namespace OmniNX.DesktopInstaller.Services;

public sealed class ExtrasService
{
    private readonly ConfigIniService _config = new();

    public (bool needRam, bool needHekateAms) DetectExtras(string driveRoot)
    {
        var extras = PathUtils.ToDrivePath(driveRoot, "extras");
        var needRam = File.Exists(Path.Combine(extras, "hekate_8gb.bin")) ||
                      File.Exists(Path.Combine(extras, "hekate-pro_8gb.bin"));
        var needHekateAms = Directory.Exists(Path.Combine(extras, "hekate-ams-pro"));
        return (needRam, needHekateAms);
    }

    public void ApplyExtras(
        string driveRoot,
        bool use8GbRam,
        bool useHekateAmsPro,
        IProgress<string>? progress = null)
    {
        _config.MigrateLegacyRamConfig(driveRoot);

        var extras = PathUtils.ToDrivePath(driveRoot, "extras");
        if (!Directory.Exists(extras))
            return;

        var (needRam, needHekateAms) = DetectExtras(driveRoot);
        if (!needRam && !needHekateAms)
            return;

        progress?.Report("Saving RAM / Hekate-AMS selection to config.ini...");
        _config.WriteExtras(driveRoot, needRam, use8GbRam, needHekateAms, useHekateAmsPro);

        if (useHekateAmsPro && needHekateAms)
        {
            progress?.Report("Installing Hekate-Pro / Atmosphere-Pro...");
            ApplyHekateAmsPro(extras, driveRoot, progress);
        }
        else if (needHekateAms)
        {
            progress?.Report("Keeping standard Hekate / Atmosphere.");
        }

        if (needRam)
        {
            progress?.Report("Applying RAM payload setting...");
            Apply8GbPayload(extras, driveRoot, use8GbRam, useHekateAmsPro);
        }

        progress?.Report("Removing extras/...");
        PathUtils.DeletePath(extras);
    }

    private static void ApplyHekateAmsPro(string extrasDir, string driveRoot, IProgress<string>? progress)
    {
        var src = Path.Combine(extrasDir, "hekate-ams-pro");
        if (!Directory.Exists(src))
            return;

        foreach (var entry in Directory.GetFileSystemEntries(src))
        {
            var name = Path.GetFileName(entry);
            var dst = Path.Combine(PathUtils.NormalizeDriveRoot(driveRoot), name);
            if (Directory.Exists(entry))
                PathUtils.CopyDirectory(entry, dst);
            else
                PathUtils.CopyFile(entry, dst);
            progress?.Report($"  Copied: {name}");
        }
    }

    private static void Apply8GbPayload(string extrasDir, string driveRoot, bool use8Gb, bool usePro)
    {
        var hekate8 = Path.Combine(extrasDir, "hekate_8gb.bin");
        var hekatePro8 = Path.Combine(extrasDir, "hekate-pro_8gb.bin");

        if (!use8Gb)
        {
            if (File.Exists(hekate8)) File.Delete(hekate8);
            if (File.Exists(hekatePro8)) File.Delete(hekatePro8);
            return;
        }

        var src = usePro ? hekatePro8 : hekate8;
        if (!File.Exists(src))
            return;

        var payloadDst = PathUtils.ToDrivePath(driveRoot, "payload.bin");
        var updateDst = PathUtils.ToDrivePath(driveRoot, @"bootloader\update.bin");
        PathUtils.CopyFile(src, payloadDst);
        PathUtils.CopyFile(src, updateDst);

        if (File.Exists(hekate8)) File.Delete(hekate8);
        if (File.Exists(hekatePro8)) File.Delete(hekatePro8);
    }
}