'use strict';

/*
 * Licensed Materials - Property of IBM
 * IBM Cognos Products: Storytelling
 * (C) Copyright IBM Corp. 2017, 2020
 * US Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
 */
define(['baglass/core-client/js/core-client/ui/core/Class', 'underscore', 'gemini/dashboard/util/PxPercentUtil', './layouts/BlankSceneLayout', './layouts/SceneLayout2', './model/TimelineModel'], function (Class, _, PxPercentUtil, BlankSceneLayout, SceneLayout2, TimelineModel) {

	var StoryService = Class.extend({
		/**
   * @class
   */
		init: function init(options) {
			StoryService.inherited('init', this, arguments);
			this.dashboardApi = options.dashboardApi;
			this.hasOutOfBoundsWidget = false;
			this.hasEmptyExploreCards = false;
		},

		/**
   *
   * @param {Object} options
   * @param {Object} options.boardModel The board model to convert
   * @param {Object} [options.targetInfo]
   * @param {string} [options.targetInfo.type='slideshow']
   * @param {string} [options.targetInfo.transition=null]
   *
   * @returns {Promise} The successfully modified version of the boardModel that was passed in.
   */
		createStory: function createStory(options) {
			var _this = this;

			// setup
			this._checkOptions(options);
			this._setTargetInfo(options);

			return this._createModelObjectForStory(options.boardModel, options.sourceType).then(function (modelJson) {
				modelJson.timeline = modelJson.timeline || {};
				_this._updateLayout(modelJson.layout);

				// set the episodes from the array of widgets
				var widgets = _this._findDescendantsWithType('widget', modelJson.layout.items);
				TimelineModel.widgetsToEpisodes(modelJson.timeline, widgets, {});

				return {
					model: modelJson,
					status: {
						hasOutOfBoundsWidget: options.targetInfo.type !== 'slideshow' && _this.hasOutOfBoundsWidget,
						hasEmptyExploreCards: _this.hasEmptyExploreCards
					}
				};
			});
		},

		_findDescendantsWithType: function _findDescendantsWithType(type, items) {
			var descendants = [];
			if (items) {
				for (var i = 0; i < items.length; i++) {
					if (items[i].type === type) {
						descendants.push({
							type: 'widget',
							id: items[i].id
						});
					} else if (items[i].items) {
						descendants.push.apply(descendants, this._findDescendantsWithType(type, items[i].items));
					}
				}
			}
			return descendants;
		},

		/**
  * @param {Object} options
  * @param {Object} options.boardModel The board model to convert
  * @param {Object} [options.targetInfo]
  * @param {string} [options.targetInfo.type='slideshow']
  * @param {string} [options.targetInfo.transition=null]
  *
  * @returns {Promise}
  */
		updateStory: function updateStory(options) {
			// setup
			this._checkOptions(options);
			this._setTargetInfo(options);

			//take a copy of the board model
			var boardModelJson = JSON.parse(JSON.stringify(options.boardModel.toJSON()));

			this._convertFreeformToTemplate(boardModelJson.layout);
			this._updateLayout(boardModelJson.layout);

			var contentView = this.dashboardApi.getCurrentContentView();
			contentView.clearTransientState();
			contentView.getDashboardApi().getFeature('DashboardState').setDirty(true);
			var boardId = contentView.getBoardId() || null; //Retain the same board ID
			return contentView.reloadFromJSONSpec(boardModelJson, { boardId: boardId });
		},

		/**
   * @private
   * @param {Object} model The BoardModel spec to build off of to convert a Dashboard to a Story.
   * @param {String} sourceType
   * @returns {Promise} Returns a promise that will return a model object that holds Storytelling properties
   */
		_createModelObjectForStory: function _createModelObjectForStory(model, sourceType) {
			var _this2 = this;

			var modelJson = model.toJSON();

			return this.dashboardApi.getGlassSvc('.ConversionService').then(function (srvc) {
				return srvc.convert(sourceType.toUpperCase(), 'STORY', JSON.stringify(modelJson));
			}).then(function (spec) {
				var specJson = JSON.parse(spec);
				if (sourceType === 'explore') {
					if (modelJson.layout.items.length !== specJson.layout.length) {
						_this2.hasEmptyExploreCards = true;
					}

					var _convertExploreLayout = _this2._convertExploreLayoutToStory(specJson),
					    layout = _convertExploreLayout.layout,
					    widgets = _convertExploreLayout.widgets;

					modelJson.layout = layout;
					modelJson.widgets = _this2._convertExploreWidgetsToStory(specJson.widgets);
					// Reserve title placehodler widget(s) from Scenelayout2 template
					Object.assign(modelJson.widgets, widgets);
				} else if (sourceType === 'dashboard') {
					_this2._convertFreeformToTemplate(modelJson.layout);
				}

