using LiveRecorder.Application.Abstractions.Logging;
using LiveRecorder.Application.Abstractions.Recording;
using LiveRecorder.Application.Models.Logs;
using LiveRecorder.Domain.Entities;
using LiveRecorder.Domain.Enums;
using LiveRecorder.Infrastructure.Persistence;
using LiveRecorder.Infrastructure.Services;
using Microsoft.EntityFrameworkCore;

namespace LiveRecorder.Tests;

public sealed class RecoveryServiceTests : IDisposable
{
    private readonly string _temporaryDirectory = Path.Combine(
        Path.GetTempPath(),
        $"liverecorder-artifact-recovery-{Guid.NewGuid():N}");

    [Fact]
    public async Task AcceptShortArtifact_RequiresConfirmationThenLeavesItForManualUpload()
    {
        Directory.CreateDirectory(_temporaryDirectory);
        var mediaPath = Path.Combine(_temporaryDirectory, "short-fragment.mp4");
        await File.WriteAllBytesAsync(mediaPath, [1, 2, 3, 4]);
        await using var context = CreateContext();
        var taskId = await SeedFailedTaskAsync(context, mediaPath, durationSeconds: 3);
        var service = CreateService(context, new VideoMetadata(3, 1920, 1080, "h264", "aac", 30, 2_000_000));

        var rejected = await service.AcceptRecordingArtifactAsync(taskId, confirmShortArtifact: false);

        Assert.Equal(0, rejected.SuccessCount);
        Assert.Contains("需要确认短分片", rejected.Messages.Single());
        Assert.Equal(RecordTaskStatus.Failed, (await context.RecordTasks.FindAsync(taskId))!.Status);

        var accepted = await service.AcceptRecordingArtifactAsync(taskId, confirmShortArtifact: true);

        Assert.Equal(1, accepted.SuccessCount);
        var task = await context.RecordTasks.Include(item => item.Result).SingleAsync(item => item.Id == taskId);
        Assert.Equal(RecordTaskStatus.Completed, task.Status);
        Assert.Equal(RecordArtifactUploadStatus.NotUploaded, task.Result!.UploadStatus);
        Assert.Null(task.Result.LastUploadProvider);
        Assert.Null(task.Result.LastUploadedAt);
        Assert.Null(task.Result.UploadErrorMessage);
        Assert.True(File.Exists(mediaPath));
    }

    [Fact]
    public async Task ListFailures_IdentifiesMissingMediaAsUnrecoverable()
    {
        Directory.CreateDirectory(_temporaryDirectory);
        var missingPath = Path.Combine(_temporaryDirectory, "missing.mp4");
        await using var context = CreateContext();
        await SeedFailedTaskAsync(context, missingPath, durationSeconds: 120);
        var service = CreateService(context, metadata: null);

        var response = await service.ListRecordingFailuresAsync("MissingMedia", 0, 20);

        var item = Assert.Single(response.Items);
        Assert.Equal("MissingMedia", item.FailureKind);
        Assert.False(item.FileExists);
        Assert.False(item.CanAccept);
        Assert.False(item.CanRepair);
    }

    private static LiveRecorderDbContext CreateContext()
    {
        var options = new DbContextOptionsBuilder<LiveRecorderDbContext>()
            .UseInMemoryDatabase($"artifact-recovery-{Guid.NewGuid():N}")
            .Options;
        return new LiveRecorderDbContext(options);
    }

    private static async Task<Guid> SeedFailedTaskAsync(
        LiveRecorderDbContext context,
        string mediaPath,
        double durationSeconds)
    {
        var now = DateTimeOffset.UtcNow;
        var room = new LiveRoom(
            LivePlatformType.Douyin,
            "https://live.example/recovery",
            "recovery-room",
            "https://live.example/recovery",
            now.AddHours(-1));
        room.UpdateMetadata("恢复测试直播间", "恢复主播", null, null, null, now.AddHours(-1));
        var session = new RecordSession(
            room.Id,
            "origin",
            RecordOutputFormat.Mp4,
            RecordSaveMode.Segmented,
            now.AddMinutes(-10));
        session.MarkFailed("ffmpeg exited unexpectedly", now);
        var task = new RecordTask(
            room.Id,
            session.Id,
            1,
            "origin",
            RecordOutputFormat.Mp4,
            now.AddMinutes(-10));
        task.MarkStarting("https://stream.example/recovery", mediaPath, now.AddMinutes(-10));
        task.MarkFailed("ffmpeg exited unexpectedly", now, durationSeconds);
        var result = new RecordResult(
            task.Id,
            mediaPath,
            File.Exists(mediaPath) ? new FileInfo(mediaPath).Length : null,
            durationSeconds,
            null,
            0,
            RecordTaskStatus.Failed,
            task.ErrorMessage,
            now);
        result.MarkUploadFailed("openlist", "previous upload error", now);

        context.AddRange(room, session, task, result);
        await context.SaveChangesAsync();
        return task.Id;
    }

    private static RecoveryService CreateService(LiveRecorderDbContext context, VideoMetadata? metadata) =>
        new(
            context,
            systemSettingsService: null!,
            storageGuardService: null!,
            ffmpegService: null!,
            recordService: null!,
            videoMetadataService: new FixedVideoMetadataService(metadata),
            systemLogService: new NullSystemLogService());

    public void Dispose()
    {
        if (Directory.Exists(_temporaryDirectory))
        {
            Directory.Delete(_temporaryDirectory, recursive: true);
        }
    }

    private sealed class FixedVideoMetadataService(VideoMetadata? metadata) : IVideoMetadataService
    {
        public Task<VideoMetadata?> ExtractMetadataAsync(
            string filePath,
            CancellationToken cancellationToken = default) => Task.FromResult(metadata);

        public Task<string?> GenerateThumbnailAsync(
            string filePath,
            string outputDir,
            CancellationToken cancellationToken = default) => Task.FromResult<string?>(null);
    }

    private sealed class NullSystemLogService : ISystemLogService
    {
        public Task WriteAsync(
            SystemLogLevel level,
            string category,
            string message,
            string? detail = null,
            Guid? liveRoomId = null,
            Guid? recordSessionId = null,
            Guid? recordTaskId = null,
            CancellationToken cancellationToken = default) => Task.CompletedTask;

        public Task<IReadOnlyList<SystemLogDto>> ListAsync(
            Guid? liveRoomId = null,
            Guid? recordSessionId = null,
            Guid? recordTaskId = null,
            SystemLogLevel? level = null,
            string? content = null,
            int take = 200,
            CancellationToken cancellationToken = default) =>
            Task.FromResult<IReadOnlyList<SystemLogDto>>([]);
    }
}