// lib/remote/remote_content_ids.dart

class RemoteContentIds {
  static const int _base = 1000000000;
  static const int _range = 900000000;

  /// Genera un contentId numerico stabile per entry remote.
  ///
  /// Input consigliato:
  /// - uri canonica: `aves-remote://rid/<remoteId>`
  /// - fallback: remotePath
  ///
  /// Non usare String.hashCode per persistenza.
  static int make(String source) {
    final normalized = source.trim();
    if (normalized.isEmpty) {
      return _base;
    }

    final hash = _fnv1a32(normalized);

    return _base + (hash % _range);
  }

  /// FNV-1a 32 bit, deterministico e semplice.
  static int _fnv1a32(String input) {
    const int fnvPrime = 0x01000193;
    int hash = 0x811c9dc5;

    for (final unit in input.codeUnits) {
      hash ^= unit;
      hash = (hash * fnvPrime) & 0xffffffff;
    }

    return hash & 0x7fffffff;
  }
}