/*!
 * ${copyright}
 */

// Provides class sap.ui.model.odata.ODataAnnotations
sap.ui.define([
	"./AnnotationParser",
	"sap/base/assert",
	"sap/base/Log",
	"sap/base/util/isEmptyObject",
	"sap/ui/base/EventProvider",
	"sap/ui/thirdparty/jquery"
], function (AnnotationParser, assert, Log, isEmptyObject, EventProvider, jQuery) {
	"use strict";


	/**
	 * @param {string|string[]} aAnnotationURI The annotation-URL or an array of URLs that should be parsed and merged
	 * @param {sap.ui.model.odata.ODataMetadata} oMetadata
	 * @param {object} mParams
	 *
	 * @class Implementation to access OData Annotations
	 *
	 * @author SAP SE
	 * @version
	 * ${version}
	 *
	 * @public
	 * @deprecated As of version 1.66, please use {@link sap.ui.model.odata.v2.ODataAnnotations} instead.
	 * @alias sap.ui.model.odata.ODataAnnotations
	 * @extends sap.ui.base.EventProvider
	 */
	var ODataAnnotations = EventProvider.extend("sap.ui.model.odata.ODataAnnotations", /** @lends sap.ui.model.odata.ODataAnnotations.prototype */
	{

		// constructor : function(aAnnotationURI, oMetadata, mParams) {
		constructor : function(mOptions) {
			EventProvider.apply(this, arguments);

			if (arguments.length !== 1) {
				// Old constructor argument syntax
				if (typeof arguments[2] === "object") {
					mOptions = arguments[2];
				}

				mOptions.urls = arguments[0];
				mOptions.metadata = arguments[1];
			}

			this.oMetadata = mOptions.metadata;
			this.oAnnotations = mOptions.annotationData ? mOptions.annotationData : {};
			this.bLoaded = false;
			this.bAsync = mOptions && mOptions.async;
			this.xPath = null;
			this.oError = null;
			this.bValidXML = true;
			this.oRequestHandles = [];
			this.oLoadEvent = null;
			this.oFailedEvent = null;
			this.mCustomHeaders = mOptions.headers ? jQuery.extend({}, mOptions.headers) : {};

			if (mOptions.urls) {
				this.addUrl(mOptions.urls);

				if (!this.bAsync) {
					// Synchronous loading, we can directly check for errors
					assert(
						!isEmptyObject(this.oMetadata),
						"Metadata must be available for synchronous annotation loading"
					);
					if (this.oError) {
						Log.error(
							"OData annotations could not be loaded: " + this.oError.message
						);
					}
				}
			}
		},
		metadata : {
			publicMethods : ["parse", "getAnnotationsData", "attachFailed", "detachFailed", "attachLoaded", "detachLoaded"]
		}

	});


	///////////////////////////////////////////////// Prototype Members ////////////////////////////////////////////////

	/**
	 * returns the raw annotation data
	 *
	 * @public
	 * @returns {object} returns annotations data
	 */
	ODataAnnotations.prototype.getAnnotationsData = function() {
		return this.oAnnotations;
	};

	/**
	 * Checks whether annotations from at least one source are available
	 *
	 * @public
	 * @returns {boolean} returns whether annotations is already loaded
	 */
	ODataAnnotations.prototype.isLoaded = function() {
		return this.bLoaded;
	};

	/**
	 * Checks whether annotations loading of at least one of the given URLs has already failed.
	 * Note: For asynchronous annotations {@link #attachFailed} has to be used.
	 *
	 * @public
	 * @returns {boolean} whether annotations request has failed
	 */
	ODataAnnotations.prototype.isFailed = function() {
		return this.oError !== null;
	};

	/**
	 * The <code>loaded</code> event is fired after new annotations have been added to this object.
	 *
	 * @name sap.ui.model.odata.ODataAnnotations#loaded
	 * @event
	 * @param {sap.ui.base.Event} oEvent
	 * @public
	 */

	/**
	 * Fires event {@link #event:loaded loaded} to attached listeners.
	 *
	 * @param {object} [oParameters] Parameters that will be given as parameters to the event handler
	 * @return {this} <code>this</code> to allow method chaining
	 * @protected
	 */
	ODataAnnotations.prototype.fireLoaded = function(oParameters) {
		this.fireEvent("loaded", oParameters);
		return this;
	};

	/**
	 * Attaches event handler <code>fnFunction</code> to the {@link #event:loaded loaded} event of this
	 * <code>sap.ui.model.odata.ODataAnnotations</code>.
	 *
	 * @param {object}
	 *            [oData] An application-specific payload object that will be passed to the event handler
	 *            along with the event object when firing the event
	 * @param {function}
	 *            fnFunction The function to be called, when the event occurs
	 * @param {object}
	 *            [oListener] Context object to call the event handler with. Defaults to this
	 *            <code>sap.ui.model.odata.ODataAnnotations</code> itself
	 *
	 * @returns {this} Reference to <code>this</code> in order to allow method chaining
	 * @public
	 */
	ODataAnnotations.prototype.attachLoaded = function(oData, fnFunction, oListener) {
		this.attachEvent("loaded", oData, fnFunction, oListener);
		return this;
	};

