ' })()');
          opts.filter = filter;
          fetchChanges();
        });
      } else {
        fetchChanges();
      }
  
      function fetchChanges() {
        var sql = 'SELECT ' + DOC_STORE + '.id, ' + BY_SEQ_STORE + '.seq, ' +
          BY_SEQ_STORE + '.json AS data, ' + DOC_STORE + '.json AS metadata FROM ' +
          BY_SEQ_STORE + ' JOIN ' + DOC_STORE + ' ON ' + BY_SEQ_STORE + '.seq = ' +
          DOC_STORE + '.seq WHERE ' + BY_SEQ_STORE + '.seq > ' + opts.seq +
          ' ORDER BY ' + BY_SEQ_STORE + '.seq ' + (descending ? 'DESC' : 'ASC');
  
        db.transaction(function(tx) {
          tx.executeSql(sql, [], function(tx, result) {
            for (var i = 0, l = result.rows.length; i < l; i++ ) {
              var doc = result.rows.item(i);
              var metadata = JSON.parse(doc.metadata);
              if (!/_local/.test(metadata.id)) {
                var change = {
                  id: metadata.id,
                  seq: doc.seq,
                  changes: collectLeaves(metadata.rev_tree),
                  doc: JSON.parse(doc.data),
                };
                change.doc._rev = winningRev(metadata);
                if (isDeleted(metadata, change.doc._rev)) {
                  change.deleted = true;
                }
                if (opts.conflicts) {
                  change.doc._conflicts = collectConflicts(metadata.rev_tree);
                }
                results.push(change);
              }
            }
            for (var i = 0, l = results.length; i < l; i++ ) {
              var result = results[i];
              if (result) dedupResults.push(result);
            }
            dedupResults.map(function(c) {
              if (opts.filter && !opts.filter.apply(this, [c.doc])) {
                return;
              }
              if (!opts.include_docs) {
                delete c.doc;
              }
              call(opts.onChange, c);
            });
            call(opts.complete, null, {results: dedupResults});
  
            if (opts.continuous && !opts.cancelled) {
              webSqlPouch.Changes.addListener(name, id, opts);
            }
          });
        });
      }
  
      if (opts.continuous) {
        return {
          cancel: function() {
            if (Pouch.DEBUG)
              console.log(name + ': Cancel Changes Feed');
            opts.cancelled = true;
            webSqlPouch.Changes.removeListener(name, id);
          }
        }
      }
    };
  
    api.getAttachment = function(id, opts, callback) {
      if (opts instanceof Function) {
        callback = opts;
        opts = {};
      }
      if (typeof id === 'string') {
        id = parseDocId(id);
      }
  
      var res;
      // This can be called while we are in a current transaction, pass the context
      // along and dont wait for the transaction to complete here.
      if ('txn' in opts) {
        fetchAttachment(opts.txn);
      } else {
        db.transaction(fetchAttachment, unknownError(callback), function() {
          call(callback, null, res);
        });
      }
  
      function postProcessDoc(data) {
        if (opts.decode) {
          return atob(data);
        }
        return data;
      }
  
      function fetchAttachment(tx) {
        var sql = 'SELECT ' + BY_SEQ_STORE + '.json AS data FROM ' + DOC_STORE +
          ' JOIN ' + BY_SEQ_STORE + ' ON ' + BY_SEQ_STORE + '.seq = ' + DOC_STORE +
          '.seq WHERE ' + DOC_STORE + '.id = "' + id.docId + '"' ;
        tx.executeSql(sql, [], function(tx, result) {
          var doc = JSON.parse(result.rows.item(0).data);
          var attachment = doc._attachments[id.attachmentId];
          var digest = attachment.digest;
          var type = attachment.content_type;
          var sql = 'SELECT * FROM ' + ATTACH_STORE + ' WHERE digest=?';
          tx.executeSql(sql, [digest], function(tx, result) {
            var data = JSON.parse(result.rows.item(0).json).body;
            res = postProcessDoc(data);
            if ('txn' in opts) {
              call(callback, null, res);
            }
          });
        });
      }
    }
  
