using Unity.VisualScripting;
using UnityEngine;

public class FirstPersonController : MonoBehaviour
{
    [Header("Movement Settings")]
    public float walkSpeed = 50f;
    public float runSpeed  = 80f;
    public float jumpHeight = 2.5f;
    public float gravity   = -20f;

    [Header("Mouse Look Settings")]
    public float mouseSensitivity = 3f;
    public float maxLookAngle     = 90f;

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

    // Private variables
    private CharacterController controller;
    private Inventory           inventory;
    private Player              player;
    private Vector3             velocity;
    private bool                isGrounded;
    private float               xRotation = 0f;

    void Start()
    {
        Time.timeScale = 1f;

        controller = GetComponent<CharacterController>();
        if (controller == null)
        {
            Debug.LogError("FirstPersonController: No CharacterController found!");
            return;
        }

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

        inventory = GetComponent<Inventory>();
        player    = GetComponent<Player>();

        Cursor.lockState = CursorLockMode.Locked;
        Cursor.visible   = false;
    }

    void Update()
    {
        if (controller == null) return;

        isGrounded = controller.isGrounded;

        if (isGrounded && velocity.y < 0)
            velocity.y = -2f;

        float moveX = 0f, moveZ = 0f;
        if (Input.GetKey(KeyCode.W)         || Input.GetKey(KeyCode.UpArrow))    moveZ += 1f;
        if (Input.GetKey(KeyCode.S)         || Input.GetKey(KeyCode.DownArrow))  moveZ -= 1f;
        if (Input.GetKey(KeyCode.A)         || Input.GetKey(KeyCode.LeftArrow))  moveX -= 1f;
        if (Input.GetKey(KeyCode.D)         || Input.GetKey(KeyCode.RightArrow)) moveX += 1f;

        Vector3 move = transform.right * moveX + transform.forward * moveZ;
        if (move.magnitude > 1f) move.Normalize();

        bool wantSprint  = Input.GetKey(KeyCode.LeftShift) && move.magnitude > 0f;
        bool isSprinting = wantSprint && (player == null || player.CanSprint());
        if (player != null) player.isSprinting = isSprinting;

        float currentSpeed = isSprinting ? runSpeed : walkSpeed;
        controller.Move(move * currentSpeed * Time.deltaTime);

        if (Input.GetKey(KeyCode.Space) && isGrounded)
            velocity.y = Mathf.Sqrt(jumpHeight * -2f * gravity);

        velocity.y += gravity * Time.deltaTime;
        controller.Move(new Vector3(0f, velocity.y, 0f) * Time.deltaTime);

        bool inventoryOpen = inventory != null && inventory.IsOpen;
        if (!inventoryOpen)
            HandleMouseLook();

        if (Input.GetKeyDown(KeyCode.Escape))
        {
            Cursor.lockState = CursorLockMode.None;
            Cursor.visible   = true;
        }

        if (Input.GetMouseButtonDown(0) && Cursor.lockState == CursorLockMode.None && !inventoryOpen)
        {
            Cursor.lockState = CursorLockMode.Locked;
            Cursor.visible   = false;
        }
    }

    void HandleMouseLook()
    {
        float mouseX = Input.GetAxis("Mouse X") * mouseSensitivity;
        float mouseY = Input.GetAxis("Mouse Y") * mouseSensitivity;

        xRotation -= mouseY;
        xRotation  = Mathf.Clamp(xRotation, -maxLookAngle, maxLookAngle);
        playerCamera.transform.localRotation = Quaternion.Euler(xRotation, 0f, 0f);
        transform.Rotate(Vector3.up * mouseX);
    }
}