	/**
	 * Detaches event handler <code>fnFunction</code> from the {@link #event:loaded loaded} event of this
	 * <code>sap.ui.model.odata.ODataAnnotations</code>.
	 *
	 * The passed function and listener object must match the ones used for event registration.
	 *
	 * @param {function}
	 *            fnFunction The function to be called, when the event occurs
	 * @param {object}
	 *            [oListener] Context object on which the given function had to be called
	 * @returns {this} Reference to <code>this</code> in order to allow method chaining
	 * @public
	 */
	ODataAnnotations.prototype.detachLoaded = function(fnFunction, oListener) {
		this.detachEvent("loaded", fnFunction, oListener);
		return this;
	};


	/**
	 * The <code>failed</code> event is fired when loading, parsing or merging new annotations failed.
	 *
	 * @name sap.ui.model.odata.ODataAnnotations#failed
	 * @event
	 * @param {sap.ui.base.Event} oEvent
	 * @public
	 */

	/**
	 * Fires event {@link #event:failed failed} to attached listeners.
	 *
	 * @param {object} [oParameters] Parameters to pass along with the event
	 * @param {string} [oParameters.message]  A text that describes the failure.
	 * @param {string} [oParameters.statusCode]  HTTP status code returned by the request (if available)
	 * @param {string} [oParameters.statusText] The status as a text, details not specified, intended only for diagnosis output
	 * @param {string} [oParameters.responseText] Response that has been received for the request ,as a text string
	 *
	 * @returns {this} Reference to <code>this</code> in order to allow method chaining
	 * @protected
	 */
	ODataAnnotations.prototype.fireFailed = function(oParameters) {
		this.fireEvent("failed", oParameters);
		return this;
	};


	/**
	 * Attaches event handler <code>fnFunction</code> to the {@link #event:failed failed} event of this
	 * <code>sap.ui.model.odata.ODataAnnotations</code>.
	 *
	 *
	 * @param {object}
	 *            [oData] An application-specific payload object that will be passed to the event handler
	 *            along with the event object when firing the event
	 * @param {function}
	 *            fnFunction The function to be called, when the event occurs
	 * @param {object}
	 *            [oListener] Context object to call the event handler with. Defaults to this
	 *            <code>sap.ui.model.odata.ODataAnnotations</code> itself
	 *
	 * @returns {this} Reference to <code>this</code> in order to allow method chaining
	 * @public
	 */
	ODataAnnotations.prototype.attachFailed = function(oData, fnFunction, oListener) {
		this.attachEvent("failed", oData, fnFunction, oListener);
		return this;
	};

	/**
	 * Detaches event handler <code>fnFunction</code> from the {@link #event:failed failed} event of this
	 * <code>sap.ui.model.odata.ODataAnnotations</code>.
	 *
	 * The passed function and listener object must match the ones used for event registration.
	 *
	 * @param {function}
	 *            fnFunction The function to be called, when the event occurs
	 * @param {object}
	 *            [oListener] Context object on which the given function had to be called
	 * @returns {this} Reference to <code>this</code> in order to allow method chaining
	 * @public
	 */
	ODataAnnotations.prototype.detachFailed = function(fnFunction, oListener) {
		this.detachEvent("failed", fnFunction, oListener);
		return this;
	};

	/**
	 * Set custom headers which are provided in a key/value map. These headers are used for all requests.
	 * The Accept-Language header cannot be modified and is set using the Core's language setting.
	 *
	 * To remove these headers simply set the mHeaders parameter to {}. Please also note that when calling this method
	 * again all previous custom headers are removed unless they are specified again in the mCustomHeaders parameter.
	 *
	 * @param {Object<string,string>} mHeaders the header name/value map.
	 * @public
	 */
	ODataAnnotations.prototype.setHeaders = function(mHeaders) {
		// Copy headers (dont use reference to mHeaders map)
		this.mCustomHeaders = jQuery.extend({}, mHeaders);
	};

