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/models/accuracy.dart';
import 'package:diameter/models/meal.dart';
import 'package:diameter/models/meal_category.dart';
import 'package:diameter/models/meal_portion_type.dart';
import 'package:diameter/models/meal_source.dart';
import 'package:diameter/navigation.dart';
import 'package:diameter/settings.dart';
import 'package:flutter/material.dart';

class MealDetailScreen extends StatefulWidget {
  static const String routeName = '/meal';

  final Meal? meal;
  const MealDetailScreen({Key? key, this.meal}) : super(key: key);

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

class _MealDetailScreenState extends State<MealDetailScreen> {
  final GlobalKey<FormState> _mealForm = GlobalKey<FormState>();
  final _valueController = TextEditingController();
  final _carbsRatioController = TextEditingController();
  final _portionSizeController = TextEditingController();
  final _carbsPerPortionController = TextEditingController();
  final _delayedBolusRateController = TextEditingController();
  final _delayedBolusDurationController = TextEditingController();
  final _notesController = TextEditingController();
  String? _source;
  String? _category;
  String? _portionType;
  String? _portionSizeAccuracy;
  String? _carbsRatioAccuracy;

  late Future<List<MealCategory>> _mealCategories;
  late Future<List<MealPortionType>> _mealPortionTypes;
  late Future<List<MealSource>> _mealSources;
  late Future<List<Accuracy>> _portionSizeAccuracies;
  late Future<List<Accuracy>> _carbsRatioAccuracies;

  @override
  void initState() {
    super.initState();

    if (widget.meal != null) {
      _valueController.text = widget.meal!.value;
      _carbsRatioController.text = (widget.meal!.carbsRatio ?? '').toString();
      _portionSizeController.text = (widget.meal!.portionSize ?? '').toString();
      _carbsPerPortionController.text =
          (widget.meal!.carbsPerPortion ?? '').toString();
      _delayedBolusRateController.text =
          (widget.meal!.delayedBolusRate ?? '').toString();
      _delayedBolusDurationController.text =
          (widget.meal!.delayedBolusDuration ?? '').toString();
      _notesController.text = widget.meal!.notes ?? '';

      _source = widget.meal!.source;
      _category = widget.meal!.category;
      _portionType = widget.meal!.portionType;
      _portionSizeAccuracy = widget.meal!.portionSizeAccuracy;
      _carbsRatioAccuracy = widget.meal!.carbsRatioAccuracy;
    }

    _mealCategories = MealCategory.fetchAll();
    _mealPortionTypes = MealPortionType.fetchAll();
    _mealSources = MealSource.fetchAll();
    _portionSizeAccuracies = Accuracy.fetchAllForPortionSize();
    _carbsRatioAccuracies = Accuracy.fetchAllForCarbsRatio();
  }

  void handleSaveAction() async {
    if (_mealForm.currentState!.validate()) {
      bool isNew = widget.meal == null;
      isNew
          ? await Meal.save(
              value: _valueController.text,
              source: _source,
              category: _category,
              portionType: _portionType,
              carbsRatio: double.tryParse(_carbsRatioController.text),
              portionSize: double.tryParse(_portionSizeController.text),
              carbsPerPortion: double.tryParse(_carbsPerPortionController.text),
              portionSizeAccuracy: _portionSizeAccuracy,
              carbsRatioAccuracy: _carbsRatioAccuracy,
              delayedBolusDuration:
                  int.tryParse(_delayedBolusDurationController.text),
              delayedBolusRate:
                  double.tryParse(_delayedBolusRateController.text),
              notes: _notesController.text,
            )
          : await Meal.update(
              widget.meal!.objectId!,
              value: _valueController.text,
              source: _source,
              category: _category,
              portionType: _portionType,
              carbsRatio: double.tryParse(_carbsRatioController.text),
              portionSize: double.tryParse(_portionSizeController.text),
              carbsPerPortion: double.tryParse(_carbsPerPortionController.text),
              portionSizeAccuracy: _portionSizeAccuracy,
              carbsRatioAccuracy: _carbsRatioAccuracy,
              delayedBolusDuration:
                  int.tryParse(_delayedBolusDurationController.text),
              delayedBolusRate:
                  double.tryParse(_delayedBolusRateController.text),
              notes: _notesController.text,
            );
      Navigator.pop(context, '${isNew ? 'New' : ''} Meal Saved');
    }
  }

  void handleCancelAction() {
    bool isNew = widget.meal == null;
    if (showConfirmationDialogOnCancel &&
        ((isNew &&
                (_valueController.text != '' ||
                    _source != null ||
                    _category != null ||
                    _portionType != null ||
                    double.tryParse(_carbsRatioController.text) != null ||
                    double.tryParse(_portionSizeController.text) != null ||
                    double.tryParse(_carbsPerPortionController.text) != null ||
                    _carbsRatioAccuracy != null ||
                    _portionSizeAccuracy != null ||
                    int.tryParse(_delayedBolusDurationController.text) !=
                        null ||
                    double.tryParse(_delayedBolusRateController.text) != null ||
                    _notesController.text != '')) ||
            (!isNew &&
                (_valueController.text != widget.meal!.value ||
                    _source != widget.meal!.source ||
                    _category != widget.meal!.category ||
                    _portionType != widget.meal!.portionType ||
                    double.tryParse(_carbsRatioController.text) !=
                        widget.meal!.carbsRatio ||
                    double.tryParse(_portionSizeController.text) !=
                        widget.meal!.portionSize ||
                    double.tryParse(_carbsPerPortionController.text) !=
                        widget.meal!.carbsPerPortion ||
                    _carbsRatioAccuracy != widget.meal!.carbsRatioAccuracy ||
                    _portionSizeAccuracy != widget.meal!.portionSizeAccuracy ||
                    int.tryParse(_delayedBolusDurationController.text) !=
                        widget.meal!.delayedBolusDuration ||
                    double.tryParse(_delayedBolusRateController.text) !=
                        widget.meal!.delayedBolusRate ||
                    _notesController.text != (widget.meal!.notes ?? ''))))) {
      Dialogs.showCancelConfirmationDialog(
        context: context,
        isNew: isNew,
        onSave: handleSaveAction,
      );
    } else {
      Navigator.pop(context);
    }
  }

