QUnit.module( 'ext.echo.dm - FiltersModel' );

QUnit.test.each( 'Constructing the model', {
	'Empty config': {
		config: {},
		expected: {},
	},
	'Readstate: unread': {
		config: {
			readState: 'unread',
		},
		expected: {
			getReadState: 'unread',
		},
	},
	'Readstate: read': {
		config: {
			readState: 'read',
		},
		expected: {
			getReadState: 'read',
		},
	},
}, ( assert, data ) => {
	const defaultValues = {
		getReadState: 'all',
	};
	const expected = $.extend( true, {}, defaultValues, data.expected );

	const model = new mw.echo.dm.FiltersModel( data.config );

	for ( const method in expected ) {
		assert.deepEqual(
			// Run the method
			model[ method ](),
			// Expected value
			expected[ method ],
			// Message
			method,
		);
	}
} );

QUnit.test( 'Changing filters', ( assert ) => {
	const model = new mw.echo.dm.FiltersModel();

	assert.strictEqual(
		model.getReadState(),
		'all',
		'Initial value: all',
	);

	model.setReadState( 'unread' );
	assert.strictEqual(
		model.getReadState(),
		'unread',
		'Changing state (unread)',
	);

	model.setReadState( 'read' );
	assert.strictEqual(
		model.getReadState(),
		'read',
		'Changing state (read)',
	);

	model.setReadState( 'foo' );
	assert.strictEqual(
		model.getReadState(),
		'read',
		'Ignoring invalid state (foo)',
	);
} );

QUnit.test( '.setReadState() events', ( assert ) => {
	const results = [];
	const model = new mw.echo.dm.FiltersModel();

	// Listen to update event
	model.on( 'update', () => {
		results.push( model.getReadState() );
	} );

	// Trigger events
	model.setReadState( 'read' ); // [ 'read' ]
	model.setReadState( 'unread' ); // [ 'read', 'unread' ]
	model.setReadState( 'unread' ); // (no change, no event) [ 'read', 'unread' ]
	model.setReadState( 'all' ); // [ 'read', 'unread', 'all' ]
	model.setReadState( 'foo' ); // (invalid value, no event) [ 'read', 'unread', 'all' ]
	model.setReadState( 'unread' ); // [ 'read', 'unread', 'all', 'unread' ]

	assert.deepEqual(
		// Actual
		results,
		// Expected:
		[ 'read', 'unread', 'all', 'unread' ],
		// Message
		'Update events emitted',
	);
} );