package ei.game.scene.units;


import java.util.LinkedList;

import ei.engine.math.Vector2f;
import ei.engine.math.Vector2i;
import ei.engine.math.Vector3f;
import ei.engine.scene.Node;
import ei.game.algo.AStar;
import ei.game.algo.AStarNode;
import ei.game.gamestate.InGameState;
import ei.game.scene.GameEntity;
import ei.game.scene.Map;
import ei.game.scene.weapons.Weapon;

/**
 * The Unit class, handles the units in the game.
 * @author Jesper Lundin
 * @author Ziver koc
 *
 */
public abstract class Unit extends GameEntity{
	// The texture
	private Node unitNode;
	// The wepon of the unit
	private Weapon weapon;
	// Som temp pos for moving the unit
	private Vector2i oldPos;
	private Vector2f moveTo;
	private LinkedList<AStarNode> path;

	/**
	 * Creates a empty unit
	 * 
	 * @param l The max life of the unit
	 */
	public Unit(int l, Vector2i pos) {
		super(l);
		unitNode = new Node("unit");
		unitNode.setLocation(Map.getPixelByPos(pos.getX(), pos.getY()));
		setPos(pos.getX(), pos.getY());
	}
	
	public void setSelected(boolean b) {
		super.setSelected(b);
		if(b) {
			unitNode.add(getSelection());
		}
		else{
			unitNode.remove(getSelection());
		}
	}
	
	/**
	 * Returns the sprite for the unit
	 * 
	 * @return The sprite for the unit
	 */
	public Node getNode(){
		return unitNode;
	}
	/**
	 * Changes the pos of the unit in the map
	 * 
	 * @param x The x pos to move to
	 * @param y The y pos to move to
	 */
	public void setPos(int x, int y) {
		if(oldPos!=null) {
			InGameState.getMap().removePos(oldPos.getX(), oldPos.getY());
		}
		oldPos = new Vector2i(x, y);
		InGameState.getMap().setPos(this, x, y);		
	}
	
	/**
	 * Moving a unit to the given pos
	 * 
	 * @param x The x pos to move to
	 * @param y The y pos to move to
	 */
	public void move(int x, int y) {
		path = (LinkedList<AStarNode>) new AStar().startSearch(oldPos,new Vector2i(x,y));

		if(path != null && !path.isEmpty()){	
			AStarNode temp = path.poll();
			moveTo = Map.getPixelByPos(temp.getX(), temp.getY());
			setPos(temp.getX(), temp.getY());
		}
	}
	
	/**
	 * Updating the unit
	 */
	public void update() {
		if(moveTo != null) {
			Vector2i moveVect = Map.getPosByPixel(moveTo.getX(), moveTo.getY());
			Vector2i  currentVect = Map.getPosByPixel(unitNode.getLocation().getX(), unitNode.getLocation().getY());
			Vector3f lastRotation = new Vector3f(0, 0, 0);
			
			//The rotation animation is done here.
			if(moveVect.getX() < currentVect.getX()) {
				unitNode.get("Tank").setRotation(new Vector3f(0, 0, 90));
				}
			
			if(moveVect.getX() > currentVect.getX()){
				unitNode.get("Tank").setRotation(new Vector3f(0, 0, -90));
				}
		
			if(moveVect.getY() < currentVect.getY()){
				unitNode.get("Tank").setRotation(new Vector3f(0, 0, 180));
				}

			if(moveVect.getY() > currentVect.getY())  {
				unitNode.get("Tank").setRotation(new Vector3f(0, 0, 0));
				}
			//System.out.println(unitNode.get("Tank").getRotation());
			
			
			//The moving is done here.
			if(moveTo.getX() > unitNode.getLocation().getX()) {
				unitNode.getLocation().add(1.5f, 0f, 0f);
			}
			if(moveTo.getX() < unitNode.getLocation().getX()) {
				unitNode.getLocation().add(-1.5f, 0f, 0f);
			}
			if(moveTo.getY() > unitNode.getLocation().getY()) {
				unitNode.getLocation().add(0f, 1.5f, 0f);
			}
			if(moveTo.getY() < unitNode.getLocation().getY()) {
				unitNode.getLocation().add(0f, -1.5f, 0f);
			}
			
			if(Math.abs(moveTo.getX() - unitNode.getLocation().getX()) < 2
					&& Math.abs(moveTo.getY() - unitNode.getLocation().getY())< 2 ){
				if(path != null && !path.isEmpty()){
					AStarNode temp = path.poll();
					if(InGameState.getMap().isPosEmpty(temp.getX(), temp.getY())){
						moveTo = Map.getPixelByPos(temp.getX(), temp.getY());
						setPos(temp.getX(), temp.getY());
					}
					else if(!path.isEmpty()){
						move(path.getLast().getX(),	path.getLast().getY());
					}
				}
				else{
					moveTo = null;
				}
			}
		}
	}
}