'use strict';

var Raw = require('./raw');
var warn = require('./helpers').warn;
var Client = require('./client');

var makeClient = require('./util/make-client');
var makeKnex = require('./util/make-knex');
var parseConnection = require('./util/parse-connection');
var assign = require('lodash/object/assign');

function Knex(config) {
  if (typeof config === 'string') {
    return new Knex(assign(parseConnection(config), arguments[2]));
  }
  var Dialect;
  if (arguments.length === 0 || !config.client && !config.dialect) {
    Dialect = makeClient(Client);
  } else {
    var clientName = config.client || config.dialect;
    Dialect = makeClient(require('./dialects/' + (aliases[clientName] || clientName) + '/index.js'));
  }
  if (typeof config.connection === 'string') {
    config = assign({}, config, { connection: parseConnection(config.connection).connection });
  }
  return makeKnex(new Dialect(config));
}

// Expose Client on the main Knex namespace.
Knex.Client = Client;

// Run a "raw" query, though we can't do anything with it other than put
// it in a query statement.
Knex.raw = function (sql, bindings) {
  return new Raw({}).set(sql, bindings);
};

// Create a new "knex" instance with the appropriate configured client.
Knex.initialize = function (config) {
  warn('knex.initialize is deprecated, pass your config object directly to the knex module');
  return new Knex(config);
};

// Bluebird
Knex.Promise = require('./promise');

// The client names we'll allow in the `{name: lib}` pairing.
var aliases = {
  'mariadb': 'maria',
  'mariasql': 'maria',
  'pg': 'postgres',
  'postgresql': 'postgres',
  'sqlite': 'sqlite3'
};

// Doing this ensures Browserify works. Still need to figure out
// the best way to do some of this.
if (process.browser) {
  require('./dialects/websql/index.js');
}

module.exports = Knex;