using System.Collections;
using System.Collections.Generic;
using Unity.VisualScripting;
using UnityEngine;
using static UnityEngine.GraphicsBuffer;

public class PlayerController : MonoBehaviour
{
    public Camera mainCamera; 
    public float rotationSpeed = 5f;  
    public float zoomSpeed = 10f;  
    public float minFov = 20f;  
    public float maxFov = 120;  

    private Vector3 lastMousePosition; public float distance = 5f;

    // Start is called before the first frame update
    void Start()
    {
        if (mainCamera == null)
        {
            mainCamera = Camera.main;  
        }
    }

    // Update is called once per frame
    void Update()
    {
        HandleRotation();

        HandleZoom();
    }

    // 通过鼠标拖动来旋转物体
    void HandleRotation()
    {
        if (Input.GetMouseButtonDown(0))  // 鼠标左键按下时记录鼠标位置
        {
            lastMousePosition = Input.mousePosition;
        }

        if (Input.GetMouseButton(0))  // 鼠标左键保持按下状态时
        {
            Vector3 delta = Input.mousePosition - lastMousePosition;  // 获取鼠标的移动距离

            float rotX = delta.x * rotationSpeed * Time.deltaTime;  // 水平旋转
            float rotY = -delta.y * rotationSpeed * Time.deltaTime;  // 垂直旋转

            // 计算新的旋转角度
            mainCamera.transform.RotateAround(transform.position, Vector3.up, rotX);  // 水平绕目标物体旋转
            mainCamera.transform.RotateAround(transform.position, mainCamera.transform.right, rotY);  // 垂直绕目标物体旋转

            // 更新摄像机的旋转后的位置
            Vector3 direction = (mainCamera.transform.position - transform.position).normalized;  // 获取摄像机指向目标物体的方向
            mainCamera.transform.position = transform.position + direction * distance;  // 根据旋转角度调整摄像机的位置

            lastMousePosition = Input.mousePosition;  // 更新上一帧的鼠标位置
        }
    }


    void HandleZoom()
    {
        float scrollInput = Input.GetAxis("Mouse ScrollWheel");  
        if (scrollInput != 0)
        {
 
            mainCamera.fieldOfView = Mathf.Clamp(mainCamera.fieldOfView - scrollInput * zoomSpeed, minFov, maxFov);
        }
    }
}