using AlibabaCloud.SDK.Vod20170321;
using AlibabaCloud.SDK.Vod20170321.Models;
using Aliyun.OSS;
using Microsoft.Extensions.DependencyInjection;
using SqlSugar.IOC;
using System;
using System.IO;
using System.Text;
using System.Threading.Tasks;
using VideoAnalysisCore.Model;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System.Collections.Generic;
using System.Security.Cryptography;
using Yitter.IdGenerator;

namespace VideoAnalysisCore.Common.Expand
{
    public static class TidySlideExpand
    {
        public static void AddTidySlideExpand(this IServiceCollection services)
        {
            services.AddSingleton<TidySlideHandle>();
            services.AddTransient<Repository<TidySlideTaskResult>>();
        }
    }

    public class TidySlideHandle
    {
        private readonly Client _vodClient;
        private readonly Repository<VideoTask> _videoTaskDB;
        private readonly Repository<TidySlideTaskResult> _tidySlideTaskResultDB;
        private readonly RedisManager _redisManager;
        private readonly OssClient _ossClient; // 使用系统统一注入的 OSS Client
        private readonly TidySlideWorkflowManager _workflowManager; // 注入工作流管理器

        public TidySlideHandle(Client vodClient, Repository<VideoTask> videoTaskDB, Repository<TidySlideTaskResult> tidySlideTaskResultDB, RedisManager redisManager, OssClient ossClient, TidySlideWorkflowManager workflowManager)
        {
            _vodClient = vodClient;
            _videoTaskDB = videoTaskDB;
            _tidySlideTaskResultDB = tidySlideTaskResultDB;
            _redisManager = redisManager;
            _ossClient = ossClient;
            _workflowManager = workflowManager;
        }

        public async Task RunAsync(string task)
        {
            var taskId = long.Parse(task);
            var localPath = task.LocalPath();
            var m3u8Path = Path.Combine(localPath, "out.m3u8");

            if (!File.Exists(m3u8Path))
            {
                await _workflowManager.AddTaskLog(task, "未找到 m3u8 文件，无法进行切片上传");
                throw new FileNotFoundException("M3U8文件未找到", m3u8Path);
            }

            // 获取所有切片文件 (out*.ts)
            var tsFiles = Directory.GetFiles(localPath, "out*.ts");
            if (tsFiles.Length == 0)
            {
                await _workflowManager.AddTaskLog(task, "未找到 ts 切片文件");
                throw new FileNotFoundException("TS切片文件未找到");
            }

            var title = $"Task_{taskId}_{DateTime.Now:yyyyMMddHHmmss}";

            await _workflowManager.AddTaskLog(task, "正在获取VOD上传凭证...");

            // 1. 获取上传凭证和地址
            // 注意：VOD上传m3u8时，FileName必须以 .m3u8 结尾
            var request = new CreateUploadVideoRequest
            {
                Title = title,
                FileName = "out.m3u8", // 必须是 m3u8 文件名
                Description = "视频分析_PPT清洗 ",
                Tags = "PPT清洗", // 可选：设置标签
                CateId = 1000709090,
            };

            var response = await _vodClient.CreateUploadVideoAsync(request);
            if (response.Body == null || string.IsNullOrEmpty(response.Body.UploadAddress) || string.IsNullOrEmpty(response.Body.UploadAuth))
            {
                throw new Exception($"获取上传凭证失败: RequestId={response.Body?.RequestId}");
            }

            var videoId = response.Body.VideoId;
            var uploadAddressStr = response.Body.UploadAddress;
            var uploadAuthStr = response.Body.UploadAuth;

            await _workflowManager.AddTaskLog(task, $"获取凭证成功，VideoId: {videoId}");

            // 2. 解析凭证 (Base64 -> JSON)
            var addressJson = JObject.Parse(Encoding.UTF8.GetString(Convert.FromBase64String(uploadAddressStr)));
            var authJson = JObject.Parse(Encoding.UTF8.GetString(Convert.FromBase64String(uploadAuthStr)));

            var endpoint = addressJson["Endpoint"]?.ToString();
            var bucket = addressJson["Bucket"]?.ToString();
            // 这是 VOD 分配的 m3u8 存储路径，例如 "sv/243d.../out.m3u8"
            var objectName = addressJson["FileName"]?.ToString();
            var accessKeyId = authJson["AccessKeyId"]?.ToString();
            var accessKeySecret = authJson["AccessKeySecret"]?.ToString();
            var securityToken = authJson["SecurityToken"]?.ToString();

            if (string.IsNullOrEmpty(endpoint) || string.IsNullOrEmpty(bucket) || string.IsNullOrEmpty(objectName))
                throw new Exception("解析上传地址失败");

            // 修正 Endpoint 格式 (如果缺少协议头)
            if (!endpoint.StartsWith("http"))
                endpoint = "https://" + endpoint;

