calorimeter/lib/food_entry/enter_food_widget.dart

import 'package:calorimeter/utils/enter_food_controller.dart';
import 'package:calorimeter/storage/storage.dart';
import 'package:flutter/material.dart';
import 'package:calorimeter/food_entry/food_entry_bloc.dart';
import 'package:calorimeter/utils/row_with_spacers_widget.dart';
import 'package:provider/provider.dart';

class EnterFoodWidget extends StatefulWidget {
  final Function(BuildContext context, FoodEntry entry) onAdd;

  const EnterFoodWidget({super.key, required this.onAdd});

  @override
  State<EnterFoodWidget> createState() => _EnterFoodWidgetState();
}

class _EnterFoodWidgetState extends State<EnterFoodWidget> {
  late TextEditingController nameController;
  late TextEditingController massController;
  late TextEditingController kcalPerMassController;
  late Map<String, double> suggestions;

  @override
  void initState() {
    nameController = TextEditingController();
    massController = TextEditingController();
    kcalPerMassController = TextEditingController();
    suggestions = FoodStorage.getInstance().getFoodEntryLookupDatabase;

    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Consumer<EnterFoodController>(
      builder: (context, food, child) {
        nameController.text = food.name;
        kcalPerMassController.text = food.kcalPer100g;

        return Padding(
          padding: const EdgeInsets.symmetric(horizontal: 8.0),
          child: RowWidget(
            Autocomplete<String>(
                optionsViewOpenDirection: OptionsViewOpenDirection.down,
                fieldViewBuilder:
                    (context, controller, focusNode, onSubmitted) {
                  nameController = controller;
                  return TextFormField(
                    controller: controller,
                    focusNode: focusNode,
                    decoration: const InputDecoration(
                      label: Text("Name"),
                    ),
                  );
                },
                optionsBuilder: (TextEditingValue textEditingValue) {
                  if (textEditingValue.text == '') {
                    return const Iterable<String>.empty();
                  }

                  return suggestions.keys.where(
                    (name) {
                      return name
                          .toLowerCase()
                          .contains(textEditingValue.text.toLowerCase());
                    },
                  );
                },
                onSelected: (selectedFood) {
                  double kcalPerMassForSelectedFood =
                      suggestions[selectedFood]!;
                  context
                      .read<EnterFoodController>()
                      .set(selectedFood, kcalPerMassForSelectedFood.toString());
                }),
            TextField(
              textAlign: TextAlign.end,
              decoration: const InputDecoration(
                label: Align(
                    alignment: Alignment.centerRight, child: Text("Menge")),
              ),
              keyboardType: TextInputType.number,
              controller: massController,
              onSubmitted: (value) => onSubmitAction(),
            ),
            TextField(
              textAlign: TextAlign.end,
              decoration: const InputDecoration(
                  label: Align(
                      alignment: Alignment.centerRight,
                      child: Text("kcal pro"))),
              keyboardType: TextInputType.number,
              controller: kcalPerMassController,
              onSubmitted: (value) => onSubmitAction(),
            ),
            Padding(
              padding: const EdgeInsets.only(left: 16.0),
              child: ElevatedButton(
                  style: ElevatedButton.styleFrom(
                    padding: EdgeInsets.zero,
                  ),
                  onPressed: () => onSubmitAction(),
                  child: const Icon(Icons.add)),
            ),
          ),
        );
      },
    );
  }

  void onSubmitAction() {
    double massAsNumber = 0.0;
    double kcalPerMassAsNumber = 0.0;

    try {
      massAsNumber = double.parse(massController.text.replaceAll(",", "."));
    } catch (e) {
      var snackbar = const SnackBar(content: Text("Menge muss eine Zahl sein"));
      ScaffoldMessenger.of(context).clearSnackBars();
      ScaffoldMessenger.of(context).showSnackBar(snackbar);
      return;
    }

    try {
      kcalPerMassAsNumber =
          double.parse(kcalPerMassController.text.replaceAll(",", "."));
    } catch (e) {
      var snackbar =
          const SnackBar(content: Text("'kcal pro 100g' muss eine Zahl sein"));
      ScaffoldMessenger.of(context).clearSnackBars();
      ScaffoldMessenger.of(context).showSnackBar(snackbar);
      return;
    }

    var entry = FoodEntry(
        name: nameController.text,
        mass: massAsNumber,
        kcalPerMass: kcalPerMassAsNumber);

    widget.onAdd(context, entry);
    context.read<EnterFoodController>().set("", "");
  }
}