namespace WxAgent.Core;

public sealed record AccountDatabaseEntry(string Fingerprint, string RelativePath);

/// <summary>Decides which verified keys may be reused from cache, avoiding repeated memory scans for cached accounts.</summary>
public static class KeyCachePlanner
{
    public static string Key(string accountFingerprint, string relativePath) =>
        $"{accountFingerprint}|{relativePath}";

    public static IReadOnlySet<string> VerifiedKeys(IEnumerable<AccountKeySet> cached)
    {
        var set = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
        foreach (var account in cached)
            foreach (var database in account.Databases)
                set.Add(Key(account.AccountRootFingerprint, database.RelativePath));
        return set;
    }

    public static bool HasPending(IEnumerable<AccountDatabaseEntry> discovered, IReadOnlySet<string> verified)
    {
        foreach (var entry in discovered)
        {
            if (!verified.Contains(Key(entry.Fingerprint, entry.RelativePath)))
            {
                return true;
            }
        }

        return false;
    }
}