'use strict';

/**
 * Licensed Materials - Property of IBM
 *
 * IBM Cognos Products: Dashboard
 *
 * Copyright IBM Corp. 2015, 2020
 *
 * US Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
 */
define(['jquery', 'underscore', '../../lib/@waca/core-client/js/core-client/ui/core/View', 'text!./templates/DataSourcePanel.html', '../nls/StringResources', '../../DynamicFileLoader', '../../lib/@waca/core-client/js/core-client/utils/BidiUtil', '../../lib/@waca/core-client/js/core-client/utils/BrowserUtils'], function ($, _, BaseView, template, resources, DynamicFileLoader, BidiUtil, BrowserUtils) {
	'use strict';

	var DataSourcePanel = BaseView.extend({
		templateString: template,

		events: {
			'primaryaction .backButton ': 'goBack'
		},

		init: function init() {
			var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};

			DataSourcePanel.inherited('init', this, arguments);

			$.extend(this, options);

			this.slideout = options.slideout;
			this.dashboardView = options.glassContext.appController.getCurrentContentView();

			this.initialize();

			// Indicate that this view must be reloaded when the dashboard view is reloaded
			// because we depend on the datasource service
			this.dashboardView.addReloadableObject(this.viewId, this);

			this._cachedControllers = [];
		},

		initialize: function initialize() {
			this.dashboardApi = this.dashboardView.getDashboardApi();
			this.currentView = null;
			this.viewEntries = [];
			this.iconsFeature = this.dashboardApi.getFeature('Icons');
			this._setupEvents();
			this._setupPostRelinkHandler();
		},

		_setupPostRelinkHandler: function _setupPostRelinkHandler() {
			this.relinkHandler = this.dashboardApi.getFeature('.LifeCycleManager').registerLifeCycleHandler('post:relink', this._onRelink.bind(this));
		},
		_onRelink: function _onRelink() {
			this._cachedControllers = [];
		},


		reload: function reload() {
			this.initialize();
			if (this.isRendered) {
				this.render();
			}
		},

		_setupEvents: function _setupEvents() {
			this.registeredEvents = [];
			var dataSourcesSvc = this.dashboardApi.getFeature('dataSources.deprecated');
			this.dataSourceCollection = dataSourcesSvc.getSourcesCollection();
			this.registeredEvents.push(this.dashboardApi.on('widget:selected', this.handleWidgetSelection.bind(this)));
			this.registeredEvents.push(this.dashboardApi.on('dataSourceGrid:dataSourceSelected', this.showMetadataTree.bind(this)));
			this.registeredEvents.push(this.dashboardApi.on('dataSourcePanel:dataSourceAdded', this.handleDataSourceAddedByUser.bind(this)));
			this.registeredEvents.push(this.dashboardApi.on('dataSourceGrid:clearSourceSelected', this.clearGridSourceSelection.bind(this)));
		},

		render: function render() {
			this.isRendered = true;
			// We will hide the slideout default pin button
			this.slideout.$el.addClass('sidepane');
			this.$el.empty();
			this.$el.addClass('datasetPanel');
			var dataSourceIcon = this.iconsFeature.getIcon('common-data_source');
			var previousIcon = this.iconsFeature.getIcon('common-previous');
			var sHtml = this.dotTemplate({
				dataSourceIcon: dataSourceIcon.id,
				previousIcon: previousIcon.id,
				goBackLabel: resources.get('backLabel')
			});
			this.$el.append(sHtml);
			this._$dataSourceHeaderTitle = this.$('.datasetHeader .title');
			this._$typeIcon = this.$('.datasetHeader .typeIcon');
			this._$backButton = this.$('.datasetHeader .backButton');
			this.showView(this._getViewOptions(), undefined, true);
		},

		setTransientState: function setTransientState(name, value) {
			this.dashboardView.setTransientState(name, value);
		},

		getTransientState: function getTransientState(name) {
			return this.dashboardView.getTransientState(name);
		},

		getDataSourceListOptions: function getDataSourceListOptions() {
			return {
				id: 'dataSourceList',
				title: resources.get('sourcePaneLabel'),
				module: 'dashboard-analytics/dataSources/views/DataSourceList'
			};
		},

