/* global moment:false */
/**
 * Controller for Echo notifications
 *
 * @param {mw.echo.api.EchoApi} echoApi Echo API
 * @param {mw.echo.dm.ModelManager} manager Model manager
 */
mw.echo.Controller = function MwEchoController( echoApi, manager ) {
	this.api = echoApi;
	this.manager = manager;
};

/* Initialization */

OO.initClass( mw.echo.Controller );

/**
 * Update a filter value.
 * The method accepts a filter name and as many arguments
 * as needed.
 *
 * @param {string} filter Filter name
 */
mw.echo.Controller.prototype.setFilter = function ( filter ) {
	const filtersModel = this.manager.getFiltersModel(),
		values = Array.prototype.slice.call( arguments );

	values.shift();

	if ( filter === 'readState' ) {
		filtersModel.setReadState( values[ 0 ] );
	} else if ( filter === 'sourcePage' ) {
		filtersModel.setCurrentSourcePage( values[ 0 ], values[ 1 ] );
		this.manager.getLocalCounter().setSource( filtersModel.getSourcePagesModel().getCurrentSource() );
	}

	// Reset pagination
	this.manager.getPaginationModel().reset();
};

/**
 * Fetch the next page by date
 *
 * @return {jQuery.Promise} A promise that resolves with an object where the keys are
 *  days and the items are item IDs.
 */
mw.echo.Controller.prototype.fetchNextPageByDate = function () {
	this.manager.getPaginationModel().forwards();
	return this.fetchLocalNotificationsByDate();
};

/**
 * Fetch the previous page by date
 *
 * @return {jQuery.Promise} A promise that resolves with an object where the keys are
 *  days and the items are item IDs.
 */
mw.echo.Controller.prototype.fetchPrevPageByDate = function () {
	this.manager.getPaginationModel().backwards();
	return this.fetchLocalNotificationsByDate();
};

/**
 * Fetch the first page by date
 *
 * @return {jQuery.Promise} A promise that resolves with an object where the keys are
 *  days and the items are item IDs.
 */
mw.echo.Controller.prototype.fetchFirstPageByDate = function () {
	this.manager.getPaginationModel().setCurrPageIndex( 0 );
	return this.fetchLocalNotificationsByDate();
};

/**
 * Fetch unread pages in all wikis and create foreign API sources
 * as needed.
 *
 * @return {jQuery.Promise} A promise that resolves when the page filter
 *  model is updated with the unread notification count per page per wiki
 */
mw.echo.Controller.prototype.fetchUnreadPagesByWiki = function () {
	const filterModel = this.manager.getFiltersModel(),
		sourcePageModel = filterModel.getSourcePagesModel();

	return this.api.fetchUnreadNotificationPages()
		.then( ( data ) => {
			const result = {},
				foreignSources = {};

			for ( const source in data ) {
				if ( source !== mw.config.get( 'wgWikiID' ) ) {
					// Collect sources for API
					foreignSources[ source ] = data[ source ].source;
				}
				result[ source === mw.config.get( 'wgWikiID' ) ? 'local' : source ] = data[ source ];
			}

			// Register the foreign sources in the API
			this.api.registerForeignSources( foreignSources, false );

			// Register pages
			sourcePageModel.setAllSources( result );
		} );
};

/**
 * Fetch notifications from the local API and sort them by date.
 * This method ignores cross-wiki notifications and bundles.
 *
 * @param {number} [page] Page number. If not given, it defaults to the current
 *  page.
 * @return {jQuery.Promise} A promise that resolves with an object where the keys are
 *  days and the items are item IDs.
 */
mw.echo.Controller.prototype.fetchLocalNotificationsByDate = function ( page ) {
	const pagination = this.manager.getPaginationModel(),
		filters = this.manager.getFiltersModel(),
		currentSource = filters.getSourcePagesModel().getCurrentSource(),
		continueValue = pagination.getPageContinue( page || pagination.getCurrPageIndex() );

	pagination.setItemsPerPage( this.api.getLimit() );

	return this.api.fetchFilteredNotifications(
		this.manager.getTypeString(),
		currentSource,
		{
			continue: continueValue,
			readState: filters.getReadState(),
			titles: filters.getSourcePagesModel().getGroupedPagesForCurrentTitle(),
		},
	)
		.then( ( data ) => {
			const dateItemIds = {},
				dateItems = {},
				models = {};

			data = data || { list: [] };

