using HSchool.Server.Changelog;

namespace HSchool.Server.Tests;

public class BuildChangelogTests
{
    private const string Head = "cccccccccccccccccccccccccccccccccccccccc";
    private const string Mark = "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb";
    private const string Merge = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
    private const string Unknown = "dddddddddddddddddddddddddddddddddddddddd";

    private static readonly string Sample = string.Join('\n',
        Head,
        $"{Head}\u001f2026-01-03T12:00:00Z\u001fAdd changelog window",
        $"{Mark}\u001f2026-01-02T12:00:00Z\u001fMark phase 54 in progress.",
        $"{Merge}\u001f2026-01-01T12:00:00Z\u001fMerge branch 'phase/53-weather-commute'");

    [Fact]
    public void VisibleSince_KnownSha_ReturnsOlderToNewerWithoutMarkPhase()
    {
        var changelog = BuildChangelog.Parse(Sample);

        var visible = changelog.VisibleSince(Merge);

        var commit = Assert.Single(visible);
        Assert.Equal(Head, commit.Sha);
        Assert.Equal("Add changelog window", commit.Subject);
    }

    [Fact]
    public void VisibleSince_MarkPhaseAnchor_StillReturnsLaterVisibleCommits()
    {
        var changelog = BuildChangelog.Parse(Sample);

        var visible = changelog.VisibleSince(Mark);

        var commit = Assert.Single(visible);
        Assert.Equal("Add changelog window", commit.Subject);
    }

    [Fact]
    public void VisibleSince_MissingUnknownOrCurrent_ReturnsEmpty()
    {
        var changelog = BuildChangelog.Parse(Sample);

        Assert.Empty(changelog.VisibleSince(null));
        Assert.Empty(changelog.VisibleSince(""));
        Assert.Empty(changelog.VisibleSince(Unknown));
        Assert.Empty(changelog.VisibleSince(Head));
        Assert.Empty(changelog.VisibleSince(Head.ToUpperInvariant()));
    }

    [Fact]
    public void IsMarkPhase_MatchesStatusLineSubjects()
    {
        Assert.True(BuildChangelog.IsMarkPhase("Mark phase 54 in progress."));
        Assert.True(BuildChangelog.IsMarkPhase("Mark phase 47 romance pack as complete."));
        Assert.False(BuildChangelog.IsMarkPhase("Merge branch 'phase/54-whats-new'"));
    }
}