	/**
	 * Creates an XML document that can be used by this parser from the given XML content.
	 *
	 * @param {object|string} vXML Either an XML Document to be used for parsing or a string that should be parsed as an XML document. In case the first parameter is an object, the second parameter must be set to ensure browser compatibility
	 * @param {string} [sXMLContent] Fallback XML content as string in case the first parameter was an object and could not be used
	 * @returns {object} The compatible XML document object
	 * @private
	 */
	ODataAnnotations.prototype._createXMLDocument = function(vXML, sXMLContent) {
		var oXMLDoc = null;
		if (typeof vXML === "string") {
			sXMLContent = vXML;
			vXML = null;
		}

		if (vXML) {
			oXMLDoc = vXML;
		} else {
			oXMLDoc = new DOMParser().parseFromString(sXMLContent, 'application/xml');
		}

		return oXMLDoc;
	};

	/**
	 * Checks the given XML document for parse errors
	 *
	 * @param {object} oXMLDoc The XML document object
	 * @return {boolean} true if errors exist false otherwise
	 */
	ODataAnnotations.prototype._documentHasErrors = function(oXMLDoc) {
		return oXMLDoc.getElementsByTagName("parsererror").length > 0;
	};

	/**
	 * Merges the newly parsed annotation data into the already existing one.
	 * The merge operates on Terms and overwrites existing annotations on that level.
	 *
	 * @param {map} mAnnotations The new annotations that should be merged into the ones in this instance
	 * @param {boolean} [bSuppressEvents] if set to true, the "loaded"-event is not fired
	 */
	ODataAnnotations.prototype._mergeAnnotationData = function(mAnnotations, bSuppressEvents) {
		if (!this.oAnnotations) {
			this.oAnnotations = {};
		}

		AnnotationParser.merge(this.oAnnotations, mAnnotations);

		this.bLoaded = true;

		if (!bSuppressEvents) {
			this.fireLoaded({
				annotations: mAnnotations
			});
		}
	};

	/**
	 * Sets an XML document.
	 *
	 * @param {object} oXMLDocument The XML document to parse for annotations
	 * @param {string} sXMLContent The XML content as string to parse for annotations
	 * @param {object} [mOptions] Additional options
	 * @param {function} [mOptions.success] Success callback gets an objec as argument with the
	 *                   properties "annotations" containing the parsed annotations and "xmlDoc"
	 *                   containing the XML-Document that was returned by the request.
	 * @param {function} [mOptions.error] Error callback gets an objec as argument with the
	 *                   property "xmlDoc" containing the XML-Document that was returned by the
	 *                   request and could not be correctly parsed.
	 * @param {boolean}  [mOptions.fireEvents] If this option is set to true, events are fired as if the annotations
	 *                   were loaded from a URL
	 * @return {boolean} Whether or not parsing was successful
	 * @public
	 */
	ODataAnnotations.prototype.setXML = function(oXMLDocument, sXMLContent, mOptions) {
		// Make sure there are always callable handlers
		var mDefaultOptions = {
			success:    function() {},
			error:      function() {},
			fireEvents: false
		};
		mOptions = jQuery.extend({}, mDefaultOptions, mOptions);

		var oXMLDoc = this._createXMLDocument(oXMLDocument, sXMLContent);

		var fnParseDocument = function(oXMLDoc) {
			var mResult = {
				xmlDoc : oXMLDoc
			};

			var oAnnotations = AnnotationParser.parse(this.oMetadata, oXMLDoc);

			if (oAnnotations) {
				mResult.annotations = oAnnotations;
				mOptions.success(mResult);
				this._mergeAnnotationData(oAnnotations, !mOptions.fireEvents);
			} else {

				mOptions.error(mResult);
				if (mOptions.fireEvents) {
					this.fireFailed(mResult);
				}
			}
		}.bind(this, oXMLDoc);



		if (this._documentHasErrors(oXMLDoc)) {
			// Malformed XML, notify application of the problem

			// This seems to be needed since with some jQuery versions the XML document
			// is partly parsed and with some it is not parsed at all. We now choose the
			// "safe" approach and only accept completely valid documents.
			mOptions.error({
				xmlDoc : oXMLDoc
			});
			return false;
		} else {
			// Check if Metadata is loaded on the model. We need the Metadata to parse the annotations

			var oMetadata = this.oMetadata.getServiceMetadata();
			if (!oMetadata || isEmptyObject(oMetadata)) {
				// Metadata is not loaded, wait for it before trying to parse
				this.oMetadata.attachLoaded(fnParseDocument);
			} else {
				fnParseDocument();
			}
			return true;
		}
	};

