import java.awt.Color;
import java.util.List;
import java.util.ArrayList;

class GameScreen implements LinearColorAnimator.AnimationListener
{
    private final static int LEVEL_TIME = 10;

    private final List<Drawable> _drawables;
    private final Bird _bird;
    private final World _world;
    private final LinearColorAnimator _backgroundAnimator;
    private double _totalTime;
    private int _try;
    private int _level;

    public GameScreen()
    {
        _drawables = new ArrayList<Drawable>();
        _backgroundAnimator = new LinearColorAnimator(Color.BLACK, Color.WHITE, 1, this);
        _backgroundAnimator.start();
        _bird = new Bird(this);
        _world = new World(this);
        _totalTime = 0;
        _try = 1;
    }

    /*
     * Elapsed time is expected to be in ms
     */
    public void update(double elapsed)
    {
        _bird.update(elapsed);
        _world.update(elapsed);
        _backgroundAnimator.update(elapsed);
        _totalTime += elapsed;
        System.out.print("\r" + _try + " - Time survived: " + (int)(_totalTime * 1e-3) + "s, " +
                "speed: " + (int)_world.getSpeed() + "px/s");

        if (_totalTime / (LEVEL_TIME * 1e3) > _level + 1)
        {
            ++_level;
            // Would be nice to add some more levels with different colors
            if (_level == 1)
            {
                _world.setObstacleColor("grau");
                _backgroundAnimator.setStart(Color.WHITE);
                _backgroundAnimator.setEnd(Color.BLACK);
                _backgroundAnimator.start();
            }
        }

        Rectangle birdRect = _bird.getRect();
        if (_world.checkCollision(_bird.getRect())
                || birdRect.getY() + birdRect.getHeight() > TurtleWelt.HEIGHT
                || birdRect.getY() + birdRect.getHeight() < 0)
        {
            System.out.print("\n");
            ++_try;
            _totalTime = _level = 0;
            _bird.reset();
            _world.reset();

            // If the background is currently not white, smoothly animate it back
            if (_backgroundAnimator.getCurrentColor().getRGB() != Color.WHITE.getRGB())
            {
                _backgroundAnimator.setStart(_backgroundAnimator.getCurrentColor());
                _backgroundAnimator.setEnd(Color.WHITE);
                _backgroundAnimator.start();
            }
        }
    }

    public void onAnimationFinished()
    {
        if (_backgroundAnimator.getEnd().getRGB() == Color.BLACK.getRGB())
        {
            _world.setObstacleColor("weiss");
        }
    }

    public void draw(Turtle turtle, double elapsed)
    {
        Color bg = _backgroundAnimator.getCurrentColor();
        TurtleWelt.globaleWelt.bildschirmEinfaerben(bg.getRed(), bg.getGreen(), bg.getBlue());
        for (Drawable d : _drawables)
        {
            d.draw(turtle, elapsed);
        }
    }

    public void addDrawable(Drawable d)
    {
        _drawables.add(d);
    }

    public void jump()
    {
        _bird.jump();
    }
}