				return modelJson;
			}).catch(function (error) {

				if (sourceType === 'explore') {
					_this2.hasEmptyExploreCards = true;
					modelJson.layout = _this2._convertExploreLayoutToStory().layout;
					modelJson.widgets = {};
					return modelJson;
				}

				return Promise.reject(error);
			});
		},

		/**
   * Convert layout from explore to storytelling layout by using SceneLayout2 template
   * @private
   * @param {Array} layouts the converted explore spec. If there is no spec, return a layout spec with an empty scene
   * @returns return the converted storytelling layout
   */
		_convertExploreLayoutToStory: function _convertExploreLayoutToStory(spec) {
			var _this3 = this;

			var storyLayout = {
				layout: {
					items: [],
					layoutPositioning: 'relative',
					pageSize: {
						width: 1280,
						height: 720
					},
					style: {
						height: '100%'
					}
				},
				widgets: {}
			};
			if (spec && spec.layout) {
				return spec.layout.reduce(function (acc, item) {
					return _this3._convertCardToSceneLayout(acc, item, spec.widgetToCardMap);
				}, storyLayout);
			} else {
				// empty explore cards
				var blankSceneLayout = BlankSceneLayout.get().layout;
				storyLayout.layout.items.push(blankSceneLayout);
				return storyLayout;
			}
		},

		_convertCardToSceneLayout: function _convertCardToSceneLayout(acc, item, widgetToCardMap) {
			var _replaceWidget = this._replaceWidget(item, 'vis1_', SceneLayout2),
			    layout = _replaceWidget.layout,
			    widgets = _replaceWidget.widgets;
			// Reserve explore card layout id


			layout.id = widgetToCardMap[item.id];
			acc.layout.items.push(layout);
			Object.assign(acc.widgets, widgets);
			return acc;
		},

		/**
   * Replace the widget in the template with the giving item
   * @param {*} specItem Widget to replace
   * @param {*} idPrefix The prefix id of the widget that needs replacing
   * @param {*} layoutTemplate Scene layout template
   * @returns sceneLayout
   */
		_replaceWidget: function _replaceWidget(specItem, idPrefix, layoutTemplate) {
			var sceneLayout = layoutTemplate.get();
			var placehodler = sceneLayout.layout.items[0].items.find(function (item) {
				return item.id && item.id.startsWith(idPrefix);
			});
			delete sceneLayout.widgets[placehodler.id];
			// Use the style from layoutTemplate
			delete specItem.style;
			Object.assign(placehodler, specItem);

			return sceneLayout;
		},

		/**
   * Convert explore widgets array to storyteling widget object
   * Example:
   * array = [ {id: 'widget1' ...}, {id: 'widget2', ...} ]
   * returnObj = { widget1: {id: 'widget1' ...}, widget2: {id: 'widget2', ...} }
   * 
   * @param {Array} widgets converted widgets array from explore
   * @returns return a storytelling widget object
   */
		_convertExploreWidgetsToStory: function _convertExploreWidgetsToStory(widgets) {
			return widgets.reduce(function (obj, widget) {
				obj[widget.id] = widget;
				return obj;
			}, {});
		},

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

			if (!options.targetInfo) {
				options.targetInfo = {};
			}

			if (!options.boardModel) {
				throw new Error('No board model found to convert');
			}
		},

		_setTargetInfo: function _setTargetInfo(options) {
			this._targetInfo = {
				type: this._validateType(options.targetInfo.type) || 'slideshow'
			};

			// only slideshow type has a transition
			if (options.targetInfo.type === 'slideshow') {
				this._targetInfo.transition = this._validateTransition(options.targetInfo.transition) || 'none';
			}
		},

		/**
   * @private
   * @param {string} type The type of a Board Model being dealt with; dashboard, slideshow, guidedjourney, etc.
   *
   * @returns {string | null} If type is valid then it is returned otherwise null is returned
   */
		_validateType: function _validateType(type) {
			// Add other valid types to the list of cases that are acceptable
			switch (type) {
				case 'dashboard':
				case 'slideshow':
				case 'panAndZoom1':
				case 'panAndZoom2':
				case 'panAndZoom3':
				case 'panAndZoom4':
				case 'panAndZoom5':
				case 'panAndZoom6':
					return type;
				default:
					return null;
			}
		},

		/**
   * @private
   * @param {string} transition The transition type the story uses to move between scenes
   *
   * @returns {string | null} If the transition is valid then it is returned otherwise null is returned
   */
		_validateTransition: function _validateTransition(transition) {
			// Add other valid transitions to the list as more become acceptable
			switch (transition) {
				case 'none':
				case 'scaleAndSlide':
				case 'animatedPath':
					return transition;
				default:
					return null;
			}
		},

