'use strict';

/*
 *+------------------------------------------------------------------------+
 *| Licensed Materials - Property of IBM
 *| IBM Cognos Products: Dashboard
 *| (C) Copyright IBM Corp. 2017, 2019
 *|
 *| US Government Users Restricted Rights - Use, duplication or disclosure
 *| restricted by GSA ADP Schedule Contract with IBM Corp.
 *+------------------------------------------------------------------------+
 */
define(['../../lib/@waca/core-client/js/core-client/utils/ClassFactory', '../glass/SplitPaneView'], function (ClassFactory, SplitPaneView) {

	var _canvasExtensions = {

		_ClassFactory: ClassFactory,
		_SplitPaneView: SplitPaneView,

		/**
  * @param {object} options
  * @param {object} options.services
  * @param {object} options.eventRouter
  * @param {object} options.handlers - object of handers
  * @param {object} options.topNode - top position jquery node
  * @param {object} options.bottomNode - bottom position jquery node
  * @param {object[]} options.canvasExtensions
  * @param {integer} options.canvasExtensions[].order - the order, compared to other extensions to show in the DOM
  * @param {('top'|'bottom')} options.canvasExtensions[].position - The position in the DOM to place the extension.
  * @param {string} options.canvasExtensions[].class - The view class. MUST implement render() and return a promise.
  * @param {object} options.canvasExtensions[].class.$el - the node to be placed on the DOM
  * @param {function} [options.canvasExtensions[].class.initialize] - a method which returns a promise. Will be called BEFORE class.render
  * @param {function} options.canvasExtensions[].class.render - a method which returns a promise. Will be called BEFORE attaching $el to the DOM. Operations performed on $el ahead of time must be able to be constructed detached from the DOM
  * @param {function} options.canvasExtensions[].class.remove - will be called before the DOM node is removed
  */
		init: function init(options) {
			this.dashboardApi = options.dashboardApi;
			this.topNode = options.topNode;
			this.bottomNode = options.bottomNode;
			this.canvasExtensions = options.canvasExtensions || [];
			this.services = options.services;
			this.eventRouter = options.eventRouter;
			this.appSettings = options.appSettings;
			this.handlers = options.handlers;
			this.consumeHideHandles = [];
			this.views = new Map([]);
		},
		destroy: function destroy() {
			this.views.forEach(function (value) {
				if (typeof value.remove === 'function') {
					value.remove();
				} else {
					console.warn('view.remove should be implemented');
				}
			});
			this.views = new Map([]);
			if (this.splitPaneView) {
				this.splitPaneView.remove();
			}
		},
		render: function render() {
			var promise = Promise.resolve();
			if (this.canvasExtensions.length > 0) {
				this.canvasExtensions.sort(function (a, b) {
					return a.order - b.order;
				});
				var splitterItems = [];
				this.canvasExtensions.forEach(function (extension) {
					promise = promise.then(this._ClassFactory.loadModule.bind(this._ClassFactory, extension.class)).then(function (View) {
						var _this = this;

						var options = {
							//DO NOT add any more parameters here. The appSettings, services and eventrouter is all an extension needs. if you found your way here looking to add a dependency, you're doing it wrong.
							appSettings: this.appSettings,
							services: this.services,
							eventRouter: this.eventRouter,
							dashboardApi: this.dashboardApi
						};
						if (extension.extraOptions) {
							options.extraOptions = extension.extraOptions;
						}
						var view = new View(options);

						var initializationPromise;
						if (typeof view.initialize === 'function') {
							initializationPromise = view.initialize();
						} else {
							initializationPromise = Promise.resolve();
						}

						return initializationPromise.then(function () {
							var hasApi = !!view.getApi;
							if (hasApi) {
								return _this.dashboardApi.getCanvas().registerFeature(extension.name, view.getApi());
							}
						}).then(function () {
							var promise;
							if (extension.position === 'top') {
								_this.topNode.append(view.$el);
							} else if (extension.position === 'bottom') {
								_this.bottomNode.append(view.$el);
							} else if (extension.position === 'splitter') {
								promise = view.getSplitterOpts().then(function (opts) {
									if (opts.hideInConsume) {
										this.consumeHideHandles.push(opts.handleClass);
										if (!this.handlers.isAuthorMode()) {
											opts.hidden = true;
										}
									}
									splitterItems.push(opts);
									return opts;
								}.bind(_this));
							}
							_this.views.set(extension.name, view);
							return promise || Promise.resolve();
						}).then(function () {
							var renderPromise;
							if (extension.position !== 'splitter') {
								renderPromise = view.render();
							}
							return renderPromise || Promise.resolve();
						});
					}.bind(this));
				}.bind(this));

				promise = promise.then(function () {
					if (splitterItems.length > 0) {
						return this._createSplitPaneView(splitterItems);
					}
				}.bind(this));
			}
			return promise;
		},
		_createSplitPaneView: function _createSplitPaneView(splitterItems) {
			if (!this.splitPaneView) {
				this.splitPaneView = new this._SplitPaneView({
					splitterItems: splitterItems,
					handlers: {
						getParentSize: this.handlers.getParentSize
					},
					dashboardApi: this.dashboardApi,
					services: this.services
				});
				this._setupHideHandles();
				return this.splitPaneView.render().then(function () {
					this.bottomNode.prepend(this.splitPaneView.$el.children()); //TODO shouldn't need to take the children
					return this.splitPaneView.onContainerReady();
				}.bind(this));
			}
			return Promise.resolve();
		},
		_setupHideHandles: function _setupHideHandles() {
			this.eventRouter.on('mode:change', function (payload) {
				switch (this.handlers.getSplitterState()) {
					case 'close':
						this.splitPaneView.close();
						break;
					case 'open':
						this.splitPaneView.open();
						break;
					case 'nochange':
					default:
						break;
				}
				this.consumeHideHandles.forEach(function (handle) {
					if (payload.authoring) {
						this.splitPaneView.showHandle(handle);
					} else {
						this.splitPaneView.hideHandle(handle);
					}
				}.bind(this));
			}, this);
		},
		// Used to set a persistent state for the session
		setState: function setState(state) {
			if (state.bottomNode.isOpen) {
				this.splitPaneView.open();
			} else {
				this.splitPaneView.close();
			}
		},
		// Used to get the state from the saved options object
		getState: function getState() {
			return {
				bottomNode: {
					isOpen: this.bottomNode[0].clientHeight > 0 ? true : false
				}
			};
		},

		/**
   * @param {String} name extension name
   * @returns a registered extensions
   */
		getExtension: function getExtension(name) {
			return this.views.get(name);
		}
	};

	function CanvasExtensions(options) {
		this.init(options);
	}

	Object.keys(_canvasExtensions).forEach(function (key) {
		CanvasExtensions.prototype[key] = _canvasExtensions[key];
	});

	return CanvasExtensions;
});
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