drv.Reset();

drv.SetBackColor([98, 227, 255]);	// Sky Blue

var lgtAmb = new Light(0);
lgtAmb.SetColor([200,200,200]);
var lgtDir = new Light(3);
lgtDir.Turn(-45);

field = new Plane(5000, 5000, "grass.wjp", null, 50, 50);
field.SetOrientation(0,1,0, 0,0,1);

var dir;
for (dir = 0; dir <= 360; dir += 90)
	new Wall(dir);

function Wall(dir)
{
	SetCollisionCallback(this);
	this.plane = new Plane(5000, 700, "mountains.wpg", [255,0,0]);
	this.plane.SetDir(dir+180);
	this.plane.MoveTo(Math.sin(Math.Rad(dir)) * 2500, 345, Math.cos(Math.Rad(dir)) * 2500);
	SetCollisionCallback();
}

sndMusic = new Sound("music", true);
sndMusic.Volume(32);
sndBoom = new Sound("boom");
sndShot = new Sound("shot");
sndMusic.Play();

tankLeft = new Tank(-1250, 0, 90, "WASZ-RDF");	// FLRB-SLR

tankRight = new Tank(1250, 0, 270, "YGHB-IJK");

Tank.idNext = 1;

function Tank(x, z, dir, stKeys)
{
	var i;

	// Work around JScript prob where Tank.idNext initializer lost on function def!
	if (Tank.idNext == undefined)
		Tank.idNext = 1;

	this.id = Tank.idNext++;

	SetCollisionCallback(this);

	this.modBody = new Model("body");
	this.modTur = new Model("turret");

	// Adjust tank to be forward in Z direction, and wheels on the surface
	grpAdjust = new Group(this.modBody, this.modTur);
	grpAdjust.Turn(90);
	grpAdjust.Move(0,-20,0);

	this.cam = new Camera;
	this.grpTur = new Group(this.modTur, this.cam);
	this.cam.Move(0, 150, -500);
	this.cam.LookAt(this.grpTur);
	this.grpTank = new Group(grpAdjust, this.grpTur);
	this.grpTank.Move(0,50,0);

	SetCollisionCallback();

	this.snd = new Sound("5sengine", true);

	this.shells = new Array;
	for (i = 0; i < 6; i++)
		this.shells[i]= new Shell();
	this.ishellNext = 0;
	
	this.ctr = new CBController(this, "Tank #" + this.id, stKeys, "FLRB-Slr");

	this.speed = 0;
	this.ddirTank = 0;
	this.ddirTur = 0;
	this.hits = 0;

	this.grpTank.Move(x, 0, z);
	this.grpTank.SetDir(dir);
}

function Tank.prototype.DoKey(ch, fDown)
{
	switch (ch)
		{
	case "F":
		if (fDown)
			{
			this.snd.Play();
			this.speed = 100;
			}
		else
			{
			this.snd.Stop();
			this.speed = 0;
			}
		break;
	case "B":
		if (fDown)
			{
			this.snd.Play();
			this.speed = -100;
			}
		else
			{
			this.snd.Stop();
			this.speed = 0;
			}
		break;
	case "L":
		if (fDown)
			this.ddirTank = -30;
		else
			this.ddirTank = 0;
		break;
	case "R":
		if (fDown)
			this.ddirTank = 30;
		else
			this.ddirTank = 0;
		break;
	case "S": // Shoot
		if (fDown)
			{
			var shell = this.shells[this.ishellNext];
			shell.Fire(this.grpTank.GetPos(true), this.grpTur.GetDir(true));
			this.ishellNext = (this.ishellNext + 1) % this.shells.length;
			}
		break;
	case "l":	// Turret Left
		if (fDown)
			this.ddirTur = -60;
		else
			this.ddirTur = 0;
		break;
	case "r": // Turret Right
		if (fDown)
			this.ddirTur = 60;
		else
			this.ddirTur = 0;
		break;
		}
}

function Tank.prototype.DoRender(msInterval, msTime)
{
	this.grpTur.Turn(msInterval * this.ddirTur / 1000);
	this.grpTank.Turn(msInterval * this.ddirTank / 1000);

	if (this.speed == 0)
		return;
	
	var dist = msInterval * this.speed / 1000;

	var ci = this.grpTank.TestCollision(dist);
	if (ci == null)
		this.grpTank.Forward(dist);
}

function Tank.prototype.Hit()
{
	new Explosion(this.grpTank.GetPos(true));
	this.hits++;
//	this.ctr.Status("Hits: " + this.hits);
}

Shell.prototype.speed = 2000;

function Shell()
{
	this.mod = new Sphere(25);
	this.mod.SetColor([180, 120, 120]);
	this.ctr = new CBController(this);

	// Take off stage until needed
	this.mod.Remove();
	this.ctr.Suspend(true);
}

function Shell.prototype.Fire(pos, dir)
{
	sndShot.Play();

	this.mod.Add();
	this.mod.MoveTo(pos.x, pos.y, pos.z);
	this.mod.SetDir(dir);
	this.ctr.Suspend(false);
}

function Shell.prototype.DoRender(msDelay, msTime)
{
	var dist;
	var obj;

	dist = msDelay * this.speed / 1000;

	var ci = this.mod.TestCollision(dist);
	if (ci == null)
		{
		this.mod.Forward(dist);
		return;
		}

	this.mod.Remove();
	this.ctr.Suspend(true);

	if (ci.objCallback && ci.objCallback.Hit != undefined)
		ci.objCallback.Hit(this);

	this.mod.Remove();
	this.ctr.Suspend(true);
}

function Explosion(pos)
{
	sndBoom.Play();

	this.mod = new Sphere(4);
	this.mod.SetTexture("fireball.wjp");
	this.mod.MoveTo(pos.x, pos.y, pos.z);
	this.mod.Spin();
	this.ctr = new CBController(this);
	this.ctr.SetLifetime(5000);
}

function Explosion.prototype.DoRender(msInterval, msTime)
{
	this.mod.AbsoluteScale(this.ctr.Proportion(1, 100));
	this.mod.SetOpacity(this.ctr.Proportion(255, 20));
	if (this.ctr.fFinal)
		{
		this.ctr.Remove();
		this.mod.Remove();
		}
}