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