using UnityEngine;
using UnityEngine.SceneManagement;
using UnityEngine.UI;
using System.Collections;

public class Transition : MonoBehaviour
{
    public static Transition instance;

    [Header("Komponen")]
    public CanvasGroup blackScreen; // Tarik object BlackScreen ke sini

    void Awake()
    {
        // Singleton (Anti Hancur)
        if (instance == null)
        {
            instance = this;
            DontDestroyOnLoad(gameObject);
        }
        else
        {
            Destroy(gameObject);
        }
    }

    // === TIPE 1: FADE BLACK (Layar Gelap Total) ===
    public void LoadSceneBlack(string sceneName)
    {
        StartCoroutine(ProcessFadeBlack(sceneName));
    }

    IEnumerator ProcessFadeBlack(string sceneName)
    {
        blackScreen.blocksRaycasts = true; // Blokir klik user

        // 1. Gelapkan Layar (Alpha 0 -> 1)
        float timer = 0;
        while (timer < 0.5f)
        {
            timer += Time.deltaTime;
            blackScreen.alpha = timer / 0.5f;
            yield return null;
        }
        blackScreen.alpha = 1;

        // 2. Pindah Scene
        SceneManager.LoadScene(sceneName);
        
        // Tunggu dikit biar scene baru loading sempurna
        yield return new WaitForSeconds(0.2f);

        // 3. Terangkan Layar (Alpha 1 -> 0)
        timer = 0;
        while (timer < 0.5f)
        {
            timer += Time.deltaTime;
            blackScreen.alpha = 1 - (timer / 0.5f);
            yield return null;
        }
        blackScreen.alpha = 0;
        blackScreen.blocksRaycasts = false; // Buka blokir
    }
}