using System;
using System.IO;
using System.Linq;
using static StellaOps.Localization.T;

namespace StellaOps.Cryptography.Kms;

public sealed partial class FileKmsClient
{
    private static string GetMetadataPath(string root, string keyId)
        => Path.Combine(root, keyId, "metadata.json");

    private string GetKeyDirectory(string keyId)
    {
        var path = Path.Combine(_options.RootPath, keyId);
        Directory.CreateDirectory(path);
        return path;
    }

    private static KeyVersionRecord ResolveVersion(KeyMetadataRecord record, string? keyVersion)
    {
        KeyVersionRecord? version = null;
        if (!string.IsNullOrWhiteSpace(keyVersion))
        {
            version = record.Versions.SingleOrDefault(v => string.Equals(v.VersionId, keyVersion, StringComparison.Ordinal));
            if (version is null)
            {
                throw new InvalidOperationException(_t("crypto.kms.key_version_not_found", keyVersion, record.KeyId));
            }
        }
        else if (!string.IsNullOrWhiteSpace(record.ActiveVersion))
        {
            version = record.Versions.SingleOrDefault(v => string.Equals(v.VersionId, record.ActiveVersion, StringComparison.Ordinal));
        }

        version ??= record.Versions
            .Where(v => v.State == KmsKeyState.Active)
            .OrderByDescending(v => v.CreatedAt)
            .FirstOrDefault();

        if (version is null)
        {
            throw new InvalidOperationException(_t("crypto.kms.key_no_active_version", record.KeyId));
        }

        return version;
    }
}