'use strict';

/**
 * Licensed Materials - Property of IBM
 * IBM Cognos Products: BI Cloud (C) Copyright IBM Corp. 2018, 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/ui/core/Class', '../../../app/nls/StringResources', './ThumbnailStore', '../../../lib/@waca/core-client/js/core-client/utils/UniqueId', '../../../lib/@waca/image-capture/dist/js/bundles/image-capture.min', '../../../lib/@waca/echo-cache/dist/js/bundles/echo-cache.min', '../../../lib/@waca/core-client/js/core-client/utils/ClassFactory', 'underscore', 'jquery'], function (Class, StringResources, ThumbnailStore, UniqueId, ImageCaptureLib, EchoCacheLib, ClassFactory, _, $) {

	/**
  * Unique DOM attributes to strip.
  * Every time a new thumbnail is generated, it contains unique bits of
  * information. For performance reasons, we need to compare the existing
  * thumbnail data with the one about to be stored. The unique attributes
  * need to be stripped for the compared data, or the comparison will always
  * yield false positives.
  * @type {Array}
  */
	var UNIQUE_DOM_ATTRIBUTES = ['id', 'clip-path'];

	var ImageCapture = ImageCaptureLib.default;
	var EchoCacheService = EchoCacheLib.EchoCacheService;

	var ThumbnailService = Class.extend({

		/**
   * local store
   * serves as a cache to store all thumbnails
   * @type {ThumbnailStore}
   */
		_store: null,

		/**
   * Echo cache service
   *
   * @type {EchoCacheService}
   */
		echoCacheService: null,

		/**
   * Thumbnail service class that has all the relevant logic regarding
   * the persistence of thumbnails
   *
   * @param {Object} [options] - options
   * @param {Object} [options.store] - store to initialize the instance with
   */
		init: function init() {
			var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};

			ThumbnailService.inherited('init', this, arguments);
			this._pendingRequests = {
				fetch: {}
			};
			this.readyPromise = this.initialize(options);
		},

		/**
   * Check whether the pending request type is valid or not
   *
   * @param {string} type - pending request type to validate
   *
   * @return {boolean} TRUE if pending request type is valid and FALSE if not
   */
		_isValidPendingRequestType: function _isValidPendingRequestType(type) {
			return !!this._pendingRequests[type];
		},

		/**
   * Set pending request
   *
   * @param {Object} options - pending request options
   * @param {string} options.type - type of pending request; valid values include: 'fetch'
   * @param {string} options.cacheId - unique cache id to store the request; if the request already exists,
   * @param {Promise} request - Promise that will resolve
   */
		setPendingRequest: function setPendingRequest(options, request) {

			if (!options) {
				throw new Error('Invalid options argument provided');
			}

			var type = options.type,
			    cacheId = options.cacheId;


			if (!cacheId) {
				throw new Error('Invalid cacheId option provided');
			}

			if (!this._isValidPendingRequestType(type)) {
				throw new Error('Invalid type: ' + type);
			}

			this._pendingRequests[type][cacheId] = request;
		},

		/**
   * Get pending request if exists
   *
   * @param {Object} options - pending request options
   * @param {string} options.type - type of pending request; valid values include: 'fetch'
   * @param {string} options.cacheId - cache id the previous request was stored under
   *
   * @return {Promise} Promise that resolves with the result of the same request
   */
		getPendingRequest: function getPendingRequest(options) {
			if (!options) {
				throw new Error('Invalid options argument provided');
			}

			var type = options.type,
			    cacheId = options.cacheId;


			if (!cacheId) {
				throw new Error('Invalid cacheId option provided');
			}

			if (!this._isValidPendingRequestType(type)) {
				throw new Error('Invalid type: ' + type);
			}

			return this._pendingRequests[type][cacheId];
		},

		/**
   * Initialize
   *
   * @param {object} options - options
   * @param {GlassContext} options.glassContext - glass context
   * @param {Object} [options.store] - store to use for the thumbnail store
   * @param {Object} [options.elementMap] - element map
   * @param {EchoCacheService} [options.echoCacheSvc] - echo cache service to use
   *
   * @return {Promise} promise resolved on success and rejected on failure
   */
		initialize: function initialize(_ref) {
			var glassContext = _ref.glassContext,
			    _ref$store = _ref.store,
			    store = _ref$store === undefined ? {} : _ref$store,
			    elementMap = _ref.elementMap,
			    echoCacheSvc = _ref.echoCacheSvc;

