Construct

index.js

'use strict';

/**
 * This notation was generated by templates.
 * // -------------------------------------------------
 * @description Universal database factory
 * @file index.js
 * @author: Anton Myrberg <anton> 2018-02-26T11:10:55+01:00
 * // -------------------------------------------------
 * Make sure this file is part of its proper namespace
 * and project before moving on.
 * // -------------------------------------------------
 * Code-tags conventionally should be used (See below) :
 * TODO - Something that someone need to do.
 * DOING - Self remind for what you are doing.
 * CONSIDER - Reminder to consider a change or addition.
 * BUG - The below section of a code cause a bug.
 * FIXME - The below section of code need to be fixed.
 * HACK - The below section of code is a workaround.
 * XXX - Any notation important enough to consider implementing.
 * CLARIFY - Very incomprehensible section of code below.
 *
 * Created by Anton Myrberg <anton>  2018-02-26T11:10:55+01:00
 * Last modified by Anton Myrberg <anton>  2018-02-26T11:10:55+01:00
 *
 */

/**
* @description
* 
* DOING: Should add node_modules and files required
* to separate them from the rest.
*/
const Sequelize = require('sequelize');
const Mongoose = require('mongoose');

/**
* @description
* 
* DOING: Should add librarires and files required
* to separate them from the rest.
*/
const language = require('./lib/locale/default');

/**
 * @description
 *
 * DOING: Should return boolean of
 * whether instance is truthy.
 * @returns {Boolean}
 */
const isConstruct = (instance, construct) => (!!instance instanceof construct);

/**
 * @description
 * 
 * DOING: Should return the default
 * handler to the callee.
 * 
 * @returns {Object|Function|*}
 */
const defaultHandler = Mongoose;

/**
 * @function databaseFactory
 * 
 * @description
 * 
 * DOING: Should export the correct factory as
 * to the callee as a factory object.
 * 
 * @param {Object} config
 * @param {Object} instance
 * @returns {Object|Function|Promise|*}
 */
module.exports = config => instance => {

  /**
   * @description
   * 
   * DOING: Should return a factory global
   * instance of the SuperClass prototype. 
   */
  const Db = new SuperDatabase(config.construct);


  const factory = {

    /**
     * @method 
     * 
     * @description
     * 
     * DOING: Should return a construct
     * of the sequelize module as a new instance.
     */
    'superdb-someMethod' : () => {
      return Db.someMethod();
    },


    /**
     * @method sequelize
     * 
     * @description
     * 
     * DOING: Should return a construct
     * of the sequelize module as a new instance.
     */
    'sequelize' : () => {
      const { database, user, pass, extraConf } = config.config;
      const db = new Sequelize(database, user, pass, extraConf);
      return db;
    },

    /**
     * @method mongoose
     * 
     * @description
     * 
     * DOING: Should return a construct
     * of the mongoose module as a new Promise instance.
     * 
     * @returns {Object|Promise.<void>}
     */
    'mongoose' : () => new Promise((resolve, reject) => {

      /**
       * @description
       * 
       * CLARIFY: Should connect to the proper
       * MongoDB instance from the passed configuration
       * 
       * @returns {Object|Function|*}
       */
      const connectionObj = Mongoose.createConnection(`${config.config.host}${config.config.database}`);

      connectionObj.on('open', () => {
        var Model = connectionObj.model(config.config.model, config.config.schema);
        var returnModel = new Model({});
        return resolve(returnModel);
      });
      connectionObj.on('error', (e) => {
        return reject(language.ERROR_CONNECTING, error);
      })
      
    })

  };
    return factory[config.handler];
};