/*******************************************************************************
 * Copyright (c) 2001, 2008 Mathew A. Nelson and Robocode contributors
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://robocode.sourceforge.net/license/cpl-v10.html
 *
 * Contributors:
 *     Mathew A. Nelson
 *     - Initial implementation
 *     Flemming N. Larsen
 *     - Maintainance
 *******************************************************************************/
package sample;


import robocode.Robot;
import robocode.ScannedRobotEvent;
import robocode.WinEvent;

import java.awt.*;


/**
 * TrackFire - a sample robot by Mathew Nelson, and maintained by Flemming N. Larsen
 * <p/>
 * Sits still.  Tracks and fires at the nearest robot it sees
 */
public class TrackFire extends Robot {

	/**
	 * TrackFire's run method
	 */
	public void run() {
		// Set colors
		setBodyColor(Color.pink);
		setGunColor(Color.pink);
		setRadarColor(Color.pink);
		setScanColor(Color.pink);
		setBulletColor(Color.pink);

		// Loop forever
		while (true) {
			turnGunRight(10); // Scans automatically
		}
	}

	/**
	 * onScannedRobot:  We have a target.  Go get it.
	 */
	public void onScannedRobot(ScannedRobotEvent e) {
		// Calculate exact location of the robot
		double absoluteBearing = getHeading() + e.getBearing();
		double bearingFromGun = normalRelativeAngle(absoluteBearing - getGunHeading());

		// If it's close enough, fire!
		if (Math.abs(bearingFromGun) <= 3) {
			turnGunRight(bearingFromGun);
			// We check gun heat here, because calling fire()
			// uses a turn, which could cause us to lose track
			// of the other robot.
			if (getGunHeat() == 0) {
				fire(Math.min(3 - Math.abs(bearingFromGun), getEnergy() - .1));
			}
		} // otherwise just set the gun to turn.
		// Note:  This will have no effect until we call scan()
		else {
			turnGunRight(bearingFromGun);
		}
		// Generates another scan event if we see a robot.
		// We only need to call this if the gun (and therefore radar)
		// are not turning.  Otherwise, scan is called automatically.
		if (bearingFromGun == 0) {
			scan();
		}
	}

	public void onWin(WinEvent e) {
		// Victory dance
		turnRight(36000);
	}

	// Helper function
	public double normalRelativeAngle(double angle) {
		if (angle > -180 && angle <= 180) {
			return angle;
		}
		double fixedAngle = angle;

		while (fixedAngle <= -180) {
			fixedAngle += 360;
		}
		while (fixedAngle > 180) {
			fixedAngle -= 360;
		}
		return fixedAngle;
	}
}				
