describe('gridstack engine', function() {
    'use strict';

    var e;
    var w;

    beforeEach(function() {
        w = window;
        e = w.GridStackUI.Engine;
    });

    describe('test constructor', function() {
        var engine;

        beforeAll(function() {
            engine = new GridStackUI.Engine(12);
        });

        it('should be setup properly', function() {
            expect(engine.width).toEqual(12);
            expect(engine.float).toEqual(false);
            expect(engine.height).toEqual(0);
            expect(engine.nodes).toEqual([]);
        });
    });

    describe('test _prepareNode', function() {
        var engine;

        beforeAll(function() {
            engine = new GridStackUI.Engine(12);
        });

        it('should prepare a node', function() {
            expect(engine._prepareNode({}, false)).toEqual(jasmine.objectContaining({x: 0, y: 0, width: 1, height: 1}));
            expect(engine._prepareNode({x: 10}, false)).toEqual(jasmine.objectContaining({x: 10, y: 0, width: 1, height: 1}));
            expect(engine._prepareNode({x: -10}, false)).toEqual(jasmine.objectContaining({x: 0, y: 0, width: 1, height: 1}));
            expect(engine._prepareNode({y: 10}, false)).toEqual(jasmine.objectContaining({x: 0, y: 10, width: 1, height: 1}));
            expect(engine._prepareNode({y: -10}, false)).toEqual(jasmine.objectContaining({x: 0, y: 0, width: 1, height: 1}));
            expect(engine._prepareNode({width: 3}, false)).toEqual(jasmine.objectContaining({x: 0, y: 0, width: 3, height: 1}));
            expect(engine._prepareNode({width: 100}, false)).toEqual(jasmine.objectContaining({x: 0, y: 0, width: 12, height: 1}));
            expect(engine._prepareNode({width: 0}, false)).toEqual(jasmine.objectContaining({x: 0, y: 0, width: 1, height: 1}));
            expect(engine._prepareNode({width: -190}, false)).toEqual(jasmine.objectContaining({x: 0, y: 0, width: 1, height: 1}));
            expect(engine._prepareNode({height: 3}, false)).toEqual(jasmine.objectContaining({x: 0, y: 0, width: 1, height: 3}));
            expect(engine._prepareNode({height: 0}, false)).toEqual(jasmine.objectContaining({x: 0, y: 0, width: 1, height: 1}));
            expect(engine._prepareNode({height: -10}, false)).toEqual(jasmine.objectContaining({x: 0, y: 0, width: 1, height: 1}));
            expect(engine._prepareNode({x: 4, width: 10}, false)).toEqual(jasmine.objectContaining({x: 2, y: 0, width: 10, height: 1}));
            expect(engine._prepareNode({x: 4, width: 10}, true)).toEqual(jasmine.objectContaining({x: 4, y: 0, width: 8, height: 1}));
        });
    });

    describe('test isAreaEmpty', function() {
        var engine;

        beforeAll(function() {
            engine = new GridStackUI.Engine(12, null, true);
            engine.nodes = [
                engine._prepareNode({x: 3, y: 2, width: 3, height: 2})
            ];
        });

        it('should be true', function() {
            expect(engine.isAreaEmpty(0, 0, 3, 2)).toEqual(true);
            expect(engine.isAreaEmpty(3, 4, 3, 2)).toEqual(true);
        });

        it('should be false', function() {
            expect(engine.isAreaEmpty(1, 1, 3, 2)).toEqual(false);
            expect(engine.isAreaEmpty(2, 3, 3, 2)).toEqual(false);
        });
    });

    describe('test cleanNodes/getDirtyNodes', function() {
        var engine;

        beforeAll(function() {
            engine = new GridStackUI.Engine(12, null, true);
            engine.nodes = [
                engine._prepareNode({x: 0, y: 0, width: 1, height: 1, idx: 1, _dirty: true}),
                engine._prepareNode({x: 3, y: 2, width: 3, height: 2, idx: 2, _dirty: true}),
                engine._prepareNode({x: 3, y: 7, width: 3, height: 2, idx: 3})
            ];
        });

        beforeEach(function() {
            engine._updateCounter = 0;
        });

        it('should return all dirty nodes', function() {
            var nodes = engine.getDirtyNodes();

            expect(nodes.length).toEqual(2);
            expect(nodes[0].idx).toEqual(1);
            expect(nodes[1].idx).toEqual(2);
        });

        it('should\'n clean nodes if _updateCounter > 0', function() {
            engine._updateCounter = 1;
            engine.cleanNodes();

            expect(engine.getDirtyNodes().length).toBeGreaterThan(0);
        });

        it('should clean all dirty nodes', function() {
            engine.cleanNodes();

            expect(engine.getDirtyNodes().length).toEqual(0);
        });
    });

    describe('test batchUpdate/commit', function() {
        var engine;

        beforeAll(function() {
            engine = new GridStackUI.Engine(12);
        });

        it('should work on not float grids', function() {
            expect(engine.float).toEqual(false);
            engine.batchUpdate();
            expect(engine._updateCounter).toBeGreaterThan(0);
            expect(engine.float).toEqual(true);
            engine.commit();
            expect(engine._updateCounter).toEqual(0);
            expect(engine.float).toEqual(false);
        });
    });

    describe('test batchUpdate/commit', function() {
        var engine;

        beforeAll(function() {
            engine = new GridStackUI.Engine(12, null, true);
        });

        it('should work on float grids', function() {
            expect(engine.float).toEqual(true);
            engine.batchUpdate();
            expect(engine._updateCounter).toBeGreaterThan(0);
            expect(engine.float).toEqual(true);
            engine.commit();
            expect(engine._updateCounter).toEqual(0);
            expect(engine.float).toEqual(true);
        });
    });

