import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:quiver/core.dart';

class FoodEntryBloc extends Bloc<FoodEntryEvent, FoodEntryState> {
  FoodEntryBloc(super.initialState) {
    on<FoodEntryEvent>(addFoodEntryToState);
  }

  void addFoodEntryToState(FoodEntryEvent event, Emitter<FoodEntryState> emit) {
    FoodEntryState newState = FoodEntryState.from(state);
    newState.addEntry(event.entry);
    emit(newState);
  }
}

class FoodEntryEvent {
  final FoodEntry entry;
  FoodEntryEvent({required this.entry});
}

class FoodEntryState {
  final List<FoodEntry> foodEntries;

  FoodEntryState({required this.foodEntries});

  factory FoodEntryState.init() {
    return FoodEntryState(foodEntries: []);
  }

  static from(FoodEntryState state) {
    List<FoodEntry> newList = List.from(state.foodEntries);
    return FoodEntryState(foodEntries: newList);
  }

  void addEntry(FoodEntry entry) {
    foodEntries.add(entry);
  }

  @override
  int get hashCode {
    return hashObjects(foodEntries);
  }

  @override
  operator ==(other) {
    if (other.runtimeType != FoodEntryState) return false;

    other = other as FoodEntryState;

    if (foodEntries.length != other.foodEntries.length) return false;

    for (var i = 0; i < foodEntries.length; i += 1) {
      if (foodEntries[i].name != other.foodEntries[i].name ||
          foodEntries[i].mass != other.foodEntries[i].mass ||
          foodEntries[i].kcalPerMass != other.foodEntries[i].kcalPerMass ||
          foodEntries[i].kcal != other.foodEntries[i].kcal) {
        return false;
      }
    }
    return true;
  }
}

class FoodEntry {
  final String name;
  final double mass;
  final double kcalPerMass;
  final double kcal;

  FoodEntry({
    required this.name,
    required this.mass,
    required this.kcalPerMass,
    required this.kcal,
  });
}