using UnityEngine;

[RequireComponent(typeof(CharacterController))]
public class SimpleFPSController : MonoBehaviour
{
    [SerializeField] private Camera playerCamera;
    [SerializeField] private float moveSpeed = 5f;
    [SerializeField] private float mouseSensitivity = 2f;
    [SerializeField] private float gravity = -20f;
    [SerializeField] private bool allowJump = true;
    [SerializeField] private float jumpHeight = 1.2f;

    private CharacterController characterController;
    private float verticalVelocity;
    private float cameraPitch;

    public void Configure(Camera targetCamera)
    {
        playerCamera = targetCamera;
    }

    private void Awake()
    {
        characterController = GetComponent<CharacterController>();

        if (playerCamera == null)
        {
            playerCamera = GetComponentInChildren<Camera>();
        }
    }

    private void Start()
    {
        GameUIState.Reset();
    }

    private void Update()
    {
        HandleLook();
        HandleMovement();
    }

    private void OnApplicationFocus(bool hasFocus)
    {
        if (hasFocus)
        {
            GameUIState.SyncCursorAndTime();
        }
    }

    private void HandleLook()
    {
        if (GameUIState.IsAnyBlockingUIOpen || playerCamera == null)
        {
            return;
        }

        var mouseX = Input.GetAxis("Mouse X") * mouseSensitivity;
        var mouseY = Input.GetAxis("Mouse Y") * mouseSensitivity;

        cameraPitch -= mouseY;
        cameraPitch = Mathf.Clamp(cameraPitch, -80f, 80f);

        playerCamera.transform.localRotation = Quaternion.Euler(cameraPitch, 0f, 0f);
        transform.Rotate(Vector3.up * mouseX);
    }

    private void HandleMovement()
    {
        if (characterController == null)
        {
            return;
        }

        if (characterController.isGrounded && verticalVelocity < 0f)
        {
            verticalVelocity = -2f;
        }

        if (!GameUIState.IsAnyBlockingUIOpen)
        {
            var horizontal = Input.GetAxisRaw("Horizontal");
            var vertical = Input.GetAxisRaw("Vertical");
            var moveDirection = (transform.right * horizontal + transform.forward * vertical).normalized;

            characterController.Move(moveDirection * moveSpeed * Time.deltaTime);

            if (allowJump && Input.GetButtonDown("Jump") && characterController.isGrounded)
            {
                verticalVelocity = Mathf.Sqrt(jumpHeight * -2f * gravity);
            }
        }

        verticalVelocity += gravity * Time.deltaTime;
        characterController.Move(Vector3.up * verticalVelocity * Time.deltaTime);
    }
}