			// Go over the data
			for ( let i = 0; i < data.list.length; i++ ) {
				const notifData = data.list[ i ];

				// Set source's seenTime
				// TODO: This query brings up mixed alert and message notifications.
				// Regularly, each of those will have a different seenTime that is
				// calculated for each badge, but for this page, both are fetched.
				// For the moment, we are picking the max seenTime from
				// either alert or notice and updating both, since the page gives
				// us a mixed view which will update both seenTime to be the same
				// anyways.
				const maxSeenTime = data.seenTime.alert < data.seenTime.notice ?
					data.seenTime.notice : data.seenTime.alert;
				this.manager.getSeenTimeModel().setSeenTime(
					maxSeenTime,
				);

				// Collect common data
				const newNotifData = this.createNotificationData( notifData );
				if ( notifData.type !== 'foreign' ) {
					const localizedDate = moment.utc( newNotifData.timestamp ).local().format( 'YYYYMMDD' );

					newNotifData.modelName = 'local_' + localizedDate;
					newNotifData.source = currentSource;

					// Single notifications
					const itemModel = new mw.echo.dm.NotificationItem(
						notifData.id,
						newNotifData,
					);

					dateItems[ localizedDate ] = dateItems[ localizedDate ] || [];
					dateItems[ localizedDate ].push( itemModel );

					dateItemIds[ localizedDate ] = dateItemIds[ localizedDate ] || [];
					dateItemIds[ localizedDate ].push( notifData.id );
				}
			}

			// Fill in the models
			for ( const date in dateItems ) {
				const symbolicName = 'local_' + date;

				// Set up model
				models[ symbolicName ] = new mw.echo.dm.NotificationsList( {
					type: this.manager.getTypes(),
					name: symbolicName,
					source: currentSource,
					title: date,
					timestamp: date,
					sortingCallback: function ( a, b ) {
						// Reverse sorting. In the special page we want the
						// items sorted only by timestamp, regardless of
						// read/unread state
						if ( b.getTimestamp() < a.getTimestamp() ) {
							return -1;
						} else if ( b.getTimestamp() > a.getTimestamp() ) {
							return 1;
						}

						// Fallback on IDs
						return b.getId() - a.getId();
					},
				} );
				models[ symbolicName ].setItems( dateItems[ date ] );
			}

			// Register local sources
			this.api.registerLocalSources( Object.keys( models ) );

			// Update the manager
			this.manager.setNotificationModels( models );

			// Update the pagination
			pagination.setNextPageContinue( data.continue );

			// Update the local counter
			this.manager.getLocalCounter().update();

			return dateItemIds;
		} )
		.then(
			null,
			( errCode, errObj ) => $.Deferred().reject( {
				errCode: errCode,
				errInfo: OO.getProp( errObj, 'error', 'info' ),
			} ),
		);
};
/**
 * Fetch notifications from the local API and update the notifications list.
 *
 * @param {boolean} [isForced] Force a renewed fetching promise. If set to false, the
 *  model will request the stored/cached fetching promise from the API. A 'true' value
 *  will force the API to re-request that information from the server and update the
 *  notifications.
 * @return {jQuery.Promise} A promise that resolves with an array of notification IDs
 */
mw.echo.Controller.prototype.fetchLocalNotifications = function ( isForced ) {
	// Create a new local list model
	const localListModel = new mw.echo.dm.NotificationsList( {
			type: this.manager.getTypes(),
		} ),
		localItems = [],
		idArray = [];

	this.manager.counter.update();

