defineSuite([
        'Scene/CameraFlightPath',
        'Core/Cartesian3',
        'Core/Cartographic',
        'Core/Math',
        'Core/OrthographicOffCenterFrustum',
        'Scene/SceneMode',
        'Specs/createScene'
    ], function(
        CameraFlightPath,
        Cartesian3,
        Cartographic,
        CesiumMath,
        OrthographicOffCenterFrustum,
        SceneMode,
        createScene) {
    'use strict';

    var scene;

    beforeEach(function() {
        scene = createScene();
    });

    afterEach(function() {
        scene.destroyForSpecs();
    });

    function createOrthographicFrustum() {
        var current = scene.camera.frustum;
        var f = new OrthographicOffCenterFrustum();
        f.near = current.near;
        f.far = current.far;

        var tanTheta = Math.tan(0.5 * current.fovy);
        f.top = f.near * tanTheta;
        f.bottom = -f.top;
        f.right = current.aspectRatio * f.top;
        f.left = -f.right;

        return f;
    }

    it('create animation throws without a scene', function() {
        expect(function() {
            CameraFlightPath.createTween(undefined, {
                destination : new Cartesian3(1e9, 1e9, 1e9)
            });
        }).toThrowDeveloperError();
    });

    it('create animation throws without a destination', function() {
        expect(function() {
            CameraFlightPath.createTween(scene, {});
        }).toThrowDeveloperError();
    });

    it('creates an animation', function() {
        var destination = new Cartesian3(1e9, 1e9, 1e9);
        var duration = 5.0;
        var complete = function() {
        };
        var cancel = function() {
        };

        var flight = CameraFlightPath.createTween(scene, {
            destination : destination,
            duration : duration,
            complete : complete,
            cancel: cancel
        });

        expect(flight.duration).toEqual(duration);
        expect(typeof flight.complete).toEqual('function');
        expect(typeof flight.cancel).toEqual('function');
        expect(typeof flight.update).toEqual('function');
        expect(flight.startObject).toBeDefined();
        expect(flight.stopObject).toBeDefined();
        expect(flight.easingFunction).toBeDefined();
    });

    it('creates an animation in 3d', function() {
        var camera = scene.camera;

        var startPosition = Cartesian3.clone(camera.position);
        var startHeading = camera.heading;
        var startPitch = camera.pitch;
        var startRoll = camera.roll;

        var endPosition = Cartesian3.negate(startPosition, new Cartesian3());
        var endHeading = CesiumMath.toRadians(20.0);
        var endPitch = CesiumMath.toRadians(-45.0);
        var endRoll = CesiumMath.TWO_PI;

        var duration = 5.0;
        var flight = CameraFlightPath.createTween(scene, {
            destination : endPosition,
            heading : endHeading,
            pitch : endPitch,
            roll : endRoll,
            duration : duration
        });

        flight.update({ time : 0.0 });
        expect(camera.position).toEqualEpsilon(startPosition, CesiumMath.EPSILON12);
        expect(camera.heading).toEqualEpsilon(startHeading, CesiumMath.EPSILON12);
        expect(camera.pitch).toEqualEpsilon(startPitch, CesiumMath.EPSILON12);
        expect(camera.roll).toEqualEpsilon(startRoll, CesiumMath.EPSILON12);

        flight.update({ time : duration });
        expect(camera.position).toEqualEpsilon(endPosition, CesiumMath.EPSILON12);
        expect(camera.heading).toEqualEpsilon(endHeading, CesiumMath.EPSILON12);
        expect(camera.pitch).toEqualEpsilon(endPitch, CesiumMath.EPSILON12);
        expect(camera.roll).toEqualEpsilon(endRoll, CesiumMath.EPSILON12);
    });

    it('creates an animation in Columbus view', function() {
        scene._mode = SceneMode.COLUMBUS_VIEW;
        var camera = scene.camera;

        camera.position = new Cartesian3(0.0, 0.0, 1000.0);
        camera.direction = Cartesian3.negate(Cartesian3.UNIT_Z, new Cartesian3());
        camera.up = Cartesian3.clone(Cartesian3.UNIT_Y);
        camera.right = Cartesian3.cross(camera.direction, camera.up, new Cartesian3());

        var startPosition = Cartesian3.clone(camera.position);

