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

/// <summary>
/// 启动加载窗口
/// </summary>
public class LaunchLoadingWin : MonoBehaviour
{
    // 单例实例
    private static LaunchLoadingWin _instance;

    public static LaunchLoadingWin Instance
    {
        get
        {
            if (_instance == null)
            {
                Debug.Log("LaunchLoadingWin 界面未打开");
                return null;
            }

            return _instance;
        }
    }
    
    // UI组件引用
    [SerializeField] public Text titleText;
    [SerializeField] public Text tipsText;
    [SerializeField] public Image progressBar;
    [SerializeField] public Text progressText;
    
    // 提示文本列表
    [SerializeField] private List<string> tipsList = new List<string>();
    
    // 当前提示索引
    private int currentTipIndex = 0;
    
    // 是否正在显示
    
    // 计时器
    private float tipChangeTimer = 0f;
    private const float TIP_CHANGE_INTERVAL = 3f; // 提示切换间隔时间
    
    private void Awake()
    {
        _instance = this;
        
        // 初始化提示列表
        InitTipsList();
        
        // 初始化进度条
        SetProgress(0f);
    }
    
    /// <summary>
    /// 初始化提示列表
    /// </summary>
    private void InitTipsList()
    {
        tipsList.Clear();
        tipsList.Add(FirstPackLang.Instance.GetText(FirstPackLang.TextIndex.LoadingResources));
        tipsList.Add(FirstPackLang.Instance.GetText(FirstPackLang.TextIndex.CheckingVersionUpdate));
        tipsList.Add(FirstPackLang.Instance.GetText(FirstPackLang.TextIndex.InitializingGame));
        tipsList.Add(FirstPackLang.Instance.GetText(FirstPackLang.TextIndex.EnteringGameWorld));
    }
    
    
    /// <summary>
    /// 打开窗口
    /// </summary>
    public static void OpenWindow()
    {
        if (null != _instance)
        {
            DestroyImmediate(_instance.gameObject);
            _instance = null;
        }

        _instance = GameObject.Instantiate(Resources.Load<GameObject>("LaunchLoadingWin")).GetComponent<LaunchLoadingWin>();
        _instance.gameObject.SetActive(true);
    }
    
    /// <summary>
    /// 关闭窗口
    /// </summary>
    public void CloseWindow()
    {
        // 隐藏窗口而不是销毁
        DestroyImmediate(gameObject);
        _instance = null;
        
        Debug.Log("关闭加载窗口");
    }
    
    /// <summary>
    /// 设置进度
    /// </summary>
    /// <param name="progress">进度值(0-1)</param>
    public void SetProgress(float progress)
    {
        // 限制进度值范围
        progress = Mathf.Clamp01(progress);
        
        // 更新进度条
        if (progressBar != null)
        {
            progressBar.fillAmount = progress;
        }
        
        // 更新进度文本
        if (progressText != null)
        {
            progressText.text = $"{(int)(progress * 100)}%";
        }
    }
    
    /// <summary>
    /// 设置提示文本
    /// </summary>
    /// <param name="tip">提示文本</param>
    public void SetTip(string tip)
    {
        if (tipsText != null)
        {
            tipsText.text = tip;
        }
    }
    
    
    /// <summary>
    /// 异步显示加载进度
    /// </summary>
    /// <param name="duration">加载持续时间</param>
    /// <param name="targetProgress">目标进度</param>
    public async UniTask ShowProgressAsync(float duration, float targetProgress = 1.0f)
    {
        float startProgress = progressBar != null ? progressBar.fillAmount : 0f;
        float currentProgress = startProgress;
        float elapsedTime = 0f;
        
        while (elapsedTime < duration)
        {
            elapsedTime += Time.deltaTime;
            currentProgress = Mathf.Lerp(startProgress, targetProgress, elapsedTime / duration);
            SetProgress(currentProgress);
            await UniTask.Yield();
        }
        
        // 确保最终进度正确
        SetProgress(targetProgress);
    }

    /// <summary>
    /// 当前状态索引
    /// </summary>
    private int currentStateIndex = -1;
    
    /// <summary>
    /// 设置当前状态
    /// </summary>
    /// <param name="stateIndex">状态索引</param>
    public void SetCurrentState(int stateIndex)
    {
        currentStateIndex = stateIndex;
        
        // 根据状态索引更新提示文本
        UpdateTipsByState();
    }

    /// <summary>
    /// 根据当前状态更新提示文本
    /// </summary>
    private void UpdateTipsByState()
    {
        string tip = "";
        
        // 根据状态索引设置对应的提示文本
        switch (currentStateIndex)
        {
            case FirstPackLang.TextIndex.InitSDK:
                tip = FirstPackLang.Instance.GetText(FirstPackLang.TextIndex.InitializingSDK);
                break;
            case FirstPackLang.TextIndex.ExtractResources:
                tip = FirstPackLang.Instance.GetText(FirstPackLang.TextIndex.CheckingResources);
                break;
            case FirstPackLang.TextIndex.CheckVersion:
                tip = FirstPackLang.Instance.GetText(FirstPackLang.TextIndex.CheckingVersion);
                break;
            case FirstPackLang.TextIndex.HotUpdate:
                tip = FirstPackLang.Instance.GetText(FirstPackLang.TextIndex.PrepareUpdate);
                break;
            case FirstPackLang.TextIndex.EnterHotUpdateAssembly:
                tip = FirstPackLang.Instance.GetText(FirstPackLang.TextIndex.EnteringGame);
                break;
        }
        
        // 设置提示文本
        if (!string.IsNullOrEmpty(tip))
        {
            SetTip(tip);
        }
    }
}