const logLevel    = !args['v'] || args['v'] === true ? 0 : parseInt(args['v']);
  const chalk       = new Chalk.constructor({enabled: useColor});
  const nameLength  = args['format-name-length'] || 25;

  class Logger{
    constructor(name='', _stdout=stdout, _stderr=stderr){
      this._name = this._getPaddedName(name);
      this._stdout = _stdout;
      this._stderr = _stderr;
      this.error.bind(this);
      this.info.bind(this);
      this.warn.bind(this);
    }
    error(level, ...args){
      if(level <= logLevel){
        this._print(this._stderr, args, 'red', level);
      }
    }
    info(level, ...args){
      if(level <= logLevel){
        this._print(this._stdout, args, 'blue', level);
      }
    }
    warn(level, ...args){
      if(level <= logLevel){
        this._print(this._stderr, args, 'yellow', level);
      }
    }
    _getLogId(color, level){
      return chalk[color](
        moment().format("YYYY:MM:DD h:mm:ss")
        + ` ${this._name}`
        + ` [${level}]: `
      );
    }
    _getPaddedName(name){
      let nameArray = name.split('')
        .slice(0, nameLength);
      if(nameLength > name.length){
        nameArray = nameArray
          .concat(new Array(nameLength - name.length).fill(null));
      }
      let ellipsis = nameArray.slice(nameLength - 3)
        .reduce((prev, next)=>!!(prev || next), false);
      return nameArray
        .slice(0, nameLength - 3)
        .map(char=>char || '-')
        .concat(ellipsis ? ['.', '.', '.'] : ['-', '-', '-'])
        .join('');
    }
    _format(arg, color, level){
      let logId = this._getLogId(color, level);
      return util.format(arg)
        .replace(/^/, logId)
        .replace(/(r?n)/g, `n${logId}`)
        .replace(/((?:r?n)?$)/, 'n');
    }
    _print(stream, args, color, level){
      args.forEach(arg=>{
        if(arg !== ''){
          stream.write(this._format(arg, color, level));
        }
      });
    }
  }

  let defaultLogger = new Logger('logger');

  Logger.error = defaultLogger.error.bind(defaultLogger);
  Logger.info = defaultLogger.info.bind(defaultLogger);
  Logger.warn = defaultLogger.warn.bind(defaultLogger);

  return Logger;