        var projection = scene.mapProjection;
        var destination = Cartesian3.add(startPosition, new Cartesian3(-6e5 * Math.PI, 6e5 * CesiumMath.PI_OVER_FOUR, 100.0), new Cartesian3());
        var endPosition = projection.ellipsoid.cartographicToCartesian(projection.unproject(destination));

        var duration = 5.0;
        var flight = CameraFlightPath.createTween(scene, {
            destination : endPosition,
            duration : duration
        });

        flight.update({ time : 0.0 });
        expect(camera.position).toEqualEpsilon(startPosition, CesiumMath.EPSILON12);

        flight.update({ time : duration });
        expect(camera.position).toEqualEpsilon(destination, CesiumMath.EPSILON4);
    });

    it('creates an animation in 2D', function() {
        scene._mode = SceneMode.SCENE2D;
        var camera = scene.camera;

        camera.position = new Cartesian3(0.0, 0.0, 1000.0);
        camera.direction = Cartesian3.negate(Cartesian3.UNIT_Z, new Cartesian3());
        camera.up = Cartesian3.clone(Cartesian3.UNIT_Y);
        camera.right = Cartesian3.cross(camera.direction, camera.up, new Cartesian3());
        camera.frustum = createOrthographicFrustum();

        var startHeight = camera.frustum.right - camera.frustum.left;
        var startPosition = Cartesian3.clone(camera.position);

        var projection = scene.mapProjection;
        var destination = Cartesian3.add(startPosition, new Cartesian3(-6e6 * Math.PI, 6e6 * CesiumMath.PI_OVER_FOUR, 100.0), new Cartesian3());
        var endPosition = projection.ellipsoid.cartographicToCartesian(projection.unproject(destination));

        var duration = 5.0;
        var flight = CameraFlightPath.createTween(scene, {
            destination : endPosition,
            duration : duration
        });

        flight.update({ time : 0.0 });
        expect(camera.position).toEqualEpsilon(startPosition, CesiumMath.EPSILON12);
        expect(camera.frustum.right - camera.frustum.left).toEqualEpsilon(startHeight, CesiumMath.EPSILON7);

        flight.update({ time : duration });
        expect(camera.position.x).toEqualEpsilon(destination.x, CesiumMath.EPSILON7);
        expect(camera.position.y).toEqualEpsilon(destination.y, CesiumMath.EPSILON7);
        expect(camera.position.z).toEqualEpsilon(startPosition.z, CesiumMath.EPSILON7);
        expect(camera.frustum.right - camera.frustum.left).toEqualEpsilon(destination.z, CesiumMath.EPSILON7);
    });

    it('creates a path where the start and end points only differ in height', function() {
        var camera = scene.camera;
        var start = Cartesian3.clone(camera.position);
        var mag = Cartesian3.magnitude(start);
        var end = Cartesian3.multiplyByScalar(Cartesian3.normalize(start, new Cartesian3()), mag - 1000000.0, new Cartesian3());

        var duration = 3.0;
        var flight = CameraFlightPath.createTween(scene, {
            destination : end,
            duration : duration
        });

        flight.update({ time : 0.0 });
        expect(camera.position).toEqualEpsilon(start, CesiumMath.EPSILON12);

        flight.update({ time : duration });
        expect(camera.position).toEqualEpsilon(end, CesiumMath.EPSILON12);
    });

    it('does not create a path to the same point', function() {
        var camera = scene.camera;
        camera.position = new Cartesian3(7000000.0, 0.0, 0.0);

        var startPosition = Cartesian3.clone(camera.position);
        var startHeading= camera.heading;
        var startPitch = camera.pitch;
        var startRoll = camera.roll;

        var duration = 3.0;
        var flight = CameraFlightPath.createTween(scene, {
            destination : startPosition,
            heading : startHeading,
            pitch : startPitch,
            roll: startRoll,
            duration : duration
        });

        expect(flight.duration).toEqual(0);
        expect(camera.position).toEqual(startPosition);
        expect(camera.heading).toEqual(startHeading);
        expect(camera.pitch).toEqual(startPitch);
        expect(camera.roll).toEqual(startRoll);
    });

    it('creates an animation with 0 duration', function() {
        var destination = new Cartesian3(1e9, 1e9, 1e9);
        var duration = 0.0;
        var complete = function() {
            return true;
        };

        var flight = CameraFlightPath.createTween(scene, {
            destination : destination,
            duration : duration,
            complete : complete
        });

