import 'package:diameter/components/detail.dart';
import 'package:diameter/components/dialogs.dart';
import 'package:diameter/config.dart';
import 'package:diameter/models/log_entry.dart';
import 'package:diameter/models/log_event.dart';
import 'package:diameter/models/log_meal.dart';
import 'package:diameter/navigation.dart';
import 'package:diameter/screens/log/log_entry_form.dart';
import 'package:diameter/screens/log/log_event_detail.dart';
import 'package:diameter/screens/log/log_event_list.dart';
import 'package:diameter/screens/log/log_meal_detail.dart';
import 'package:diameter/screens/log/log_meal_list.dart';
import 'package:flutter/material.dart';

class LogEntryScreen extends StatefulWidget {
  static const String routeName = '/log-entry';
  final LogEntry? entry;
  const LogEntryScreen({Key? key, this.entry}) : super(key: key);

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

class _LogEntryScreenState extends State<LogEntryScreen> {
  final GlobalKey<FormState> logEntryForm = GlobalKey<FormState>();

  late FloatingActionButton addMealButton;
  late FloatingActionButton addEventButton;
  late IconButton refreshButton;
  late IconButton closeButton;

  static FloatingActionButton? actionButton;
  static List<Widget> appBarActions = [];

  final formDataControllers = <String, TextEditingController>{
    'time': TextEditingController(text: ''),
    'mgPerDl': TextEditingController(text: ''),
    'mmolPerL': TextEditingController(text: ''),
    'bolusGlucose': TextEditingController(text: ''),
    'delayedBolusRate': TextEditingController(text: ''),
    'delayedBolusDuration': TextEditingController(text: ''),
    'notes': TextEditingController(text: ''),
  };

  void refreshLists({String? message}) {
    if (widget.entry != null) {
      setState(() {
        widget.entry!.meals = LogMeal.fetchAllForLogEntry(widget.entry!);
        widget.entry!.events = LogEvent.fetchAllForLogEntry(widget.entry!);
        widget.entry!.endedEvents =
            LogEvent.fetchAllEndedByEntry(widget.entry!);
      });
    }
  }

  void handleSaveAction() async {
    if (logEntryForm.currentState!.validate()) {
      bool isNew = widget.entry == null;
      isNew
          ? await LogEntry.save(
              time: DateTime.parse(formDataControllers['time']!.text),
              mgPerDl: int.tryParse(formDataControllers['mgPerDl']!.text),
              mmolPerL: double.tryParse(formDataControllers['mmolPerL']!.text),
              bolusGlucose:
                  double.tryParse(formDataControllers['bolusGlucose']!.text),
              delayedBolusDuration: int.tryParse(
                  formDataControllers['delayedBolusDuration']!.text),
              delayedBolusRatio: double.tryParse(
                  formDataControllers['delayedBolusRate']!.text),
              notes: formDataControllers['notes']!.text,
            )
          : await LogEntry.update(
              widget.entry!.objectId!,
              time: DateTime.parse(formDataControllers['time']!.text),
              mgPerDl: int.tryParse(formDataControllers['mgPerDl']!.text),
              mmolPerL: double.tryParse(formDataControllers['mmolPerL']!.text),
              bolusGlucose: double.tryParse(
                  formDataControllers['delayedBolusRate']!.text),
              delayedBolusDuration: int.tryParse(
                  formDataControllers['delayedBolusDuration']!.text),
              delayedBolusRatio: double.tryParse(
                  formDataControllers['delayedBolusRate']!.text),
              notes: formDataControllers['notes']!.text,
            );
      Navigator.pushReplacementNamed(context, '/log',
          arguments: '${isNew ? 'New' : ''} Log Entry Saved');
    }
  }

