(function(Pitaya, window) {

  "use strict";

  // Load dependencies
  var path = require('path');
  var fs = require('fs');
  var Handlebars = require('handlebars');
  var cp = require("child_process");
  var gui = require('nw.gui');
  var minimist = require('minimist');

  // Load templates
  var itemsListTpl = Handlebars.compile(Pitaya.DOM.select('#items-list-tpl').innerHTML);

  // Internal constants
  var DEFAULT_PROFILE = './default-profile.json';

  /**
   * Start the app
   *
   * @param rootEl The application root element selector
   * @return Pitaya
   */
  Pitaya.start = function(rootEl) {

    Pitaya._opts = minimist(gui.App.argv);
    Pitaya._rootEl = Pitaya.DOM.select(rootEl);
    Pitaya._initListeners();

    var profilePath = Pitaya._opts.profile || DEFAULT_PROFILE;

    return Pitaya.loadProfile(profilePath)
      .then(function() {
        return Pitaya;
      })
    ;

  };

  /**
   * Load a profile file and render the application
   *
   * @param profilePath The path of the profile file
   * @return Promise
   */
  Pitaya.loadProfile = function(profilePath) {
    return Pitaya._loadJSONFile(profilePath)
      .then(function(profile) {
        Pitaya._profile = profile;
        Pitaya.render();
        return profile;
      })
    ;
  };

  /**
   * Update the application view
   *
   * @return Pitaya
   */
  Pitaya.render = function() {
    var rootEl = Pitaya._rootEl;
    var profile = Pitaya._profile;
    rootEl.innerHTML = itemsListTpl(profile);
  };


  /**
   * Initialize DOM event listeners
   * @private
   */
  Pitaya._initListeners = function() {
    var rootEl = Pitaya._rootEl;
    rootEl.addEventListener('click', Pitaya._onItemClick);
  };

  /**
   * App item click handler
   * @private
   */
  Pitaya._onItemClick = function(evt) {

    var appItemEl = evt.srcElement.matches( '.app-item') ? evt.srcElement :
      Pitaya.DOM.getClosestAncestor(evt.srcElement, '.app-item')
    ;

    if( !appItemEl ) return;

    var execPath = appItemEl.dataset.exec;

    console.info('Launching application "'+execPath+'"...');

    if(execPath) {
      appItemEl.classList.add('loading');
      cp.exec(execPath, function(err) {
        appItemEl.classList.remove('loading');
        if(err) return console.error(err.stack || err);
        console.info('Application closed "'+execPath+'".');
      });
    }

  };

  /**
   * Load a JSON file
   *
   * @private
   * @param filePath The path of the json file
   * @return Promise
   */
  Pitaya._loadJSONFile = function(filePath) {
    return new Promise(function(resolve, reject) {
      fs.readFile(filePath, 'utf8', function(err, fileContent) {
        if(err) return reject(err);
        try {
          var json = JSON.parse(fileContent);
          return resolve(json);
        } catch(err) {
          return reject(err);
        }
      });
    });
  };

}(window.Pitaya = window.Pitaya || {}, window));