using UnityEngine;
using UnityEngine.UI;
using Cysharp.Threading.Tasks;
using System;
using MotionFramework;
using MotionFramework.Scripts.Runtime.Engine.Engine.Network.WebRequest;

namespace Framework.Tools
{
    /// <summary>
    /// 工具组件
    ///
    /// 功能：
    ///     黑屏过渡->BlackScreenTransition
    /// </summary>
    public class ToolsComponent : MonoBehaviour
    {

       // 单例实例
        private static ToolsComponent _instance;
        public static ToolsComponent Instance
        {
            get
            {
                if (_instance == null)
                {
                    _instance = FindObjectOfType<ToolsComponent>();
                    if (_instance == null)
                    {
                        Debug.LogError("未找到挂载 ToolsComponent 脚本的对象，请检查场景！");
                    }
                    else
                    {
                        DontDestroyOnLoad(_instance.gameObject);
                    }
                }
                return _instance;
            }
        }


        [SerializeField] private RawImage _image;

        private  void Start()
        {
            //BlackScreenTransition();
        }

        /// <summary>
        /// 黑屏过渡
        /// </summary>
        public async void BlackScreenTransition()
        {
            // 从 0 渐变到 1
            await FadeImageAlpha(0f, 1f, 1f);

            await UniTask.Delay(1000);
            
            // 从 1 渐变到 0
            await FadeImageAlpha(1f, 0f, 1f);
        }


        private async UniTask FadeImageAlpha(float startAlpha, float endAlpha, float duration)
        {
            float elapsedTime = 0f;
            Color currentColor = _image.color;

            while (elapsedTime < duration)
            {
                // 根据时间计算当前透明度
                float alpha = Mathf.Lerp(startAlpha, endAlpha, elapsedTime / duration);
                currentColor.a = alpha;
                _image.color = currentColor;
                _image.color = currentColor;

                elapsedTime += Time.deltaTime;
                await UniTask.Yield();
            }

            // 确保最终透明度正确
            currentColor.a = endAlpha;
            _image.color = currentColor;
        }

  
    }
}