		remove: function remove() {
			this.dashboardView.removeReloadableObject(this.viewId, this);

			if (this.registeredEvents.length) {
				_.each(this.registeredEvents, function (collectionEvent) {
					if (collectionEvent) {
						collectionEvent.remove();
					}
				});
				this.registeredEvents.length = 0;
			}

			for (var i = 0; i < this.viewEntries.length; i += 1) {
				var _cachedView = this.viewEntries[i]._cachedView;
				if (_cachedView) {
					_cachedView.remove();
					this.viewEntries[i]._cachedView = null;
				}
			}

			this.viewEntries.length = 0;
			this._cachedControllers.length = 0;
			this.slideout = null;
			this.dashboardView = null;
			this.dashboardApi = null;
			this.iconsFeature = null;
			this.dataSourceCollection = null;
			this.relinkHandler && this.relinkHandler.remove();
			this.relinkHandler = null;
			DataSourcePanel.inherited('remove', this, arguments);
		},

		showView: function showView(options, preventRender) {
			var setFocus = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;

			if (options.forceRefreshMetadata) {
				// Return when the current view is not metadata panel
				if (this.currentView && !this.currentView.back) {
					return;
				} else {
					this._removeViewEntry({
						id: options.id
					});
				}
			}

			//Save the state of the pane
			this.setTransientState(this._getStateName(), $.extend({}, options));

			if (!options.id) {
				options.id = options.title;
			}

			var viewEntry = this._findViewEntry(options);
			if (viewEntry) {
				this._enableCachedView(viewEntry, preventRender, setFocus);
				return;
			}

			// Add common attributes to the view options
			options.panelController = this;
			options.dashboardApi = this.dashboardApi;

			var registerView = function (view) {
				options._cachedView = view;
				this.viewEntries.push(options);
				this._enableCachedView(options, undefined, setFocus);
			}.bind(this);

			if (this._viewInstance) {
				registerView(this._viewInstance);
			} else {
				DynamicFileLoader.load([options.module]).then(function (modules) {

					var view = new modules[0](options);
					registerView(view);
				}.bind(this));
			}
		},

		/**
   * Goes back and shows the previous view
   * @param preventRender  When true the view will not be rendered
   */
		goBack: function goBack(preventRender) {
			if (this.currentView && this.currentView.back) {
				this.showView(this.currentView.back, preventRender);
				this.currSourceId = null;
			}
		},

		clearIcons: function clearIcons() {
			this.$('.datasetHeader .icons').empty();
		},

		addIcon: function addIcon($icon, handler) {
			var $button = $('<div class="ds_btn" tabindex="0" role="button"></div>');
			$button.attr('aria-labelledby', $icon.attr('id'));
			$button.append($icon);
			$button.on('primaryaction', handler);
			this.$('.datasetHeader .icons').append($button);
		},

		renderDataSourcePaneButtons: function renderDataSourcePaneButtons(collectionId) {
			return this.dashboardApi.findGlassCollection(collectionId).then(function (buttonsCollection) {
				if (buttonsCollection) {
					buttonsCollection.sort(function (a, b) {
						return (a.weight || 0) - (b.weight || 0);
					});
					buttonsCollection.forEach(function (buttonDefinition) {
						this._renderDataSourceButton(buttonDefinition);
					}.bind(this));
				}
			}.bind(this));
		},

		_renderDataSourceButton: function _renderDataSourceButton(buttonDefinition) {
			var id = this.viewId + buttonDefinition.name;
			var icon = {};
			var buttonIcon = buttonDefinition.icon;
			if (buttonIcon.indexOf('add-new') !== -1) {
				icon = this.iconsFeature.getIcon('addNew');
			} else if (buttonIcon.indexOf('menuoverflow') !== -1) {
				icon = this.iconsFeature.getIcon('overflowMenuHorizontal32');
			} else if (buttonIcon.indexOf('warning') !== -1 || buttonIcon.indexOf('error') !== -1) {
				icon = this.iconsFeature.getIcon('common-warning');
			}
			var btnSVG = this._getSVGIcon(icon.id);
			var $addBtn = $('<div class="addIcon" id="' + id + '">' + btnSVG + '</div>');
			//Add Source Button
			var label = buttonDefinition.label;
			$addBtn.attr('title', label);
			$addBtn.attr('aria-label', label);
			this.addIcon($addBtn, this.executeAction.bind(this, buttonDefinition));
		},

