//WowCamera.js

//When the camera hits something, it "instantly" gets behind the player. 

//Credits to this script: "matrix211v1"
//found at: http://forum.unity3d.com/threads/16949-WOW-Camera-Movement/page2

var target : Transform;

var targetHeight = 12.0;
var distance = 5.0;

var maxDistance = 20;
var minDistance = 2.5;

var xSpeed = 250.0;
var ySpeed = 120.0;

var yMinLimit = -20;
var yMaxLimit = 80;

var zoomRate = 20;

var rotationDampening = 3.0;

var theta2 : float = 0.5;

private var x = 0.0;
private var y = 0.0;

private var fwd = new Vector3();
private var rightVector = new Vector3();
private var upVector = new Vector3();
private var movingVector = new Vector3();
private var collisionVector = new Vector3();
private var isColliding : boolean = false;
   
private var a1 = new Vector3();
private var b1 = new Vector3();
private var c1 = new Vector3();
private var d1 = new Vector3();
private var e1 = new Vector3();
private var f1 = new Vector3();
private var h1 = new Vector3();
private var i1 = new Vector3();

@script AddComponentMenu("Camera-Control/WoW Camera")

function Start () {
    var angles = transform.eulerAngles;
    x = angles.y;
    y = angles.x;

   // Make the rigid body not change rotation
      if (rigidbody)
      rigidbody.freezeRotation = true;
}

function LateUpdate () {
   if(!target)
      return;
   
   // If either mouse buttons are down, let them govern camera position
   if (Input.GetMouseButton(0) || Input.GetMouseButton(1))
   {
   x += Input.GetAxis("Mouse X") * xSpeed * 0.02;
   y -= Input.GetAxis("Mouse Y") * ySpeed * 0.02;
   
   // otherwise, ease behind the target if any of the directional keys are pressed
   } else if(Input.GetAxis("Vertical") || Input.GetAxis("Horizontal")) {
      var targetRotationAngle = target.eulerAngles.y;
      var currentRotationAngle = transform.eulerAngles.y;
      x = Mathf.LerpAngle(currentRotationAngle, targetRotationAngle, rotationDampening * Time.deltaTime);
   }
   
   distance -= (Input.GetAxis("Mouse ScrollWheel") * Time.deltaTime) * zoomRate * Mathf.Abs(distance);
   distance = Mathf.Clamp(distance, minDistance, maxDistance);
   
   y = ClampAngle(y, yMinLimit, yMaxLimit);
   
   var rotation:Quaternion = Quaternion.Euler(y, x, 0);
   var position = target.position - (rotation * Vector3.forward * distance + Vector3(0,-targetHeight,0));
   
   // Check to see if we have a collision
   collisionVector = AdjustLineOfSight(transform.position, position);
   
   // Check Line Of Sight
   if (collisionVector != Vector3.zero)
   {
      Debug.Log("Check Line Of Sight");
       a1 = transform.position;
      b1 = position;
      c1 = AdjustLineOfSight(transform.position, position);
      d1 = c1 - a1;
      e1 = d1.normalized * -1;
      f1 = d1 + e1 * 1;
      g1 = f1 + a1;
      position = g1;

      // check distance player to camera
      h1 = position - a1;
      if (h1.magnitude < 10)
      {
         position = a1 - fwd * 4;
         //position.y = targetPlayer.y;
         theta2 = theta2 + .25;
      }
      
      // set new camera distance
      h1 = position - a1;
      distance = h1.magnitude;
   }

   // check collision
   if (Physics.CheckSphere (position, .5) )
   {
       a1 = transform.position;
      
      newPosition = a1 - fwd * 4;
      //newPosition.y = targetPlayer.y;
      theta2 = theta2 + .25;
      
      // set new camera distance
      h1 = position - a1;
      distance = h1.magnitude;
   }   
   
   //position = Vector3.Slerp(transform.position, position, Time.deltaTime * 100);   
   
   transform.rotation = rotation;
   transform.position = position;
}

static function ClampAngle (angle : float, min : float, max : float) {
   if (angle < -360)
      angle += 360;
   if (angle > 360)
      angle -= 360;
   return Mathf.Clamp (angle, min, max);
}

function AdjustLineOfSight (vecA: Vector3, vecB: Vector3)
{
      var hit: RaycastHit;
    
      if (Physics.Linecast (vecA, vecB, hit))
      {
         Debug.Log("I hit something");
         return hit.point;
      }
     
     return Vector3.zero;
}