        expect(flight.duration).toEqual(duration);
        expect(flight.complete).not.toEqual(complete);
        expect(flight.update).toBeUndefined();
        expect(scene.camera.position).not.toEqual(destination);
        flight.complete();
        expect(scene.camera.position).toEqualEpsilon(destination, CesiumMath.EPSILON14);
    });

    it('duration is 0 when destination is the same as camera position in 2D', function() {
        scene._mode = SceneMode.SCENE2D;
        var camera = scene.camera;

        camera.position = new Cartesian3(0.0, 0.0, 1000.0);
        camera.direction = Cartesian3.negate(Cartesian3.UNIT_Z, new Cartesian3());
        camera.up = Cartesian3.clone(Cartesian3.UNIT_Y);
        camera.right = Cartesian3.cross(camera.direction, camera.up, new Cartesian3());
        camera.frustum = createOrthographicFrustum();
        camera.update(scene.mode);
        var frustum = camera.frustum;
        var destination = Cartesian3.clone(camera.position);
        destination.z = Math.max(frustum.right - frustum.left, frustum.top - frustum.bottom);

        var projection = scene.mapProjection;
        var endPosition = projection.ellipsoid.cartographicToCartesian(projection.unproject(destination));

        var flight = CameraFlightPath.createTween(scene, {
            destination : endPosition
        });

        expect(flight.duration).toEqual(0.0);
    });

    it('duration is 0 when destination is the same as camera position in 3D', function() {
        scene._mode = SceneMode.SCENE3D;
        var camera = scene.camera;

        camera.position = new Cartesian3(0.0, 0.0, 1000.0);
        camera.setView({
            orientation: {
                heading: 0,
                pitch: -CesiumMath.PI_OVER_TWO,
                roll: 0
            }
        });
        camera.frustum = createOrthographicFrustum();

        var flight = CameraFlightPath.createTween(scene, {
            destination : camera.position
        });

        expect(flight.duration).toEqual(0.0);
    });

    it('duration is 0 when destination is the same as camera position in CV', function() {
        scene._mode = SceneMode.COLUMBUS_VIEW;
        var camera = scene.camera;

        camera.position = new Cartesian3(0.0, 0.0, 1000.0);
        camera.setView({
            orientation: {
                heading: 0,
                pitch: -CesiumMath.PI_OVER_TWO,
                roll: 0
            }
        });

        var projection = scene.mapProjection;
        var endPosition = projection.ellipsoid.cartographicToCartesian(projection.unproject(camera.position));

        var flight = CameraFlightPath.createTween(scene, {
            destination : endPosition
        });

        expect(flight.duration).toEqual(0.0);
    });

    it('creates an animation in 2D 0 duration', function() {
        scene._mode = SceneMode.SCENE2D;
        var camera = scene.camera;

        camera.position = new Cartesian3(0.0, 0.0, 1000.0);
        camera.direction = Cartesian3.negate(Cartesian3.UNIT_Z, new Cartesian3());
        camera.up = Cartesian3.clone(Cartesian3.UNIT_Y);
        camera.right = Cartesian3.cross(camera.direction, camera.up, new Cartesian3());
        camera.frustum = createOrthographicFrustum();

        camera.update(scene.mode);

        var startPosition = Cartesian3.clone(camera.position);

        var projection = scene.mapProjection;
        var destination = Cartesian3.add(startPosition, new Cartesian3(-6e5 * Math.PI, 6e5 * CesiumMath.PI_OVER_FOUR, 100.0), new Cartesian3());
        var endPosition = projection.ellipsoid.cartographicToCartesian(projection.unproject(destination));

        var flight = CameraFlightPath.createTween(scene, {
            destination : endPosition,
            duration : 0.0
        });

        expect(typeof flight.complete).toEqual('function');
        flight.complete();
        expect(camera.position.x).toEqualEpsilon(destination.x, CesiumMath.EPSILON7);
        expect(camera.position.y).toEqualEpsilon(destination.y, CesiumMath.EPSILON7);
        expect(camera.frustum.right - camera.frustum.left).toEqualEpsilon(destination.z, CesiumMath.EPSILON7);
    });

    it('creates an animation in Columbus view 0 duration', function() {
        scene._mode = SceneMode.COLUMBUS_VIEW;
        var camera = scene.camera;

