using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using UnityEngine;




using System.Runtime.InteropServices;



public class Smooth3DCamera : MonoBehaviour
{

    public GameObject donahua1, donahua2, donahua3, donahua4, donahua5, donahua6, donahua7, donahua8, donahua9, donahua10, donahua11, donahua12, donahua13, donahua14, donahua15, donahua16, donahua17, donahua18, donahua19;
    public Transform pivot;
    public float distance = 10.0f;
    public float minDistance = 2f;
    public float maxDistance = 15f;
    public float zoomSpeed = 1f;
    public float xSpeed = 250.0f;
    public float ySpeed = 250.0f;
    public bool allowYTilt = true;
    public float yMinLimit = -90f;
    public float yMaxLimit = 90f;
    private float x = 0.0f;
    private float y = 0.0f;
    private float targetX = 0f;
    private float targetY = 0f;
    public float targetDistance = 0f;
    private float xVelocity = 1f;
    private float yVelocity = 1f;
    private float zoomVelocity = 1f;

    private void Start()
    {
  //      donahua1.SetActive(false);
  //      donahua2.SetActive(false);
    //    donahua3.SetActive(false);
   //     donahua3.SetActive(false);
     //   donahua4.SetActive(false);
     //   donahua5.SetActive(false);
     //   donahua6.SetActive(false);
      //  donahua7.SetActive(false);
      //  donahua8.SetActive(false);
   //     donahua9.SetActive(false);
   //     donahua10.SetActive(false);
    //    donahua11.SetActive(false);
    //    donahua12.SetActive(false);
     //   donahua13.SetActive(false);
     //   donahua14.SetActive(false);
     //   donahua15.SetActive(false);
     //  donahua16.SetActive(false);
      //  donahua17.SetActive(false);
      //  donahua18.SetActive(false);
      //  donahua19.SetActive(false);








        var angles = transform.eulerAngles;
        targetX = x = angles.y;
        targetY = y = angles.x;
        targetDistance = distance;
    }


    public void  Donghua(int a)
    {
        switch(a)
        {
            case 1 :
                pivot = donahua1.transform;
                donahua1.SetActive(true);
                break;
            case 2:
                pivot = donahua2.transform;
                donahua2.SetActive(true);
                break;
            case 3:
                pivot = donahua3.transform;
                donahua3.SetActive(true);
                break;
            case 4:
                pivot = donahua4.transform;
                donahua4.SetActive(true);
                break;
            case 5:
                pivot = donahua5.transform;
                donahua5.SetActive(true);
                break;
            case 6:
                pivot = donahua6.transform;
                donahua6.SetActive(true);
                break;
            case 7:
                pivot = donahua7.transform;
                donahua7.SetActive(true);
                break;
            case 8:
                pivot = donahua8.transform;
                donahua8.SetActive(true);
                break;
            case 9:
                pivot = donahua9.transform;
                donahua9.SetActive(true);
                break;
            case 10:
                pivot = donahua10.transform;
                donahua10.SetActive(true);
                break;
            case 11:
                pivot = donahua11.transform;
                donahua11.SetActive(true);
                break;
            case 12:
                pivot = donahua12.transform;
                donahua12.SetActive(true);
                break;
            case 13:
                pivot = donahua13.transform;
                donahua13.SetActive(true);
                break;
            case 14:
                pivot = donahua14.transform;
                donahua14.SetActive(true);
                break;
            case 15:
                pivot = donahua15.transform;
                donahua15.SetActive(true);
                break;
            case 16:
                pivot = donahua16.transform;
                donahua16.SetActive(true);
                break;
            case 17:
                pivot = donahua17.transform;
                donahua17.SetActive(true);
                break;
            case 18:
                pivot = donahua18.transform;
                donahua18.SetActive(true);
                break;
   

        }



    }



    private void LateUpdate()
    {

        if (!pivot) return;

        if (Input.GetAxis("Mouse ScrollWheel") > 0.0f)
        {
            targetDistance -= zoomSpeed;
        }
        else if (Input.GetAxis("Mouse ScrollWheel") < 0.0f)
        {
            targetDistance += zoomSpeed;
        }
        targetDistance = Mathf.Clamp(targetDistance, minDistance, maxDistance);
        if (Input.GetMouseButton(0))
        {
            targetX += Input.GetAxis("Mouse X") * xSpeed * 0.02f;
            if (allowYTilt)
            {
                targetY -= Input.GetAxis("Mouse Y") * ySpeed * 0.02f;
                targetY = ClampAngle(targetY, yMinLimit, yMaxLimit);
            }
        }
        x = Mathf.SmoothDampAngle(x, targetX, ref xVelocity, 0.3f);
        y = allowYTilt ? Mathf.SmoothDampAngle(y, targetY, ref yVelocity, 0.3f) : targetY;
        Quaternion rotation = Quaternion.Euler(y, x, 0);
        //Debug.Log(rotation);
        distance = Mathf.SmoothDamp(distance, targetDistance, ref zoomVelocity, 1f);
        Vector3 position = rotation * new Vector3(0.0f, 0.0f, -distance) + pivot.position;
        transform.rotation = rotation;
        transform.position = position;
    }


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