using UnityEngine;
using System.Collections;

#region///=====================Камера следящая ха обьектом====
  // beril(11.02): добавить маштабирование
  //
  ///=================Описание======================
/*Камера перемещается за target
  *  
  *  
  * */
#endregion
public class CameraFolowing : MonoBehaviour{
     [HideInInspector]
  public GameObject target; //цель за которой следуем
     public float xSpeed; //
  public float ySpeed; //
  public float yMinLimit; //минимальное значение
  public float yMaxLimit; //максимальное значение
   
     public float scrollSpeed; //скорость прокрутки
  public float zoomMin;  //зум минимальный
  public float zoomMax; //зум максимальный
   
   
  private float distance;
  private float distanceLerp;
  private Vector3 position;  
     private bool isActivated;
     private float x;
  private float y;
  private bool setupCamera;

    
   
     void Start () {
    
    
   //если цель не задана
   if(target == null)
   {
    target = GameObject.FindGameObjectWithTag("Player");
     
    if(target == null)
    {
     Debug.LogWarning("Don't found player tag please change player tag to Player");  
    }
   }
    
          
   //устанавливаем позицию
    Vector3 angles = transform.eulerAngles;
    x = angles.y;
    y = angles.x;
      
   CalDistance();
     }
   
   
   
     void LateUpdate () {
     
   ScrollMouse();
   RotateCamera();
   
  }
   
  //вращение камеры
  void RotateCamera()
  {
   if (Input.GetMouseButtonDown(1)){
   
    isActivated = true;
   
   }  
   
    
   if (Input.GetMouseButtonUp(1))
   {
    isActivated = false;
   }  
   
   
   
      if (target && isActivated) {  
     
     y -= Input.GetAxis("Mouse Y") * ySpeed;

     x += Input.GetAxis("Mouse X") * xSpeed;

           
    
        y = ClampAngle(y, yMinLimit, yMaxLimit);
    
    
         Quaternion rotation = Quaternion.Euler(y, x, 0);
     
    Vector3 calPos = new Vector3(0, 0, -distanceLerp);

           position = rotation * calPos + target.transform.position;
    
          transform.rotation = rotation;
    
          transform.position = position;
   
   
   } else
   {
    Quaternion rotation = Quaternion.Euler(y, x, 0);
     
    Vector3 calPos = new Vector3(0, 0, -distanceLerp);

           position = rotation * calPos + target.transform.position;
    
          transform.rotation = rotation;
    
          transform.position = position;
   }
  }
   
   //выцесляем направление
   void CalDistance()
  {
   distance = zoomMax;
   distanceLerp = distance;
   Quaternion rotation = Quaternion.Euler(y, x, 0);  
   Vector3 calPos = new Vector3(0, 0, -distanceLerp);
      position = rotation * calPos + target.transform.position;
      transform.rotation = rotation;
      transform.position = position;
  }
   
   
  void ScrollMouse()
  {
   distanceLerp = Mathf.Lerp(distanceLerp,distance,Time.deltaTime * 5);
   if (Input.GetAxis("Mouse ScrollWheel") != 0)  
    {  
     // get the distance between camera and target
   
     distance = Vector3.Distance (transform.position , target.transform.position);  
   
     distance = ScrollLimit(distance - Input.GetAxis("Mouse ScrollWheel")*scrollSpeed, zoomMin, zoomMax);
   
    }
  }
   
    
  float ScrollLimit(float dist, float min, float max)
     {
         if (dist < min)
   
             dist= min;
   
         if (dist > max)
   
             dist= max;  
   
   return dist;
     }
   
   
   
  float ClampAngle(float angle,float min,float max)
  {
   if(angle < -360)
    angle += 360;
   if(angle > 360)
    angle -= 360;
   return Mathf.Clamp(angle,min,max);
  }
}