'use strict';
  var _ = require('lodash');
  var readlineFacade = require('readline2');
  
  
  /**
   * Base interface class other can inherits from
   */
  
  var UI = module.exports = function (opt) {
    // Instantiate the Readline interface
    // @Note: Don't reassign if already present (allow test to override the Stream)
    if (!this.rl) {
      this.rl = readlineFacade.createInterface(_.extend({
        terminal: true
      }, opt));
    }
    this.rl.resume();
  
    this.onForceClose = this.onForceClose.bind(this);
  
    // Make sure new prompt start on a newline when closing
    this.rl.on('SIGINT', this.onForceClose);
    process.on('exit', this.onForceClose);
  };
  
  
  /**
   * Handle the ^C exit
   * @return {null}
   */
  
  UI.prototype.onForceClose = function () {
    this.close();
    console.log('
  '); // Line return
  };
  
  
  /**
   * Close the interface and cleanup listeners
   */
  
  UI.prototype.close = function () {
    // Remove events listeners
    this.rl.removeListener('SIGINT', this.onForceClose);
    process.removeListener('exit', this.onForceClose);
  
    // Restore prompt functionnalities
    this.rl.output.unmute();
  
    // Close the readline
    this.rl.output.end();
    this.rl.pause();
    this.rl.close();
    this.rl = null;
  };