using ClaudeDo.Data.Models;
using ClaudeDo.Ui.ViewModels.Islands;
using TaskStatus = ClaudeDo.Data.Models.TaskStatus;

namespace ClaudeDo.Worker.Tests.UiVm;

public class ParseDiffStatTests
{
    [Fact]
    public void Null_Returns_Zero()
    {
        var (add, del) = DetailsIslandViewModel.ParseDiffStat(null);
        Assert.Equal(0, add);
        Assert.Equal(0, del);
    }

    [Fact]
    public void Empty_Returns_Zero()
    {
        var (add, del) = DetailsIslandViewModel.ParseDiffStat("");
        Assert.Equal(0, add);
        Assert.Equal(0, del);
    }

    [Fact]
    public void Full_Stat_Parses_Both()
    {
        var (add, del) = DetailsIslandViewModel.ParseDiffStat("2 files changed, 10 insertions(+), 3 deletions(-)");
        Assert.Equal(10, add);
        Assert.Equal(3, del);
    }

    [Fact]
    public void Insertions_Only_Returns_Zero_Deletions()
    {
        var (add, del) = DetailsIslandViewModel.ParseDiffStat("1 file changed, 5 insertions(+)");
        Assert.Equal(5, add);
        Assert.Equal(0, del);
    }

    [Fact]
    public void Deletions_Only_Returns_Zero_Insertions()
    {
        var (add, del) = DetailsIslandViewModel.ParseDiffStat("1 file changed, 4 deletions(-)");
        Assert.Equal(0, add);
        Assert.Equal(4, del);
    }

    // German-Windows git localizes "insertion(s)"/"deletion(s)" (e.g. "Einfügung(en)"/
    // "Löschung(en)") but keeps the (+)/(-) suffix untranslated — the regex anchors on that.
    [Fact]
    public void German_Locale_Stat_Parses_Both()
    {
        var (add, del) = DetailsIslandViewModel.ParseDiffStat("2 Dateien geändert, 10 Einfügungen(+), 3 Löschungen(-)");
        Assert.Equal(10, add);
        Assert.Equal(3, del);
    }

    [Fact]
    public void German_Locale_Insertions_Only_Returns_Zero_Deletions()
    {
        var (add, del) = DetailsIslandViewModel.ParseDiffStat("1 Datei geändert, 5 Einfügung(en)(+)");
        Assert.Equal(5, add);
        Assert.Equal(0, del);
    }

    // TaskRowViewModel used to run its own broken parser (expecting "+12"/"-3" tokens that
    // `git diff --stat` never emits) — pin it to the same shared, correct parser as the detail badge.
    [Fact]
    public void TaskRowViewModel_UpdateFromEntity_Parses_Real_DiffStat_Format()
    {
        var task = new TaskEntity
        {
            Id = "t1",
            ListId = "l1",
            Title = "task",
            CreatedAt = DateTime.UtcNow,
            Status = TaskStatus.Done,
            Worktree = new WorktreeEntity
            {
                TaskId = "t1",
                Path = "/tmp/wt",
                BranchName = "claudedo/t1",
                BaseCommit = "abc",
                DiffStat = "2 files changed, 10 insertions(+), 3 deletions(-)",
                CreatedAt = DateTime.UtcNow,
            },
        };

        var row = TaskRowViewModel.FromEntity(task);

        Assert.Equal(10, row.DiffAdditions);
        Assert.Equal(3, row.DiffDeletions);
    }
}