        camera.position = new Cartesian3(0.0, 0.0, 1000.0);
        camera.direction = Cartesian3.negate(Cartesian3.UNIT_Z, new Cartesian3());
        camera.up = Cartesian3.clone(Cartesian3.UNIT_Y);
        camera.right = Cartesian3.cross(camera.direction, camera.up, new Cartesian3());

        var startPosition = Cartesian3.clone(camera.position);

        var projection = scene.mapProjection;
        var destination = Cartesian3.add(startPosition, new Cartesian3(-6e6 * Math.PI, 6e6 * CesiumMath.PI_OVER_FOUR, 100.0), new Cartesian3());
        var endPosition = projection.ellipsoid.cartographicToCartesian(projection.unproject(destination));

        var flight = CameraFlightPath.createTween(scene, {
            destination : endPosition,
            duration : 0.0
        });

        expect(typeof flight.complete).toEqual('function');
        flight.complete();
        expect(camera.position).toEqualEpsilon(destination, CesiumMath.EPSILON8);
    });

    it('creates an animation in 3d 0 duration', function() {
        var camera = scene.camera;

        var startPosition = Cartesian3.clone(camera.position);
        var endPosition = Cartesian3.negate(startPosition, new Cartesian3());

        var flight = CameraFlightPath.createTween(scene, {
            destination : endPosition,
            duration : 0.0
        });

        expect(typeof flight.complete).toEqual('function');
        flight.complete();
        expect(camera.position).toEqualEpsilon(endPosition, CesiumMath.EPSILON12);
    });

    it('creates animation to hit flyOverLongitude', function() {
        var camera = scene.camera;
        var projection = scene.mapProjection;
        var position = new Cartographic();

        camera.position = Cartesian3.fromDegrees(10.0, 45.0, 1000.0);

        var endPosition = Cartesian3.fromDegrees(20.0, 45.0, 1000.0);

        var overLonFlight = CameraFlightPath.createTween(scene, {
            destination : endPosition,
            duration : 1.0,
            flyOverLongitude: CesiumMath.toRadians(0.0)
        });

        var directFlight = CameraFlightPath.createTween(scene, {
            destination : endPosition,
            duration : 1.0
        });

        expect(typeof overLonFlight.update).toEqual('function');
        expect(typeof directFlight.update).toEqual('function');

        overLonFlight.update({ time : 0.3 });
        projection.ellipsoid.cartesianToCartographic(camera.position, position);
        var lon = CesiumMath.toDegrees(position.longitude);

        expect(lon).toBeLessThan(10.0);

        directFlight.update({ time : 0.3 });
        projection.ellipsoid.cartesianToCartographic(camera.position, position);
        lon = CesiumMath.toDegrees(position.longitude);

        expect(lon).toBeGreaterThan(10.0);
        expect(lon).toBeLessThan(20.0);

    });

    it('uses flyOverLongitudeWeight', function() {
        var camera = scene.camera;
        var projection = scene.mapProjection;
        var position = new Cartographic();

        camera.position = Cartesian3.fromDegrees(10.0, 45.0, 1000.0);

        var endPosition = Cartesian3.fromDegrees(50.0, 45.0, 1000.0);

        var overLonFlightSmallWeight = CameraFlightPath.createTween(scene, {
            destination : endPosition,
            duration : 1.0,
            flyOverLongitude: CesiumMath.toRadians(0.0),
            flyOverLongitudeWeight: 2
        });

        var overLonFlightBigWeight = CameraFlightPath.createTween(scene, {
            destination : endPosition,
            duration : 1.0,
            flyOverLongitude: CesiumMath.toRadians(0.0),
            flyOverLongitudeWeight: 20
        });

        overLonFlightBigWeight.update({ time : 0.3 });
        projection.ellipsoid.cartesianToCartographic(camera.position, position);
        var lon = CesiumMath.toDegrees(position.longitude);

        expect(lon).toBeLessThan(10.0);

        overLonFlightSmallWeight.update({ time : 0.3 });
        projection.ellipsoid.cartesianToCartographic(camera.position, position);
        lon = CesiumMath.toDegrees(position.longitude);

        expect(lon).toBeGreaterThan(10.0);
        expect(lon).toBeLessThan(50.0);

