/*global define,Promise,describe,it,expect,beforeEach,waitsFor,jasmine*/

define(
    ["../src/TreeNodeController"],
    function (TreeNodeController) {
        "use strict";

        describe("The tree node controller", function () {
            var mockScope,
                mockTimeout,
                controller;

            function TestObject(id, context) {
                return {
                    getId: function () { return id; },
                    getCapability: function (key) {
                        return key === 'context' ? context : undefined;
                    }
                };
            }

            beforeEach(function () {
                mockScope = jasmine.createSpyObj("$scope", ["$watch", "$on"]);
                mockTimeout = jasmine.createSpy("$timeout");
                controller = new TreeNodeController(mockScope, mockTimeout);
            });

            it("allows tracking of expansion state", function () {
                // The tree node tracks whether or not it has ever
                // been expanded in order to lazily load the expanded
                // portion of the tree.
                expect(controller.hasBeenExpanded()).toBeFalsy();
                controller.trackExpansion();

                // Expansion is tracked on a timeout, because too
                // much expansion can result in an unstable digest.
                expect(mockTimeout).toHaveBeenCalled();
                mockTimeout.mostRecentCall.args[0]();

                expect(controller.hasBeenExpanded()).toBeTruthy();
                controller.trackExpansion();
                expect(controller.hasBeenExpanded()).toBeTruthy();
            });

            it("tracks whether or not the represented object is currently navigated-to", function () {
                // This is needed to highlight the current selection
                var mockContext = jasmine.createSpyObj(
                        "context",
                        [ "getParent", "getPath", "getRoot" ]
                    ),
                    obj = new TestObject("test-object", mockContext);

                mockContext.getPath.andReturn([obj]);

                // Verify precondition
                expect(controller.isSelected()).toBeFalsy();

                // Change the represented domain object
                mockScope.domainObject = obj;

                // Invoke the watch with the new selection
                mockScope.$watch.calls[0].args[1](obj);

                expect(controller.isSelected()).toBeTruthy();
            });

            it("expands a node if it is on the navigation path", function () {
                var mockParentContext = jasmine.createSpyObj(
                        "parentContext",
                        [ "getParent", "getPath", "getRoot" ]
                    ),
                    mockChildContext = jasmine.createSpyObj(
                        "childContext",
                        [ "getParent", "getPath", "getRoot" ]
                    ),
                    parent = new TestObject("parent", mockParentContext),
                    child = new TestObject("child", mockChildContext);

                mockChildContext.getParent.andReturn(parent);
                mockChildContext.getPath.andReturn([parent, child]);
                mockParentContext.getPath.andReturn([parent]);

                // Set up such that we are on, but not at the end of, a path
                mockScope.ngModel = { selectedObject: child };
                mockScope.domainObject = parent;
                mockScope.toggle = jasmine.createSpyObj("toggle", ["setState"]);

                // Invoke the watch with the new selection
                mockScope.$watch.calls[0].args[1](child);

                // Expansion is tracked on a timeout, because too
                // much expansion can result in an unstable digest.
                // Trigger that timeout.
                expect(mockTimeout).toHaveBeenCalled();
                mockTimeout.mostRecentCall.args[0]();

                expect(mockScope.toggle.setState).toHaveBeenCalledWith(true);
                expect(controller.hasBeenExpanded()).toBeTruthy();
                expect(controller.isSelected()).toBeFalsy();

            });

            it("does not expand a node if it is not on the navigation path", function () {
                var mockParentContext = jasmine.createSpyObj(
                        "parentContext",
                        [ "getParent", "getPath", "getRoot" ]
                    ),
                    mockChildContext = jasmine.createSpyObj(
                        "childContext",
                        [ "getParent", "getPath", "getRoot" ]
                    ),
                    parent = new TestObject("parent", mockParentContext),
                    child = new TestObject("child", mockChildContext);

                mockChildContext.getParent.andReturn(parent);
                mockChildContext.getPath.andReturn([child, child]);
                mockParentContext.getPath.andReturn([parent]);

                // Set up such that we are on, but not at the end of, a path
                mockScope.ngModel = { selectedObject: child };
                mockScope.domainObject = parent;
                mockScope.toggle = jasmine.createSpyObj("toggle", ["setState"]);

                // Invoke the watch with the new selection
                mockScope.$watch.calls[0].args[1](child);

                // Expansion is tracked on a timeout, because too
                // much expansion can result in an unstable digest.
                // We want to make sure no timeouts are pending here.
                expect(mockTimeout).not.toHaveBeenCalled();
                expect(controller.hasBeenExpanded()).toBeFalsy();
                expect(controller.isSelected()).toBeFalsy();
            });


            it("does not expand a node if no context is available", function () {
                var mockParentContext = jasmine.createSpyObj(
                        "parentContext",
                        [ "getParent", "getPath", "getRoot" ]
                    ),
                    mockChildContext = jasmine.createSpyObj(
                        "childContext",
                        [ "getParent", "getPath", "getRoot" ]
                    ),
                    parent = new TestObject("parent", mockParentContext),
                    child = new TestObject("child", undefined);

                mockChildContext.getParent.andReturn(parent);
                mockChildContext.getPath.andReturn([parent, child]);
                mockParentContext.getPath.andReturn([parent]);

                // Set up such that we are on, but not at the end of, a path
                mockScope.ngModel = { selectedObject: child };
                mockScope.domainObject = parent;
                mockScope.toggle = jasmine.createSpyObj("toggle", ["setState"]);

                // Invoke the watch with the new selection
                mockScope.$watch.calls[0].args[1](child);

                expect(mockScope.toggle.setState).not.toHaveBeenCalled();
                expect(controller.hasBeenExpanded()).toBeFalsy();
                expect(controller.isSelected()).toBeFalsy();

            });
        });
    }
);