		/**
   * @private
   * @param {Object} layoutJson A JSON object
   */
		_updateLayout: function _updateLayout(layoutJson) {
			layoutJson.type = this._targetInfo.type;
			switch (this._targetInfo.type) {
				case 'dashboard':
					break;
				case 'slideshow':
					this._updateLayoutForSlideShow(layoutJson);
					break;
				case 'panAndZoom1':
				case 'panAndZoom2':
				case 'panAndZoom3':
				case 'panAndZoom4':
				case 'panAndZoom5':
				case 'panAndZoom6':
					this._updateLayoutForPanAndZoom(layoutJson);
					break;
				default:
					break;
			}
			this._fitWidgetsToScenes(layoutJson);
			return layoutJson;
		},

		_updateLayoutForSlideShow: function _updateLayoutForSlideShow(layoutJson) {
			// Step 1: remove GJ-specific properties
			layoutJson.items.forEach(function (item) {
				delete item.data;
				delete item.style;
			});

			delete layoutJson.hasOverview;
			delete layoutJson.showOverviews;

			// Step 2: set up slideshow-specific properties
			// transition defaults to 'none' when converting to slideshow
			layoutJson.transition = this._targetInfo.transition;
		},

		_updateLayoutForPanAndZoom: function _updateLayoutForPanAndZoom(layoutJson) {
			// Step 1: remove transition, if it exists (ie. SS -> GJ)
			delete layoutJson.transition;

			// add overviews if the previous story type did not support them
			if (!layoutJson.hasOverview) {
				layoutJson.showOverviews = {
					showStart: true,
					showEnd: true
				};
				layoutJson.hasOverview = true;
			}

			layoutJson.items.forEach(function (item, index) {
				item.data = {
					positionIndex: index
				};
			});
		},

		_isFreeform: function _isFreeform(layout) {
			return layout.type === 'container' && layout.items && layout.items[0].type === 'genericPage' && layout.items[0].layoutPositioning === 'absolute';
		},

		_convertFreeformToTemplate: function _convertFreeformToTemplate(topLayout) {
			var _this4 = this;

			/* Converting models with the layout:
    * - tab
    *   - container
    *     - layout positioning: absolute
    *       - [widgets]
    *
    * to:
    * - tab
    *   - container
    *     - layout positioning: relative
    *       - [widgets]
    */

			topLayout.items.filter(this._isFreeform.bind(this)).forEach(function (layout) {
				return _this4._convertToRelativeLayout(topLayout.pageSize, layout.items[0]);
			});
		},

		_convertToRelativeLayout: function _convertToRelativeLayout(referencePageSize, layout) {
			// Change layout to relative
			layout.layoutPositioning = 'relative';
			// loop over items in absolute layout (effectively widgets)
			layout.items.forEach(function (layoutItem) {
				// convert widget style represented in px to percent
				PxPercentUtil.changePixelPropertiesToPercent(layoutItem.style, referencePageSize);
			});
		},

		// we have no 'live' model to work with
		// so we work with the raw JSON
		_fitWidgetsToScenes: function _fitWidgetsToScenes(layout) {
			var _this5 = this;

			(layout.items || []).forEach(function (scene) {
				_this5._fitWidgetsToScene(scene);
			});
		},

		_fitWidgetsToScene: function _fitWidgetsToScene(childLayout) {
			var _this6 = this;

			// get all widgets/groups in scene/tab (basically anything with a style)
			var getStyledLayouts = function getStyledLayouts(layout) {
				if (layout.style) {
					return [layout];
				}
				return (layout.items || []).reduce(function (acc, child) {
					acc.push.apply(acc, getStyledLayouts(child));
					return acc;
				}, []);
			};

			var widgets = getStyledLayouts(childLayout);
			if (!widgets.length) {
				return;
			}

			// look for any widgets that are sticking out of the scene.
			// the initial value is 100%, resulting in no scaling if no widgets are more than that.
			var maxX = widgets.reduce(function (acc, widget) {
				var newX = (parseFloat(widget.style.left, 10) || 0) + (parseFloat(widget.style.width, 10) || 0);
				if (newX > 100) {
					_this6.hasOutOfBoundsWidget = true;
				}
				return Math.max(acc, newX);
			}, 100);
			var maxY = widgets.reduce(function (acc, widget) {
				var newY = (parseFloat(widget.style.top, 10) || 0) + (parseFloat(widget.style.height, 10) || 0);
				if (newY > 100) {
					_this6.hasOutOfBoundsWidget = true;
				}
				return Math.max(acc, newY);
			}, 100);

			// maintain aspect ratio
			var scale = Math.min(100 / maxX, 100 / maxY);
			if (scale < 1) {
				widgets.forEach(function (widget) {
					['top', 'left', 'width', 'height'].forEach(function (key) {
						if (widget.style[key] !== undefined) {
							widget.style[key] = (parseFloat(widget.style[key], 10) || 0) * scale + '%';
						}
					});
				});
			}
		}
	});

	return StoryService;
});
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