package de.fau.cs.mad.fly.game;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.PerspectiveCamera;

import de.fau.cs.mad.fly.Loader;
import de.fau.cs.mad.fly.player.Player;
import de.fau.cs.mad.fly.profile.PlayerProfile;

/**
 * Controls the camera following the player
 * 
 * @author Sebastian
 * 
 */
public class CameraController {
    
    private PerspectiveCamera camera;
    private final float cameraOffset;
    private final float cameraDistance;
    private Player player;
    private PlayerProfile playerProfile;
    
    private float screenHeight = Gdx.graphics.getHeight();
    private float screenWidth = Gdx.graphics.getWidth();
    private float[] values;
    
    public CameraController(Player player, PlayerProfile playerProfile) {
        this.player = player;
        this.playerProfile = playerProfile;
        
        this.cameraOffset = 0.5f;
        this.cameraDistance = 2.0f;
        
        setUpCamera();
    }
    
    /**
     * Getter for the camera
     * 
     * @return the camera following the player
     */
    public PerspectiveCamera getCamera() {
        return camera;
    }
    
    /**
     * Computes new Position for the camera in 3rd person view
     * 
     * @return The PersectiveCamera on the new position
     */
    public PerspectiveCamera updateCamera() {
        
        values = player.getPlane().getTransform().getValues();
        camera.direction.set(values[8], values[9], values[10]).nor();
        camera.up.set(values[4], values[5], values[6]).nor();
        
        camera.position.set(player.getPlane().getPosition().cpy().sub(camera.direction.cpy().scl(cameraDistance)));
        camera.position.add(camera.up.x * cameraOffset, camera.up.y * cameraOffset, camera.up.z * cameraOffset);
        
        camera.update();
        
        return camera;
    }
    
    /**
     * Sets up the camera for the initial view.
     */
    private final void setUpCamera() {
        camera = new PerspectiveCamera(67, screenWidth, screenHeight);
        
        camera.position.set(Loader.getInstance().getCurrentLevel().start.position);
        camera.lookAt(Loader.getInstance().getCurrentLevel().start.viewDirection);
        camera.near = 0.1f;
        camera.far = Loader.getInstance().getCurrentLevel().radius * 2;
        camera.update();
    }
}