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 * 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.
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 * License for the specific language governing permissions and limitations
 * under the License.
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/**
 * MutationCapabilitySpec. Created by vwoeltje on 11/6/14.
 */
define(
    [
        "../../src/capabilities/MutationCapability",
        "../../src/services/Topic"
    ],
    function (MutationCapability, Topic) {

        describe("The mutation capability", function () {
            var testModel,
                topic,
                mockNow,
                domainObject = {
                    getId: function () { return "test-id"; },
                    getModel: function () { return testModel; }
                },
                mutation;

            beforeEach(function () {
                testModel = { number: 6 };
                topic = new Topic();
                mockNow = jasmine.createSpy('now');
                mockNow.andReturn(12321);
                mutation = new MutationCapability(
                    topic,
                    mockNow,
                    domainObject
                );
            });

            it("allows mutation of a model", function () {
                mutation.invoke(function (m) {
                    m.number = m.number * 7;
                });
                expect(testModel.number).toEqual(42);
            });

            it("allows setting a model", function () {
                mutation.invoke(function () {
                    return { someKey: "some value" };
                });
                expect(testModel.number).toBeUndefined();
                expect(testModel.someKey).toEqual("some value");
            });

            it("allows model mutation to be aborted", function () {
                mutation.invoke(function (m) {
                    m.number = m.number * 7;
                    return false; // Should abort change
                });
                // Number should not have been changed
                expect(testModel.number).toEqual(6);
            });

            it("attaches a timestamp on mutation", function () {
                // Verify precondition
                expect(testModel.modified).toBeUndefined();
                mutation.invoke(function (m) {
                    m.number = m.number * 7;
                });
                // Should have gotten a timestamp from 'now'
                expect(testModel.modified).toEqual(12321);
            });

            it("allows a timestamp to be provided", function () {
                mutation.invoke(function (m) {
                    m.number = m.number * 7;
                }, 42);
                // Should have gotten a timestamp from 'now'
                expect(testModel.modified).toEqual(42);
            });

            it("notifies listeners of mutation", function () {
                var mockCallback = jasmine.createSpy('callback');
                mutation.listen(mockCallback);
                mutation.invoke(function (m) {
                    m.number = 8;
                });
                expect(mockCallback).toHaveBeenCalled();
                expect(mockCallback.mostRecentCall.args[0].number)
                    .toEqual(8);
            });

            it("allows listeners to stop listening", function () {
                var mockCallback = jasmine.createSpy('callback');
                mutation.listen(mockCallback)(); // Unlisten immediately
                mutation.invoke(function (m) {
                    m.number = 8;
                });
                expect(mockCallback).not.toHaveBeenCalled();
            });

            it("shares listeners across instances", function () {
                var mockCallback = jasmine.createSpy('callback'),
                    otherMutation = new MutationCapability(
                        topic,
                        mockNow,
                        domainObject
                    );
                mutation.listen(mockCallback);
                otherMutation.invoke(function (m) {
                    m.number = 8;
                });
                expect(mockCallback).toHaveBeenCalled();
                expect(mockCallback.mostRecentCall.args[0].number)
                    .toEqual(8);
            });
        });
    }
);