var wheelFL : Transform;
var wheelFR : Transform;
var wheelML : Transform;
var wheelMR : Transform;
var wheelBL : Transform;
var wheelBR : Transform;

//automatic transmission shift points
var shiftDownRPM = 2500;
var shiftUpRPM = 5500;

//gear ratios
var gearRatios = [-2.66, 2.66, 1.78, 1.30, 1.00];
var finalDriveRatio = 3.4;



var frontWheelSteering = false;
var middleWheelSteering = false;
var rearWheelSteering = false;

var frontWheelDrive = false;
var middleWheelDrive = false;
var rearWheelDrive = false;

var minSteeringAngle = 0.00;
var maxSteeringAngle = 0.00;
var highSpeed = 0.00;

var motorMass = 1.00;
var motorDrag = 0.00;
var maxAcceleration = 0.00;
var maxMotorSpeed = 0.00;
var minTorque = 0.00;
var maxTorque = 0.00;

var centerOfMass : Vector3;
rigidbody.centerOfMass = centerOfMass;


private var queryUserInput = true;
private var engineRPM : float;
private var onGround = false;
private var wheelRPM : float;
private var gear = 1;


private var scriptWheelFL : Wheel;
private var scriptWheelFR : Wheel;
private var scriptWheelML : Wheel;
private var scriptWheelMR : Wheel;
private var scriptWheelBL : Wheel;
private var scriptWheelBR : Wheel;
scriptWheelFL = wheelFL.GetComponent(Wheel);
scriptWheelFR = wheelFR.GetComponent(Wheel);
scriptWheelML = wheelML.GetComponent(Wheel);
scriptWheelMR = wheelMR.GetComponent(Wheel);
scriptWheelBL = wheelBL.GetComponent(Wheel);
scriptWheelBR = wheelBR.GetComponent(Wheel);
scriptWheelFL.car = this;
scriptWheelFR.car = this;
scriptWheelML.car = this;
scriptWheelMR.car = this;
scriptWheelBL.car = this;
scriptWheelBR.car = this;

var steeringInput = 0.00;
var motorInput = 0.00;

var motorTorque = 0.00;
var motorAccel = 0.00;
var motorSpeed = 0.00;
var steeringAngle = 0.00;

if(frontWheelDrive) scriptWheelFL.driven = scriptWheelFR.driven = true;
if(middleWheelDrive) scriptWheelML.driven = scriptWheelMR.driven = true;
if(rearWheelDrive) scriptWheelBL.driven = scriptWheelBR.driven = true;

function FixedUpdate ()
{
	steeringInput = Input.GetAxis("Horizontal");
	motorInput = Input.GetAxis("Vertical");

	if(frontWheelSteering) wheelFL.localRotation = wheelFR.localRotation = Quaternion.LookRotation(Vector3(steeringInput * (steeringAngle / 90), 0, 1 + (-1 * Mathf.Abs(steeringInput * (steeringAngle / 90))) ));
	if(middleWheelSteering) wheelML.localRotation = wheelMR.localRotation = Quaternion.LookRotation(Vector3(-steeringInput * (steeringAngle / 90), 0, 1 + (-1 * Mathf.Abs(steeringInput * (steeringAngle / 90))) ));
	if(rearWheelSteering) wheelBL.localRotation = wheelBR.localRotation = Quaternion.LookRotation(Vector3(-steeringInput * (steeringAngle / 90), 0, 1 + (-1 * Mathf.Abs(steeringInput * (steeringAngle / 90))) ));

	if(frontWheelDrive || middleWheelDrive || rearWheelDrive)
	{
		motorTorque = Mathf.Lerp(maxTorque / 30, minTorque / 30, motorSpeed / maxMotorSpeed) * Mathf.Abs(motorInput);
		if(motorTorque < 1) motorTorque = 1;
		motorAccel = Mathf.Lerp(maxAcceleration, 0, motorSpeed / maxMotorSpeed);
		steeringAngle = Mathf.Lerp(maxSteeringAngle, minSteeringAngle, rigidbody.velocity.magnitude / highSpeed);

		motorSpeed += motorInput * motorAccel / motorMass * Time.fixedDeltaTime;

		if(frontWheelDrive)
		{
			scriptWheelFL.speed = scriptWheelFR.speed = motorSpeed;
		}

		if(middleWheelDrive)
		{
			scriptWheelML.speed = scriptWheelMR.speed = motorSpeed;
		}

		if(rearWheelDrive)
		{
			scriptWheelBL.speed = scriptWheelBR.speed = motorSpeed;
		}

		motorSpeed += -motorSpeed * motorDrag / motorTorque * Time.fixedDeltaTime;
	}
}

//Automatically shift gears
function AutomaticTransmission()
{
	if(gear>0)
	{
		if(engineRPM>shiftUpRPM&&gear<gearRatios.length-1)
			gear++;
		if(engineRPM<shiftDownRPM&&gear>1)
			gear--;
	}
}

function AddForceOnMotor (force : float)
{
	motorSpeed += force / motorTorque;
}