namespace HSchool.Content.Tests;

public class PackIdentityTests
{
    [Fact]
    public void PackWithoutManifest_UsesIdAsLabelAndHasNoRequires()
    {
        var documents = new[]
        {
            PackDocuments.Def("addon", "traits", "shy", """{ "defName": "Shy", "abstract": true }"""),
        };

        var manifest = PackManifest.FromDocuments("addon", documents);

        Assert.Equal(string.Empty, manifest.Version);
        Assert.Empty(manifest.Requires);
        Assert.Equal("addon", PackManifest.Label("addon", "ru", documents));
        Assert.Equal("addon", PackManifest.Label("addon", "en", documents));
    }

    [Fact]
    public void PackLabel_ComesFromTheRequestedLocale()
    {
        var documents = new[]
        {
            PackDocuments.Manifest(CatalogLoader.CorePackId, """{ "version": "1.0", "requires": [] }"""),
            PackDocuments.Locale(CatalogLoader.CorePackId, "ru", """{ "core": "Базовая игра" }"""),
            PackDocuments.Locale(CatalogLoader.CorePackId, "en", """{ "core": "Core" }"""),
        };

        Assert.Equal("Базовая игра", PackManifest.Label(CatalogLoader.CorePackId, "ru", documents));
        Assert.Equal("Core", PackManifest.Label(CatalogLoader.CorePackId, "en", documents));
        Assert.Equal("1.0", PackManifest.FromDocuments(CatalogLoader.CorePackId, documents).Version);
    }

    [Fact]
    public void VanillaCore_HasManifestAndLocalizedName()
    {
        var root = Path.Combine(AppContext.BaseDirectory, "vanilla");
        var documents = PackDocuments.FromDirectory(CatalogLoader.CorePackId, root);
        var manifest = PackManifest.FromDocuments(CatalogLoader.CorePackId, documents);

        Assert.False(string.IsNullOrWhiteSpace(manifest.Version));
        Assert.Empty(manifest.Requires);
        Assert.Equal("Базовая игра", PackManifest.Label(CatalogLoader.CorePackId, "ru", documents));
        Assert.Equal("Core", PackManifest.Label(CatalogLoader.CorePackId, "en", documents));
    }
}

public class PackLoadOrderTests
{
    [Fact]
    public void MissingRequirement_NamesTheMissingPack()
    {
        var selected = CatalogLoader.NormalizePackOrder(["furniture"]);
        var manifests = new Dictionary<string, PackManifest>(StringComparer.OrdinalIgnoreCase)
        {
            [CatalogLoader.CorePackId] = PackManifest.Empty,
            ["furniture"] = PackManifest.Parse("furniture", """{ "version": "1", "requires": ["base"] }"""),
        };

        var ex = Assert.Throws<PackDependencyException>(() => PackLoadOrder.Resolve(selected, manifests));

        Assert.Equal(PackDependencyException.MissingCode, ex.Code);
        Assert.Equal("base", ex.MissingPackId);
        Assert.Contains("base", ex.Message, StringComparison.Ordinal);
    }

    [Fact]
    public void DependencyListedAfterDependent_StillLoadsFirst()
    {
        var selected = CatalogLoader.NormalizePackOrder(["furniture", "base"]);
        Assert.Equal([CatalogLoader.CorePackId, "furniture", "base"], selected);

        var manifests = new Dictionary<string, PackManifest>(StringComparer.OrdinalIgnoreCase)
        {
            [CatalogLoader.CorePackId] = PackManifest.Empty,
            ["furniture"] = PackManifest.Parse("furniture", """{ "requires": ["base"] }"""),
            ["base"] = PackManifest.Empty,
        };

        var order = PackLoadOrder.Resolve(selected, manifests);

        Assert.Equal([CatalogLoader.CorePackId, "base", "furniture"], order);
    }

    [Fact]
    public void Cycle_IsRejected()
    {
        var selected = CatalogLoader.NormalizePackOrder(["left", "right"]);
        var manifests = new Dictionary<string, PackManifest>(StringComparer.OrdinalIgnoreCase)
        {
            [CatalogLoader.CorePackId] = PackManifest.Empty,
            ["left"] = PackManifest.Parse("left", """{ "requires": ["right"] }"""),
            ["right"] = PackManifest.Parse("right", """{ "requires": ["left"] }"""),
        };

        var ex = Assert.Throws<PackDependencyException>(() => PackLoadOrder.Resolve(selected, manifests));

        Assert.Equal(PackDependencyException.CycleCode, ex.Code);
        Assert.Null(ex.MissingPackId);
    }

    [Fact]
    public void PlayerOrder_IsKeptWhenRequiresDoNotConstrainIt()
    {
        var selected = CatalogLoader.NormalizePackOrder(["zebra", "apple"]);
        var manifests = PackLoadOrder.ManifestsFrom(selected, []);

        var order = PackLoadOrder.Resolve(selected, manifests);

        Assert.Equal([CatalogLoader.CorePackId, "zebra", "apple"], order);
    }
}