	/**
	 * Adds either one URL or an array of URLs to be loaded and parsed. The result will be merged into the annotations
	 * data which can be retrieved using the getAnnotations-method.
	 *
	 * @param {string|string[]} vUrl Either one URL as string or an array of URL strings
	 * @return {Promise} The Promise to load the given URL(s), resolved if all URLs have been loaded, rejected if at
	 *         least one failed to load. The argument is an object containing the annotations object, success (an array
	 *         of sucessfully loaded URLs), fail (an array ob of failed URLs).
	 * @public
	 */
	ODataAnnotations.prototype.addUrl = function(vUrl) {
		var that = this;

		var aUris = vUrl;

		if (Array.isArray(vUrl) && vUrl.length == 0) {
			return Promise.resolve({annotations: this.oAnnotations});
		}

		if (!Array.isArray(vUrl)) {
			aUris = [ vUrl ];
		}

		return new Promise(function(fnResolve, fnReject) {
			var iLoadCount = 0;

			var mResults = {
				annotations: null,
				success: [],
				fail: []
			};
			var fnRequestCompleted = function(mResult) {
				iLoadCount++;

				if (mResult.type === "success") {
					mResults.success.push(mResult);
				} else {
					mResults.fail.push(mResult);
				}

				if (iLoadCount === aUris.length) {
					// Finished loading all URIs
					mResults.annotations = that.oAnnotations;

					if (mResults.success.length > 0) {
						// For compatibility reasons, we fire the loaded event if at least one has been loaded...
						var mSuccess = {
							annotations: that.oAnnotations,
							results: mResults
						};

						that.fireLoaded(mSuccess);
					}

					if (mResults.success.length < aUris.length) {
						// firefailed is called for every failed URL in _loadFromUrl
						var oError = new Error("At least one annotation failed to load/parse/merge");
						oError.annotations = mResults.annotations;
						oError.success = mResults.success;
						oError.fail = mResults.fail;
						fnReject(oError);
					} else {
						// All URLs could be loaded and parsed
						fnResolve(mResults);
					}
				}
			};

			var i = 0;
			if (that.bAsync) {
				var promiseChain = Promise.resolve();

				for (i = 0; i < aUris.length; ++i) {
					var fnLoadNext = that._loadFromUrl.bind(that, aUris[i]);
					promiseChain = promiseChain
						.then(fnLoadNext, fnLoadNext)
						.then(fnRequestCompleted, fnRequestCompleted);
				}

			} else {
				for (i = 0; i < aUris.length; ++i) {
					that._loadFromUrl(aUris[i]).then(fnRequestCompleted, fnRequestCompleted);
				}
			}
		});
	};

	/**
	 * Returns a promise to load and parse annotations from a single URL, resolves if the URL could be loaded and parsed, rejects
	 * otherwise
	 *
	 * @param {string} sUrl The URL to load
	 * @return {Promise} The promise to load the URL. Argument contains information about the failed or succeeded request
	 */
	ODataAnnotations.prototype._loadFromUrl = function(sUrl) {
		var that = this;
		return new Promise(function(fnResolve, fnReject) {
			var mAjaxOptions = {
				url: sUrl,
				async: that.bAsync,
				headers: jQuery.extend({}, that.mCustomHeaders, {
					"Accept-Language": sap.ui.getCore().getConfiguration().getLanguageTag() // Always overwrite
				})
			};

			var oRequestHandle;
			var fnFail = function(oJQXHR, sStatusText) {
				if (oRequestHandle && oRequestHandle.bSuppressErrorHandlerCall) {
					return;
				}

				that.oError = {
					type:			"fail",
					url:			sUrl,
					message:		sStatusText,
					statusCode:		oJQXHR.status,
					statusText:		oJQXHR.statusText,
					responseText:	oJQXHR.responseText
				};

				if (that.bAsync) {
					that.oFailedEvent = setTimeout(that.fireFailed.bind(that, that.oError), 0);
				} else {
					that.fireFailed(that.oError);
				}

				fnReject(that.oError);

			};

			var fnSuccess = function(sData, sStatusText, oJQXHR) {
				that.setXML(oJQXHR.responseXML, oJQXHR.responseText, {
					success: function(mData) {
						fnResolve({
							type:			"success",
							url: 			sUrl,
							message:		sStatusText,
							statusCode:		oJQXHR.status,
							statusText:		oJQXHR.statusText,
							responseText:		oJQXHR.responseText
						});
					},
					error : function(mData) {
						fnFail(oJQXHR, "Malformed XML document");
					},
					url: sUrl
				});
			};

			jQuery.ajax(mAjaxOptions).done(fnSuccess).fail(fnFail);
		});
	};


	ODataAnnotations.prototype.destroy = function() {
		// Abort pending xml request
		for (var i = 0; i < this.oRequestHandles.length; ++i) {
			if (this.oRequestHandles[i]) {
				this.oRequestHandles[i].bSuppressErrorHandlerCall = true;
				this.oRequestHandles[i].abort();
				this.oRequestHandles[i] = null;
			}
		}

		EventProvider.prototype.destroy.apply(this, arguments);
		if (this.oLoadEvent) {
			clearTimeout(this.oLoadEvent);
		}
		if (this.oFailedEvent) {
			clearTimeout(this.oFailedEvent);
		}
	};


	return ODataAnnotations;

});