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

namespace TcgEngine.UI
{
    /// <summary>
    /// 启动
    /// </summary>
    public class SplashScreenManager : MonoBehaviour
    {
        [Header("UI组件")]
        public Text statusText;
        public Slider progressBar;
        public Text progressText;
        public Image logoImage;
        public CanvasGroup mainCanvasGroup;

        [Header("设置")]
        public string nextSceneName = "LoginMenu";
        public float fadeInDuration = 1f;
        public float fadeOutDuration = 1f;
        public float minimumDisplayTime = 3f;

        [Header("音效")]
        public AudioClip splashMusic;

        private float startTime;

        private void Start()
        {
            startTime = Time.time;
            InitializeUI();
            StartCoroutine(RunSplashSequence());
        }

        private void InitializeUI()
        {
            // 设置初始状态
            if (mainCanvasGroup != null)
                mainCanvasGroup.alpha = 0f;

            UpdateStatus("启动中...");
            UpdateProgress(0f);

            // 播放音乐
            if (splashMusic != null)
            {
                AudioTool.Get().PlayMusic("splash", splashMusic, 0.6f);
            }
        }

        private IEnumerator RunSplashSequence()
        {
            // 淡入
            yield return StartCoroutine(FadeIn());

            // 获取版本信息
            string version = GetCurrentVersion();
            // 显示版本信息
            UpdateStatus($"版本 {version}");
            UpdateProgress(0.1f);
            yield return new WaitForSeconds(0.5f);

            // 开始资源初始化
            yield return StartCoroutine(InitializeResources());

            // 确保最少显示时间
            yield return StartCoroutine(WaitForMinimumTime());

            // 完成并跳转
            yield return StartCoroutine(CompleteAndTransition());
        }

        private IEnumerator FadeIn()
        {
            if (mainCanvasGroup == null) yield break;

            float elapsed = 0f;
            while (elapsed < fadeInDuration)
            {
                elapsed += Time.deltaTime;
                mainCanvasGroup.alpha = Mathf.Lerp(0f, 1f, elapsed / fadeInDuration);
                yield return null;
            }
            mainCanvasGroup.alpha = 1f;
        }

        private IEnumerator InitializeResources()
        {
            UpdateStatus("正在初始化资源系统...");
            UpdateProgress(0.2f);
            yield return new WaitForSeconds(0.3f);

            // 直接在主线程中调用ResourceDownloader
            ResourceDownloader downloader = null;

            try
            {
                downloader = ResourceDownloader.Get();

                // 订阅事件以获取进度更新
                downloader.OnDownloadProgress += OnDownloadProgress;
                downloader.OnExtractProgress += OnExtractProgress;
                downloader.OnDownloadComplete += OnDownloadComplete;
                downloader.OnExtractComplete += OnExtractComplete;
                downloader.OnDownloadError += OnDownloadError;

                UpdateStatus("正在检查资源版本...");
                UpdateProgress(0.3f);
            }
            catch (System.Exception e)
            {
                Debug.LogError($"[SplashScreenManager] 资源初始化异常: {e.Message}");
                UpdateStatus("资源初始化失败，使用现有资源");
                UpdateProgress(0.9f);
                yield break;
            }

            // 使用协程包装异步调用
            yield return StartCoroutine(CheckAndDownloadResources(downloader));

            // 取消订阅事件
            if (downloader != null)
            {
                downloader.OnDownloadProgress -= OnDownloadProgress;
                downloader.OnExtractProgress -= OnExtractProgress;
                downloader.OnDownloadComplete -= OnDownloadComplete;
                downloader.OnExtractComplete -= OnExtractComplete;
                downloader.OnDownloadError -= OnDownloadError;
            }

            UpdateStatus("初始化完成！");
            UpdateProgress(1f);
        }

        private IEnumerator CheckAndDownloadResources(ResourceDownloader downloader)
        {
            bool needsUpdate = false;
            bool taskCompleted = false;

            // 异步检查更新
            downloader.CheckForUpdates().ContinueWith(task =>
            {
                needsUpdate = task.Result;
                taskCompleted = true;
            });

            // 等待任务完成
            while (!taskCompleted)
            {
                yield return null;
            }

            if (!needsUpdate)
            {
                UpdateStatus("资源已是最新版本");
                UpdateProgress(0.9f);
                yield return new WaitForSeconds(0.5f);
                yield break;
            }

