/*****************************************************************************
 * Open MCT Web, Copyright (c) 2014-2015, United States Government
 * as represented by the Administrator of the National Aeronautics and Space
 * Administration. All rights reserved.
 *
 * Open MCT Web is licensed under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 * Open MCT Web includes source code licensed under additional open source
 * licenses. See the Open Source Licenses file (LICENSES.md) included with
 * this source code distribution or the Licensing information page available
 * at runtime from the About dialog for additional information.
 *****************************************************************************/

define(
    ["../../src/directives/MCTBackgroundImage"],
    function (MCTBackgroundImage) {

        describe("The mct-background-image directive", function () {
            var mockDocument,
                mockScope,
                mockElement,
                testImage,
                directive;

            beforeEach(function () {
                mockDocument = [
                    jasmine.createSpyObj('document', ['createElement'])
                ];
                mockScope = jasmine.createSpyObj('scope', ['$watch']);
                mockElement = jasmine.createSpyObj('element', ['css']);
                testImage = {};

                mockDocument[0].createElement.andReturn(testImage);

                directive = new MCTBackgroundImage(mockDocument);
            });

            it("is applicable as an attribute", function () {
                expect(directive.restrict).toEqual("A");
            });

            it("two-way-binds its own value", function () {
                expect(directive.scope.mctBackgroundImage).toEqual("=");
            });

            it("watches for changes to the URL", function () {
                directive.link(mockScope, mockElement, {});
                expect(mockScope.$watch).toHaveBeenCalledWith(
                    'mctBackgroundImage',
                    jasmine.any(Function)
                );
            });

            it("updates images in-order, even when they load out-of-order", function () {
                var firstOnload;

                directive.link(mockScope, mockElement);

                mockScope.$watch.mostRecentCall.args[1]("some/url/0");
                firstOnload = testImage.onload;

                mockScope.$watch.mostRecentCall.args[1]("some/url/1");

                // Resolve in a different order
                testImage.onload();
                firstOnload();

                // Should still have taken the more recent value
                expect(mockElement.css.mostRecentCall.args).toEqual([
                    "background-image",
                    "url('some/url/1')"
                ]);
            });

            it("clears the background image when undefined is passed in", function () {
                directive.link(mockScope, mockElement);

                mockScope.$watch.mostRecentCall.args[1]("some/url/0");
                testImage.onload();
                mockScope.$watch.mostRecentCall.args[1](undefined);

                expect(mockElement.css.mostRecentCall.args).toEqual([
                    "background-image",
                    "none"
                ]);
            });
        });
    }
);