import '../lifecycle/runtime_session.dart';
import '../models/runtime_event.dart';

class RuntimeEventGate {
  const RuntimeEventGate({
    required this.session,
    required bool Function(String id) isScopeAlive,
    bool Function(String id, int epoch)? isNodeEpochAlive,
  }) : _isScopeAlive = isScopeAlive,
       _isNodeEpochAlive = isNodeEpochAlive;

  final RuntimeSession session;
  final bool Function(String id) _isScopeAlive;
  final bool Function(String id, int epoch)? _isNodeEpochAlive;

  RuntimeEvent attachSession(RuntimeEvent event) {
    return event.withLifecycle(sessionId: event.sessionId ?? session.id);
  }

  bool accepts(RuntimeEvent event) {
    final eventSessionId = event.sessionId;
    if (eventSessionId != null && !session.accepts(eventSessionId)) {
      return false;
    }

    final target = event.target;
    final targetEpoch = event.targetEpoch;
    final epochChecker = _isNodeEpochAlive;
    if (target != null && targetEpoch != null && epochChecker != null) {
      if (!epochChecker(target, targetEpoch)) {
        return false;
      }
    }

    final scope = event.scope;
    if (scope != null && !_isScopeAlive(scope)) {
      return false;
    }
    final scopeEpoch = event.scopeEpoch;
    if (scope != null && scopeEpoch != null && epochChecker != null) {
      if (!epochChecker(scope, scopeEpoch)) {
        return false;
      }
    }
    return true;
  }
}