using UnityEngine;
using System.Collections;

public class MouseLookPlus : MonoBehaviour {
  public float xSpeed = 12.0f;
  public float ySpeed = 12.0f;
   
  public Transform target;
   
  public float scrollSpeed = 12.0f;
   
  public float zoomMin = 1.0f;
  public float zoomMax = 20.0f;
   
  public float distance = 2;
   
  public float Ypos;
   
  public Vector3 position;
  public bool isActivated;
   
  float x=0.0f;
  float y=0.0f;
   
  void Start () {
   Vector3 angles = transform.eulerAngles;
   x = angles.y;
   y = angles.x;
   position = -(transform.forward*distance)+target.position;
   transform.position=position;
   Ypos = transform.position.y;
  }
  void LateUpdate () {
   if (Input.GetMouseButtonDown(1)) {
    isActivated = true;
   }
   if (Input.GetMouseButtonUp(1)) {
    isActivated = false;
   }
    
    
   if (target && isActivated) {
    x+= Input.GetAxis("Mouse X") * xSpeed;
    y-= Input.GetAxis("Mouse Y") * ySpeed;
     
    transform.RotateAround(target.position, transform.up, x);
    transform.RotateAround(target.position, transform.right, y);
    
    Transform.rotation = Quaternion.Euler(transform.rotation.x,transform.rotation.y,0);  
    Transform.rotation = Quaternion.LookRotation(target.position - transform.position);
     
    Ypos = transform.position.y;
     
    x=0;
    y=0;
   }else {
    if (Input.GetAxis("Mouse ScroolWheel") !=0) {
     distance = Vector3.Distance(transform.position,target.position);
    distance = ZoomLimit(distance - Input.GetAxis("MouseScrollWheel")*scrollSpeed, zoomMin, zoomMax);
    position = -(transform.forward*distance)+target.position;
    position.y=Ypos;
    transform.position=position;
    }
   }
  float d2 = Vector3.Distance(transform.position, target.position);

  if  (d2 != distance) {
   position = -(Transform.forward*distance) + target.position;  
      position.y = Ypos;  
      transform.position = position;  
   }
   
  }
  public static float zoomLimit(float dist, float min, float max){  
    if (dist<min)  
      dist=min;  
     if(dist>max)  
      dist=max;  
     return dist;  
    }  
  }