import java.awt.*;
import java.awt.geom.*;

public class Shooter
{
    private double x;
    private double y;
    private double turretAngle;
    private double direction;
    private boolean isPlayerShip = false;
    private int health = DEFAULT_HEALTH;
    
    private final static double TURRET_LENGTH = 30.0;
    private final static double MOVE_DISTANCE = 1.0;
    private final static int DEFAULT_HEALTH = 1;
    private final static int TURRET_THICKNESS = 3;
    private final static Color PLAYER_COLOR = Color.green;
    private final static Color ENEMY_COLOR = Color.red;
    private final static Color TURRET_COLOR = Color.black;
    
    public Shooter(double x_, double y_)
    {
        x = x_;
        y = y_;
    }
    
    public void setPosition(double x_, double y_)
    {
        x = x_;
        y = y_;
    }
    
    public void draw(Graphics2D g2)
    {   
        if(isPlayerShip)
        {
            g2.setColor(PLAYER_COLOR);
        }
        else
        {
            g2.setColor(ENEMY_COLOR);
        }
        
        g2.fill(new Ellipse2D.Double(x - TURRET_LENGTH / 4, y - TURRET_LENGTH / 4, TURRET_LENGTH / 2, TURRET_LENGTH / 2));
        g2.setColor(TURRET_COLOR);
        g2.setStroke(new BasicStroke(TURRET_THICKNESS));
        g2.draw(new Line2D.Double(x, y, x + TURRET_LENGTH * Math.cos(turretAngle), y + TURRET_LENGTH * Math.sin(turretAngle)));
    }
    
    public Laser fire()
    {
        return new Laser(x + TURRET_LENGTH * Math.cos(turretAngle), y + TURRET_LENGTH * Math.sin(turretAngle), turretAngle);
    }
    
    public void setTurretAngle(double angleX, double angleY)
    {
        double width = angleX - x;
        double height = angleY - y;
        
        turretAngle = Math.atan(height / width) + Math.PI;
        
        if(angleX > x)
         turretAngle -= Math.PI;
    }
    
    public void setTurretAngle(double turretAngle_)
    {
        turretAngle = turretAngle_;
    }
    
    public void setShipDirection(double direction_)
    {
        direction = direction_;
    }
    
    public void move()
    {
        x += MOVE_DISTANCE * Math.cos(direction);
        y += MOVE_DISTANCE * Math.sin(direction);
    }
    
    public double getX()
    {
        return x;
    }
    
    public double getY()
    {
        return y;
    }
    
    public boolean isHitting(double hitX1, double hitY1, double hitX2, double hitY2)
    {
        Ellipse2D.Double shipBody = new Ellipse2D.Double(x - TURRET_LENGTH / 4, y - TURRET_LENGTH / 4, TURRET_LENGTH / 2, TURRET_LENGTH / 2);
        return shipBody.contains(hitX1, hitY1) || shipBody.contains(hitX2, hitY2);
    }
    
    public void takeHit()
    {
        health--;
    }
    
    public boolean isDead()
    {
        return health == 0;
    }
    
    public void setPlayerShip()
    {
        isPlayerShip = true;
    }
    
    public boolean isPlayerShip()
    {
        return isPlayerShip;
    }
    
    public double getTurretAngle()
    {
        return turretAngle;
    }
    
    public static double findAngle(double angleX, double angleY, double refX, double refY)
    { 
        double width = angleX - refX;
        double height = angleY - refY;
        
        double ret = Math.atan(height / width) + Math.PI;
        
        if(angleX > refX)
         ret -= Math.PI;
         
        return ret;
    }
}