		renderSelectSourceButton: function renderSelectSourceButton(buttonDefinition) {
			var id = this.viewId + buttonDefinition.name;
			var label = buttonDefinition.label;
			var $button = $('<button type="button" role="button" id="s' + id + '" class="selectSourceButton">' + label + '</button>');
			$button.attr('title', label);
			$button.attr('aria-label', label);
			$button.on('primaryaction', this.executeAction.bind(this, buttonDefinition));
			return $button;
		},

		executeAction: function executeAction(buttonDefinition, evt) {
			var actionController = buttonDefinition.actionController;
			if (!actionController) {
				return;
			}

			if (buttonDefinition.name && this._cachedControllers[buttonDefinition.name]) {
				this._cachedControllers[buttonDefinition.name].execute(evt, buttonDefinition);
			} else {
				require([actionController], function (ActionController) {
					var controller = new ActionController({
						dashboardApi: this.dashboardApi,
						dataSourcePanel: this
					});
					if (buttonDefinition.name) {
						this._cachedControllers[buttonDefinition.name] = controller;
					}
					controller.execute(evt, buttonDefinition);
				}.bind(this));
			}
		},

		setFocus: function setFocus() {
			//This is being handled by the sub-view.
		},

		/*
   * Private Methods
   */
		_getViewOptions: function _getViewOptions() {
			// check if there is an active data source set in explore view, if yes we want to show metadata tree of this data source
			var activeSourceId = this.dashboardApi.getActiveDataSourceId();
			var options = this.getTransientState(this._getStateName());
			if (activeSourceId) {
				if (!options || !options.dataSource || options.dataSource.getId() !== activeSourceId) {
					if (!options) {
						// options is null when we render the datasource panel for the first time, mark 'dataSourceListRendered' state to true so that when DataSourceList.render() is called for goBack,
						// it doesn't try to load the metadata
						this.setTransientState('dataSourceListRendered', true);
					}
					options = this._getActiveDataSourceOptions(activeSourceId);
				}
			}
			if (!options) {
				options = this.getDataSourceListOptions();
			}
			return options;
		},

		_getActiveDataSourceOptions: function _getActiveDataSourceOptions(activeSourceId) {
			var dataSource = this.dataSourceCollection.getSource(activeSourceId);
			var name = dataSource.getName();
			var options = {
				id: dataSource.getId(),
				module: 'dashboard-analytics/dataSources/views/Metadata',
				dataSource: dataSource,
				back: this.getDataSourceListOptions(),
				title: name,
				dataSourceName: name
			};
			return options;
		},

		_getStateName: function _getStateName() {
			return 'dataSourcePaneState';
		},

		_enableCachedView: function _enableCachedView(viewEntry, preventRender) {
			var setFocus = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;

			//Toggle elements which are only visible in one view.
			this._$backButton.toggle(!!viewEntry.back);
			this._$typeIcon.toggle(!!viewEntry.back);
			this.setTypeIcon(viewEntry.dataSource);

			var isIE = BrowserUtils.isIE();
			if (this.currentView && this.currentView._cachedView) {
				if (isIE) {
					this.currentView._cachedView.hide();
				} else {
					this.currentView._cachedView.detach();
				}
			}
			this.clearIcons();

			if (viewEntry.title) {
				this._$dataSourceHeaderTitle.text(viewEntry.title);
				this._$dataSourceHeaderTitle.attr('title', viewEntry.title);
				this._$dataSourceHeaderTitle.attr('aria-label', viewEntry.title);
				this._$dataSourceHeaderTitle.attr('dir', BidiUtil.resolveBaseTextDir(viewEntry.title));
			}

			if (!viewEntry._cachedView) return;

			if (isIE && viewEntry._cachedView && viewEntry._cachedView.$el.parent().length !== 0) {
				viewEntry._cachedView.$el.show();
			} else {
				this.$('.datasetContent').append(viewEntry._cachedView.$el);
			}