	// Fetch the notifications from the database
	// Initially, we're going to have to split the operation
	// between local notifications and x-wiki notifications
	// until the backend gives us the x-wiki notifications as
	// part of the original response.
	return this.api.fetchNotifications( this.manager.getTypeString(), 'local', !!isForced, { unreadFirst: true, bundle: true } /* filters */ )
		.then(
			// Success
			( data ) => {
				const allModels = { local: localListModel },
					createBundledNotification = ( modelName, rawBundledNotifData ) => {
						const bundleNotifData = this.createNotificationData( rawBundledNotifData );
						bundleNotifData.bundled = true;
						bundleNotifData.modelName = modelName;
						return new mw.echo.dm.NotificationItem(
							rawBundledNotifData.id,
							bundleNotifData,
						);
					};

				data = data || { list: [] };

				// Go over the data
				for ( let i = 0; i < data.list.length; i++ ) {
					const notifData = data.list[ i ];

					// Set source's seenTime
					this.manager.getSeenTimeModel().setSeenTime(
						this.getTypes().length > 1 ?
							(
								data.seenTime.alert < data.seenTime.notice ?
									data.seenTime.notice : data.seenTime.alert
							) :
							data.seenTime[ this.getTypeString() ],
					);

					// Collect common data
					const newNotifData = this.createNotificationData( notifData );
					if ( notifData.type === 'foreign' ) {
						// x-wiki notification multi-group
						// We need to request a new list model
						newNotifData.name = 'xwiki';
						const foreignListModel = allModels.xwiki = new mw.echo.dm.CrossWikiNotificationItem( notifData.id, newNotifData );
						foreignListModel.setForeign( true );

						// Register foreign sources
						this.api.registerForeignSources( notifData.sources, true );
						// Add the lists according to the sources
						for ( const source in notifData.sources ) {
							foreignListModel.getList().addGroup(
								source,
								notifData.sources[ source ],
							);
						}

					} else if ( Array.isArray( newNotifData.bundledNotifications ) ) {
						// local bundle
						newNotifData.modelName = 'bundle_' + notifData.id;
						const itemModel = new mw.echo.dm.BundleNotificationItem(
							notifData.id,
							newNotifData.bundledNotifications.map( createBundledNotification.bind( null, newNotifData.modelName ) ),
							newNotifData,
						);
						allModels[ newNotifData.modelName ] = itemModel;
					} else {
						// Local single notifications
						const itemModel = new mw.echo.dm.NotificationItem(
							notifData.id,
							newNotifData,
						);

						idArray.push( notifData.id );
						localItems.push( itemModel );

						if ( newNotifData.bundledNotifications ) {
							// This means that bundledNotifications is truthy
							// but is not an array. We should log this in the console
							mw.log.warn(
								'newNotifData.bundledNotifications is expected to be an array,' +
								'but instead received "' + typeof newNotifData.bundledNotifications + '"',
							);
						}
					}

				}

				// Refresh local items
				localListModel.addItems( localItems );

				// Update the this
				this.manager.setNotificationModels( allModels );

				return idArray;
			},
			// Failure
			( errCode, errObj ) => {
				if ( !this.manager.getNotificationModel( 'local' ) ) {
					// Update the this
					this.manager.setNotificationModels( { local: localListModel } );
				}
				return $.Deferred().reject( {
					errCode: errCode,
					errInfo: OO.getProp( errObj, 'error', 'info' ),
				} );
			},
		);
};

/**
 * Create notification data config object for notification items from the
 * given API data.
 *
 * @param {Object} apiData API data
 * @return {Object} Notification config data object
 */
mw.echo.Controller.prototype.createNotificationData = function ( apiData ) {
	const content = apiData[ '*' ] || {};

	let utcTimestamp;
	if ( apiData.timestamp.utciso8601 ) {
		utcTimestamp = apiData.timestamp.utciso8601;
	} else {
		// Temporary until c05133283af0486e08c9a97a468bc075e238f2d2 rolls out to the
		// whole WMF cluster
		const utcIsoMoment = moment.utc( apiData.timestamp.utcunix * 1000 );
		utcTimestamp = utcIsoMoment.format( 'YYYY-MM-DD[T]HH:mm:ss[Z]' );
	}

	return {
		type: apiData.section,
		foreign: false,
		source: 'local',
		count: apiData.count,
		read: !!apiData.read,
		seen: (
			!!apiData.read ||
			utcTimestamp <= this.manager.getSeenTime()
		),
		timestamp: utcTimestamp,
		category: apiData.category,
		content: {
			header: content.header,
			compactHeader: content.compactHeader,
			body: content.body,
		},
		iconUrl: content.iconUrl,
		iconType: content.icon,
		primaryUrl: OO.getProp( content.links, 'primary', 'url' ),
		secondaryUrls: OO.getProp( content.links, 'secondary' ) || [],
		bundledIds: apiData.bundledIds,
		bundledNotifications: apiData.bundledNotifications,
	};
};

