using UnityEngine;
using System.Collections;

public class car_Control : MonoBehaviour {

	public GameObject forcePoint;
	public Suspension[] supensions;
	//public Suspension supFR;
	//public Suspension supFL;
	//public Suspension supBR;
	//public Suspension supBL;
	public float speed;
	public float torque;
	public float grip;
	public float driftGrip;

	private float curGrip;

	public Vector3 centreOfMass;


	public Rigidbody carRigid;

	// Use this for initialization
	void Start () {
		carRigid = GetComponent<Rigidbody>();
		carRigid.centerOfMass = centreOfMass;

	}
	
	// Update is called once per frame
	void FixedUpdate () {
		carRigid.centerOfMass = centreOfMass;
		float inputX = Input.GetAxis ("Player1 Movement Y");
		float inputY = Input.GetAxis("Player1 Movement X");

		applyAcceleration (inputX);
		applyTorque (inputY);
		driftCheck ();
		applyGrip ();

	
	}

	void applyAcceleration(float input){
		Vector3 force = transform.forward * input * speed;
		//Vector3 rayNormal = (supensions[0].supHit.normal + supensions[1].supHit.normal + supensions[2].supHit.normal + supensions[3].supHit.normal) / 4;
		Vector3 rayNormal = suspensionNormal ();

		rayNormal = Quaternion.AngleAxis(90, transform.right) * rayNormal;
		Vector3 projectedForce = Vector3.Project (force, rayNormal);
		//carRigid.AddForceAtPosition (projectedForce,forcePoint.transform.position);
		carRigid.AddForce(projectedForce);
	}

	void applyTorque (float input){
		carRigid.AddTorque(transform.up * torque * input);
	}

	void driftCheck(){
		if (Input.GetButton ("Player1 Jump")) {
			curGrip = driftGrip;
		} else {
			curGrip = grip;
		}
	}

	void applyGrip(){

		float localVelX = transform.InverseTransformDirection(carRigid.velocity).x;
		bool grounded = false;

		for (int i = 0; i<supensions.Length; i++) {
			if (supensions[i].supcompressionRatio >0)
				grounded = true;
		}

		Debug.Log ("Grounded: " + grounded);
		if (grounded) {
			for (int i = 0; i<supensions.Length; i++) {
				carRigid.AddForceAtPosition (transform.right * -localVelX * curGrip, supensions [i].transform.position);
			}
		}

	}

	Vector3 suspensionNormal(){

		Vector3 normal = supensions[0].supHit.normal;
		for (int i = 1;i< supensions.Length; i++){
			normal += supensions[i].supHit.normal;
		}
		normal /= supensions.Length;

		return normal;
	}



}