using System;
using System.Collections;
using System.Collections.Generic;
using System.Threading.Tasks;
using Cysharp.Threading.Tasks;
using UnityEngine;
using UnityEngine.SceneManagement;
using UnityEngine.UI;

public class SplashScreen : MonoBehaviour
{
    private Image image;

    async void Start()
    {
        image = GetComponentInChildren<Image>();
        // 初始完全透明
        image.color = new Color(1, 1, 1, 0);

        // 渐显效果（2秒）
        await Fade(0, 1, 0.5f);

        // 保持显示（原2秒等待）
        await UniTask.Delay(TimeSpan.FromSeconds(1));

        // 渐隐效果（1秒）
        await Fade(1, 0, 0.5f);
        
        await SceneManager.LoadSceneAsync(1);
        if (transform != null)
            Destroy(gameObject);
    }


    private async UniTask Fade(float startAlpha, float endAlpha, float duration)
    {
        float elapsed = 0f;
        while (elapsed < duration)
        {
            float alpha = Mathf.Lerp(startAlpha, endAlpha, elapsed / duration);
            image.color = new Color(1, 1, 1, alpha);
            elapsed += Time.deltaTime;
            await UniTask.Yield();
        }

        image.color = new Color(1, 1, 1, endAlpha);
    }
}