using System.Net;
using System.Net.Http;
using VideoDownloader.Core.Config;
using VideoDownloader.Core.Hls;
using VideoDownloader.Core.Models;
using VideoDownloader.Core.Platform;

namespace VideoDownloader.Tests.Platform;

/// <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);
        }
    }
}