using System.IO;
using System.Net;
using System.Net.Http;
using System.Text;
using Paca.Core;
using Paca.Core.Config;
using Paca.Core.Hls;
using Paca.Core.Models;
using Paca.Core.Platform;
using Paca.Core.Social;
using Paca.Core.Update;
using Xunit;

namespace Paca.Tests.Platform;

/// <summary>
/// 크로스 플랫폼 추상화 & HLS 리먹서 연결 & 자동 업데이트 체커 파이프라인.
/// </summary>


/// <summary>HlsDownloader 가 주입된 IMediaMuxer 를 실제 리먹스 경로에서 사용하는지 검증(RED: ctor 미할당 회귀 방지).</summary>
public class HlsMuxerWiringTests
{
    private sealed class RecordingMuxer : IMediaMuxer
    {
        public int RemuxCalls;
        public Task RemuxAsync(string ffmpeg, string input, string output, CancellationToken ct)
        {
            RemuxCalls++;
            File.WriteAllText(output, "remuxed"); // 성공 시뮬레이션
            return Task.CompletedTask;
        }
        public Task DownloadDashAsync(string ffmpeg, Uri mpdUrl, string output, double durationSec,
            HttpClient http, IProgress<DownloadProgress>? progress, CancellationToken ct) => Task.CompletedTask;
        public string? ResolveFfmpeg(AppConfig config) => "ffmpeg";
    }

    [Fact]
    public async Task HlsDownloader_주입된_뮥서로_리먹스한다()
    {
        if (!OperatingSystem.IsWindows()) return;
        using var server = new HttpListener();
        var port = Random.Shared.Next(20000, 60000);
        server.Prefixes.Add($"http://127.0.0.1:{port}/");
        server.Start();

        var seg = new byte[16];
        using var listenerTask = Task.Run(async () =>
        {
            for (var i = 0; i < 3; i++)
            {
                var ctx = await server.GetContextAsync();
                var path = ctx.Request.Url!.AbsolutePath;
                var body = path.EndsWith(".m3u8")
                    ? "#EXTM3U\n#EXT-X-TARGETDURATION:2\n#EXTINF:2.0,\nseg0.ts\n#EXTINF:2.0,\nseg1.ts\n#EXT-X-ENDLIST\n"
                    : null;
                var buf = body != null ? System.Text.Encoding.UTF8.GetBytes(body) : seg;
                ctx.Response.ContentType = body != null ? "application/vnd.apple.mpegurl" : "video/mp2t";
                await ctx.Response.OutputStream.WriteAsync(buf);
                ctx.Response.Close();
            }
        });

        var muxer = new RecordingMuxer();
        var config = new AppConfig();
        var dl = new HlsDownloader(new HttpClient(), config, muxer);
        var outBase = Path.Combine(Path.GetTempPath(), $"hls-{Guid.NewGuid():N}");
        try
        {
            var result = await dl.DownloadAsync(new Uri($"http://127.0.0.1:{port}/index.m3u8"), outBase);
            Assert.True(muxer.RemuxCalls > 0, "주입한 IMediaMuxer.RemuxAsync 가 호출되어야 한다");
            Assert.EndsWith(".mp4", result);
        }
        finally
        {
            server.Stop();
            try { await listenerTask; } catch { }
            foreach (var f in Directory.GetFiles(Path.GetTempPath(), Path.GetFileName(outBase) + "*"))
                File.Delete(f);
            if (Directory.Exists(outBase + ".parts")) Directory.Delete(outBase + ".parts", true);
        }
    }
}



// ── Fake ─────────────────────────────────────────────────────────────
public sealed class FakeProcessRunner : IProcessRunner
{
    public ProcessSpec? LastSpec;
    public Func<ProcessSpec, Action<string, string>?, CancellationToken, Task<ProcessResult>> Behavior =
        (_, _, _) => Task.FromResult(new ProcessResult(0, "", ""));

    public Task<ProcessResult> RunAsync(ProcessSpec spec, Action<string, string>? onLine, CancellationToken ct)
    {
        LastSpec = spec;
        return Behavior(spec, onLine, ct);
    }
}

// 재구성 ②: Core Platform 추상화 — 모바일(M0) 전제가 되는 프로세스/먹서 주입 검증.
public class ProcessRunnerAbstractionTests
{
    [Fact]
    public async Task DesktopProcessRunner_명령_실행과_캡처_Windows()
    {
        if (!OperatingSystem.IsWindows()) return;
        var runner = new DesktopProcessRunner();
        var res = await runner.RunAsync(
            new ProcessSpec("cmd.exe", new[] { "/c", "echo hello-vd" }), null, CancellationToken.None);
        Assert.Equal(0, res.ExitCode);
        Assert.Contains("hello-vd", res.Stdout);
    }