			//currentView needs to be set before the cached view is rendered.  This is so that user
			//can still return to data source list pane in case of error since the view will always be partially rendered with
			//'go back' button.
			this.currentView = viewEntry;
			this.currentView && this.currentView._cachedView && this.currentView._cachedView.show({ forceRefreshMetadata: viewEntry.forceRefreshMetadata, preventRender: preventRender, setFocus: setFocus });
		},

		setTypeIcon: function setTypeIcon(dataSource) {
			var dataSourceIcon = this.iconsFeature.getIcon('common-data_source');
			var typeIcon = this._getSVGIcon(dataSourceIcon.id);
			if (dataSource) {
				//These rules should match those in templates/DataSourceItem.html
				var state = dataSource.getState(),
				    type = dataSource.getType();

				if (state === 'loading') {
					typeIcon = '<svg class="loader--small"><circle class="loader__path" cx="12.35px" cy="12.35px" r="6px"></circle></svg>';
				} else if (type === 'module') {
					var modelIcon = this.iconsFeature.getIcon('common-titan-model');
					typeIcon = this._getSVGIcon(modelIcon.id);
				} else if (type === 'uploadedFile') {
					var uploadIcon = this.iconsFeature.getIcon('common-upload');
					typeIcon = this._getSVGIcon(uploadIcon.id);
				} else {
					var dataSetIcon = this.iconsFeature.getIcon('common-dataset');
					typeIcon = this._getSVGIcon(dataSetIcon.id);
				}
			}
			this._$typeIcon.html(typeIcon);
		},

		_getSVGIcon: function _getSVGIcon(SVGIconId) {
			return SVGIconId && '<svg class="svgIcon"><use xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#' + SVGIconId + '"></use></svg>';
		},

		_findViewEntry: function _findViewEntry(options) {
			return _.find(this.viewEntries, function (viewEntry) {
				return options.id === viewEntry.id;
			});
		},

		_removeViewEntry: function _removeViewEntry(options) {
			var entry = _.findWhere(this.viewEntries, {
				id: options.id
			});

			if (entry && entry._cachedView) {
				entry._cachedView.remove();
			}

			this.viewEntries = _.without(this.viewEntries, entry);
		},

		/**
   * Override Gemini base behavior
   */
		_hideDataSourcePanel: function _hideDataSourcePanel() {
			// Empty method.
		},

		loadMetadata: function loadMetadata(dataSource) {
			var forceRefreshMetadata = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
			var setFocus = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;

			dataSource.getLocalizedName().then(function (name) {
				this.currSourceId = dataSource.getId();
				this.showView({
					id: dataSource.getId(),
					dataSourceName: name,
					module: 'dashboard-analytics/dataSources/views/Metadata',
					dataSource: dataSource,
					back: this.getDataSourceListOptions(),
					forceRefreshMetadata: forceRefreshMetadata,
					title: name
				}, undefined, setFocus);
			}.bind(this));
		},

		handleDataSourceAddedByUser: function handleDataSourceAddedByUser(event) {
			if (event.sender && this.dataSourceCollection) {
				this.dashboardApi.triggerDashboardEvent('dataSourcePanel:dataSourceSelected', {
					sender: event.sender
				});

				this.showMetadataTree(event, true);
			}
		},

		showMetadataTree: function showMetadataTree(event) {
			var setFocus = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;

			if (typeof setFocus !== 'boolean') {
				setFocus = false;
			}
			if (event.sender && this.dataSourceCollection) {
				this.loadMetadata(this.dataSourceCollection.getSource(event.sender), false, setFocus);
			}
		},

		/**
  *		Clear the UI selection from the metadata tree
  */
		clearGridSourceSelection: function clearGridSourceSelection() {
			if (this.dataSourceCollection) {
				var $items = this.$el.find('.bi-common-treeItem');
				$items.removeClass('is-selected');
			}
		},

		handleWidgetSelection: function handleWidgetSelection(event) {
			if (event.sender && this.dataSourceCollection) {
				var sourceId = this.dataSourceCollection.usesSource(event.sender);
				if (sourceId && this.currSourceId !== sourceId) {
					var source = this.dataSourceCollection.getSource(sourceId);
					if (source.getState() !== 'error') {
						//Don't attempt to show a tree for a source in an error state.
						this.currSourceId = sourceId;
						this.loadMetadata(source);
					}
				}
			}
		}
	});
	return DataSourcePanel;
});
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