			this.glassContext = glassContext;
			this._store = new ThumbnailStore(store);
			this.echoCacheService = echoCacheSvc || new EchoCacheService({
				logger: glassContext.getCoreSvc('.Logger'),
				ajaxSvc: glassContext.getCoreSvc('.Ajax')
			});
			this._thumbnailGenerator = null;

			this._elements = {
				map: {},
				paths: elementMap
			};

			return this.initializeThumbnailGenerator();
		},

		/**
   * Initialize thumbnail generator
   *
   * @return {Promise} promise resolved on success and rejected on failure
   */
		initializeThumbnailGenerator: function initializeThumbnailGenerator() {
			var _this = this;

			var promise = void 0;
			if (this._elements.paths) {
				var elementKeys = Object.keys(this._elements.paths);
				promise = Promise.all(elementKeys.map(function (key) {
					return 'text!' + _this._elements.paths[key];
				}).map(function (path) {
					return ClassFactory.loadModule(path);
				})).then(function (elements) {
					elements.forEach(function (element, key) {
						var mapKey = elementKeys[key];
						if (mapKey) {
							_this._elements.map[mapKey] = element;
						}
					});
				}).catch(function (error) {
					_this.glassContext.getCoreSvc('.Logger').error('ThumbnailService.readyPromise:error', error);
				});
			} else {
				promise = Promise.resolve();
			}
			return promise.then(function () {
				_this._thumbnailGenerator = new ImageCapture({
					UniqueId: UniqueId,
					elementMap: _this._elements.map
				});
			});
		},

		/**
   * Destructor
   */
		destroy: function destroy() {
			if (this._thumbnailGenerator) {
				this._thumbnailGenerator.destroy();
			}
			this._elements = null;
			this._store = null;
		},

		/**
   * Add a thumbnail
   *
   * @param {string} widgetModel - widget model
   * @param {any} data - thumbnail data
   *
   * @return {Promise} Promise to be resolved on success and rejected with error
   */
		sync: function sync(widgetModel, data) {
			var _this2 = this;

			var result = void 0;
			if (data) {
				var updateToEchoService = function updateToEchoService(cacheId, data) {
					return _this2.update(cacheId, data).then(function (_ref2) {
						var cacheId = _ref2.cacheId,
						    affinity = _ref2.affinity;
						return _this2.fetch(cacheId, affinity);
					}).then(function (_ref3) {
						var data = _ref3.data,
						    cacheId = _ref3.cacheId;

						_this2._setCacheIdInWidgetAndStore(widgetModel, cacheId, data);
					}, function () {
						_this2._setCacheIdInWidgetAndStore(widgetModel, null, null); //remove previous thumbnail on failure
					});
				};
				result = this.fetch(widgetModel.thumbnailId, undefined, { silent: true }).then(function (_ref4) {
					var oldData = _ref4.data;

					if (_this2._needsUpdate(oldData, data)) {
						return updateToEchoService(widgetModel.thumbnailId, data);
					} else {
						var cachedData = _this2._store.getLocal(widgetModel.id);
						if (_this2._needsUpdate(cachedData, data)) {
							_this2._setCacheIdInWidgetAndStore(widgetModel, widgetModel.thumbnailId, data);
						}
						return { data: data };
					}
				}).catch(function () {
					return updateToEchoService(widgetModel.thumbnailId, data);
				});
			} else {
				this._setCacheIdInWidgetAndStore(widgetModel, null /*cacheId*/);
			}
			return result || Promise.resolve();
		},

		_setCacheIdInWidgetAndStore: function _setCacheIdInWidgetAndStore(widgetModel, cacheId, data) {
			var widgetId = widgetModel.id;
			var options = {
				payloadData: {
					runtimeOnly: true
				}
			};
			widgetModel.set({
				thumbnailId: cacheId
			}, options);

			if (cacheId) {
				this._store.set(widgetId, { data: data, cacheId: cacheId });
			} else {
				this._store.delete(widgetId);
			}
		},

		/**
   * Set error on the widget
   *
   * @param {string} widgetId - widget id
   * @param {Error} error - thumbnail error to store
   */
		setError: function setError(widgetId, error) {
			this._store.setError(widgetId, error);
		},

		/**
   * Set warning on the widget
   *
   * @param {string} widgetId - widget id
   * @param {Warning} warning - thumbnail warning to store
   */
		setWarning: function setWarning(widgetId, warning) {
			this._store.setWarning(widgetId, warning);
		},

