(function( $ ) {

window.TestHelpers = {};

function includeStyle( url ) {
	document.write( "<link rel='stylesheet' href='../../../" + url + "'>" );
}

function includeScript( url ) {
	document.write( "<script src='../../../" + url + "'></script>" );
}

QUnit.config.urlConfig.push( "min" );
TestHelpers.loadResources = QUnit.urlParams.min ?
	function() {
		// TODO: proper include with theme images
		includeStyle( "dist/jquery-ui.min.css" );
		includeScript( "dist/jquery-ui.min.js" );
	} :
	function( resources ) {
		$.each( resources.css || [], function( i, resource ) {
			includeStyle( "themes/base/jquery." + resource + ".css" );
		});
		$.each( resources.js || [], function( i, resource ) {
			includeScript( resource );
		});
	};

QUnit.config.urlConfig.push( "nojshint" );
function testJshint( widget ) {
	if ( QUnit.urlParams.nojshint ) {
		return;
	}

	includeScript( "external/jshint.js" );
	asyncTest( "JSHint", function() {
		expect( 1 );

		$.when(
			$.ajax({
				url: "../../../ui/.jshintrc",
				dataType: "json"
			}),
			$.ajax({
				url: "../../../ui/jquery.ui." + widget + ".js",
				dataType: "text"
			})
		).done(function( hintArgs, srcArgs ) {
			var passed = JSHINT( srcArgs[ 0 ], hintArgs[ 0 ] ),
				errors = $.map( JSHINT.errors, function( error ) {
					// JSHINT may report null if there are too many errors
					if ( !error ) {
						return;
					}

					return "[L" + error.line + ":C" + error.character + "] " +
						error.reason + "\n" + error.evidence + "\n";
				}).join( "\n" );
			ok( passed, errors );
			start();
		})
		.fail(function() {
			ok( false, "error loading source" );
			start();
		});
	});
}

function testWidgetDefaults( widget, defaults ) {
	var pluginDefaults = $.ui[ widget ].prototype.options;

	// ensure that all defaults have the correct value
	test( "defined defaults", function() {
		$.each( defaults, function( key, val ) {
			if ( $.isFunction( val ) ) {
				ok( $.isFunction( pluginDefaults[ key ] ), key );
				return;
			}
			deepEqual( pluginDefaults[ key ], val, key );
		});
	});

	// ensure that all defaults were tested
	test( "tested defaults", function() {
		$.each( pluginDefaults, function( key, val ) {
			ok( key in defaults, key );
		});
	});
}

function testWidgetOverrides( widget ) {
	if ( $.uiBackCompat === false ) {
		test( "$.widget overrides", function() {
			$.each([
				"_createWidget",
				"destroy",
				"option",
				"_trigger"
			], function( i, method ) {
				strictEqual( $.ui[ widget ].prototype[ method ],
					$.Widget.prototype[ method ], "should not override " + method );
			});
		});
	}
}

function testBasicUsage( widget ) {
	test( "basic usage", function() {
		var defaultElement = $.ui[ widget ].prototype.defaultElement;
		$( defaultElement ).appendTo( "body" )[ widget ]().remove();
		ok( true, "initialized on element" );

		$( defaultElement )[ widget ]().remove();
		ok( true, "initialized on disconnected DOMElement - never connected" );

		$( defaultElement ).appendTo( "body" ).remove()[ widget ]().remove();
		ok( true, "initialized on disconnected DOMElement - removed" );
	});
}

TestHelpers.commonWidgetTests = function( widget, settings ) {
	module( widget + ": common widget" );

	testJshint( widget );
	testWidgetDefaults( widget, settings.defaults );
	testWidgetOverrides( widget );
	testBasicUsage( widget );
	test( "version", function() {
		ok( "version" in $.ui[ widget ].prototype, "version property exists" );
	});
};

/*
 * Experimental assertion for comparing DOM objects.
 *
 * Serializes an element and some attributes and it's children if any, otherwise the text.
 * Then compares the result using deepEqual.
 */
window.domEqual = function( selector, modifier, message ) {
	var expected, actual,
		attributes = ["class", "role", "id", "tabIndex", "aria-activedescendant"];

	function extract(value) {
		if (!value || !value.length) {
			QUnit.push( false, actual, expected, "domEqual failed, can't extract " + selector + ", message was: " + message );
			return;
		}
		var children,
			result = {};
		result.nodeName = value[0].nodeName;
		$.each(attributes, function(index, attr) {
			result[attr] = value.prop(attr);
		});
		result.children = [];
		children = value.children();
		if (children.length) {
			children.each(function() {
				result.children.push(extract($(this)));
			});
		} else {
			result.text = value.text();
		}
		return result;
	}
	expected = extract( $( selector ) );
	modifier( $( selector ) );

	actual = extract( $( selector ) );
	QUnit.push( QUnit.equiv(actual, expected), actual, expected, message );
};

}( jQuery ));