( function () {
	var defaultValues = {
		getAllItemIds: [],
		getAllItemIdsByType: [],
		getTitle: '',
		getName: 'local',
		getSource: 'local',
		getSourceURL: '',
		getTimestamp: 0,
		getCount: 0,
		hasUnseen: false,
		isForeign: false
	};

	QUnit.module( 'ext.echo.dm - mw.echo.dm.NotificationsList' );

	QUnit.test( 'Constructing the model', function ( assert ) {
		var i, model, method,
			cases = [
				{
					msg: 'Empty config',
					config: {},
					expected: defaultValues
				},
				{
					msg: 'Prefilled data',
					config: {
						title: 'Some title',
						name: 'local_demo',
						source: 'hewiki',
						sourceURL: 'http://he.wiki.local.wmftest.net:8080/wiki/$1',
						timestamp: '20160916171300'
					},
					expected: $.extend( true, {}, defaultValues, {
						getTitle: 'Some title',
						getName: 'local_demo',
						getSource: 'hewiki',
						getSourceURL: 'http://he.wiki.local.wmftest.net:8080/wiki/$1',
						getTimestamp: '20160916171300',
						isForeign: true
					} )
				}
			];

		for ( i = 0; i < cases.length; i++ ) {
			model = new mw.echo.dm.NotificationsList( cases[ i ].config );

			for ( method in cases[ i ].expected ) {
				assert.deepEqual(
					// Run the method
					model[ method ](),
					// Expected value
					cases[ i ].expected[ method ],
					// Message
					cases[ i ].msg + ' (' + method + ')'
				);
			}
		}
	} );

	QUnit.test( 'Handling notification items', function ( assert ) {
		var model = new mw.echo.dm.NotificationsList( { timestamp: '200101010000' } ),
			items = [
				new mw.echo.dm.NotificationItem( 0, { type: 'alert', timestamp: '201609190000', read: false, seen: false } ),
				new mw.echo.dm.NotificationItem( 1, { type: 'message', timestamp: '201609190100', read: false, seen: true } ),
				new mw.echo.dm.NotificationItem( 2, { type: 'alert', timestamp: '201609190200', read: true, seen: true } ),
				new mw.echo.dm.NotificationItem( 3, { type: 'message', timestamp: '201609190300', read: true, seen: true } ),
				new mw.echo.dm.NotificationItem( 4, { type: 'alert', timestamp: '201609190400', read: true, seen: true } ),
				new mw.echo.dm.NotificationItem( 5, { type: 'message', timestamp: '201609190500', read: true, seen: false } )
			];

		assert.strictEqual(
			model.getCount(),
			0,
			'Model list starts empty'
		);
		assert.strictEqual(
			model.getTimestamp(),
			'200101010000',
			'Model timestamp is its default'
		);

		model.setItems( items );
		assert.strictEqual(
			model.getCount(),
			6,
			'Item list setup'
		);
		assert.strictEqual(
			model.getTimestamp(),
			'201609190100',
			'Model timestamp is the latest unread item\'s timestamp'
		);
		assert.deepEqual(
			model.getAllItemIds(),
			[ 1, 0, 5, 4, 3, 2 ],
			'getAllItemIds (sorted)'
		);
		assert.deepEqual(
			[
				model.getAllItemIdsByType( 'alert' ),
				model.getAllItemIdsByType( 'message' )
			],
			[
				[ 0, 4, 2 ],
				[ 1, 5, 3 ]
			],
			'getAllItemIdsByType (sorted)'
		);
		assert.deepEqual(
			model.findByIds( [ 1, 2 ] ),
			[ items[ 1 ], items[ 2 ] ],
			'findByIds'
		);

		// Change item state (trigger resort)
		items[ 1 ].toggleRead( true );
		items[ 3 ].toggleRead( false );
		items[ 5 ].toggleSeen( true ); // Will not affect sorting order of the item
		assert.deepEqual(
			model.getAllItemIds(),
			[ 3, 0, 5, 4, 2, 1 ],
			'getAllItemIds (re-sorted)'
		);

		// Discard items
		model.discardItems( [ items[ 5 ], items[ 2 ] ] );

		assert.deepEqual(
			model.getAllItemIds(),
			[ 3, 0, 4, 1 ],
			'getAllItemIds (discarded items)'
		);
		assert.deepEqual(
			[
				model.getAllItemIdsByType( 'alert' ),
				model.getAllItemIdsByType( 'message' )
			],
			[
				[ 0, 4 ],
				[ 3, 1 ]
			],
			'getAllItemIdsByType (discarded items)'
		);

	} );

	QUnit.test( 'Intercepting events', function ( assert ) {
		var model = new mw.echo.dm.NotificationsList(),
			result = [],
			items = [
				new mw.echo.dm.NotificationItem( 0, { timestamp: '201609190000', read: false, seen: false } ),
				new mw.echo.dm.NotificationItem( 1, { timestamp: '201609190100', read: false, seen: true } ),
				new mw.echo.dm.NotificationItem( 2, { timestamp: '201609190200', read: true, seen: true } ),
				new mw.echo.dm.NotificationItem( 3, { timestamp: '201609190300', read: true, seen: true } ),
				new mw.echo.dm.NotificationItem( 4, { timestamp: '201609190400', read: true, seen: true } ),
				new mw.echo.dm.NotificationItem( 5, { timestamp: '201609190500', read: true, seen: true } )
			];

		// Listen to events
		model
			.on( 'update', function ( itms ) {
				result.push( 'update:' + itms.length );
			} )
			.on( 'discard', function ( item ) {
				result.push( 'discard:' + item.getId() );
			} )
			.on( 'itemUpdate', function ( item ) {
				result.push( 'itemUpdate:' + item.getId() );
			} );

		// Set up and trigger events
		model
			.setItems( items ); // [ 'update:6' ]
		model.discardItems( items[ items.length - 1 ] ); // [ 'update:6', 'discard:5' ]
		items[ 0 ].toggleSeen( true ); // [ 'update:6', 'discard:5', 'itemUpdate:0' ]
		items[ 1 ].toggleRead( true ); // [ 'update:6', 'discard:5', 'itemUpdate:0', 'itemUpdate:1' ]

		assert.deepEqual(
			// Actual
			result,
			// Expected:
			[ 'update:6', 'discard:5', 'itemUpdate:0', 'itemUpdate:1' ],
			// Message
			'Events emitted correctly'
		);
	} );

}() );