text: 'use strict';
  
  module.exports = function (db, module) {
  	var helpers = module.helpers.mongo;
  
  	module.flushdb = function (callback) {
  		callback = callback || helpers.noop;
  		db.dropDatabase(function (err) {
  			callback(err);
  		});
  	};
  
  	module.emptydb = function (callback) {
  		callback = callback || helpers.noop;
  		db.collection('objects').remove({}, function (err) {
  			callback(err);
  		});
  	};
  
  	module.exists = function (key, callback) {
  		if (!key) {
  			return callback();
  		}
  		db.collection('objects').findOne({ _key: key }, function (err, item) {
  			callback(err, item !== undefined && item !== null);
  		});
  	};
  
  	module.delete = function (key, callback) {
  		callback = callback || helpers.noop;
  		if (!key) {
  			return callback();
  		}
  		db.collection('objects').remove({ _key: key }, function (err) {
  			callback(err);
  		});
  	};
  
  	module.deleteAll = function (keys, callback) {
  		callback = callback || helpers.noop;
  		if (!Array.isArray(keys) || !keys.length) {
  			return callback();
  		}
  		db.collection('objects').remove({ _key: { $in: keys } }, function (err) {
  			callback(err);
  		});
  	};
  
  	module.get = function (key, callback) {
  		if (!key) {
  			return callback();
  		}
  		module.getObjectField(key, 'value', callback);
  	};
  
  	module.set = function (key, value, callback) {
  		callback = callback || helpers.noop;
  		if (!key) {
  			return callback();
  		}
  		var data = { value: value };
  		module.setObject(key, data, callback);
  	};
  
  	module.increment = function (key, callback) {
  		callback = callback || helpers.noop;
  		if (!key) {
  			return callback();
  		}
  		db.collection('objects').findAndModify({ _key: key }, {}, { $inc: { value: 1 } }, { new: true, upsert: true }, function (err, result) {
  			callback(err, result && result.value ? result.value.value : null);
  		});
  	};
  
  	module.rename = function (oldKey, newKey, callback) {
  		callback = callback || helpers.noop;
  		db.collection('objects').update({ _key: oldKey }, { $set: { _key: newKey } }, { multi: true }, function (err) {
  			callback(err);
  		});
  	};
  
  	module.expire = function (key, seconds, callback) {
  		module.expireAt(key, Math.round(Date.now() / 1000) + seconds, callback);
  	};
  
  	module.expireAt = function (key, timestamp, callback) {
  		module.setObjectField(key, 'expireAt', new Date(timestamp * 1000), callback);
  	};
  
  	module.pexpire = function (key, ms, callback) {
  		module.pexpireAt(key, Date.now() + parseInt(ms, 10), callback);
  	};
  
  	module.pexpireAt = function (key, timestamp, callback) {
  		timestamp = Math.min(timestamp, 8640000000000000);
  		module.setObjectField(key, 'expireAt', new Date(timestamp), callback);
  	};
  };
  