using UnityEngine;
using System.Collections;

public class CanvasController : MonoBehaviour
{
    private CanvasGroup canvasGroup; // CanvasGroup do kontrolowania alfa Canvasu
    public float displayDistance = 5f; // Odległość, od której Canvas zaczyna się pojawiać
    public float fadeSpeed = 2f; // Prędkość wyświetlania i zanikania Canvasu

    private Transform player; // Referencja do transformacji gracza
    private bool isPlayerClose = false;

    void Start()
    {
        // Znajdź obiekt gracza z tagiem "Player"
        GameObject playerObject = GameObject.FindGameObjectWithTag("Player");
        if (playerObject != null)
        {
            player = playerObject.transform;
        }
        else
        {
            Debug.LogError("Player object not found! Make sure the player has the 'Player' tag.");
        }

        // Znajdź CanvasGroup na tym samym obiekcie
        canvasGroup = GetComponent<CanvasGroup>();
        if (canvasGroup == null)
        {
            Debug.LogError("CanvasGroup component not found! Make sure the Canvas has a CanvasGroup component.");
        }
    }

    void Update()
    {
        if (player == null || canvasGroup == null)
            return;

        float distance = Vector3.Distance(transform.position, player.position);

        // Sprawdzanie, czy gracz jest wystarczająco blisko
        if (distance <= displayDistance && !isPlayerClose)
        {
            isPlayerClose = true;
            StopAllCoroutines();
            StartCoroutine(FadeCanvas(1f)); // Pokaż Canvas
        }
        else if (distance > displayDistance && isPlayerClose)
        {
            isPlayerClose = false;
            StopAllCoroutines();
            StartCoroutine(FadeCanvas(0f)); // Ukryj Canvas
        }
    }

    private IEnumerator FadeCanvas(float targetAlpha)
    {
        while (!Mathf.Approximately(canvasGroup.alpha, targetAlpha))
        {
            canvasGroup.alpha = Mathf.MoveTowards(canvasGroup.alpha, targetAlpha, fadeSpeed * Time.deltaTime);
            yield return null;
        }
    }
}