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';

class EnterFoodWidget extends StatefulWidget {
  final Function(BuildContext context, FoodEntryState 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, int> suggestions;

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

    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    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) {
              int kcalPerMassForSelectedFood = suggestions[selectedFood]!;
              setState(() {
                nameController.text = selectedFood;
                kcalPerMassController.text =
                    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() {
    int massAsNumber = 0;
    int kcalPerMassAsNumber = 0;

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

    var entry = FoodEntryState(
      name: nameController.text,
      mass: massAsNumber,
      kcalPer100: kcalPerMassAsNumber,
      waitingForNetwork: false,
      isSelected: false,
    );

    widget.onAdd(context, entry);
    setState(() {
      nameController.text = "";
      massController.text = "";
      kcalPerMassController.text = "";
    });
  }
}