		/**
   * Check whether the thumbnail is in dire need of an update
   *
   * @param {Object} data - old thumnail data
   * @param {Object} newData - new thumbnail data
   *
   * @return {boolean} TRUE if needs update and FALSE if not
   */
		_needsUpdate: function _needsUpdate(data, newData) {
			return this._stripUniqueAttributes(data) !== this._stripUniqueAttributes(newData) || this._getImgSrc(data) !== this._getImgSrc(newData);
		},

		_getImgSrc: function _getImgSrc(data) {
			var $data = $(data).find('img');
			if ($data) {
				return $data.attr('src');
			}
			return null;
		},
		/**
   * Strip unique attributes from the data
   *
   * @param {string} data - input data
   *
   * @return {string} output data with the unique DOM attributes stripped
   */
		_stripUniqueAttributes: function _stripUniqueAttributes(data) {
			var $data = $(data);
			UNIQUE_DOM_ATTRIBUTES.forEach(function (attr) {
				$data.find('[' + attr + ']').attr(attr, '');
			});
			return $data.html();
		},

		/**
   * Get store API
   *
   * @param {Object} options
   * @param {Function} options.defaultFn - default function to use in case there's no thumbnail with a specific id
   *
   * @return {object} store API
   */
		getStoreAPI: function getStoreAPI() {
			var _ref5 = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : { defaultFn: function defaultFn() {} },
			    defaultFn = _ref5.defaultFn;

			// clone the store instance and assign the `getVisTypeDefault` method
			return _.extend({}, this._store, {
				getVisTypeDefault: defaultFn
			});
		},

		/**
   * Get thumbnail base on the thumbnail model and vis type
   *
   * @param {WidgetModel} widgetModel - widget model
   * @param {string} type - vis type
   *
   * @return {Promise}
   */
		get: function get(widgetModel, type, storeAPI) {
			var _this3 = this;

			if (!storeAPI) {
				storeAPI = this._store;
			}

			var id = widgetModel.id;

			var promise = void 0;
			if (storeAPI.exists(id)) {
				promise = Promise.resolve(storeAPI.getLocal(id));
			} else {
				var cacheId = widgetModel.thumbnailId;
				if (cacheId) {
					promise = this.fetch(cacheId, undefined, { silent: true }).then(function (_ref6) {
						var data = _ref6.data,
						    cacheId = _ref6.cacheId;

						_this3._store.set(id, {
							data: data,
							cacheId: cacheId
						});
						return storeAPI.getLocal(id);
					}).catch(function () {
						// retrieval from cache failed
						// but don't reject, recover
						return undefined;
					});
				} else {
					promise = Promise.resolve();
				}
			}
			return promise.then(function () {
				return storeAPI.get(id, type);
			});
		},

		// --- AJAX methods

		/**
   * Fetch a specific thumbnail
   *
   * @param {string} cacheId - the thumbnail id
   * @param {string} [affinity] - server affinity to use (returned from the update call); cacheId and affinity are closely related. Making assumptions about the affinity is not recommended at this point.
   * @param {object} [options={}] - options
   * @param {boolean} [options.silent] - silent (don't log failures)
   *
   * @return {Promise} Promise that resolves with the thumbnail or rejects with error
   */
		fetch: function fetch(cacheId, affinity) {
			var _this4 = this;

			var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};


			if (!cacheId) {
				return Promise.reject(new Error('Invalid cacheId argument provided: ' + cacheId));
			}

			var pendingRequest = this.getPendingRequest({
				type: 'fetch',
				cacheId: cacheId
			});
			if (pendingRequest) {
				var isPromise = !!pendingRequest.then;
				if (isPromise) {
					// if promise, return as is
					return pendingRequest;
				} else {
					// it's an error
					return Promise.reject(pendingRequest);
				}
			}

			var request = this.echoCacheService.retrieve(cacheId, affinity).then(function (response) {

				// clear the pending request
				_this4.setPendingRequest({
					type: 'fetch',
					cacheId: cacheId
				}, undefined);

				var text = response.text;

				_this4.glassContext.getCoreSvc('.Logger').debug('ThumbnailService.fetch:response', response);
				return {
					cacheId: cacheId,
					data: text
				};
			}).catch(function (response) {

				var error = _this4._ajaxErrorHandler(response, 'ThumbnailService.fetch:error', options);

