using System.Net;
using System.Net.Http;
using VideoDownloader.Core.Update;

namespace VideoDownloader.Tests.Platform;

/// <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("mediabrowser-osx-arm64.tar.gz", "https://dl/osx-arm64"),
            new UpdateAsset("mediabrowser-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 VideoDownloader.Core.Config.AppConfig();
        Assert.Equal("Video-Downloader/releases", config.UpdateRepo);
        Assert.Equal("https://git.chanpaca.net/api/v1", config.UpdateApiBase);
    }
}