import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:graphview/GraphView.dart';
import 'package:syncrow_web/pages/home/bloc/home_event.dart';
import 'package:syncrow_web/pages/home/bloc/home_state.dart';

class HomeBloc extends Bloc<HomeEvent, HomeState> {
  final Graph graph = Graph()..isTree = true;
  final BuchheimWalkerConfiguration builder = BuchheimWalkerConfiguration();
  List<Node> sourcesList = [];
  List<Node> destinationsList = [];

  HomeBloc() : super((HomeInitial())) {
    on<CreateNewNode>(_createNode);
  }

  void _createNode(CreateNewNode event, Emitter<HomeState> emit) async {
    emit(HomeInitial());
    sourcesList.add(event.sourceNode);
    destinationsList.add(event.destinationNode);

    for (int i = 0; i < sourcesList.length; i++) {
      graph.addEdge(sourcesList[i], destinationsList[i]);
    }

    builder
      ..siblingSeparation = (100)
      ..levelSeparation = (150)
      ..subtreeSeparation = (150)
      ..orientation = (BuchheimWalkerConfiguration.ORIENTATION_TOP_BOTTOM);

    emit(HomeUpdateTree(graph: graph, builder: builder));
  }
}