using UnityEngine;

public class SceneViewCamera : MonoBehaviour
{
    [Header("移动设置")]
    public float moveSpeed = 10f;
    public float fastMoveMultiplier = 2f;
    public float elevationSpeed = 5f;

    [Header("旋转设置")]
    public float rotationSpeed = 180f;
    public float minVerticalAngle = -89f;
    public float maxVerticalAngle = 89f;

    [Header("限制设置")]
    public float minHeight = 0.5f;

    private Vector3 currentRotation;
    private bool isRotating = false;
    private Vector3 lastMousePosition;

    void Start()
    {
        // 初始化当前旋转角度
        currentRotation = transform.eulerAngles;

        // 锁定鼠标到屏幕中心（可选）
        // Cursor.lockState = CursorLockMode.Confined;
    }

    void Update()
    {
        HandleRotation();
        HandleMovement();
        ApplyConstraints();
    }

    void HandleRotation()
    {
        // 鼠标右键按下时开始旋转
        if (Input.GetMouseButtonDown(1))
        {
            isRotating = true;
            lastMousePosition = Input.mousePosition;
            // 隐藏鼠标指针
            Cursor.visible = false;
        }

        // 鼠标右键抬起时停止旋转
        if (Input.GetMouseButtonUp(1))
        {
            isRotating = false;
            // 显示鼠标指针
            Cursor.visible = true;
        }

        // 执行旋转
        if (isRotating)
        {
            Vector3 mouseDelta = Input.mousePosition - lastMousePosition;

            // 计算旋转量
            float rotationX = mouseDelta.y * rotationSpeed * Time.deltaTime;
            float rotationY = mouseDelta.x * rotationSpeed * Time.deltaTime;

            // 更新旋转角度（注意：X轴对应上下看，Y轴对应左右看）
            currentRotation.x = Mathf.Clamp(currentRotation.x - rotationX, minVerticalAngle, maxVerticalAngle);
            currentRotation.y += rotationY;

            // 应用旋转
            transform.rotation = Quaternion.Euler(currentRotation);

            lastMousePosition = Input.mousePosition;
        }
    }

    void HandleMovement()
    {
        // 计算移动速度（考虑加速）
        float currentMoveSpeed = moveSpeed;
        if (Input.GetKey(KeyCode.LeftShift) || Input.GetKey(KeyCode.RightShift))
        {
            currentMoveSpeed *= fastMoveMultiplier;
        }

        // 获取输入
        float horizontal = Input.GetAxis("Horizontal"); // A/D 或 左右箭头
        float vertical = Input.GetAxis("Vertical");     // W/S 或 上下箭头

        // 计算移动方向（基于相机当前朝向）
        Vector3 moveDirection = Vector3.zero;

        if (vertical != 0)
        {
            moveDirection += transform.forward * vertical;
        }

        if (horizontal != 0)
        {
            moveDirection += transform.right * horizontal;
        }

        // 垂直移动 (Q/E)
        if (Input.GetKey(KeyCode.Q))
        {
            moveDirection += Vector3.down * elevationSpeed * Time.deltaTime;
        }
        if (Input.GetKey(KeyCode.E))
        {
            moveDirection += Vector3.up * elevationSpeed * Time.deltaTime;
        }

        // 应用移动
        if (moveDirection != Vector3.zero)
        {
            // 标准化移动方向以防止斜向移动更快
            if (moveDirection.magnitude > 1f)
            {
                moveDirection.Normalize();
            }

            transform.position += moveDirection * currentMoveSpeed * Time.deltaTime;
        }
    }

    void ApplyConstraints()
    {
        // 限制最低高度
        Vector3 position = transform.position;
        if (position.y < minHeight)
        {
            position.y = minHeight;
            transform.position = position;
        }
    }

    // 可选：在Inspector中显示当前状态
   
}