using System.Text.Json;
using StellaOps.AuditPack.Models;

namespace StellaOps.AuditPack.Services;

public sealed partial class AuditBundleReader
{
    private static async Task<ManifestLoadResult> LoadManifestAsync(
        string bundleDir,
        CancellationToken ct)
    {
        var manifestPath = Path.Combine(bundleDir, "manifest.json");
        if (!File.Exists(manifestPath))
        {
            return new ManifestLoadResult(false, "Manifest not found in bundle", null, null);
        }

        var manifestBytes = await File.ReadAllBytesAsync(manifestPath, ct).ConfigureAwait(false);
        var manifest = JsonSerializer.Deserialize<AuditBundleManifest>(manifestBytes, _jsonOptions);
        if (manifest is null)
        {
            return new ManifestLoadResult(false, "Failed to parse manifest", null, manifestBytes);
        }

        return new ManifestLoadResult(true, null, manifest, manifestBytes);
    }
}