            // 3. 构造 OSS 客户端 (使用临时凭证)
            var ossClient = new OssClient(endpoint, accessKeyId, accessKeySecret, securityToken);

            // 4. 确定 OSS 目录前缀
            // VOD 返回的 objectName 是完整的文件路径，我们需要提取目录部分来存放 .ts 文件
            // 例如: objectName = "sv/5903240e-19544975a64/out.m3u8"
            // 则 prefix = "sv/5903240e-19544975a64/"
            var ossPrefix = objectName.Substring(0, objectName.LastIndexOf('/') + 1);

            await _workflowManager.AddTaskLog(task, $"开始上传文件到 VOD OSS (Bucket: {bucket}, Prefix: {ossPrefix})...");

            try
            {
                // A. 上传所有 TS 切片
                await _workflowManager.AddTaskLog(task, $"开始上传 TS 切片 (共 {tsFiles.Length} 个)...");
                for (int i = 0; i < tsFiles.Length; i++)
                {
                    var tsFile = tsFiles[i];
                    var fileName = Path.GetFileName(tsFile);
                    var tsObjectKey = ossPrefix + fileName;
                    
                    var tsRetryCount = 0;
                    var tsMaxRetries = 10;
                    while (true)
                    {
                        try
                        {
                            using var fs = File.OpenRead(tsFile);
                            ossClient.PutObject(bucket, tsObjectKey, fs);
                            break; // Upload successful, break retry loop
                        }
                        catch (Exception ex)
                        {
                            tsRetryCount++;
                            if (tsRetryCount >= tsMaxRetries)
                            {
                                await _workflowManager.AddTaskLog(task, $"上传 TS 切片 {fileName} 失败，已重试 {tsMaxRetries} 次: {ex.Message}");
                                throw; // Re-throw exception to stop the process
                            }
                            else
                            {
                                await _workflowManager.AddTaskLog(task, $"上传 TS 切片 {fileName} 失败 (第 {tsRetryCount} 次重试): {ex.Message}，1秒后重试...");
                                await Task.Delay(1000);
                            }
                        }
                    }
                    
                    // 更新上传进度
                    if (i % 5 == 0) // 每5个文件更新一次进度
                    {
                        var progress = Math.Round((double)i / tsFiles.Length * 100, 1);
                        _workflowManager.SetTaskProgress(taskId, $"Upload->{progress}%");
                    }
                }

                // B. 上传 m3u8 索引文件
                // 必须使用 VOD 指定的 objectName
                await _workflowManager.AddTaskLog(task, "开始上传 m3u8 索引文件...");
                
                var m3u8RetryCount = 0;
                var m3u8MaxRetries = 3;
                while (true)
                {
                    try
                    {
                        using (var fs = File.OpenRead(m3u8Path))
                        {
                            ossClient.PutObject(bucket, objectName, fs);
                        }
                        break; // Upload successful
                    }
                    catch (Exception ex)
                    {
                        m3u8RetryCount++;
                        if (m3u8RetryCount >= m3u8MaxRetries)
                        {
                            await _workflowManager.AddTaskLog(task, $"上传 m3u8 文件失败，已重试 {m3u8MaxRetries} 次: {ex.Message}");
                            throw;
                        }
                        else
                        {
                            await _workflowManager.AddTaskLog(task, $"上传 m3u8 文件失败 (第 {m3u8RetryCount} 次重试): {ex.Message}，1秒后重试...");
                            await Task.Delay(1000);
                        }
                    }
                }

                await _workflowManager.AddTaskLog(task, "上传成功");

                // 5. 更新数据库
                // 对于 VOD 托管视频，我们主要存储 VideoId (TagId)，播放地址通常由前端调用 VOD 接口获取
                // 或者我们可以尝试获取播放地址存入 MediaUrl


                await _tidySlideTaskResultDB.InsertAsync(new TidySlideTaskResult()
                {
                    Id = YitIdHelper.NextId(),
                    VideoTaskId = long.Parse(task),
                    VideoId = videoId,
                });
            }
            catch (Exception ex)
            {
                await _workflowManager.AddTaskLog(task, $"上传 VOD OSS 异常: {ex.Message}");
                
                // 如果已获取 VideoId 但上传失败，则删除 VOD 记录
                if (!string.IsNullOrEmpty(videoId))
                {
                    try
                    {
                        await _workflowManager.AddTaskLog(task, $"正在回滚删除 VOD 视频记录 (VideoId: {videoId})...");
                        var deleteRequest = new DeleteVideoRequest { VideoIds = videoId };
                        await _vodClient.DeleteVideoAsync(deleteRequest);
                        await _workflowManager.AddTaskLog(task, "VOD 视频记录删除成功");
                    }
                    catch (Exception deleteEx)
                    {
                        await _workflowManager.AddTaskLog(task, $"回滚删除 VOD 视频记录失败: {deleteEx.Message}");
                    }
                }
                
                throw;
            }
        }
    }
}