diameter/lib/screens/meal/meal_category_detail.dart

import 'package:diameter/components/detail.dart';
import 'package:diameter/components/dialogs.dart';
import 'package:diameter/components/forms.dart';
import 'package:diameter/config.dart';
import 'package:diameter/navigation.dart';
import 'package:flutter/material.dart';
import 'package:diameter/models/meal_category.dart';

class MealCategoryDetailScreen extends StatefulWidget {
  static const String routeName = '/meal-category';
  final MealCategory? mealCategory;

  const MealCategoryDetailScreen({Key? key, this.mealCategory})
      : super(key: key);

  @override
  _MealCategoryDetailScreenState createState() =>
      _MealCategoryDetailScreenState();
}

class _MealCategoryDetailScreenState extends State<MealCategoryDetailScreen> {
  final GlobalKey<FormState> _mealCategoryForm = GlobalKey<FormState>();
  final _valueController = TextEditingController(text: '');
  final _notesController = TextEditingController(text: '');

  @override
  void initState() {
    super.initState();
    if (widget.mealCategory != null) {
      _valueController.text = widget.mealCategory!.value;
      _notesController.text = widget.mealCategory!.notes ?? '';
    }
  }

  void handleSaveAction() async {
    if (_mealCategoryForm.currentState!.validate()) {
      bool isNew = widget.mealCategory == null;
      isNew
          ? await MealCategory.save(
              value: _valueController.text, notes: _notesController.text)
          : await MealCategory.update(widget.mealCategory!.objectId!,
              value: _valueController.text, notes: _notesController.text);
      Navigator.pop(context, '${isNew ? 'New' : ''} Meal Category saved');
    }
  }

  void handleCancelAction() {
    bool isNew = widget.mealCategory == null;

    if (showConfirmationDialogOnCancel &&
            (isNew &&
                (_valueController.text != '' || _notesController.text != '')) ||
        (!isNew &&
            (widget.mealCategory!.value != _valueController.text ||
                (widget.mealCategory!.notes ?? '') != _notesController.text))) {
      Dialogs.showCancelConfirmationDialog(
        context: context,
        isNew: isNew,
        onSave: handleSaveAction,
      );
    } else {
      Navigator.pop(context);
    }
  }

  @override
  Widget build(BuildContext context) {
    bool isNew = widget.mealCategory == null;
    return Scaffold(
      appBar: AppBar(
        title: Text(isNew ? 'New Meal Category' : widget.mealCategory!.value),
      ),
      drawer:
          const Navigation(currentLocation: MealCategoryDetailScreen.routeName),
      body: SingleChildScrollView(
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: <Widget>[
            StyledForm(
              formState: _mealCategoryForm,
              fields: [
                TextFormField(
                  controller: _valueController,
                  decoration: const InputDecoration(
                    labelText: 'Name',
                  ),
                  validator: (value) {
                    if (value!.trim().isEmpty) {
                      return 'Empty name';
                    }
                    return null;
                  },
                ),
                TextFormField(
                  controller: _notesController,
                  decoration: const InputDecoration(
                    labelText: 'Notes',
                    alignLabelWithHint: true,
                  ),
                  keyboardType: TextInputType.multiline,
                ),
              ],
            ),
          ],
        ),
      ),
      bottomNavigationBar: DetailBottomRow(
        onCancel: handleCancelAction,
        onSave: handleSaveAction,
      ),
    );
  }
}