  @override
  Widget build(BuildContext context) {
    bool isNew = widget.meal == null;
    return Scaffold(
      appBar: AppBar(
        title: Text(isNew ? 'New Meal' : widget.meal!.value),
      ),
      drawer: const Navigation(currentLocation: MealDetailScreen.routeName),
      body: SingleChildScrollView(
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: <Widget>[
            StyledForm(
              formState: _mealForm,
              fields: [
                TextFormField(
                  controller: _valueController,
                  decoration: const InputDecoration(
                    labelText: 'Name',
                  ),
                  validator: (value) {
                    if (value!.trim().isEmpty) {
                      return 'Empty name';
                    }
                    return null;
                  },
                ),
                StyledFutureDropdownButton<MealSource>(
                  selectedItem: _source,
                  label: 'Meal Source',
                  items: _mealSources,
                  getItemValue: (item) => item.objectId,
                  renderItem: (item) => Text(item.value),
                  onChanged: (value) {
                    setState(() {
                      _source = value;
                    });
                  },
                ),
                // TODO: autofill the following fields on selecting a source
                StyledFutureDropdownButton<MealCategory>(
                  selectedItem: _category,
                  label: 'Meal Category',
                  items: _mealCategories,
                  getItemValue: (item) => item.objectId,
                  renderItem: (item) => Text(item.value),
                  onChanged: (value) {
                    setState(() {
                      _category = value;
                    });
                  },
                ),
                StyledFutureDropdownButton<MealPortionType>(
                  selectedItem: _portionType,
                  label: 'Meal Portion Type',
                  items: _mealPortionTypes,
                  getItemValue: (item) => item.objectId,
                  renderItem: (item) => Text(item.value),
                  onChanged: (value) {
                    setState(() {
                      _portionType = value;
                    });
                  },
                ),
                // TODO: if 2 out of the 3 following fields are given, calc 3rd
                TextFormField(
                  decoration: const InputDecoration(
                    labelText: 'Carbs ratio',
                    suffixText: '%',
                  ),
                  controller: _carbsRatioController,
                  keyboardType:
                      const TextInputType.numberWithOptions(decimal: true),
                ),
                TextFormField(
                  decoration: InputDecoration(
                    labelText: 'Portion size',
                    suffixText: nutritionMeasurement ==
                            NutritionMeasurement.grams
                        ? 'g'
                        : nutritionMeasurement == NutritionMeasurement.ounces
                            ? 'oz'
                            : '',
                    alignLabelWithHint: true,
                  ),
                  controller: _portionSizeController,
                  keyboardType:
                      const TextInputType.numberWithOptions(decimal: true),
                ),
                TextFormField(
                  decoration: InputDecoration(
                    labelText: 'Carbs per portion',
                    suffixText: nutritionMeasurement ==
                            NutritionMeasurement.grams
                        ? 'g'
                        : nutritionMeasurement == NutritionMeasurement.ounces
                            ? 'oz'
                            : '',
                  ),
                  controller: _carbsPerPortionController,
                  keyboardType:
                      const TextInputType.numberWithOptions(decimal: true),
                ),
                StyledFutureDropdownButton<Accuracy>(
                  selectedItem: _carbsRatioAccuracy,
                  label: 'Carbs Ratio Accuracy',
                  items: _carbsRatioAccuracies,
                  getItemValue: (item) => item.objectId,
                  renderItem: (item) => Text(item.value),
                  onChanged: (value) {
                    setState(() {
                      _carbsRatioAccuracy = value;
                    });
                  },
                ),
                // TODO: display according to time format
                TextFormField(
                  decoration: const InputDecoration(
                    labelText: 'Delayed Bolus Duration',
                    suffixText: ' min',
                  ),
                  controller: _delayedBolusDurationController,
                  keyboardType: const TextInputType.numberWithOptions(),
                ),
                TextFormField(
                  decoration: const InputDecoration(
                    labelText: 'Delayed Bolus Units',
                    suffixText: ' U',
                  ),
                  controller: _delayedBolusRateController,
                  keyboardType:
                      const TextInputType.numberWithOptions(decimal: true),
                ),
                // TODO: autofill the following fields on selecting a source
                StyledFutureDropdownButton<Accuracy>(
                  selectedItem: _portionSizeAccuracy,
                  label: 'Portion Size Accuracy',
                  items: _portionSizeAccuracies,
                  getItemValue: (item) => item.objectId,
                  renderItem: (item) => Text(item.value),
                  onChanged: (value) {
                    setState(() {
                      _portionSizeAccuracy = value;
                    });
                  },
                ),
                TextFormField(
                  controller: _notesController,
                  decoration: const InputDecoration(
                    labelText: 'Notes',
                    alignLabelWithHint: true,
                  ),
                  keyboardType: TextInputType.multiline,
                ),
              ],
            ),
          ],
        ),
      ),
      bottomNavigationBar: DetailBottomRow(
        onCancel: handleCancelAction,
        onSave: handleSaveAction,
      ),
    );
  }
}