import 'dart:async';
import 'dart:io';
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 'package:rxdart/rxdart.dart';

import '../../../../model/delivery.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? _combinedSubscription;

  NoteBloc({
    required this.repository,
    required this.opBloc,
    required this.deliveryId,
  }) : super(NoteInitial()) {
    _combinedSubscription = CombineLatestStream.combine3(
      repository.notes,
      repository.images,
      repository.templates,
      (note, image, templates) => {"note": note, "image": image, "templates": templates},
    ).listen(
      (data) => add(
        DataUpdated(
          images: data["image"] as List<ImageNote>,
          notes: data["note"] as List<Note>,
          templates: data["templates"] as List<NoteTemplate>
        ),
      ),
    );

    on<LoadNote>(_load);
    on<AddNote>(_add);
    on<EditNote>(_edit);
    on<RemoveNote>(_remove);
    on<AddImageNote>(_upload);
    on<RemoveImageNote>(_removeImage);
    on<ResetNotes>(_reset);
    on<DataUpdated>(_dataUpdated);
  }

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

    return super.close();
  }

  Future<void> _dataUpdated(DataUpdated event, Emitter<NoteState> emit) async {
    emit(NoteLoaded(notes: event.notes, images: event.images, templates: event.templates));
  }

  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."),
      );
    }
  }
}