/*
FixedTank.java
	(C) Copyright 2000 by Scott Sherman.  All rights reserved.
Scott Sherman 11-01...

	a simple tank which doesn't change direction or speed,
		it simply fires at the closest tank
*/

import java.util.Enumeration;
import com.loki3.cyber.pawn.*;
import com.loki3.util.Angle;

public class FixedTank
	implements GameListener, ScannerListener
{
	// GameListener
	public boolean use(Pawn pawn)
	{
		mPawn = pawn;
		// find out about scanners
		for (Enumeration e=pawn.getScanners(); e!=null && e.hasMoreElements();)
		{
			Object scanner = e.nextElement();
			if (scanner instanceof ScannerRadar)
				((ScannerRadar)scanner).addScannerListener(this);
			else if (scanner instanceof ScannerPerfect)
				mScannerPerfect = (ScannerPerfect)scanner;
		}
		// find out about weapons
		for (Enumeration e=pawn.getWeapons(); e!=null && e.hasMoreElements();)
		{
			Object weapon = e.nextElement();
			if (weapon instanceof WeaponTurret)
				mWeaponTurret = (WeaponTurret)weapon;
			else if (weapon instanceof WeaponMineLayer)
				mWeaponMineLayer = (WeaponMineLayer)weapon;
		}
		// remember our primary identity
		mName = pawn.getIdentity().getFirstName();
		return true;
	}
	public void gameStarted()
	{
	}

	public void gameTick(double tick)
	{
		if (mScannerPerfect != null)
		{
			mScannerPerfect.scan();
			// find closest pawn that doesn't have our identity
			ScannedUnit closest = mScannerPerfect.getPawns().getClosest(mName, false);
			if ( (closest != null) && closest.getIsAlive() )
  				unitScanned(closest.getDistance(), closest.getAngle());
		}
	}

	public void gameEnded()	{ mPawn = null; }

	// ScannerListener if we have a radar scanner,
	// also called explictly for a ScannerPerfect
	public void unitScanned(double distance, double angle)
	{
		// rotate turret in direction of scanned object
		double turretdelta = Angle.normalize(angle - mWeaponTurret.getCurrentAngle());
		mWeaponTurret.turnLeft(turretdelta);
		// if we're almost aiming at pawn, fire
		if ( (turretdelta < Angle.degreesToRadians(10)) || (turretdelta > Angle.degreesToRadians(350)) )
			if ( (mWeaponTurret != null) && mWeaponTurret.canFire() )
				mWeaponTurret.fire();

		// if a tank is behind us, drop a mine
		if ( (angle > Angle.degreesToRadians(170)) || (angle < Angle.degreesToRadians(-170)) )
			if ( (mWeaponMineLayer != null) && mWeaponMineLayer.canFire() )
				mWeaponMineLayer.fire();
	}

	private Pawn mPawn = null;
	private ScannerPerfect mScannerPerfect = null;
	private WeaponTurret mWeaponTurret = null;
	private WeaponMineLayer mWeaponMineLayer = null;
	private String mName = null;  // our primary identity
}