    // Everything below this are not dependant on the storage implementation
    // and can be shared between the adapters instead of reimplemented in each
    api.putAttachment = function idb_putAttachment(id, rev, doc, type, callback) {
      id = parseDocId(id);
      api.get(id.docId, {attachments: true}, function(err, obj) {
        obj._attachments || (obj._attachments = {});
        obj._attachments[id.attachmentId] = {
          content_type: type,
          data: btoa(doc)
        }
        api.put(obj, callback);
      });
    };
  
    api.removeAttachment = function idb_removeAttachment(id, rev, callback) {
      id = parseDocId(id);
      api.get(id.docId, function(err, obj) {
        if (err) {
          call(callback, err);
          return;
        }
  
        if (obj._rev != rev) {
          call(callback, Pouch.Errors.REV_CONFLICT);
          return;
        }
  
        obj._attachments || (obj._attachments = {});
        delete obj._attachments[id.attachmentId];
        api.put(obj, callback);
      });
    };
  
    api.replicate = {};
  
    api.replicate.from = function idb_replicate_from(url, opts, callback) {
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      return Pouch.replicate(url, api, opts, callback);
    };
  
    api.replicate.to = function idb_replicate_to(dbName, opts, callback) {
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
      return Pouch.replicate(api, dbName, opts, callback);
    };
  }
  
  webSqlPouch.valid = function() {
    return !!window.openDatabase;
  };
  
  webSqlPouch.destroy = function(name, callback) {
    var db = openDatabase(name, POUCH_VERSION, name, POUCH_SIZE);
    db.transaction(function (tx) {
      tx.executeSql('DROP TABLE IF EXISTS ' + DOC_STORE, []);
      tx.executeSql('DROP TABLE IF EXISTS ' + BY_SEQ_STORE, []);
      tx.executeSql('DROP TABLE IF EXISTS ' + ATTACH_STORE, []);
    }, unknownError(callback), function() {
      callback(null);
    });
  };
  
  
  // This is shared exactly with the idb adapter, extract into utils
  webSqlPouch.Changes = (function() {
  
    var api = {};
    var listeners = {};
  
    api.addListener = function(db, id, opts) {
      if (!listeners[db]) {
        listeners[db] = {};
      }
      listeners[db][id] = opts;
    }
  
    api.removeListener = function(db, id) {
      delete listeners[db][id];
    }
  
    api.clearListeners = function(db) {
      delete listeners[db];
    }
  
    api.emitChange = function(db, change) {
      if (!listeners[db]) {
        return;
      }
      for (var i in listeners[db]) {
        var opts = listeners[db][i];
        if (opts.filter && !opts.filter.apply(this, [change.doc])) {
          return;
        }
        if (!opts.include_docs) {
          delete change.doc;
        }
        opts.onChange.apply(opts.onChange, [change]);
      }
    }
  
    return api;
  })();
  
  Pouch.adapter('websql', webSqlPouch);
  /*global Pouch: true */
  
  "use strict";
  
  // This is the first implementation of a basic plugin, we register the
  // plugin object with pouch and it is mixin'd to each database created
  // (regardless of adapter), adapters can override plugins by providing
  // their own implementation. functions on the plugin object that start
  // with _ are reserved function that are called by pouchdb for special
  // notifications.
  
  // If we wanted to store incremental views we can do it here by listening
  // to the changes feed (keeping track of our last update_seq between page loads)
  // and storing the result of the map function (possibly using the upcoming
  // extracted adapter functions)
  
  var MapReduce = function(db) {
  
    function viewQuery(fun, options) {
      if (!options.complete) {
        return;
      }
  
      function sum(values) {
        return values.reduce(function(a, b) { return a + b; }, 0);
      }
  
      var results = [];
      var current = null;
  
      var emit = function(key, val) {
        var viewRow = {
          id: current._id,
          key: key,
          value: val
        };
        if (options.include_docs) {
          viewRow.doc = current.doc;
        }
        if (options.startkey && Pouch.collate(key, options.startkey) < 0) return;
        if (options.endkey && Pouch.collate(key, options.endkey) > 0) return;
        if (options.key && Pouch.collate(key, options.key) != 0) return;
        results.push(viewRow);
      };
  
