using UnityEngine;
using System.Collections;


[ExecuteInEditMode]
public class CameraController : MonoBehaviour {
	public bool Active = false;
	public float sensitivity = 2F;

	float rotationY = 0F;
	
	Vector3 Speed = new Vector3();
	public float MaxSpeed = 10f;
	public float AccelerationTime = 1f;
	public float BrakingTime = 0.5f;
	
	
	void Start ()
	{
		rotationY = -transform.localEulerAngles.x;
	}
	
	void Update ()
	{
		if(Input.GetKeyDown("mouse 1")){
			Active = !Active;
		}
		

		
		if (!Active) return;
		
		
		
	
		float rotationX = transform.localEulerAngles.y + Input.GetAxis("Mouse X") * sensitivity;
			
		rotationY += Input.GetAxis("Mouse Y") * sensitivity;
		rotationY = Mathf.Clamp (rotationY, -90, 90);
		
		transform.localEulerAngles = new Vector3(-rotationY, rotationX, 0);
		
		
		Vector3 AccelerationForce = new Vector3(
			((Input.GetKey("d")? 1f:0f)-(Input.GetKey("a")? 1f:0f)),
			((Input.GetKey("space")? 1f:0f)-(Input.GetKey("left ctrl")? 1f:0f)),
			((Input.GetKey("w")? 1f:0f)-(Input.GetKey("s")? 1f:0f))
		);
		AccelerationForce *= (Time.deltaTime/AccelerationTime);
		Speed += AccelerationForce;
		
		Vector3 BrakingForce = new Vector3(
			(Input.GetKey("d")|Input.GetKey("a"))? 0f:1f,
			(Input.GetKey("space")|Input.GetKey("left ctrl"))? 0f:1f,
			(Input.GetKey("w")|Input.GetKey("s"))? 0f:1f
		);
		
		BrakingForce *= (Time.deltaTime/BrakingTime);
		
		
	
		Speed.Set(
			Speed.x-(Mathf.Sign(Speed.x)*Mathf.Min(BrakingForce.x,Mathf.Abs(Speed.x))),
			Speed.y-(Mathf.Sign(Speed.y)*Mathf.Min(BrakingForce.y,Mathf.Abs(Speed.y))),
			Speed.z-(Mathf.Sign(Speed.z)*Mathf.Min(BrakingForce.z,Mathf.Abs(Speed.z))));
		
		Speed.Set(
			Mathf.Clamp(Speed.x,-1f,1f),
			Mathf.Clamp(Speed.y,-1f,1f),
			Mathf.Clamp(Speed.z,-1f,1f));
		
		
		transform.Translate(Time.deltaTime*Speed*MaxSpeed,Space.Self);
	}
	

}