import 'dart:async';
import 'dart:typed_data';

import 'package:flutter/cupertino.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:hl_lieferservice/widget/operations/bloc/operation_bloc.dart';
import 'package:hl_lieferservice/widget/operations/bloc/operation_event.dart';

import 'note_event.dart';
import 'note_state.dart';
import 'package:hl_lieferservice/feature/delivery/detail/repository/note_repository.dart';

class NoteBloc extends Bloc<NoteEvent, NoteState> {
  final NoteRepository repository;
  final OperationBloc opBloc;
  final String deliveryId;

  StreamSubscription? _noteSubscription;
  StreamSubscription? _imageSubscription;

  NoteBloc({required this.repository, required this.opBloc, required this.deliveryId})
      : super(NoteInitial()) {
    repository.loadNotes(deliveryId);

    _noteSubscription = repository.notes.listen((notes) {
      add(NotesUpdated(notes: notes));
    });

    _imageSubscription = repository.images.listen((images) {
      add(ImageUpdated(images: images));
    });

    on<LoadNote>(_load);
    on<AddNote>(_add);
    on<EditNote>(_edit);
    on<RemoveNote>(_remove);
    on<AddImageNote>(_upload);
    on<RemoveImageNote>(_removeImage);
    on<ResetNotes>(_reset);
    on<NotesUpdated>(_noteUpdated);
    on<ImageUpdated>(_imageUpdated);
  }

  @override
  Future<void> close() {
    _noteSubscription?.cancel();
    _imageSubscription?.cancel();

    return super.close();
  }

  Future<void> _imageUpdated(ImageUpdated event, Emitter<NoteState> emit) async {
    final currentState = state;

    if (currentState is NoteLoaded) {
      emit.call(currentState.copyWith(images: event.images));
    }
  }

  Future<void> _noteUpdated(NotesUpdated event, Emitter<NoteState> emit) async {
    emit(NoteLoaded(notes: event.notes));
  }

  Future<void> _reset(ResetNotes event, Emitter<NoteState> emit) async {
    emit.call(NoteInitial());
  }

  Future<void> _removeImage(RemoveImageNote event,
      Emitter<NoteState> emit,) async {
    opBloc.add(LoadOperation());

    try {
      await repository.deleteImage(event.deliveryId, event.objectId);

      opBloc.add(FinishOperation());
    } catch (e, st) {
      debugPrint("Fehler beim Löschen des Bildes: $e");
      debugPrint(st.toString());

      opBloc.add(FailOperation(message: e.toString()));
    }
  }

  Future<void> _upload(AddImageNote event, Emitter<NoteState> emit) async {
    opBloc.add(LoadOperation());

    try {
      Uint8List imageBytes = await event.file.readAsBytes();
      await repository.addImage(event.deliveryId, imageBytes);
      opBloc.add(FinishOperation());
    } catch (e, st) {
      debugPrint("Fehler beim Hinzufügen des Bildes: $e");
      debugPrint(st.toString());

      opBloc.add(FailOperation(message: e.toString()));
    }
  }

  Future<void> _load(LoadNote event, Emitter<NoteState> emit) async {
    emit.call(NoteLoading());

    try {
      List<String> urls =
      event.delivery.images.map((image) => image.url).toList();

      debugPrint("IMAGE URLS : $urls");

      await repository.loadNotes(event.delivery.id);
      await repository.loadTemplates();

      opBloc.add(FinishOperation());
    } catch (e, st) {
      debugPrint("Fehler beim Herunterladen der Notizen: $e");
      debugPrint(st.toString());

      opBloc.add(
        FailOperation(message: "Notizen konnten nicht heruntergeladen werden."),
      );

      emit.call(NoteLoadingFailed());
    }
  }

  Future<void> _add(AddNote event, Emitter<NoteState> emit) async {
    opBloc.add(LoadOperation());

    try {
      await repository.addNote(event.deliveryId, event.note);
      opBloc.add(FinishOperation());
    } catch (e, st) {
      debugPrint("Fehler beim Hinzufügen der Notiz: $e");
      debugPrint(st.toString());

      opBloc.add(FailOperation(message: e.toString()));
    }
  }

  Future<void> _edit(EditNote event, Emitter<NoteState> emit) async {
    opBloc.add(LoadOperation());

    try {
      await repository.editNote(event.noteId, event.content);
      opBloc.add(FinishOperation());
    } catch (e, st) {
      debugPrint("Fehler beim Hinzufügen der Notiz: $e");
      debugPrint(st.toString());

      opBloc.add(FailOperation(message: e.toString()));
    }
  }

  Future<void> _remove(RemoveNote event, Emitter<NoteState> emit) async {
    opBloc.add(LoadOperation());

    try {
      await repository.deleteNote(event.noteId);
      opBloc.add(FinishOperation());
    } catch (e, st) {
      debugPrint("Fehler beim Hinzufügen der Notiz: $e");
      debugPrint(st.toString());

      opBloc.add(
        FailOperation(message: "Notizen konnte nicht gelöscht werden."),
      );
    }
  }
}