package
{

    import flash.display.Graphics;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.TimerEvent;
    import flash.utils.Timer;

    import nape.geom.Vec2;
    import nape.phys.Body;
    import nape.phys.BodyType;
    import nape.phys.Material;
    import nape.shape.Circle;
    import nape.shape.Polygon;
    import nape.space.Broadphase;
    import nape.space.Space;
    import nape.util.ShapeDebug;

    [SWF(width=800, height=600, backgroundColor=0xdddddd, frameRate=30)]
    /**
     *
     */
    public class Nape2KinematicBody extends Sprite
    {
        //
        static public const APP_WIDTH:int = 800;
        static public const APP_HEIGHT:int = 600;

        //
        private var _space:Space;
        private var _timeStep:Number = 1/30.0;
        private var _velocityIterations:int = 10;
        private var _positionIterations:int = 10;

        private var _debug:ShapeDebug;

        private var _trampoline:Body;
        private var _conveyorBelt:Body;
        private var _elevator:Body;

        private var _elevatorVelocityUp:Vec2 = new Vec2(0, -100);
        private var _elevatorVelocityDown:Vec2 = new Vec2(0, 200);
        private var _elevatorSurfaceVelocity:Vec2 = new Vec2(-200, 0);
        private var _trampolineSurfaceVelocity:Vec2 = new Vec2(-300, 350);
        private var _conveyorBeltVelocity:Vec2 = new Vec2(150, 0);

        private var _timer:Timer = new Timer(1000, 0);
        private var _holdOn:Boolean = false;

        public function Nape2KinematicBody()
        {
            if (stage) init();
            else addEventListener(Event.ADDED_TO_STAGE, init);
        }

        /**
         */
        private function init(event:Event = null):void
        {
            removeEventListener(Event.ADDED_TO_STAGE, init);

            _space = new Space(new Vec2(0, 400), Broadphase.SWEEP_AND_PRUNE);
            createBodies();
            initDebugDraw();

            addEventListener(Event.ENTER_FRAME, enterFrameHandler);
        }

        /**
         */
        private function createBodies():void
        {
            // Динамические тела
            var cube:Body = new Body(BodyType.DYNAMIC);
            cube.shapes.add(new Polygon(Polygon.box(100, 50)));

            var ball:Body = new Body(BodyType.DYNAMIC);
            ball.shapes.add(new Circle(10));

            // Кинемат. тело - трамплин
            _trampoline = new Body(BodyType.KINEMATIC);
            _trampoline.shapes.add(new Polygon(Polygon.box(300, 50)));

            // Кинемат. тело - конвейер
            _conveyorBelt = new Body(BodyType.KINEMATIC);
            _conveyorBelt.shapes.add(new Polygon(Polygon.box(600, 50)));

            // Кинемат. тело - лифт
            _elevator = new Body(BodyType.KINEMATIC);
            _elevator.shapes.add(new Polygon(Polygon.box(300, 50)));

            // Статические тела - стены
            var wallLeft:Body = new Body(BodyType.STATIC);
            wallLeft.shapes.add(new Polygon(Polygon.box(50, 400)));

            var wallRight:Body = new Body(BodyType.STATIC);
            wallRight.shapes.add(new Polygon(Polygon.box(50, 600)));

            // Устанавливаем позицию телам
            _elevator.position.setxy(650, 500);
            _trampoline.position.setxy(350, 250);
            _conveyorBelt.position.setxy(200, 450);
            cube.position.setxy(600, 450);
            ball.position.setxy(550, 450);
            wallLeft.position.setxy(0, 200);
            wallLeft.rotation = -0.45;
            wallRight.position.setxy(800, 300);

            // Добавляем тела в мир
            _elevator.space = _space;
            _trampoline.space = _space;
            _conveyorBelt.space = _space;
            cube.space = _space;
            ball.space = _space;
            wallLeft.space = _space;
            wallRight.space = _space;

            // Устанавливаем нужные скорости
            _elevator.velocity.set(_elevatorVelocityUp);
            _trampoline.surfaceVel.set(_trampolineSurfaceVelocity);
            _conveyorBelt.kinematicVel.set(_conveyorBeltVelocity);
        }

        /**
         */
        private function initDebugDraw():void
        {
            _debug = new ShapeDebug(APP_WIDTH, APP_HEIGHT, 0x000000);
            addChild(_debug.display);
        }

        /**
         */
        private function enterFrameHandler(event:Event):void
        {
            _space.step(_timeStep, _velocityIterations, _positionIterations);

            _debug.clear();
            _debug.draw(_space);
            _debug.flush();

            updateKinematicPosition();
        }

        /**
         */
        private function updateKinematicPosition():void
        {
             // Если лифт в ожидании то ничего не проверяем
            if (_holdOn) return;

            // если лифт достиг верхней границы то останавливаем его и скидываем с него груз
            if (_elevator.position.y <= 150)
            {
                _elevator.velocity.setxy(0, 0);

                _elevator.surfaceVel.set(_elevatorSurfaceVelocity);

                _holdOn = true;
                _timer.addEventListener(TimerEvent.TIMER, throwGoodsComplete);
                _timer.delay = 3000;
                _timer.start();
            }
            // если лифт достиг нижней границы то останавливаем его и ждем погрузки
            else if (_elevator.position.y >= 500)
            {
                _elevator.velocity.setxy(0, 0);

                _holdOn = true;
                _timer.addEventListener(TimerEvent.TIMER, waitForGoods);
                _timer.delay = 5000;
                _timer.start();
            }
        }

        /**
         */
        private function throwGoodsComplete(event:TimerEvent):void
        {
            _elevator.velocity.set(_elevatorVelocityDown);
            _elevator.surfaceVel.setxy(0, 0);

            _holdOn = false;
            _timer.removeEventListener(TimerEvent.TIMER, throwGoodsComplete);
            _timer.stop();
        }

        /**
         */
        private function waitForGoods(event:TimerEvent):void
        {
            _elevator.velocity.set(_elevatorVelocityUp);

            _holdOn = false;
            _timer.removeEventListener(TimerEvent.TIMER, waitForGoods);
            _timer.stop();
        }
    }
}