      // ugly way to make sure references to 'emit' in map/reduce bind to the
      // above emit
      eval('fun.map = ' + fun.map.toString() + ';');
      if (fun.reduce) {
        eval('fun.reduce = ' + fun.reduce.toString() + ';');
      }
  
      db.changes({
        include_docs: true,
        onChange: function(doc) {
          if (!('deleted' in doc)) {
            current = {doc: doc.doc};
            fun.map.call(this, doc.doc);
          }
        },
        complete: function() {
          results.sort(function(a, b) {
            return Pouch.collate(a.key, b.key);
          });
          if (options.descending) {
            results.reverse();
          }
          if (options.reduce === false) {
            return options.complete(null, {rows: results});
          }
  
          var groups = [];
          results.forEach(function(e) {
            var last = groups[groups.length-1] || null;
            if (last && Pouch.collate(last.key[0][0], e.key) === 0) {
              last.key.push([e.key, e.id]);
              last.value.push(e.value);
              return;
            }
            groups.push({key: [[e.key, e.id]], value: [e.value]});
          });
          groups.forEach(function(e) {
            e.value = fun.reduce(e.key, e.value) || null;
            e.key = e.key[0][0];
          });
          options.complete(null, {rows: groups});
        }
      });
    };
  
    function httpQuery(fun, opts, callback) {
  
      // List of parameters to add to the PUT request
      var params = [];
  
      // If opts.reduce exists and is defined, then add it to the list
      // of parameters.
      // If reduce=false then the results are that of only the map function
      // not the final result of map and reduce.
      if (typeof opts.reduce !== 'undefined') {
        params.push('reduce=' + opts.reduce);
      }
      if (typeof opts.include_docs !== 'undefined') {
        params.push('include_docs=' + opts.include_docs);
      }
      if (typeof opts.limit !== 'undefined') {
        params.push('limit=' + opts.limit);
      }
      if (typeof opts.descending !== 'undefined') {
        params.push('descending=' + opts.descending);
      }
      if (typeof opts.startkey !== 'undefined') {
        params.push('startkey=' + encodeURIComponent(JSON.stringify(opts.startkey)));
      }
      if (typeof opts.endkey !== 'undefined') {
        params.push('endkey=' + encodeURIComponent(JSON.stringify(opts.endkey)));
      }
      if (typeof opts.key !== 'undefined') {
        params.push('key=' + encodeURIComponent(JSON.stringify(opts.key)));
      }
  
      // Format the list of parameters into a valid URI query string
      params = params.join('&');
      params = params === '' ? '' : '?' + params;
  
      // We are referencing a query defined in the design doc
      if (typeof fun === 'string') {
        var parts = fun.split('/');
        db.request({
          type:'GET',
          url: '_design/' + parts[0] + '/_view/' + parts[1] + params,
        }, callback);
        return;
      }
  
      // We are using a temporary view, terrible for performance but good for testing
      var queryObject = JSON.stringify(fun, function(key, val) {
        if (typeof val === 'function') {
          return val + ''; // implicitly `toString` it
        }
        return val;
      });
  
      db.request({
        type:'POST',
        url: '_temp_view' + params,
        data: queryObject
      }, callback);
    };
  
    function query(fun, opts, callback) {
      if (typeof opts === 'function') {
        callback = opts;
        opts = {};
      }
  
      if (callback) {
        opts.complete = callback;
      }
  
      if (db.type() === 'http') {
        return httpQuery(fun, opts, callback);
      }
  
      if (typeof fun === 'object') {
        return viewQuery(fun, opts);
      }
  
      var parts = fun.split('/');
      db.get('_design/' + parts[0], function(err, doc) {
        if (err) {
          if (callback) callback(err);
          return;
        }
        viewQuery({
          map: doc.views[parts[1]].map,
          reduce: doc.views[parts[1]].reduce
        }, opts);
      });
    }
  
    return {'query': query};
  };
  
  // Deletion is a noop since we dont store the results of the view
  MapReduce._delete = function() { }
  
  Pouch.plugin('mapreduce', MapReduce);
  