/**
 * Mark all items within a given list model as read.
 *
 * NOTE: This method is strictly for list models, and will not work for
 * group list models. To mark items as read in the xwiki model, whether
 * it is pre-populated or not, please see #markEntireCrossWikiItemAsRead
 *
 * @param {string} [modelName] Symbolic name for the model
 * @param {boolean} [isRead=true]
 * @return {jQuery.Promise} Promise that is resolved when all items
 *  were marked as read.
 */
mw.echo.Controller.prototype.markEntireListModelRead = function ( modelName, isRead ) {
	const itemIds = [],
		model = this.manager.getNotificationModel( modelName || 'local' );

	if ( !model ) {
		// Model doesn't exist
		return $.Deferred().reject();
	}

	// Default to true
	isRead = isRead === undefined ? true : isRead;

	const items = model.getItems();
	for ( let i = 0; i < items.length; i++ ) {
		const item = items[ i ];
		if ( item.isRead() !== isRead ) {
			itemIds.push( item.getId() );
		}
	}

	return this.markItemsRead( itemIds, model.getName(), isRead );
};

/**
 * Mark all notifications of a certain source as read, even those that
 * are not currently displayed.
 *
 * @param {string} [source] Notification source. If not given, the currently
 *  selected source is used.
 * @return {jQuery.Promise} A promise that is resolved after
 *  all notifications for the given source were marked as read
 */
mw.echo.Controller.prototype.markAllRead = function ( source ) {
	const itemIds = [],
		readState = this.manager.getFiltersModel().getReadState(),
		localCounter = this.manager.getLocalCounter();

	source = source || this.manager.getFiltersModel().getSourcePagesModel().getCurrentSource();

	this.manager.getNotificationsBySource( source ).forEach( ( notification ) => {
		if ( !notification.isRead() ) {
			itemIds.push( ...notification.getAllIds() );
			notification.toggleRead( true );

			if ( readState === 'unread' ) {
				// Remove the items if we are in 'unread' filter state
				const model = this.manager.getNotificationModel( notification.getModelName() );
				model.discardItems( notification );
			}
		}
	} );

	// Update pagination count
	this.manager.updateCurrentPageItemCount();

	localCounter.estimateChange( -itemIds.length );
	return this.api.markAllRead(
		source,
		this.getTypes(),
	).then(
		this.refreshUnreadCount.bind( this ),
	).then(
		localCounter.update.bind( localCounter, true ),
	);
};

/**
 * Mark all local notifications as read
 *
 * @return {jQuery.Promise} Promise that is resolved when all
 *  local notifications have been marked as read.
 */
mw.echo.Controller.prototype.markLocalNotificationsRead = function () {
	const readState = this.manager.getFiltersModel().getReadState(),
		modelItems = {};

	this.manager.getLocalNotifications().forEach( ( notification ) => {
		if ( !notification.isRead() ) {
			notification.toggleRead( true );

			const modelName = notification.getModelName();
			modelItems[ modelName ] = modelItems[ modelName ] || [];
			modelItems[ modelName ].push( notification );
		}
	} );

	// Remove the items if we are in 'unread' filter state
	if ( readState === 'unread' ) {
		for ( const name in modelItems ) {
			const model = this.manager.getNotificationModel( name );
			model.discardItems( modelItems[ name ] );
		}
	}

	// Update pagination count
	this.manager.updateCurrentPageItemCount();

	this.manager.getLocalCounter().setCount( 0, false );
	return this.api.markAllRead( 'local', this.getTypeString() ).then( this.refreshUnreadCount.bind( this ) );
};