    [Fact]
    public async Task DesktopProcessRunner_종료코드_전파()
    {
        if (!OperatingSystem.IsWindows()) return;
        var runner = new DesktopProcessRunner();
        var res = await runner.RunAsync(
            new ProcessSpec("cmd.exe", new[] { "/c", "exit 3" }), null, CancellationToken.None);
        Assert.Equal(3, res.ExitCode);
    }

    [Fact]
    public async Task DesktopProcessRunner_라인_탭_스트림_구분()
    {
        if (!OperatingSystem.IsWindows()) return;
        // 인라인 리다이렉션 인용 문제를 피해 스크립트 파일로 stdout/stderr 분리 생성
        var script = Path.Combine(Path.GetTempPath(), $"vd_tap_{Guid.NewGuid():N}.cmd");
        File.WriteAllText(script, "@echo off\r\necho out-line\r\necho err-line 1>&2\r\n");
        try
        {
            var runner = new DesktopProcessRunner();
            var taps = new System.Collections.Concurrent.ConcurrentQueue<(string, string)>();
            var res = await runner.RunAsync(
                new ProcessSpec("cmd.exe", new[] { "/c", script }),
                (s, l) => taps.Enqueue((s, l)), CancellationToken.None);
            Assert.Equal(0, res.ExitCode);
            Assert.Contains(taps.ToArray(), t => t.Item1 == "out" && t.Item2.Contains("out-line"));
            Assert.Contains(taps.ToArray(), t => t.Item1 == "err" && t.Item2.Contains("err-line"));
            Assert.Contains("err-line", res.Stderr);
        }
        finally { try { File.Delete(script); } catch { } }
    }

    [Fact]
    public async Task DesktopProcessRunner_EnvPrefix로_PATH_선두_주입()
    {
        if (!OperatingSystem.IsWindows()) return;
        var runner = new DesktopProcessRunner();
        var marker = Path.GetTempPath(); // PATH 앞에 아무 값 — cmd 는 무시하지만 실행 자체는 검증
        var res = await runner.RunAsync(
            new ProcessSpec("cmd.exe", new[] { "/c", "echo ok" },
                EnvPrefix: new Dictionary<string, string> { ["PATH"] = marker }),
            null, CancellationToken.None);
        Assert.Equal(0, res.ExitCode);
    }
}

public class MediaMuxerAbstractionTests
{
    private static string Ffmpeg => OperatingSystem.IsWindows() ? "ffmpeg.exe" : "ffmpeg";

    [Fact]
    public async Task RemuxAsync는_copy_리먹스_인자를_만든다()
    {
        var fake = new FakeProcessRunner();
        var muxer = new DesktopMediaMuxer(fake);
        await muxer.RemuxAsync(Ffmpeg, "in.ts", "out.mp4", CancellationToken.None);

        var spec = fake.LastSpec!;
        Assert.Equal(Ffmpeg, spec.ExePath);
        Assert.Equal(new[] { "-y", "-hide_banner", "-loglevel", "error", "-i", "in.ts", "-c", "copy", "out.mp4" },
            spec.Args);
    }

    [Fact]
    public async Task RemuxAsync_실패시_stderr_포함_예외()
    {
        var fake = new FakeProcessRunner
        { Behavior = (_, _, _) => Task.FromResult(new ProcessResult(1, "", "boom-err")) };
        var muxer = new DesktopMediaMuxer(fake);
        var ex = await Assert.ThrowsAsync<InvalidOperationException>(
            () => muxer.RemuxAsync(Ffmpeg, "in.ts", "out.mp4", CancellationToken.None));
        Assert.Contains("boom-err", ex.Message);
    }

    [Fact]
    public async Task DownloadDashAsync는_진행률을_파싱해_리포트한다()
    {
        var fake = new FakeProcessRunner
        {
            Behavior = (_, onLine, _) =>
            {
                onLine?.Invoke("out", "out_time_ms=2500000"); // 2.5s / 10s = 25%
                onLine?.Invoke("out", "progress=end");
                return Task.FromResult(new ProcessResult(0, "", ""));
            }
        };
        var muxer = new DesktopMediaMuxer(fake);
        var progress = new SyncProgress<Paca.Core.Models.DownloadProgress>();
        await muxer.DownloadDashAsync(Ffmpeg, new Uri("https://x.test/a.mpd"), "out.mp4",
            durationSec: 10, http: new HttpClient(), progress: progress, CancellationToken.None);

        var spec = fake.LastSpec!;
        Assert.Contains("-progress", spec.Args);
        Assert.Contains("pipe:1", spec.Args);
        Assert.Contains("https://x.test/a.mpd", spec.Args);
        Assert.Contains("+faststart", spec.Args);
        Assert.Contains(progress.Items, r => Math.Abs(r.Percent - 25.0) < 0.01);
    }

