import 'package:diameter/components/detail.dart';
import 'package:diameter/components/dialogs.dart';
import 'package:diameter/components/dropdown.dart';
import 'package:diameter/components/forms.dart';
import 'package:diameter/config.dart';
import 'package:diameter/models/bolus.dart';
import 'package:diameter/models/log_bolus.dart';
import 'package:diameter/models/log_entry.dart';
import 'package:diameter/models/log_meal.dart';
import 'package:diameter/navigation.dart';
import 'package:diameter/settings.dart';
import 'package:flutter/material.dart';

class LogBolusDetailScreen extends StatefulWidget {
  static const String routeName = '/log-bolus';

  final int logEntryId;
  final int id;

  const LogBolusDetailScreen({Key? key, this.logEntryId = 0, this.id = 0})
      : super(key: key);

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

class _LogBolusDetailScreenState extends State<LogBolusDetailScreen> {
  LogEntry? _logEntry;
  LogBolus? _logBolus;

  bool _isNew = true;
  bool _isSaving = false;

  final GlobalKey<FormState> _logBolusForm = GlobalKey<FormState>();

  final _unitsController = TextEditingController(text: '');
  final _carbsController = TextEditingController(text: '');
  final _mgPerDlController = TextEditingController(text: '');
  final _mmolPerLController = TextEditingController(text: '');
  final _delayController = TextEditingController(text: '');
  final _notesController = TextEditingController(text: '');

  bool _manuallyAdjusted = false;
  LogMeal? _meal;
  Bolus? _rate;

  List<LogMeal> _logMeals = [];

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

    _logEntry = LogEntry.get(widget.logEntryId);
    _logMeals = _logEntry?.meals ?? [];

    if (widget.id != 0) {
      _unitsController.text = _logBolus!.units.toString();
      _carbsController.text = (_logBolus!.carbs ?? '').toString();
      _mgPerDlController.text = (_logBolus!.mgPerDl ?? '').toString();
      _mmolPerLController.text = (_logBolus!.mmolPerL ?? '').toString();
      _delayController.text = (_logBolus!.delay ?? '').toString();
      _notesController.text = _logBolus!.notes ?? '';
      _manuallyAdjusted = _logBolus!.manuallyAdjusted;
      _meal = _logBolus!.meal.target;
      _rate = _logBolus!.rate.target ?? Bolus.getRateForTime(_logEntry?.time);
    }
  }

  void reload() {
    if (widget.id != 0) {
      setState(() {
        _logBolus = LogBolus.get(widget.id);
      });
    }
    _isNew = _logBolus == null;
  }

  Future<void> onSelectMeal(LogMeal meal) async {
    setState(() {
      _meal = meal;
      if (meal.carbsPerPortion != null) {
        _carbsController.text = meal.carbsPerPortion.toString();

        if (_rate != null) {
          _unitsController.text =
              (meal.carbsPerPortion ?? 0 / (_rate!.carbs / _rate!.units))
                  .toString();
        }
      }
    });
  }

  void handleSaveAction() async {
    setState(() {
      _isSaving = true;
    });
    if (_logBolusForm.currentState!.validate()) {
      LogBolus logBolus = LogBolus(
        id: widget.id,
        units: double.tryParse(_unitsController.text) ?? 0,
        carbs: double.tryParse(_carbsController.text),
        mgPerDl: int.tryParse(_mgPerDlController.text),
        mmolPerL: double.tryParse(_mmolPerLController.text),
        delay: int.tryParse(_delayController.text),
        manuallyAdjusted: _manuallyAdjusted,
        notes: _notesController.text,
      );
      logBolus.logEntry.target = _logEntry;
      logBolus.meal.target = _meal;
      logBolus.rate.target = _rate;
      LogBolus.put(logBolus);
      Navigator.pop(context, '${_isNew ? 'New' : ''} Bolus Saved');
    }
    setState(() {
      _isSaving = false;
    });
  }

  void handleCancelAction() {
    if (showConfirmationDialogOnCancel &&
        ((_isNew &&
                (_unitsController.text != '' ||
                    _carbsController.text != '' ||
                    _mgPerDlController.text != '' ||
                    _mmolPerLController.text != '' ||
                    _delayController.text != '' ||
                    _manuallyAdjusted ||
                    _notesController.text != '')) ||
            (!_isNew &&
                (double.tryParse(_unitsController.text) != _logBolus!.units ||
                    double.tryParse(_carbsController.text) != _logBolus!.carbs ||
                    int.tryParse(_mgPerDlController.text) != _logBolus!.mgPerDl ||
                    double.tryParse(_mmolPerLController.text) != _logBolus!.mmolPerL ||
                    int.tryParse(_delayController.text) != _logBolus!.delay ||
                    _manuallyAdjusted != _logBolus!.manuallyAdjusted ||
                    _notesController.text != (_logBolus!.notes ?? ''))))) {
      Dialogs.showCancelConfirmationDialog(
        context: context,
        isNew: _isNew,
        onSave: handleSaveAction,
      );
    } else {
      Navigator.pop(context);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(_isNew ? 'New Bolus' : 'Edit Bolus'),
      ),
      drawer: const Navigation(currentLocation: LogBolusDetailScreen.routeName),
      body: SingleChildScrollView(
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: <Widget>[
            FormWrapper(
              formState: _logBolusForm,
              fields: [
                TextFormField(
                  decoration: const InputDecoration(
                    labelText: 'Bolus Units',
                    suffixText: ' U',
                  ),
                  controller: _unitsController,
                  keyboardType:
                      const TextInputType.numberWithOptions(decimal: true),
                ),
                AutoCompleteDropdownButton<LogMeal>(
                  selectedItem: _meal,
                  label: 'Meal',
                  items: _logMeals,
                  renderItem: (item) => item.value,
                  onChanged: (value) {
                    if (value != null) {
                      onSelectMeal(value);
                    }
                  },
                ),
                Expanded(
                      child: TextFormField(
                        decoration: InputDecoration(
                          labelText: 'Carbs',
                          suffixText:
                              nutritionMeasurement == NutritionMeasurement.grams
                                  ? 'g'
                                  : nutritionMeasurement ==
                                          NutritionMeasurement.ounces
                                      ? 'oz'
                                      : '',
                        ),
                        controller: _carbsController,
                        keyboardType: const TextInputType.numberWithOptions(
                            decimal: true),
                      ),
                    ),
                TextFormField(
                  decoration: const InputDecoration(
                    labelText: 'Delayed Bolus Duration',
                    suffixText: ' min',
                  ),
                  controller: _delayController,
                  keyboardType: const TextInputType.numberWithOptions(),
                ),
                TextFormField(
                  controller: _notesController,
                  decoration: const InputDecoration(
                    labelText: 'Notes',
                    alignLabelWithHint: true,
                  ),
                  keyboardType: TextInputType.multiline,
                ),
              ],
            ),
          ],
        ),
      ),
      bottomNavigationBar: DetailBottomRow(
        onCancel: handleCancelAction,
        onSave: _isSaving ? null : handleSaveAction,
      ),
    );
  }
}