				// save the error as a pending request, to prevent subsequent request before any update has finished
				// @see ThumbnailService::update method
				_this4.setPendingRequest({
					type: 'fetch',
					cacheId: cacheId
				}, error);

				// reject the promise with the error.
				return Promise.reject(error);
			});

			this.setPendingRequest({
				type: 'fetch',
				cacheId: cacheId
			}, request);

			return request;
		},

		/**
   * Update a specific thumbnail
   *
   * @param {string} cacheId - the id of thumbnail
   * @param {string} thumbnail - thumbnail data
   * @param {object} [options={}] - options
   * @param {boolean} [options.silent] - silent (don't log failures)
   *
   * @return {Promise} Promise that resolves with the thumbnail or rejects with error
   */
		update: function update(cacheId, thumbnail, options) {
			var _this5 = this;

			return this.echoCacheService.stash(thumbnail, {
				cacheId: cacheId
			}).then(function (_ref7) {
				var id = _ref7.id,
				    location = _ref7.location,
				    affinity = _ref7.affinity;


				// clear the pending request on failure
				_this5.setPendingRequest({
					type: 'fetch',
					cacheId: id
				}, undefined);

				return {
					cacheId: id,
					location: location,
					affinity: affinity
				};
			}).catch(function (response) {
				return Promise.reject(_this5._ajaxErrorHandler(response, 'ThumbnailService.update:error', options));
			});
		},

		/**
   * Ajax error handler
   *
   * @param {Object} response - error response about to be handled
   * @param {string} logString - string used for logging
   */
		_ajaxErrorHandler: function _ajaxErrorHandler(response) {
			var logString = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'ThumbnailService:error';
			var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : { silent: false };
			var silent = options.silent;

			var message = this._parseError(response, StringResources.get('thumbnails_error_fetching'));
			var error = new Error(message);
			if (!silent) {
				this.glassContext.getCoreSvc('.Logger').error(logString, error);
			}
			return error;
		},

		/**
   * Parse error response
   *
   * @param {Object} response - ajax response
   * @param {string} response.responseText - ajax response text
   * @param {string} defaultMessage - default message in case there is no response text
   *
   * @return {string} final error text
   */
		_parseError: function _parseError(response, defaultMessage) {
			var message = defaultMessage;
			try {
				if (response.responseText) {
					var text = JSON.parse(response.responseText);
					message = text.error;
				}
			} catch (e) {
				// ignore JSON parsing errors
			}
			return message;
		},

		/**
   * Prepare thumbnail data
   *
   * @param {string} data - data to be prepared
   *
   * @return {string} prepared data
   */
		_prepareThumbnail: function _prepareThumbnail(data) {
			return JSON.stringify({ data: data });
		},

		/**
   * Generate image
   *
   * @param {DOMElement} _domNode - DOM node to generate image of
   * @param {object} options - options
   * @param {number} maxHeight - maximum height
   *
   * @return {Promise} Promise to be resolved on success and rejected on faiure
   */
		generateImage: function generateImage(_domNode, options, maxHeight) {
			options = _.extend(options || {}, {
				// the thumbnail generator takes the background color of selected node and applies them to
				// the thumbnail - we don't want this for nodes with static content, e.g. webpage widgets
				onClone: function onClone(doc, node) {
					var $staticNode = $(node).find('.staticContent');
					if ($staticNode.length) {
						$staticNode.css({ 'background-color': 'transparent' });
					}
				},
				excludeEmptyIframes: true,
				transparentBackground: false
			});
			return this._thumbnailGenerator.generateImage(_domNode, options, maxHeight);
		},

		/**
   * Generate image
   *
   * @param {DOMElement} _domNode - DOM node to generate image of
   * @param {object} options - options
   * @param {number} maxHeight - maximum height
   *
   * @return {Promise} Promise to be resolved on success and rejected on faiure
   */
		generateMarkup: function generateMarkup(_domNode, options, maxHeight) {
			return this.generateImage(_domNode, options, maxHeight).then(function (content) {
				return '<div class="visThumbnail"><div class="visThumbnailImgContainer"><img src="' + content + '" /></div></div>';
			});
		},

		/**
   * Delete thumbnail
   *
   * @param {id} thumbnail id
   * @return {ThumbnailStore} self; current instance
   */
		delete: function _delete(id) {
			return this._store.delete(id);
		}
	});

	return ThumbnailService;
});
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