text: 'use strict';
  
  // SQLite3: Column Builder & Compiler
  // -------
  module.exports = function(client) {
  
  var _        = require('lodash');
  var inherits = require('inherits');
  var Schema   = require('../../../schema');
  
  // Table Builder
  // -------
  
  function TableBuilder_SQLite3() {
    this.client = client;
    Schema.TableBuilder.apply(this, arguments);
  }
  inherits(TableBuilder_SQLite3, Schema.TableBuilder);
  
  // Table Compiler
  // -------
  
  function TableCompiler_SQLite3() {
    this.client = client;
    this.Formatter = client.Formatter;
    this.SQLite3_DDL = client.SQLite3_DDL;
    this.primaryKey = void 0;
    Schema.TableCompiler.apply(this, arguments);
  }
  inherits(TableCompiler_SQLite3, Schema.TableCompiler);
  
  // Create a new table.
  TableCompiler_SQLite3.prototype.createQuery = function(columns, ifNot) {
    var createStatement = ifNot ? 'create table if not exists ' : 'create table ';
    var sql = createStatement + this.tableName() + ' (' + columns.sql.join(', ');
  
    // SQLite forces primary keys to be added when the table is initially created
    // so we will need to check for a primary key commands and add the columns
    // to the table's declaration here so they can be created on the tables.
    sql += this.foreignKeys() || '';
    sql += this.primaryKeys() || '';
    sql += ')';
  
    this.pushQuery(sql);
  };
  
  TableCompiler_SQLite3.prototype.addColumns = function(columns) {
    for (var i = 0, l = columns.sql.length; i < l; i++) {
      this.pushQuery({
        sql: 'alter table ' + this.tableName() + ' add column ' + columns.sql[i],
        bindings: columns.bindings[i]
      });
    }
  };
  
  // Compile a drop unique key command.
  TableCompiler_SQLite3.prototype.dropUnique = function(columns, indexName) {
    indexName = indexName || this._indexCommand('unique', this.tableNameRaw, columns);
    this.pushQuery('drop index ' + indexName);
  };
  
  TableCompiler_SQLite3.prototype.dropIndex = function(columns, indexName) {
    indexName = indexName || this._indexCommand('index', this.tableNameRaw, columns);
    this.pushQuery('drop index ' + indexName);
  };
  
  // Compile a unique key command.
  TableCompiler_SQLite3.prototype.unique = function(columns, indexName) {
    indexName = indexName || this._indexCommand('unique', this.tableNameRaw, columns);
    columns = this.formatter.columnize(columns);
    this.pushQuery('create unique index ' + indexName + ' on ' + this.tableName() + ' (' + columns + ')');
  };
  
  // Compile a plain index key command.
  TableCompiler_SQLite3.prototype.index = function(columns, indexName) {
    indexName = indexName || this._indexCommand('index', this.tableNameRaw, columns);
    columns = this.formatter.columnize(columns);
    this.pushQuery('create index ' + indexName + ' on ' + this.tableName() + ' (' + columns + ')');
  };
  
  TableCompiler_SQLite3.prototype.primary =
  TableCompiler_SQLite3.prototype.foreign = function() {
    if (this.method !== 'create' && this.method !== 'createIfNot') {
      console.warn('SQLite3 Foreign & Primary keys may only be added on create');
    }
  };
  
  TableCompiler_SQLite3.prototype.primaryKeys = function() {
    var pks = _.where(this.grouped.alterTable || [], {method: 'primary'});
    if (pks.length > 0 && pks[0].args.length > 0) {
      var args = _.isArray(pks[0].args[0]) ? pks[0].args[0] : pks[0].args;
      return ', primary key (' + this.formatter.columnize(args) + ')';
    }
  };
  
  TableCompiler_SQLite3.prototype.foreignKeys = function() {
    var sql = '';
    var foreignKeys = _.where(this.grouped.alterTable || [], {method: 'foreign'});
    for (var i = 0, l = foreignKeys.length; i < l; i++) {
      var foreign       = foreignKeys[i].args[0];
      var column        = this.formatter.columnize(foreign.column);
      var references    = this.formatter.columnize(foreign.references);
      var foreignTable  = this.formatter.wrap(foreign.inTable);
      sql += ', foreign key(' + column + ') references ' + foreignTable + '(' + references + ')';
      if (foreign.onDelete) sql += ' on delete ' + foreign.onDelete;
      if (foreign.onUpdate) sql += ' on update ' + foreign.onUpdate;
    }
    return sql;
  };
  
  TableCompiler_SQLite3.prototype.createTableBlock = function() {
    return this.getColumns().concat().join(',');
  };
  
  // Compile a rename column command... very complex in sqlite
  TableCompiler_SQLite3.prototype.renameColumn = function(from, to) {
    var compiler = this;
    this.pushQuery({
      sql: 'PRAGMA table_info(' + this.tableName() + ')',
      output: function(pragma) {
        return new compiler.SQLite3_DDL(this, compiler, pragma).renameColumn(from, to);
      }
    });
  };
  
  TableCompiler_SQLite3.prototype.dropColumn = function(column) {
    var compiler = this;
    this.pushQuery({
      sql: 'PRAGMA table_info(' + this.tableName() + ')',
      output: function(pragma) {
        return new compiler.SQLite3_DDL(this, compiler, pragma).dropColumn(column);
      }
    });
  };
  
  client.TableBuilder = TableBuilder_SQLite3;
  client.TableCompiler = TableCompiler_SQLite3;
  
  };
  