using UnityEngine;
using UnityEngine.InputSystem;

[RequireComponent(typeof(Rigidbody2D))]
[RequireComponent(typeof(BoxCollider2D))]
public class PlayerPlatformerController : MonoBehaviour
{
    [SerializeField] private InputActionAsset inputActions;
    [SerializeField] private string actionMapName = "Player";
    [SerializeField] private string moveActionName = "Move";
    [SerializeField] private string jumpActionName = "Jump";
    [SerializeField] private float moveSpeed = 6f;
    [SerializeField] private float jumpImpulse = 8f;
    [SerializeField] private LayerMask groundMask = ~0;
    [SerializeField] private float groundCheckDistance = 0.05f;

    private Rigidbody2D body;
    private BoxCollider2D bodyCollider;
    private InputAction moveAction;
    private InputAction jumpAction;

    private void Awake()
    {
        body = GetComponent<Rigidbody2D>();
        bodyCollider = GetComponent<BoxCollider2D>();
    }

    private void OnEnable()
    {
        if (inputActions == null)
        {
            Debug.LogError("PlayerPlatformerController missing InputActionAsset reference.", this);
            return;
        }

        var map = inputActions.FindActionMap(actionMapName, true);
        moveAction = map.FindAction(moveActionName, true);
        jumpAction = map.FindAction(jumpActionName, true);

        moveAction.Enable();
        jumpAction.Enable();
        jumpAction.performed += OnJumpPerformed;
    }

    private void OnDisable()
    {
        if (jumpAction != null)
        {
            jumpAction.performed -= OnJumpPerformed;
            jumpAction.Disable();
        }

        if (moveAction != null)
        {
            moveAction.Disable();
        }
    }

    private void FixedUpdate()
    {
        if (moveAction == null)
        {
            return;
        }

        var input = moveAction.ReadValue<Vector2>();
        var velocity = body.linearVelocity;
        velocity.x = input.x * moveSpeed;
        body.linearVelocity = velocity;
    }

    private void OnJumpPerformed(InputAction.CallbackContext context)
    {
        if (!IsGrounded())
        {
            return;
        }

        var velocity = body.linearVelocity;
        velocity.y = 0f;
        body.linearVelocity = velocity;
        body.AddForce(Vector2.up * jumpImpulse, ForceMode2D.Impulse);
    }

    private bool IsGrounded()
    {
        var bounds = bodyCollider.bounds;
        var checkSize = new Vector2(bounds.size.x * 0.9f, groundCheckDistance * 2f);
        var checkCenter = new Vector2(bounds.center.x, bounds.min.y - groundCheckDistance);
        var hits = Physics2D.OverlapBoxAll(checkCenter, checkSize, 0f, groundMask);
        for (var i = 0; i < hits.Length; i++)
        {
            var hit = hits[i];
            if (hit != null && hit != bodyCollider)
            {
                return true;
            }
        }

        return false;
    }
}