const commandLineArgs = require('command-line-args')  
  , logger = require("logops");

class Config {

  constructor() {
    this.options = {}
    // this.requires = ['env', 'gateway', 'quix24', 'mongo']
    this.requires = ['env']
    this.init()
    this.validate()
    this.finalize()
  }

  init() {
    try {
      this.options = commandLineArgs([
        { name: 'env', alias: 'e', type: String, defaultValue: ['production'] },
        { name: 'host', type: String },
        { name: 'port', type: Number },
        { name: 'database', alias: 'd', type: String },
        { name: 'username', alias: 'u', type: String },
        { name: 'password', alias: 'p', type: String },
        { name: 'mongo', alias: 'm', type: String },
        { name: 'redis', alias: 'r', type: String },
        { name: 'level', alias: 'l', type: String },
        { name: 'gateway', alias: 'g', type: String },
        { name: 'quix24', alias: 'q', type: String }
      ]);
    } catch (e) {
      logger.debug('Command line arguments interpret failed :', e.message)
      logger.debug('expected arguments : ', JSON.stringify(this.requires))
      process.exit(1)
    }
  }

  finalize() {
    if (this.options.env == 'development') {
      this.options.level = this.options.level ? this.options.level : "DEBUG"
      logger.formatters.dev.omit = ['pid', 'port', 'hostname', 'app'];
      // logger.format = logger.formatters.dev;
    } else {
      this.options.level = this.options.level ? this.options.level : "WARN"
    }    
    logger.formatters.json.omit = ['pid', 'port', 'hostname', 'app'];
    logger.setLevel(this.options.level)
    logger.debug(this.options, 'Environment setting options')
  }

  validate() {
    for (let key in this.options) {
      if (this.options[key]) {
        delete this.requires[this.requires.indexOf(key)]
      }
    }
    this.requires = this.requires.filter(function (el) {
      return el != null;
    })
    if (this.requires.length) {
      logger.debug('Process terminated invalid required arguments: ', JSON.stringify(this.requires))
      process.exit(1)
    }
  }

}

let config = new Config;
module.exports = config.options