    describe('test _notify', function() {
        var engine;
        var spy;

        beforeEach(function() {
            spy = {
                callback: function() {}
            };
            spyOn(spy, 'callback');

            engine = new GridStackUI.Engine(12, spy.callback, true);

            engine.nodes = [
                engine._prepareNode({x: 0, y: 0, width: 1, height: 1, idx: 1, _dirty: true}),
                engine._prepareNode({x: 3, y: 2, width: 3, height: 2, idx: 2, _dirty: true}),
                engine._prepareNode({x: 3, y: 7, width: 3, height: 2, idx: 3})
            ];
        });

        it('should\'n be called if _updateCounter > 0', function() {
            engine._updateCounter = 1;
            engine._notify();

            expect(spy.callback).not.toHaveBeenCalled();
        });

        it('should by called with dirty nodes', function() {
            engine._notify();

            expect(spy.callback).toHaveBeenCalledWith([
                engine.nodes[0],
                engine.nodes[1]
            ], true);
        });

        it('should by called with extra passed node to be removed', function() {
            var n1 = {idx: -1};

            engine._notify(n1);

            expect(spy.callback).toHaveBeenCalledWith([
                n1,
                engine.nodes[0],
                engine.nodes[1]
            ], true);
        });

        it('should by called with extra passed node to be removed and should maintain false parameter', function() {
            var n1 = {idx: -1};

            engine._notify(n1, false);

            expect(spy.callback).toHaveBeenCalledWith([
                n1,
                engine.nodes[0],
                engine.nodes[1]
            ], false);
        });
    });

    describe('test _packNodes', function() {
        describe('using not float mode', function() {
            var engine;

            var findNode = function(engine, id) {
                return _.find(engine.nodes, function(i) { return i._id === id; });
            };

            beforeEach(function() {
                engine = new GridStackUI.Engine(12, null, false);
            });

            it('shouldn\'t pack one node with y coord eq 0', function() {
                engine.nodes = [
                    {x: 0, y: 0, width: 1, height: 1, _id: 1},
                ];

                engine._packNodes();

                expect(findNode(engine, 1)).toEqual(jasmine.objectContaining({x: 0, y: 0, width: 1, height: 1}));
                expect(findNode(engine, 1)._dirty).toBeFalsy();
            });

            it('should pack one node correctly', function() {
                engine.nodes = [
                    {x: 0, y: 1, width: 1, height: 1, _id: 1},
                ];

                engine._packNodes();

                expect(findNode(engine, 1)).toEqual(jasmine.objectContaining({x: 0, y: 0, width: 1, height: 1, _dirty: true}));
            });

            it('should pack nodes correctly', function() {
                engine.nodes = [
                    {x: 0, y: 1, width: 1, height: 1, _id: 1},
                    {x: 0, y: 5, width: 1, height: 1, _id: 2},
                ];

                engine._packNodes();

                expect(findNode(engine, 1)).toEqual(jasmine.objectContaining({x: 0, y: 0, width: 1, height: 1, _dirty: true}));
                expect(findNode(engine, 2)).toEqual(jasmine.objectContaining({x: 0, y: 1, width: 1, height: 1, _dirty: true}));
            });

            it('should pack nodes correctly', function() {
                engine.nodes = [
                    {x: 0, y: 5, width: 1, height: 1, _id: 1},
                    {x: 0, y: 1, width: 1, height: 1, _id: 2},
                ];

                engine._packNodes();

                expect(findNode(engine, 2)).toEqual(jasmine.objectContaining({x: 0, y: 0, width: 1, height: 1, _dirty: true}));
                expect(findNode(engine, 1)).toEqual(jasmine.objectContaining({x: 0, y: 1, width: 1, height: 1, _dirty: true}));
            });

            it('should respect locked nodes', function() {
                engine.nodes = [
                    {x: 0, y: 1, width: 1, height: 1, _id: 1, locked: true},
                    {x: 0, y: 5, width: 1, height: 1, _id: 2},
                ];

                engine._packNodes();

                expect(findNode(engine, 1)).toEqual(jasmine.objectContaining({x: 0, y: 1, width: 1, height: 1}));
                expect(findNode(engine, 1)._dirty).toBeFalsy();
                expect(findNode(engine, 2)).toEqual(jasmine.objectContaining({x: 0, y: 2, width: 1, height: 1, _dirty: true}));
            });
        });
    });

    describe('test isNodeChangedPosition', function() {
        var engine;

        beforeAll(function() {
            engine = new GridStackUI.Engine(12);
        });

        it('should return true for changed x', function() {
            var widget = { x: 1, y: 2, width: 3, height: 4 };
            expect(engine.isNodeChangedPosition(widget, 2, 2)).toEqual(true);
        });

        it('should return true for changed y', function() {
            var widget = { x: 1, y: 2, width: 3, height: 4 };
            expect(engine.isNodeChangedPosition(widget, 1, 1)).toEqual(true);
        });

        it('should return true for changed width', function() {
            var widget = { x: 1, y: 2, width: 3, height: 4 };
            expect(engine.isNodeChangedPosition(widget, 2, 2, 4, 4)).toEqual(true);
        });

        it('should return true for changed height', function() {
            var widget = { x: 1, y: 2, width: 3, height: 4 };
            expect(engine.isNodeChangedPosition(widget, 1, 2, 3, 3)).toEqual(true);
        });

        it('should return false for unchanged position', function() {
            var widget = { x: 1, y: 2, width: 3, height: 4 };
            expect(engine.isNodeChangedPosition(widget, 1, 2, 3, 4)).toEqual(false);
        });
    });
});