using UnityEngine;

[RequireComponent(typeof(CharacterController))]
public class FirstPersonController : MonoBehaviour
{
    [Header("Movement")]
    public float walkSpeed = 4f;
    public float runSpeed  = 7f;
    public float gravity   = -12f;

    [Header("Look")]
    public float mouseSensitivity = 2f;
    public float touchSensitivity = 0.15f;
    public float maxPitch = 75f;

    [Header("References")]
    public Camera playerCamera;

    CharacterController _cc;
    float _pitch, _yaw, _vy;
    bool  _locked;
    int   _touchId = -1;
    Vector2 _lastTouch;

    void Start()
    {
        _cc  = GetComponent<CharacterController>();
        // Spawn at exact Spatial spawn point: (-0.36, 0, -2.34) facing south (~180°)
        // Y=0 → CharacterController places feet at floor; centre offset = height/2
        transform.position = new Vector3(-0.36f, 0f, -2.34f);
        _yaw = 180f; // facing south (into gallery), matching Spatial spawn rotation
    }

    void Update()
    {
        HandleLook();
        HandleMove();
    }

    void HandleLook()
    {
#if UNITY_WEBGL && !UNITY_EDITOR
        if (_locked) Apply(Input.GetAxis("Mouse X") * mouseSensitivity, Input.GetAxis("Mouse Y") * mouseSensitivity);
        else HandleTouch();
#else
        if (Input.GetMouseButton(1)) Apply(Input.GetAxis("Mouse X") * mouseSensitivity, Input.GetAxis("Mouse Y") * mouseSensitivity);
#endif
    }

    void Apply(float dx, float dy)
    {
        _yaw  += dx;
        _pitch = Mathf.Clamp(_pitch - dy, -maxPitch, maxPitch);
        transform.rotation = Quaternion.Euler(0, _yaw, 0);
        if (playerCamera) playerCamera.transform.localRotation = Quaternion.Euler(_pitch, 0, 0);
    }

    void HandleTouch()
    {
        for (int i = 0; i < Input.touchCount; i++)
        {
            var t = Input.GetTouch(i);
            if (t.phase == TouchPhase.Began && _touchId == -1) { _touchId = t.fingerId; _lastTouch = t.position; }
            else if (t.fingerId == _touchId)
            {
                if (t.phase == TouchPhase.Moved) { var d = t.position - _lastTouch; Apply(d.x * touchSensitivity, d.y * touchSensitivity); _lastTouch = t.position; }
                else if (t.phase == TouchPhase.Ended || t.phase == TouchPhase.Canceled) _touchId = -1;
            }
        }
    }

    void HandleMove()
    {
        float spd = Input.GetKey(KeyCode.LeftShift) ? runSpeed : walkSpeed;
        var dir = (transform.right * Input.GetAxisRaw("Horizontal") + transform.forward * Input.GetAxisRaw("Vertical")).normalized;
        if (_cc.isGrounded) _vy = -0.5f; else _vy += gravity * Time.deltaTime;
        _cc.Move((dir * spd + Vector3.up * _vy) * Time.deltaTime);
    }

    void OnApplicationFocus(bool f) { if (f) _locked = true; }
    public void OnPointerLockLost() => _locked = false;
}