using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.Networking;
using UnityEngine.UI;
using System;
using System.Collections;
using TMPro;

public class CameraControl1 : MonoBehaviour
{
    
    public static CameraControl1 ins;
    [Header("设置参数")]
    [SerializeField] float minDis = 2;
     [SerializeField]  float maxDis ;
    [SerializeField] float mouseRotSpeed = 8;
    [SerializeField] float touchZoomSpeed = 0.1f;
    [SerializeField] float touchRotateSpeed = 0.3f;
    [SerializeField] float mouseMoveSpeed = 1;
    [SerializeField] float mouseZoomSpeed = 10;
    [SerializeField] float rSmoothTime = 0.3f;
    [SerializeField] float sSmoothTime = 0.3f;
    [SerializeField] float mSmoothTime = 0.3f;
    [SerializeField] float minVerticalAngle = 0;
    [SerializeField] float maxVerticalAngle = 60;
    [Header("用于展示数据")]
    [SerializeField] float horizontalAngle = 0;
    [SerializeField] float verticalAngle = 0;
    [SerializeField] float currentDis = 80;
    [SerializeField] Vector3 originPosition;
    [SerializeField] Vector3 targetPosition;
    //[HideInInspector] public bool isrotateend;
    bool isrotateable;
    bool isscaleable;
    float _targetDis;
    private Touch oldTouch1;
    private Touch oldTouch2;
    // 
    public bool UPDOWN = false;


    float targetDis
    {
        set
        {
            _targetDis = value > maxDis ? maxDis : value < minDis ? minDis : value;
        }
        get { return _targetDis; }
    }
    Vector3 rVelocity = Vector3.zero;
    float sVelocity = 0;
    Vector3 mVelocity = Vector3.zero;
    Vector3 dampRotation;
    Transform targetTrans;
    bool m_IsSingleFinger;
    private void Awake()
    {
        ins = this;
        targetDis = currentDis;
        targetPosition = originPosition;
    }

    [ContextMenu("设置相机位置")]
    private void SetCameraTrans()
    {
        transform.eulerAngles = new Vector3(verticalAngle, horizontalAngle, 0);
        var offset = transform.forward * -currentDis;
        transform.position = originPosition + offset;
    }
    public void SetTarget(Transform target, float distance = 4)
    {
        targetDis = distance;
        targetTrans = target;
    }
    public void SetCenterPoint(Vector3 target, float distance = 4)
    {
        targetDis = distance;
        targetPosition = target;
    }
    public void Recover(float max, float min)
    {

        // targetPosition = originPosition = Vector3.zero;
        horizontalAngle -= horizontalAngle % 360;
        verticalAngle = 0;
        maxDis = max;
        minDis = min;
        targetDis = maxDis;
        // targetTrans = null;
    }
    public void RecoverTwo()
    {
        horizontalAngle -= horizontalAngle % 360;
        verticalAngle = 0;
        targetDis = maxDis;
    }
    
  
    private void Update()
    {
        //限制视角上下
        if (UPDOWN)
        {
            if (verticalAngle < -15)
            {
                verticalAngle = -15;
            }
        }
       
        if (Input.touchCount == 0)
        {
            //  isscaleable  = true;
            isrotateable = true;
            if (Input.GetMouseButton(0))
            {
                horizontalAngle += Input.GetAxis("Mouse X") * mouseRotSpeed;
                verticalAngle -= Input.GetAxis("Mouse Y") * mouseRotSpeed;

                verticalAngle = Mathf.Clamp(verticalAngle, minVerticalAngle, maxVerticalAngle);
            }
            targetDis = targetDis - Input.GetAxis("Mouse ScrollWheel") * mouseZoomSpeed;
        }

        if (Input.touchCount == 1)
        {
            if (isrotateable)
            {
                if (Input.touches[0].phase == TouchPhase.Began)
                {
                    oldTouch1 = Input.touches[0];
                }
                var deltaPos = Input.touches[0].position - oldTouch1.position;
                horizontalAngle += deltaPos.x * touchRotateSpeed*3f ;
                verticalAngle -= deltaPos.y * touchRotateSpeed;
                verticalAngle = Mathf.Clamp(verticalAngle, minVerticalAngle, maxVerticalAngle);
                oldTouch1 = Input.touches[0];
            }
        }
        if (Input.touchCount == 2)
        {
            isrotateable = false ;
            if (Input.touches[1].phase == TouchPhase.Began)
            {
                oldTouch1 = Input.touches[0];
                oldTouch2 = Input.touches[1];
            }
            float currentTouchDistance = Vector2.Distance(Input.touches[0].position, Input.touches[1].position);
            float lastTouchDistance = Vector2.Distance(oldTouch1.position, oldTouch2.position);
            if (Input.touches[0].phase != TouchPhase.Ended && Input.touches[1].phase != TouchPhase.Ended)
            {
                //计算上次和这次双指触摸之间的距离差距  
                //然后去更改摄像机的距离  
                targetDis -= (currentTouchDistance - lastTouchDistance) * touchZoomSpeed;
                oldTouch1 = Input.touches[0];
                oldTouch2 = Input.touches[1];
            }
        }

        currentDis = Mathf.SmoothDamp(currentDis, targetDis, ref sVelocity, rSmoothTime);
        dampRotation = Vector3.SmoothDamp(dampRotation, new Vector3(verticalAngle, horizontalAngle), ref rVelocity, rSmoothTime);
        transform.rotation = Quaternion.Euler(dampRotation);
        if (targetTrans != null)
        {
            if (originPosition != targetTrans.position)
                originPosition = Vector3.SmoothDamp(originPosition, targetTrans.position, ref mVelocity, mSmoothTime);
        }
        else
        {
            if (originPosition != targetPosition)
                originPosition = Vector3.SmoothDamp(originPosition, targetPosition, ref mVelocity, mSmoothTime);
        }
        var offset = transform.forward * -currentDis;
        transform.position = originPosition + offset;
    }

}