    /// <summary>Progress&lt;T&gt; 는 SyncContext 에 큐잉되어 레이스가 나므로 동기 기록용 구현.</summary>
    private sealed class SyncProgress<T> : IProgress<T>
    {
        public readonly List<T> Items = new();
        public void Report(T value) => Items.Add(value);
    }

    [Fact]
    public async Task DownloadDashAsync_실패시_예외()
    {
        var fake = new FakeProcessRunner
        { Behavior = (_, _, _) => Task.FromResult(new ProcessResult(2, "", "dash-fail")) };
        var muxer = new DesktopMediaMuxer(fake);
        var ex = await Assert.ThrowsAsync<InvalidOperationException>(
            () => muxer.DownloadDashAsync(Ffmpeg, new Uri("https://x.test/a.mpd"), "o.mp4", 10,
                new HttpClient(), null, CancellationToken.None));
        Assert.Contains("dash-fail", ex.Message);
    }
}

public class YtDlpRunnerAbstractionTests
{
    [Fact]
    public async Task GetVersionAsync은_주입된_러너로_version_인자와_출력을_해석한다()
    {
        var fake = new FakeProcessRunner
        { Behavior = (spec, _, _) => Task.FromResult(new ProcessResult(0, "2026.07.04\n", "")) };
        var version = await YtDlpRunner.GetVersionAsync("yt-dlp.exe", CancellationToken.None, fake);
        Assert.Equal("2026.07.04", version);
        Assert.Contains("--version", fake.LastSpec!.Args);
        Assert.Equal("yt-dlp.exe", fake.LastSpec.ExePath);
    }

    [Fact]
    public async Task RunCaptureAsync도_주입된_러너를_사용한다()
    {
        var fake = new FakeProcessRunner
        { Behavior = (_, _, _) => Task.FromResult(new ProcessResult(0, "{\"id\":\"x\"}", "")) };
        var (exit, stdout, _) = await YtDlpRunner.RunCaptureAsync(
            "yt-dlp.exe", new[] { "-J", "https://youtu.be/x" }, CancellationToken.None, fake);
        Assert.Equal(0, exit);
        Assert.Contains("{\"id\"", stdout);
    }
}



/// <summary>
/// DEPLOYMENT_PLAN §6 자동 업데이트 v1 — GitHub Releases latest 태그 비교 + 아키텍처별 설치 자산 선택.
/// 네트워크는 가짜 핸들러로 격리.
/// </summary>
public class UpdateCheckerTests
{
    private sealed class FakeHandler : HttpMessageHandler
    {
        private readonly HttpStatusCode _status;
        private readonly string _json;
        public HttpRequestMessage? LastRequest { get; private set; }

        public FakeHandler(HttpStatusCode status, string json)
        {
            _status = status;
            _json = json;
        }

        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken ct)
        {
            LastRequest = request;
            return Task.FromResult(new HttpResponseMessage(_status)
            {
                Content = new StringContent(_json, System.Text.Encoding.UTF8, "application/json"),
            });
        }
    }

    private const string ReleaseJson = """
        {
          "tag_name": "v1.2.0",
          "html_url": "https://github.com/user/videodownloader/releases/tag/v1.2.0",
          "assets": [
            { "name": "VideoDownloader-Setup-x64.exe", "browser_download_url": "https://github.com/user/videodownloader/releases/download/v1.2.0/VideoDownloader-Setup-x64.exe" },
            { "name": "VideoDownloader-Setup-arm64.exe", "browser_download_url": "https://github.com/user/videodownloader/releases/download/v1.2.0/VideoDownloader-Setup-arm64.exe" }
          ]
        }
        """;

    [Theory]
    [InlineData("1.0.0", "v1.2.0", true)]   // 최신이 더 높음
    [InlineData("1.2.0", "v1.2.0", false)]  // 동일
    [InlineData("2.0.0", "v1.9.9", false)]  // 현재가 더 높음
    [InlineData("1.0.0.0", "v1.0.1", true)] // 어셈블리 4자리 버전 허용
    [InlineData("1.0.0", "garbage", false)] // 파싱 불가면 갱신 아님
    public void 버전비교(string current, string latest, bool expected) =>
        Assert.Equal(expected, UpdateChecker.IsNewer(current, latest));

    [Fact]
    public void 자산선택_x64와_arm64_구분()
    {
        var assets = new[]
        {
            new UpdateAsset("VideoDownloader-Setup-x64.exe", "https://dl/x64"),
            new UpdateAsset("VideoDownloader-Setup-arm64.exe", "https://dl/arm64"),
        };