/**
 * Fetch notifications from the cross-wiki sources.
 *
 * @return {jQuery.Promise} Promise that is resolved when all items
 *  from the cross-wiki sources are populated into the cross-wiki
 *  model.
 */
mw.echo.Controller.prototype.fetchCrossWikiNotifications = function () {
	const xwikiModel = this.manager.getNotificationModel( 'xwiki' );

	if ( !xwikiModel ) {
		// There is no xwiki notifications model, so we can't
		// fetch into it
		return $.Deferred().reject().promise();
	}

	return this.api.fetchNotificationGroups( xwikiModel.getSourceNames(), this.manager.getTypeString(), true )
		.then(
			( groupList ) => {
				for ( const group in groupList ) {
					const listModel = xwikiModel.getItemBySource( group );
					const groupItems = groupList[ group ];

					const items = [];
					for ( let i = 0; i < groupItems.length; i++ ) {
						const notifData = this.createNotificationData( groupItems[ i ] );
						items.push(
							new mw.echo.dm.NotificationItem( groupItems[ i ].id, Object.assign( notifData, {
								modelName: 'xwiki',
								source: group,
								bundled: true,
								foreign: true,
							} ) ),
						);
					}
					// Add items
					listModel.setItems( items );
				}
			},
			( errCode, errObj ) => $.Deferred().reject( {
				errCode: errCode,
				errInfo: errCode === 'http' ?
					mw.msg( 'echo-api-failure-cross-wiki' ) :
					OO.getProp( errObj, 'error', 'info' ),
			} ),
		);
};

/**
 * Mark local items as read in the API.
 *
 * @param {string[]|string} itemIds An array of item IDs, or a single item ID, to mark as read
 * @param {string} modelName The name of the model that these items belong to
 * @param {boolean} [isRead=true] The read state of the item; true for marking the
 *  item as read, false for marking the item as unread
 * @return {jQuery.Promise} A promise that is resolved when the operation
 *  is complete, with the number of unread notifications still remaining
 *  for the set type of this controller, in the given source.
 */
mw.echo.Controller.prototype.markItemsRead = function ( itemIds, modelName, isRead ) {
	const model = this.manager.getNotificationModel( modelName ),
		readState = this.manager.getFiltersModel().getReadState(),
		allIds = [];

	itemIds = Array.isArray( itemIds ) ? itemIds : [ itemIds ];

	// Default to true
	isRead = isRead === undefined ? true : isRead;

	const items = model.findByIds( itemIds );

	// If we are only looking at specific read state,
	// then we need to make sure the items are removed
	// from the visible list, because they no longer
	// correspond with the chosen state filter
	if ( readState === 'read' && !isRead ) {
		model.discardItems( items );
	} else if ( readState === 'unread' && isRead ) {
		model.discardItems( items );
		// TODO: We should also find a way to update the pagination
		// here properly. Do we pull more items from the next page
		// when items are cleared? Do we set some threshhold for
		// removed items where if it is reached, we update the list
		// to reflect the new pagination? etc.
	}

	items.forEach( ( notification ) => {
		allIds.push( ...notification.getAllIds() );
		if ( readState === 'all' ) {
			notification.toggleRead( isRead );
		}
	} );

	// Update pagination count
	this.manager.updateCurrentPageItemCount();

	this.manager.getUnreadCounter().estimateChange( isRead ? -allIds.length : allIds.length );
	if ( modelName !== 'xwiki' ) {
		// For the local counter, we should only estimate the change if the items
		// are not cross-wiki
		this.manager.getLocalCounter().estimateChange( isRead ? -allIds.length : allIds.length );
	}

	return this.api.markItemsRead( allIds, model.getSource(), isRead ).then( this.refreshUnreadCount.bind( this ) );
};

