using UnityEngine;

public class FlyCamera : MonoBehaviour
{
    public float movementSpeed = 10.0f; // 基础移动速度
    public float fastSpeed = 50.0f;     // 加速移动速度（按住 Shift）
    public float mouseSensitivity = 3.0f; // 鼠标灵敏度

    private float yaw = 0.0f; // 水平旋转角度
    private float pitch = 0.0f; // 垂直旋转角度

    void Start()
    {
        // 锁定并隐藏鼠标光标
        Cursor.lockState = CursorLockMode.Locked;
        Cursor.visible = false;
    }

    void Update()
    {
        // 鼠标控制视角
        float mouseX = Input.GetAxis("Mouse X") * mouseSensitivity;
        float mouseY = Input.GetAxis("Mouse Y") * mouseSensitivity;

        yaw += mouseX;
        pitch -= mouseY;
        pitch = Mathf.Clamp(pitch, -90f, 90f); // 限制垂直旋转角度

        transform.eulerAngles = new Vector3(pitch, yaw, 0.0f);

        // 键盘控制移动
        float currentSpeed = Input.GetKey(KeyCode.LeftShift) ? fastSpeed : movementSpeed;
        Vector3 direction = new Vector3();

        if (Input.GetKey(KeyCode.W))
            direction += transform.forward;
        if (Input.GetKey(KeyCode.S))
            direction -= transform.forward;
        if (Input.GetKey(KeyCode.A))
            direction -= transform.right;
        if (Input.GetKey(KeyCode.D))
            direction += transform.right;
        if (Input.GetKey(KeyCode.Space))
            direction += transform.up;
        if (Input.GetKey(KeyCode.LeftControl))
            direction -= transform.up;

        transform.position += direction.normalized * currentSpeed * Time.deltaTime;
    }
}