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using UnityEngine;
using UnityEngine.InputSystem;

[RequireComponent(typeof(CharacterController))]
public class FPSController : MonoBehaviour
{
    [Header("References")]
    [SerializeField] private CharacterController characterController;
    [SerializeField] private Transform playerBody;
    [SerializeField] private Camera mainCamera;
    [Space]
    [Header("Player Movement")]
    [SerializeField] private float walkSpeed;
    [SerializeField] private float sprintSpeed;
    [SerializeField] private float jumpHeight;
    [Space]
    [Header("Gravity Settings")]
    [SerializeField] private float gravity;
    [Space]
    [Header("Ground Check Settings")]
    [SerializeField] private float groundCheckRadius;
    [SerializeField] private float groundCheckDistance;
    [SerializeField] private LayerMask groundLayer;
    [Space]
    [Header("Bools")]
    [SerializeField] private bool isGrounded;
    [Space]
    [Header("Input Action References")]
    [SerializeField] private InputActionReference moveAction;
    [SerializeField] private InputActionReference sprintAction;
    [SerializeField] private InputActionReference jumpAction;

   

    private Vector2 currentInput;
    private Vector3 moveDirection;
    private Vector3 velocity;
    

    private void Start()
    {
        Cursor.lockState = CursorLockMode.Locked;
        Cursor.visible = false;
    }


    private void Update()
    {
        HandleInput();
        HandleMovement();
        HandlePlayerRotation();
        HandleGravity();
        HandleGroundCheck();
        HandleJump();

    }

    
    private void HandleInput()
    {
        currentInput = moveAction.action.ReadValue<Vector2>();
        moveDirection = new Vector3(currentInput.x, 0, currentInput.y);
      
        
    }
   

   
    private void HandleMovement()
    {
        Vector3 cameraForward = mainCamera.transform.forward;
        Vector3 cameraRight = mainCamera.transform.right;

        cameraForward.y = 0;
        cameraRight.y = 0;
    
        cameraForward.Normalize();
        cameraRight.Normalize();

        moveDirection = cameraForward * currentInput.y + cameraRight * currentInput.x;

        bool isSprinting = sprintAction.action.IsPressed();
        float currentSpeed = isSprinting ? sprintSpeed : walkSpeed;
        // =  If Sprinting is true ? ( Use Sprint Speed ) : If False Use Walk Speed; 

        var moveVel = Time.deltaTime * currentSpeed * moveDirection;
        var gravityVel = Time.deltaTime * velocity;
        characterController.Move(moveVel + gravityVel);


    }


    private void HandlePlayerRotation()
    {
        playerBody.rotation = Quaternion.Euler(0f, mainCamera.transform.eulerAngles.y, 0f);
    }
   

    private void HandleJump()
    {
        if (jumpAction.action.WasPerformedThisFrame() && isGrounded)
        {
            velocity.y = Mathf.Sqrt(jumpHeight * -2f * gravity);
        }
    }


    private void HandleGravity()
    {
        velocity.y += gravity * Time.deltaTime;

    }


    private void HandleGroundCheck()
    {
        RaycastHit hit;
        isGrounded = Physics.SphereCast(transform.position, groundCheckRadius, Vector3.down, out hit, groundCheckDistance, groundLayer);

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




    private void OnDrawGizmos()
    {
        if (!Application.isPlaying) return;

        Gizmos.color = Color.blue;
        Vector3 origin = transform.position;
        Vector3 direction = Vector3.down;

        Gizmos.DrawWireSphere(origin + direction * groundCheckDistance, groundCheckRadius);
    }





    private void OnEnable()
    {
        moveAction.action.Enable();
        sprintAction.action.Enable();
        jumpAction.action.Enable();
    }

}