import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:pmd_labs/data/repositories/album_repository.dart';
import 'package:pmd_labs/home_page/bloc/state.dart';
import '../home_page.dart';
import 'events.dart';

class HomeBloc extends Bloc<HomeEvent, HomeState> {
  final AlbumRepository repo;

  HomeBloc(this.repo) : super(const HomeState()) {
    on<HomeLoadDataEvent>(_onLoadData);
  }

  Future<void> _onLoadData(HomeLoadDataEvent event, Emitter<HomeState> emit) async {
    if (event.nextPage == null) {
      emit(state.copyWith(isLoading: true));
    } else {
      emit(state.copyWith(isPaginationLoading: true));
    }

    try {
      final data = await repo.loadData(albumName: event.search, page: event.nextPage ?? 1);

      HomeData? updatedData;
      Set<String> existingIds;
      if (event.nextPage != null && state.data != null) {
        final existingData = state.data!.data ?? [];
        final newDataList = data;
        existingIds = existingData.map((item) => item.id).toSet();
        final newData = newDataList?.where((newItem) => !existingIds.contains(newItem.id)).toList();
        updatedData = HomeData(data: [...existingData, ...?newData], nextPage: (event.nextPage ?? 1) + 1);
      } else {
        updatedData = HomeData(data: data, nextPage: (event.nextPage ?? 1) + 1);
      }

      emit(state.copyWith(data: updatedData, isLoading: false, isPaginationLoading: false));
    } catch (e) {
      emit(state.copyWith(isLoading: false, isPaginationLoading: false));
      print("Error loading data: $e");
    }
  }
}