            UpdateStatus("发现新版本，开始下载...");
            UpdateProgress(0.4f);

            // 异步下载资源
            bool downloadSuccess = false;
            taskCompleted = false;

            downloader.DownloadAndUpdateResources().ContinueWith(task =>
            {
                downloadSuccess = task.Result;
                taskCompleted = true;
            });

            // 等待下载完成
            while (!taskCompleted)
            {
                yield return null;
            }

            if (downloadSuccess)
            {
                UpdateStatus("资源更新完成！");
            }
            else
            {
                UpdateStatus("下载失败，使用现有资源");
            }

            UpdateProgress(0.95f);
        }

        private void OnDownloadProgress(float progress)
        {
            float baseProgress = 0.4f;
            float range = 0.3f;
            UpdateProgress(baseProgress + progress * range);
            UpdateStatus($"正在下载资源 {(progress * 100):F0}%");
        }

        private void OnDownloadComplete(string filePath)
        {
            UpdateStatus("下载完成，正在解压...");
            UpdateProgress(0.7f);
        }

        private void OnDownloadError(string error)
        {
            UpdateStatus("下载出错，使用现有资源");
            Debug.LogWarning($"[SplashScreenManager] 下载错误: {error}");
        }

        private void OnExtractProgress(float progress)
        {
            float baseProgress = 0.7f;
            float range = 0.2f;
            UpdateProgress(baseProgress + progress * range);
            UpdateStatus($"正在解压资源 {(progress * 100):F0}%");
        }

        private void OnExtractComplete()
        {
            UpdateStatus("解压完成！");
            UpdateProgress(0.9f);
        }

        private IEnumerator WaitForMinimumTime()
        {
            float elapsedTime = Time.time - startTime;
            float remainingTime = minimumDisplayTime - elapsedTime;

            if (remainingTime > 0)
            {
                UpdateStatus("准备完成...");
                yield return new WaitForSeconds(remainingTime);
            }
        }

        private IEnumerator CompleteAndTransition()
        {
            UpdateStatus("准备进入游戏...");

            // 淡出音乐
            if (splashMusic != null)
            {
                AudioTool.Get().FadeOutMusic("splash");
            }

            // 淡出界面
            if (mainCanvasGroup != null)
            {
                float elapsed = 0f;
                while (elapsed < fadeOutDuration)
                {
                    elapsed += Time.deltaTime;
                    mainCanvasGroup.alpha = Mathf.Lerp(1f, 0f, elapsed / fadeOutDuration);
                    yield return null;
                }
            }

            // 显示黑屏并跳转
            var blackPanel = TcgEngine.UI.BlackPanel.Get();
            if (blackPanel != null)
            {
                blackPanel.Show();
                yield return new WaitForSeconds(0.3f);
            }
            else
            {
                Debug.LogWarning("[SplashScreenManager] BlackPanel not found, skipping fade effect");
                yield return new WaitForSeconds(0.1f);
            }

            // 跳转到下一个场景
            SceneManager.LoadScene(nextSceneName);
        }

        private void UpdateStatus(string message)
        {
            if (statusText != null)
                statusText.text = message;
            Debug.Log($"[SplashScreen] {message}");
        }

        private void UpdateProgress(float progress)
        {
            progress = Mathf.Clamp01(progress);

            if (progressBar != null)
                progressBar.value = progress;

            if (progressText != null)
                progressText.text = $"{(progress * 100):F0}%";
        }

        /// <summary>
        /// 获取当前版本信息
        /// </summary>
        private string GetCurrentVersion()
        {
            try
            {
                string versionFile = System.IO.Path.Combine(Application.persistentDataPath, "version.txt");
                if (System.IO.File.Exists(versionFile))
                {
                    string[] lines = System.IO.File.ReadAllLines(versionFile);
                    if (lines.Length > 0 && !string.IsNullOrEmpty(lines[0].Trim()))
                    {
                        return lines[0].Trim();
                    }
                }

                var downloader = ResourceDownloader.Get();
                if (downloader != null)
                {
                    string resourceVersion = downloader.GetCurrentVersion();
                    if (!string.IsNullOrEmpty(resourceVersion) && resourceVersion != "0.0.0")
                    {
                        return resourceVersion;
                    }
                }

                return Application.version;
            }
            catch (System.Exception e)
            {
                Debug.LogWarning($"[SplashScreenManager] 获取版本信息失败: {e.Message}");
                return Application.version;
            }
        }
    }
}