/*
 * JavaScript for WikiEditor
 */

( function () {
	var editingSessionId;

	// This sets $.wikiEditor and $.fn.wikiEditor
	require( './jquery.wikiEditor.js' );

	function logEditEvent( data ) {
		if ( mw.config.get( 'wgMFMode' ) !== null ) {
			// Visiting a ?action=edit URL can, depending on user settings, result
			// in the MobileFrontend overlay appearing on top of WikiEditor. In
			// these cases, don't log anything.
			return;
		}
		mw.track( 'editAttemptStep', $.extend( {
			// eslint-disable-next-line camelcase
			editor_interface: 'wikitext',
			platform: 'desktop', // FIXME T249944
			integration: 'page'
		}, data ) );
	}

	function logEditFeature( feature, action ) {
		if ( mw.config.get( 'wgMFMode' ) !== null ) {
			// Visiting a ?action=edit URL can, depending on user settings, result
			// in the MobileFrontend overlay appearing on top of WikiEditor. In
			// these cases, don't log anything.
			return;
		}
		mw.track( 'visualEditorFeatureUse', {
			feature: feature,
			action: action,
			// eslint-disable-next-line camelcase
			editor_interface: 'wikitext',
			platform: 'desktop', // FIXME T249944
			integration: 'page'
		} );
	}

	function logAbort( switchingToVE, unmodified ) {
		if ( switchingToVE ) {
			logEditFeature( 'editor-switch', 'visual-desktop' );
		}

		var abortType;
		if ( switchingToVE && unmodified ) {
			abortType = 'switchnochange';
		} else if ( switchingToVE ) {
			abortType = 'switchwithout';
		} else if ( unmodified ) {
			abortType = 'nochange';
		} else {
			abortType = 'abandon';
		}

		logEditEvent( {
			action: 'abort',
			type: abortType
		} );
	}

	$( function () {
		var $textarea = $( '#wpTextbox1' ),
			$editingSessionIdInput = $( '#editingStatsId' ),
			origText = $textarea.val();

		// T263505, T249038
		$( '#wikieditorUsed' ).val( 'yes' );

		if ( $editingSessionIdInput.length ) {
			editingSessionId = $editingSessionIdInput.val();
			if ( window.performance && window.performance.timing ) {
				// We want to track from the time the user started to try to
				// launch the editor which navigationStart approximates. All
				// of our supported browsers *should* allow this. Rather than
				// fall back to the timestamp when the page loaded for those
				// that don't, we just ignore them, so as to not skew the
				// results towards better-performance in those cases.
				var readyTime = Date.now();
				logEditEvent( {
					action: 'ready',
					timing: readyTime - window.performance.timing.navigationStart
				} );
				$textarea.on( 'wikiEditor-toolbar-doneInitialSections', function () {
					logEditEvent( {
						action: 'loaded',
						timing: Date.now() - window.performance.timing.navigationStart
					} );
				} ).one( 'input', function () {
					logEditEvent( {
						action: 'firstChange',
						timing: Date.now() - readyTime
					} );
				} );
			}
			var $form = $textarea.closest( 'form' );
			if ( mw.user.options.get( 'uselivepreview' ) ) {
				$form.find( '#wpPreview' ).on( 'click', function () {
					logEditFeature( 'preview', 'preview-live' );
				} );
			}

			var submitting;
			$form.on( 'submit', function () {
				submitting = true;
			} );
			var onUnloadFallback = window.onunload;

			window.onunload = function () {
				var unmodified = mw.config.get( 'wgAction' ) !== 'submit' && origText === $textarea.val(),
					caVeEdit = $( '#ca-ve-edit' )[ 0 ],
					switchingToVE = caVeEdit && (
						document.activeElement === caVeEdit ||
						$.contains( caVeEdit, document.activeElement )
					);

				var fallbackResult;
				if ( onUnloadFallback ) {
					fallbackResult = onUnloadFallback();
				}

				if ( !submitting ) {
					logAbort( switchingToVE, unmodified );
				}

				// If/when the user uses the back button to go back to the edit form
				// and the browser serves this from bfcache, regenerate the session ID
				// so we don't use the same ID twice. Ideally we'd do this by listening to the pageshow
				// event and checking e.originalEvent.persisted, but that doesn't work in Chrome:
				// https://code.google.com/p/chromium/issues/detail?id=344507
				// So instead we modify the DOM here, after sending the abort event.
				editingSessionId = mw.user.generateRandomSessionId();
				$editingSessionIdInput.val( editingSessionId );

				return fallbackResult;
			};
			$textarea.on( 'wikiEditor-switching-visualeditor', function () {
				var unmodified = mw.config.get( 'wgAction' ) !== 'submit' && origText === $textarea.val();
				// A non-navigation switch to VE has occurred. As such, avoid eventually
				// double-logging an abort when VE is done.
				window.onunload = onUnloadFallback;

				logAbort( true, unmodified );
			} );

			// Add logging for Realtime Preview.
			mw.hook( 'ext.WikiEditor.realtimepreview.enable' ).add( function () {
				logEditFeature( 'preview', 'preview-realtime-on' );
			} );
			mw.hook( 'ext.WikiEditor.realtimepreview.inuse' ).add( function () {
				logEditFeature( 'preview', 'preview-realtime-inuse' );
			} );
			mw.hook( 'ext.WikiEditor.realtimepreview.disable' ).add( function () {
				logEditFeature( 'preview', 'preview-realtime-off' );
			} );
			mw.hook( 'ext.WikiEditor.realtimepreview.loaded' ).add( function () {
				logEditFeature( 'preview', 'preview-realtime-loaded' );
			} );
			mw.hook( 'ext.WikiEditor.realtimepreview.stop' ).add( function () {
				logEditFeature( 'preview', 'preview-realtime-error-stopped' );
			} );
			mw.hook( 'ext.WikiEditor.realtimepreview.reloadError' ).add( function () {
				logEditFeature( 'preview', 'preview-realtime-reload-error' );
			} );
			mw.hook( 'ext.WikiEditor.realtimepreview.reloadHover' ).add( function () {
				logEditFeature( 'preview', 'preview-realtime-reload-hover' );
			} );
			mw.hook( 'ext.WikiEditor.realtimepreview.reloadManual' ).add( function () {
				logEditFeature( 'preview', 'preview-realtime-reload-manual' );
			} );
		}

		// The old toolbar is still in place and needs to be removed so there aren't two toolbars
		$( '#toolbar' ).remove();
		// Add toolbar module
		// TODO: Implement .wikiEditor( 'remove' )
		mw.addWikiEditor( $textarea );
	} );

	mw.addWikiEditor = function ( $textarea ) {
		if ( $textarea.css( 'display' ) === 'none' ) {
			return;
		}

		$textarea.wikiEditor(
			'addModule', require( './jquery.wikiEditor.toolbar.config.js' )
		);

		var dialogsConfig = require( './jquery.wikiEditor.dialogs.config.js' );
		// Replace icons
		dialogsConfig.replaceIcons( $textarea );
		// Add dialogs module
		$textarea.wikiEditor( 'addModule', dialogsConfig.getDefaultConfig() );

	};

}() );
