import '../models/habit.dart';

/// XOR: build → protocol_id (only); break → break_protocol_id (only).
void assertXorProtocol({
  required HabitType type,
  required String? protocolId,
  required String? breakProtocolId,
}) {
  if (type == HabitType.build) {
    if (protocolId == null || breakProtocolId != null) {
      throw ArgumentError(
          'build habit requires protocol_id and no break_protocol_id');
    }
  } else {
    if (breakProtocolId == null || protocolId != null) {
      throw ArgumentError(
          'break habit requires break_protocol_id and no protocol_id');
    }
  }
}