( function () {
	QUnit.module( 'ext.echo.dm - mw.echo.dm.NotificationGroupsList' );

	QUnit.test( 'Constructing the model', function ( assert ) {
		var model = new mw.echo.dm.NotificationGroupsList();

		assert.strictEqual(
			model.getTimestamp(),
			0,
			'Empty group has timestamp 0'
		);
	} );

	QUnit.test( 'Managing lists', function ( assert ) {
		var i, group,
			model = new mw.echo.dm.NotificationGroupsList(),
			groupDefinitions = [
				{
					name: 'foo',
					sourceData: {
						title: 'Foo Wiki',
						base: 'http://foo.wiki.sample/$1'
					},
					items: [
						new mw.echo.dm.NotificationItem( 0 ),
						new mw.echo.dm.NotificationItem( 1 ),
						new mw.echo.dm.NotificationItem( 2 )
					]
				},
				{
					name: 'bar',
					sourceData: {
						title: 'Bar Wiki',
						base: 'http://bar.wiki.sample/$1'
					},
					items: [
						new mw.echo.dm.NotificationItem( 3 ),
						new mw.echo.dm.NotificationItem( 4 ),
						new mw.echo.dm.NotificationItem( 5 ),
						new mw.echo.dm.NotificationItem( 6 )
					]
				},
				{
					name: 'baz',
					sourceData: {
						title: 'Baz Wiki',
						base: 'http://baz.wiki.sample/$1'
					},
					items: [
						new mw.echo.dm.NotificationItem( 7 )
					]
				}
			];

		for ( i = 0; i < groupDefinitions.length; i++ ) {
			model.addGroup(
				groupDefinitions[ i ].name,
				groupDefinitions[ i ].sourceData,
				groupDefinitions[ i ].items
			);

			assert.strictEqual(
				model.getItemCount(),
				i + 1,
				'Group number increases after addGroup ("' + groupDefinitions[ i ].name + '")'
			);

			group = model.getGroupByName( groupDefinitions[ i ].name );
			assert.strictEqual(
				group.getName(),
				groupDefinitions[ i ].name,
				'Group exists after addGroup ("' + groupDefinitions[ i ].name + '")'
			);
		}

		// Remove group
		model.removeGroup( groupDefinitions[ 0 ].name );

		assert.strictEqual(
			model.getItemCount(),
			groupDefinitions.length - 1,
			'Group number decreased after removeGroup'
		);
		assert.strictEqual(
			model.getGroupByName( groupDefinitions[ 0 ] ),
			null,
			'Removed group is no longer in the list'
		);

		// Removing the last item from a group should remove the group
		group = model.getGroupByName( 'baz' );
		group.discardItems( groupDefinitions[ 2 ].items );
		assert.strictEqual(
			model.getGroupByName( 'baz' ),
			null,
			'Empty group is no longer in the list'
		);
	} );

	QUnit.test( 'Emitting discard event', function ( assert ) {
		var group,
			results = [],
			model = new mw.echo.dm.NotificationGroupsList(),
			groups = {
				first: [
					new mw.echo.dm.NotificationItem( 0 ),
					new mw.echo.dm.NotificationItem( 1 ),
					new mw.echo.dm.NotificationItem( 2 )
				],
				second: [
					new mw.echo.dm.NotificationItem( 3 ),
					new mw.echo.dm.NotificationItem( 4 ),
					new mw.echo.dm.NotificationItem( 5 )
				],
				third: [
					new mw.echo.dm.NotificationItem( 6 ),
					new mw.echo.dm.NotificationItem( 7 )
				],
				fourth: [
					new mw.echo.dm.NotificationItem( 8 ),
					new mw.echo.dm.NotificationItem( 9 )
				]
			};

		// Listen to the event
		model
			.on( 'discard', function ( group ) {
				results.push( group.getName() );
			} );

		// Fill the list
		for ( group in groups ) {
			model.addGroup( group, {}, groups[ group ] );
		}

		// Trigger events
		model.removeGroup( 'first' ); // [ 'first' ]
		model.removeGroup( 'fourth' ); // [ 'first', 'fourth' ]
		// Group doesn't exist, no change
		model.removeGroup( 'first' ); // [ 'first', 'fourth' ]
		// Discard of an item in a group (no event on the list model)
		model.getGroupByName( 'third' ).discardItems( groups.third[ 0 ] ); // [ 'first', 'fourth' ]
		// Discard of the last item in a group (trigger discard event on the list model)
		model.getGroupByName( 'third' ).discardItems( groups.third[ 1 ] ); // [ 'first', 'fourth', 'third' ]

		assert.deepEqual(
			// Actual
			results,
			// Expected:
			[ 'first', 'fourth', 'third' ],
			// Message
			'Discard events emitted'
		);
	} );

}() );