    });

    it('adjust pitch if camera flyes higher than pitchAdjustHeight', function(){
        var camera = scene.camera;
        var duration = 5.0;

        camera.setView({
            destination : Cartesian3.fromDegrees(-20.0, 0.0, 1000.0),
            orientation: {
                heading : CesiumMath.toRadians(0.0),
                pitch : CesiumMath.toRadians(-15.0),
                roll : 0.0
            }
        });

        var startPitch = camera.pitch;
        var endPitch = CesiumMath.toRadians(-45.0);

        var flight = CameraFlightPath.createTween(scene, {
            destination : Cartesian3.fromDegrees(60.0, 0.0, 2000.0),
            pitch : endPitch,
            duration : duration,
            pitchAdjustHeight: 2000
        });

        flight.update({ time: 0.0 });
        expect(camera.pitch).toEqualEpsilon(startPitch, CesiumMath.EPSILON6);

        flight.update({ time : duration });
        expect(camera.pitch).toEqualEpsilon(endPitch, CesiumMath.EPSILON6);

        flight.update({ time : duration / 2.0 });
        expect(camera.pitch).toEqualEpsilon(-CesiumMath.PI_OVER_TWO, CesiumMath.EPSILON4);

    });

    it('animation with flyOverLongitude is smooth over two pi', function() {
        var camera = scene.camera;
        var duration = 100.0;
        var projection = scene.mapProjection;
        var position = new Cartographic();

        var startLonDegrees = 10.0;
        var endLonDegrees = 20.0;

        camera.position = Cartesian3.fromDegrees(startLonDegrees, 45.0, 1000.0);
        var endPosition = Cartesian3.fromDegrees(endLonDegrees, 45.0, 1000.0);

        var outsideTwoPiFlight = CameraFlightPath.createTween(scene, {
            destination : endPosition,
            duration : duration,
            flyOverLongitude: CesiumMath.toRadians(0.0)
        });

        var prevLon = startLonDegrees;
        var crossedDateChangesLine = 0;
        for(var t = 1; t < duration; t++) {
            outsideTwoPiFlight.update({ time: t });
            projection.ellipsoid.cartesianToCartographic(camera.position, position);
            var lon = CesiumMath.toDegrees(position.longitude);
            var d = lon - prevLon;
            if (d > 0) {
                expect(prevLon).toBeLessThan(-90);
                crossedDateChangesLine ++;
                d -= 360;
            }
            prevLon = lon;
            expect(d).toBeLessThan(0);
        }

        expect(crossedDateChangesLine).toEqual(1);
    });

    it('animation with flyOverLongitude is smooth', function() {
        var camera = scene.camera;
        var duration = 100.0;
        var projection = scene.mapProjection;
        var position = new Cartographic();

        var startLonDegrees = -100.0;
        var endLonDegrees = 100.0;

        camera.position = Cartesian3.fromDegrees(startLonDegrees, 45.0, 1000.0);
        var endPosition = Cartesian3.fromDegrees(endLonDegrees, 45.0, 1000.0);

        var flight = CameraFlightPath.createTween(scene, {
            destination : endPosition,
            duration : duration,
            flyOverLongitude: CesiumMath.toRadians(0.0)
        });

        var prevLon = startLonDegrees;
        for(var t = 1; t < duration; t++) {
            flight.update({ time: t });
            projection.ellipsoid.cartesianToCartographic(camera.position, position);
            var lon = CesiumMath.toDegrees(position.longitude);
            var d = lon - prevLon;
            prevLon = lon;
            expect(d).toBeGreaterThan(0);
        }
    });

    it('does not go above the maximum height', function() {
        var camera = scene.camera;

        var startPosition = Cartesian3.fromDegrees(0.0, 0.0, 1000.0);
        var endPosition = Cartesian3.fromDegrees(10.0, 0.0, 1000.0);
        var duration = 5.0;

        camera.setView({
            destination : startPosition
        });

        var flight = CameraFlightPath.createTween(scene, {
            destination : endPosition,
            duration : duration
        });

        var maximumHeight = Number.NEGATIVE_INFINITY;
        var i;
        for (i = 0; i <= duration; ++i) {
            flight.update({ time : i });
            maximumHeight = Math.max(maximumHeight, camera.positionCartographic.height);
        }

        maximumHeight *= 0.5;

        camera.setView({
            destination : startPosition
        });

        flight = CameraFlightPath.createTween(scene, {
            destination : endPosition,
            duration : duration,
            maximumHeight : maximumHeight
        });

        for (i = 0; i <= duration; ++i) {
            flight.update({ time : i });
            expect(camera.positionCartographic.height).toBeLessThan(maximumHeight);
        }
    });
}, 'WebGL');