using FreeRedis;
using Microsoft.Extensions.DependencyInjection;
using SqlSugar.IOC;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using VideoAnalysisCore.AICore.FFMPGE;
using VideoAnalysisCore.AICore.GPT;
using VideoAnalysisCore.AICore.SherpaOnnx;
using VideoAnalysisCore.AICore.Whisper;
using VideoAnalysisCore.Common.Expand;
using VideoAnalysisCore.Model;
using VideoAnalysisCore.Model.Enum;

namespace VideoAnalysisCore.Common
{
    /// <summary>
    /// AI视频切片工作流
    /// </summary>
    public static class VideoSliceWorkflowExpand
    {
        public static void AddVideoSliceWorkflow(this IServiceCollection services)
        {
            if (AppCommon.Config.Workflow.Default.Enabled)
            {
                Console.WriteLine($"{DateTime.Now}=>初始化 AI切片工作流");
                services.AddSingleton<VideoSliceWorkflowManager>();
                services.AddSingleton<VideoSliceWorkflowInit>();
            }
        }
    }

    public class VideoSliceWorkflowInit
    {
        private readonly VideoSliceWorkflowManager _manager;
        private readonly IServiceProvider _serviceProvider;
        private readonly FFMPGEHandle _ffmpeg;
        private readonly SenseVoice _senseVoice;

        public VideoSliceWorkflowInit(VideoSliceWorkflowManager manager, IServiceProvider serviceProvider, FFMPGEHandle ffmpeg, SenseVoice senseVoice)
        {
            _manager = manager;
            _serviceProvider = serviceProvider;
            _ffmpeg = ffmpeg;
            _senseVoice = senseVoice;
            Init();
            _manager.InitChannel();
        }

        public void Init()
        {
            var SubscribeList = _manager.SubscribeList;
            SubscribeList.Add(RedisChannelEnum.排队中, async (task) => await Task.CompletedTask);
            SubscribeList.Add(RedisChannelEnum.下载文件, async (task) =>
            {
                using var scope = _serviceProvider.CreateScope();
                var downloadService = scope.ServiceProvider.GetService<DownloadFile>();
                if (downloadService is null) throw new Exception("DownloadFile 未注入");
                await downloadService.RunTask(task, "VideoSliceWorkflow");
            });
            SubscribeList.Add(RedisChannelEnum.分离音频, _ffmpeg.RunAsync);
            SubscribeList.Add(RedisChannelEnum.解析字幕, _senseVoice.RunTask);

            SubscribeList.Add(RedisChannelEnum.AI课程类型, async (task) =>
            {
                using var scope = _serviceProvider.CreateScope();
                var service = scope.ServiceProvider.GetService<IBaseGPTWorkflow>();
                if (service is null) throw new Exception("IBserGPT 未注入");
                await service.GetVideoType(task);
            });
            SubscribeList.Add(RedisChannelEnum.AI模型分析, async (task) =>
            {
                using var scope = _serviceProvider.CreateScope();
                var service = scope.ServiceProvider.GetService<IBaseGPTWorkflow>();
                if (service is null) throw new Exception("IBserGPT 未注入");
                await service.GetKnow(task);
            });
            SubscribeList.Add(RedisChannelEnum.AI分析试题, async (task) =>
            {
                using var scope = _serviceProvider.CreateScope();
                var service = scope.ServiceProvider.GetService<IBaseGPTWorkflow>();
                if (service is null) throw new Exception("IBserGPT 未注入");
                await service.GetVideoQuestion(task);
            });
            SubscribeList.Add(RedisChannelEnum.结束任务, _manager.TaskEnd);
        }
    }

    public class VideoSliceWorkflowManager : WorkflowBase<RedisChannelEnum>
    {
        public VideoSliceWorkflowManager(RedisClient redis, RedisManager redisManager) : base(redis, redisManager)
        {
        }

        protected override string ChannelKey => RedisExpandKey.ChannelKey;
        protected override int Concurrency => AppCommon.Config.Workflow.Default.Concurrency;
        protected override string WorkflowName => "VideoSliceWorkflow"; // 显式指定，避免重构改名风险

        /// <summary>
        /// 重写状态更新逻辑：保持兼容性，继续更新 VideoTask.LastEnum
        /// </summary>
        protected override async Task UpdateTaskStateAsync(string taskId, RedisChannelEnum step)
        {
            var tID = long.Parse(taskId);
            // 1. 调用基类方法，更新 VideoTaskWorkflow 表 (可选，如果想双写)
            await base.UpdateTaskStateAsync(taskId, step);

            // 2. 更新旧的 VideoTask 表，保持前端兼容
            using var scope = AppCommon.Services.CreateScope();
            var vDB = scope.ServiceProvider.GetService<Repository<VideoTask>>();
            if (vDB != null)
            {
                await vDB.CopyNew().AsUpdateable()
                    .SetColumns(it => it.LastEnum == step)
                    .Where(it => it.Id == tID)
                    .ExecuteCommandAsync();
            }
        }

        protected override async Task HandleSpecialFlowAsync(RedisChannelEnum currentStep, RedisChannelEnum nextStep, string taskId)
        {
            // 4. 特殊分流：解析字幕完成后，后续步骤转后台并行处理
            if (currentStep == RedisChannelEnum.解析字幕)
            {
                await DispatchBackgroundFlow(nextStep, taskId, taskId);
                throw new WorkflowFlowSwitchException(); // 抛出异常以中断当前流程（基类捕获）
            }
            await Task.CompletedTask;
        }

        public override async Task TaskEnd(string task)
        {
            var tId = long.Parse(task);
            await base.TaskEnd(task);

            // 原 RedisManager.TaskEnd 逻辑迁移至此
            using var scope = AppCommon.Services.CreateScope();
            var videoTaskDB = scope.ServiceProvider.GetService<Repository<VideoTask>>();
            
            if (videoTaskDB == null) return;

            var taskData = await videoTaskDB.CopyNew().GetFirstAsync(s => s.Id == tId);
            
            if (taskData.Captions == "[]")
                taskData.Captions = (await Redis.HMGetAsync(RedisExpandKey.Task(task), "Captions")).First();

            taskData.ChatAnalysisScore = 0;
            taskData.ErrorMessage = string.Empty;
            taskData.LastEnum = RedisChannelEnum.结束任务;
            taskData.EndTime = DateTime.Now;
            
            await videoTaskDB.CopyNew().AsUpdateable(taskData)
                .UpdateColumns(it => new
                {
                    it.Captions,
                    it.Speaker,
                    it.ChatAnalysisScore,
                    it.ErrorMessage,
                    it.TotalTokens,
                    it.LastEnum,
                    it.EndTime
                }).ExecuteCommandAsync();
            try
            {
                await ExpandFunction.DeleteTaskAllFileAsync(tId, this);
            }
            catch (Exception)
            {
                throw;
            }
        }
    }
}