"use strict";
/**
 * Copyright (c) 2010-2017 Brian Carlson (brian.m.carlson@gmail.com)
 * All rights reserved.
 *
 * This source code is licensed under the MIT license found in the
 * README.md file in the root directory of this source tree.
 */

var EventEmitter = require('events').EventEmitter;
var util = require('util');
var Client = require('./client');
var defaults =  require('./defaults');
var Connection = require('./connection');
var ConnectionParameters = require('./connection-parameters');
var Pool = require('pg-pool');

const poolFactory = (Client) => {
  var BoundPool = function(options) {
    var config = { Client: Client };
    for (var key in options) {
      config[key] = options[key];
    }
    return new Pool(config)
  };

  util.inherits(BoundPool, Pool);

  return BoundPool;
};


var PG = function(clientConstructor) {
  this.defaults = defaults;
  this.Client = clientConstructor;
  this.Query = this.Client.Query;
  this.Pool = poolFactory(this.Client);
  this._pools = [];
  this.Connection = Connection;
  this.types = require('pg-types');
};

if(typeof process.env.NODE_PG_FORCE_NATIVE != 'undefined') {
  module.exports = new PG(require('./native'));
} else {
  module.exports = new PG(Client);

  //lazy require native module...the native module may not have installed
  module.exports.__defineGetter__("native", function() {
    delete module.exports.native;
    var native = null;
    try {
      native = new PG(require('./native'));
    } catch (err) {
      if (err.code !== 'MODULE_NOT_FOUND') {
        throw err;
      }
      console.error(err.message);
    }
    module.exports.native = native;
    return native;
  });
}