/**
 * Mark cross-wiki items as read in the API.
 *
 * @param {string[]|string} itemIds An array of item IDs, or a single item ID, to mark as read
 * @param {string} source The name for the source list that these items belong to
 * @return {jQuery.Promise} A promise that is resolved when the operation
 *  is complete, with the number of unread notifications still remaining
 *  for the set type of this controller, in the given source.
 */
mw.echo.Controller.prototype.markCrossWikiItemsRead = function ( itemIds, source ) {
	const allIds = [],
		xwikiModel = this.manager.getNotificationModel( 'xwiki' );

	if ( !xwikiModel ) {
		return $.Deferred().reject().promise();
	}
	itemIds = Array.isArray( itemIds ) ? itemIds : [ itemIds ];

	const sourceModel = xwikiModel.getList().getGroupByName( source );
	const notifs = sourceModel.findByIds( itemIds );
	sourceModel.discardItems( notifs );
	// Update pagination count
	this.manager.updateCurrentPageItemCount();

	notifs.forEach( ( notif ) => {
		allIds.push( ...notif.getAllIds() );
	} );
	this.manager.getUnreadCounter().estimateChange( -allIds.length );
	return this.api.markItemsRead( allIds, source, true )
		.then( this.refreshUnreadCount.bind( this ) );
};

/**
 * Mark all cross-wiki notifications from all sources as read
 *
 * @return {jQuery.Promise} Promise that is resolved when all notifications
 *  are marked as read
 */
mw.echo.Controller.prototype.markEntireCrossWikiItemAsRead = function () {
	const xwikiModel = this.manager.getNotificationModel( 'xwiki' );

	if ( !xwikiModel ) {
		return $.Deferred().reject().promise();
	}

	this.manager.getUnreadCounter().estimateChange( -xwikiModel.getCount() );

	return this.api.fetchNotificationGroups( xwikiModel.getSourceNames(), this.manager.getTypeString() )
		.then( ( groupList ) => {
			const promises = [];

			for ( const group in groupList ) {
				const listModel = xwikiModel.getItemBySource( group );
				const groupItems = groupList[ group ];

				const idArray = [];
				for ( let i = 0; i < groupItems.length; i++ ) {
					idArray.push( groupItems[ i ].id, ...( groupItems[ i ].bundledIds || [] ) );
				}

				// Mark items as read in the API
				promises.push(
					this.api.markItemsRead( idArray, listModel.getName(), true ),
				);
			}

			// Synchronously remove this model from the widget
			this.removeCrossWikiItem();

			return mw.echo.api.NetworkHandler.static.waitForAllPromises( promises ).then(
				this.refreshUnreadCount.bind( this ),
			);
		} );
};

/**
 * Remove the entire cross-wiki model.
 */
mw.echo.Controller.prototype.removeCrossWikiItem = function () {
	this.manager.removeNotificationModel( 'xwiki' );
};

/**
 * Refresh the unread notifications counter
 *
 * @return {jQuery.Promise} A promise that is resolved when the counter
 *  is updated with the actual unread count from the server.
 */
mw.echo.Controller.prototype.refreshUnreadCount = function () {
	return this.manager.getUnreadCounter().update();
};

/**
 * Update global seenTime for all sources
 *
 * @return {jQuery.Promise} A promise that is resolved when the
 *  seenTime was updated for all the controller's types and sources.
 */
mw.echo.Controller.prototype.updateSeenTime = function () {
	return this.api.updateSeenTime(
		this.getTypes(),
		// For consistency, use current source, though seenTime
		// will be updated globally
		this.manager.getFiltersModel().getSourcePagesModel().getCurrentSource(),
	)
		.then( ( time ) => {
			this.manager.getSeenTimeModel().setSeenTime( time );
		} );
};

/**
 * Perform a dynamic action
 *
 * @param {Object} data Action data for the network
 * @param {string} [source] Requested source to query. Defaults to currently
 *  selected source.
 * @return {jQuery.Promise} jQuery promise that resolves when the action is done
 */
mw.echo.Controller.prototype.performDynamicAction = function ( data, source ) {
	source = source || this.manager.getFiltersModel().getSourcePagesModel().getCurrentSource();
	return this.api.queryAPI( data, source );
};

/**
 * Get the types associated with the controller and model
 *
 * @return {string[]} Notification types
 */
mw.echo.Controller.prototype.getTypes = function () {
	return this.manager.getTypes();
};

/**
 * Return a string representation of the notification type.
 * It could be 'alert', 'message' or, if both are set, 'all'
 *
 * @return {string} String representation of notifications type
 */
mw.echo.Controller.prototype.getTypeString = function () {
	return this.manager.getTypeString();
};
