using AcDream.Content.Pak;
using DatReaderWriter;
using DatReaderWriter.Options;

namespace AcDream.Content.Tests;

public sealed class InstalledPreparedCollisionCatalogTests
{
    [Fact]
    public void InstalledPackage_ContainsAndReadsCanonicalCollisionKeys()
    {
        string? datDir = ResolveDatDir();
        if (datDir is null)
            return;

        string packagePath = Path.Combine(datDir, "acdream.pak");
        if (!File.Exists(packagePath))
            return;

        using var dats = new DatCollection(datDir, DatAccessType.Read);
        using var adapter = new DatCollectionAdapter(dats);
        using var source =
            new PakPreparedAssetSource(packagePath, adapter);

        Assert.Equal(
            PreparedAssetReadStatus.Loaded,
            source.ReadGfxObjCollision(0x0100_0A2Bu).Status);
        Assert.Equal(
            PreparedAssetReadStatus.Loaded,
            source.ReadSetupCollision(0x0200_0001u).Status);
        Assert.Equal(
            PreparedAssetReadStatus.Loaded,
            source.ReadCellStructureCollision(0xA9B4_013Fu).Status);
        Assert.Equal(
            PreparedAssetReadStatus.Loaded,
            source.ReadEnvCellTopology(0xA9B4_013Fu).Status);
        Assert.Equal(4, source.CollisionStats.Loaded);
        Assert.True(source.MappedVirtualBytes > 1L << 30);
    }

    private static string? ResolveDatDir()
    {
        string? configured =
            Environment.GetEnvironmentVariable("ACDREAM_DAT_DIR");
        if (!string.IsNullOrWhiteSpace(configured)
            && Directory.Exists(configured))
        {
            return configured;
        }

        string fallback = Path.Combine(
            Environment.GetFolderPath(
                Environment.SpecialFolder.UserProfile),
            "Documents",
            "Asheron's Call");
        return Directory.Exists(fallback) ? fallback : null;
    }
}