/*
   * Copyright (c) 2014
   *
   * @author Vincent Petry
   * @copyright 2014 Vincent Petry <pvince81@owncloud.com>
   *
   * This file is licensed under the Affero General Public License version 3
   * or later.
   *
   * See the COPYING-README file.
   *
   */
  
  /* global dragOptions, folderDropOptions */
  (function() {
  
  	if (!OCA.Files) {
  		OCA.Files = {};
  	}
  
  	var App = {
  		navigation: null,
  
  		initialize: function() {
  			this.navigation = new OCA.Files.Navigation($('#app-navigation'));
  
  			var fileActions = new OCA.Files.FileActions();
  			// default actions
  			fileActions.registerDefaultActions();
  			// legacy actions
  			fileActions.merge(window.FileActions);
  			// regular actions
  			fileActions.merge(OCA.Files.fileActions);
  
  			this._onActionsUpdated = _.bind(this._onActionsUpdated, this);
  			OCA.Files.fileActions.on('setDefault.app-files', this._onActionsUpdated);
  			OCA.Files.fileActions.on('registerAction.app-files', this._onActionsUpdated);
  			window.FileActions.on('setDefault.app-files', this._onActionsUpdated);
  			window.FileActions.on('registerAction.app-files', this._onActionsUpdated);
  
  			this.files = OCA.Files.Files;
  
  			// TODO: ideally these should be in a separate class / app (the embedded "all files" app)
  			this.fileList = new OCA.Files.FileList(
  				$('#app-content-files'), {
  					scrollContainer: $('#app-content'),
  					dragOptions: dragOptions,
  					folderDropOptions: folderDropOptions,
  					fileActions: fileActions,
  					allowLegacyActions: true
  				}
  			);
  			this.files.initialize();
  
  			// for backward compatibility, the global FileList will
  			// refer to the one of the "files" view
  			window.FileList = this.fileList;
  
  			this._setupEvents();
  			// trigger URL change event handlers
  			this._onPopState(OC.Util.History.parseUrlQuery());
  		},
  
  		/**
  		 * Destroy the app
  		 */
  		destroy: function() {
  			this.navigation = null;
  			this.fileList.destroy();
  			this.fileList = null;
  			this.files = null;
  			OCA.Files.fileActions.off('setDefault.app-files', this._onActionsUpdated);
  			OCA.Files.fileActions.off('registerAction.app-files', this._onActionsUpdated);
  			window.FileActions.off('setDefault.app-files', this._onActionsUpdated);
  			window.FileActions.off('registerAction.app-files', this._onActionsUpdated);
  		},
  
  		_onActionsUpdated: function(ev, newAction) {
  			// forward new action to the file list
  			if (ev.action) {
  				this.fileList.fileActions.registerAction(ev.action);
  			} else if (ev.defaultAction) {
  				this.fileList.fileActions.setDefault(
  					ev.defaultAction.mime,
  					ev.defaultAction.name
  				);
  			}
  		},
  
  		/**
  		 * Returns the container of the currently visible app.
  		 *
  		 * @return app container
  		 */
  		getCurrentAppContainer: function() {
  			return this.navigation.getActiveContainer();
  		},
  
  		/**
  		 * Sets the currently active view
  		 * @param viewId view id
  		 */
  		setActiveView: function(viewId, options) {
  			this.navigation.setActiveItem(viewId, options);
  		},
  
  		/**
  		 * Returns the view id of the currently active view
  		 * @return view id
  		 */
  		getActiveView: function() {
  			return this.navigation.getActiveItem();
  		},
  
  		/**
  		 * Setup events based on URL changes
  		 */
  		_setupEvents: function() {
  			OC.Util.History.addOnPopStateHandler(_.bind(this._onPopState, this));
  
  			// detect when app changed their current directory
  			$('#app-content').delegate('>div', 'changeDirectory', _.bind(this._onDirectoryChanged, this));
  			$('#app-content').delegate('>div', 'changeViewerMode', _.bind(this._onChangeViewerMode, this));
  
  			$('#app-navigation').on('itemChanged', _.bind(this._onNavigationChanged, this));
  		},
  
  		/**
  		 * Event handler for when the current navigation item has changed
  		 */
  		_onNavigationChanged: function(e) {
  			var params;
  			if (e && e.itemId) {
  				params = {
  					view: e.itemId,
  					dir: '/'
  				};
  				this._changeUrl(params.view, params.dir);
  				this.navigation.getActiveContainer().trigger(new $.Event('urlChanged', params));
  			}
  		},
  
  		/**
  		 * Event handler for when an app notified that its directory changed
  		 */
  		_onDirectoryChanged: function(e) {
  			if (e.dir) {
  				this._changeUrl(this.navigation.getActiveItem(), e.dir);
  			}
  		},
  
  		/**
  		 * Event handler for when an app notifies that it needs space
  		 * for viewer mode.
  		 */
  		_onChangeViewerMode: function(e) {
  			var state = !!e.viewerModeEnabled;
  			$('#app-navigation').toggleClass('hidden', state);
  			$('.app-files').toggleClass('viewer-mode no-sidebar', state);
  		},
  
  		/**
  		 * Event handler for when the URL changed
  		 */
  		_onPopState: function(params) {
  			params = _.extend({
  				dir: '/',
  				view: 'files'
  			}, params);
  			var lastId = this.navigation.getActiveItem();
  			if (!this.navigation.itemExists(params.view)) {
  				params.view = 'files';
  			}
  			this.navigation.setActiveItem(params.view, {silent: true});
  			if (lastId !== this.navigation.getActiveItem()) {
  				this.navigation.getActiveContainer().trigger(new $.Event('show'));
  			}
  			this.navigation.getActiveContainer().trigger(new $.Event('urlChanged', params));
  		},
  
  		/**
  		 * Change the URL to point to the given dir and view
  		 */
  		_changeUrl: function(view, dir) {
  			var params = {dir: dir};
  			if (view !== 'files') {
  				params.view = view;
  			}
  			OC.Util.History.pushState(params);
  		}
  	};
  	OCA.Files.App = App;
  })();
  
  $(document).ready(function() {
  	// wait for other apps/extensions to register their event handlers and file actions
  	// in the "ready" clause
  	_.defer(function() {
  		OCA.Files.App.initialize();
  	});
  });