        Assert.Equal("https://dl/x64", UpdateChecker.SelectAsset(assets, "win-x64")!.DownloadUrl);
        Assert.Equal("https://dl/arm64", UpdateChecker.SelectAsset(assets, "win-arm64")!.DownloadUrl);
        Assert.Null(UpdateChecker.SelectAsset(assets, "linux-x64")); // 일치 없음
    }

    [Fact]
    public async Task 최신확인_새버전이면_자산과_릴리스URL()
    {
        var handler = new FakeHandler(HttpStatusCode.OK, ReleaseJson);
        var checker = new UpdateChecker(handler);

        var result = await checker.CheckAsync("user/videodownloader", "1.0.0", "win-x64");

        Assert.NotNull(result);
        Assert.True(result!.IsNewer);
        Assert.Equal("1.2.0", result.LatestVersion);
        Assert.Equal("https://github.com/user/videodownloader/releases/tag/v1.2.0", result.ReleaseUrl);
        Assert.Equal("VideoDownloader-Setup-x64.exe", result.Asset!.Name);

        // 기본 채널(자체 Forgejo) 엔드포인트 + User-Agent(GitHub 채널 호환 규약 유지)
        Assert.Equal("https://git.chanpaca.net/api/v1/repos/user/videodownloader/releases/latest", handler.LastRequest!.RequestUri!.ToString());
        Assert.NotEmpty(handler.LastRequest.Headers.UserAgent);
    }

    [Fact]
    public async Task 최신확인_이미_최신이면_IsNewer_false()
    {
        var checker = new UpdateChecker(new FakeHandler(HttpStatusCode.OK, ReleaseJson));
        var result = await checker.CheckAsync("user/videodownloader", "1.2.0", "win-x64");
        Assert.False(result!.IsNewer);
    }

    [Fact]
    public async Task 최신확인_API_실패는_예외로_드러남()
    {
        var checker = new UpdateChecker(new FakeHandler(HttpStatusCode.NotFound, """{"message":"Not Found"}"""));
        await Assert.ThrowsAsync<HttpRequestException>(() => checker.CheckAsync("user/none", "1.0.0", "win-x64"));
    }

    // ── 배포 채널 전환 (DEPLOYMENT_PLAN §5-bis/§5-ter): 기본 = 자체 Forgejo 공개 릴리스 저장소 ──

    [Fact]
    public async Task 최신확인_기본은_Forgejo_공개저장소_API()
    {
        var handler = new FakeHandler(HttpStatusCode.OK, ReleaseJson);
        var checker = new UpdateChecker(handler);

        await checker.CheckAsync("Video-Downloader/releases", "1.0.0", "win-x64");

        // Forgejo 는 /api/v1 접두가 필요 — GitHub 형태(api.github.com/repos/...)와 경로 규칙만 다르다
        Assert.Equal(
            "https://git.chanpaca.net/api/v1/repos/Video-Downloader/releases/releases/latest",
            handler.LastRequest!.RequestUri!.ToString());
    }

    [Fact]
    public async Task 최신확인_apiBase_지정으로_GitHub_채널도_호환()
    {
        var handler = new FakeHandler(HttpStatusCode.OK, ReleaseJson);
        var checker = new UpdateChecker(handler);

        var result = await checker.CheckAsync("user/videodownloader", "1.0.0", "win-x64",
            apiBase: "https://api.github.com");

        Assert.True(result!.IsNewer);
        Assert.Equal("https://api.github.com/repos/user/videodownloader/releases/latest",
            handler.LastRequest!.RequestUri!.ToString());
    }

    [Fact]
    public void 자산선택_osx는_tar_gz_도_허용()
    {
        // macOS 프리뷰는 dmg 가 아니라 tar.gz 로 배포 중 — dmg 만 허용하면 mac 은 영원히 자산 없음
        var assets = new[]
        {
            new UpdateAsset("Paca-osx-arm64.tar.gz", "https://dl/osx-arm64"),
            new UpdateAsset("Paca-osx-x64.tar.gz", "https://dl/osx-x64"),
        };

        Assert.Equal("https://dl/osx-arm64", UpdateChecker.SelectAsset(assets, "osx-arm64")!.DownloadUrl);
        Assert.Equal("https://dl/osx-x64", UpdateChecker.SelectAsset(assets, "osx-x64")!.DownloadUrl);
    }

    [Fact]
    public void 업데이트_기본채널은_공개릴리스저장소()
    {
        var config = new Paca.Core.Config.AppConfig();
        Assert.Equal("Video-Downloader/releases", config.UpdateRepo);
        Assert.Equal("https://git.chanpaca.net/api/v1", config.UpdateApiBase);
    }
}