  void handleCancelAction() {
    bool isNew = widget.entry == null;
    if (showConfirmationDialogOnCancel &&
        ((isNew &&
                (int.tryParse(formDataControllers['mgPerDl']?.text ?? '') !=
                        null ||
                    double.tryParse(formDataControllers['mmolPerL']?.text ?? '') !=
                        null ||
                    double.tryParse(formDataControllers['bolusGlucose']?.text ?? '') !=
                        null ||
                    int.tryParse(formDataControllers['delayedBolusDuration']?.text ?? '') !=
                        null ||
                    double.tryParse(formDataControllers['delayedBolusRate']?.text ?? '') !=
                        null ||
                    formDataControllers['notes']?.text != '')) ||
            (!isNew &&
                (int.tryParse(formDataControllers['mgPerDl']?.text ?? '') !=
                        widget.entry!.mgPerDl ||
                    double.tryParse(formDataControllers['mmolPerL']?.text ?? '') !=
                        widget.entry!.mmolPerL ||
                    double.tryParse(formDataControllers['bolusGlucose']?.text ?? '') !=
                        widget.entry!.bolusGlucose ||
                    int.tryParse(
                            formDataControllers['delayedBolusDuration']?.text ??
                                '') !=
                        widget.entry!.delayedBolusDuration ||
                    double.tryParse(formDataControllers['delayedBolusRate']?.text ?? '') !=
                        widget.entry!.delayedBolusRatio ||
                    formDataControllers['notes']?.text !=
                        (widget.entry!.notes ?? ''))))) {
      Dialogs.showCancelConfirmationDialog(
        context: context,
        isNew: isNew,
        onSave: handleSaveAction,
        onDiscard: (context) => Navigator.pushReplacementNamed(context, '/log'),
      );
    } else {
      Navigator.pushReplacementNamed(context, '/log',
          arguments: '${isNew ? 'New' : ''} Log Entry Saved');
    }
  }

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

    if (widget.entry != null) {
      formDataControllers['time']!.text = widget.entry!.time.toString();
      formDataControllers['mgPerDl']!.text =
          (widget.entry!.mgPerDl ?? '').toString();
      formDataControllers['mmolPerL']!.text =
          (widget.entry!.mmolPerL ?? '').toString();
      formDataControllers['bolusGlucose']!.text =
          (widget.entry!.bolusGlucose ?? '').toString();
      formDataControllers['delayedBolusRate']!.text =
          (widget.entry!.delayedBolusRatio ?? '').toString();
      formDataControllers['delayedBolusDuration']!.text =
          (widget.entry!.delayedBolusDuration ?? '').toString();
      formDataControllers['notes']!.text = widget.entry!.notes ?? '';
    } else {
      formDataControllers['time']!.text = DateTime.now().toString();
    }

    addMealButton = FloatingActionButton(
      onPressed: () {
        Navigator.push(
          context,
          MaterialPageRoute(
            builder: (context) {
              return LogMealDetailScreen(logEntry: widget.entry!);
            },
          ),
        ).then((message) => refreshLists(message: message));
      },
      child: const Icon(Icons.add),
    );

    addEventButton = FloatingActionButton(
      onPressed: () {
        Navigator.push(
          context,
          MaterialPageRoute(
            builder: (context) {
              return LogEventDetailScreen(logEntry: widget.entry!);
            },
          ),
        ).then((message) => refreshLists(message: message));
      },
      child: const Icon(Icons.add),
    );

    refreshButton = IconButton(
      icon: const Icon(Icons.refresh),
      onPressed: refreshLists,
    );

    closeButton = IconButton(
      onPressed: handleCancelAction,
      icon: const Icon(Icons.close),
    );

    actionButton = null;
    appBarActions = [closeButton];
  }

  void renderTabButtons(index) {
    if (widget.entry != null) {
      setState(() {
        switch (index) {
          case 1:
            actionButton = addMealButton;
            appBarActions = [refreshButton, closeButton];
            break;
          case 2:
            actionButton = addEventButton;
            appBarActions = [refreshButton, closeButton];
            break;
          default:
            actionButton = null;
            appBarActions = [closeButton];
        }
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    bool isNew = widget.entry == null;

    return DefaultTabController(
      length: 3,
      child: Builder(builder: (BuildContext context) {
        final TabController tabController = DefaultTabController.of(context)!;
        tabController.addListener(() {
          if (tabController.indexIsChanging) {
            renderTabButtons(tabController.index);
          }
        });
        return Scaffold(
          appBar: AppBar(
            title: Text(isNew ? 'New Log Entry' : 'Edit Log Entry'),
            bottom: isNew
                ? PreferredSize(child: Container(), preferredSize: Size.zero)
                : const TabBar(
                    tabs: [
                      Tab(text: 'GENERAL'),
                      Tab(text: 'MEALS'),
                      Tab(text: 'EVENTS'),
                    ],
                  ),
            actions: appBarActions,
          ),
          drawer: const Navigation(currentLocation: LogEntryScreen.routeName),
          body: TabBarView(
            children: [
              LogEntryForm(
                  formState: logEntryForm, controllers: formDataControllers),
              LogMealListScreen(logEntry: widget.entry),
              LogEventListScreen(logEntry: widget.entry),
            ],
          ),
          bottomNavigationBar: DetailBottomRow(
            onCancel: handleCancelAction,
            onSave: handleSaveAction,
          ),
          floatingActionButton: actionButton,
          floatingActionButtonLocation:
              FloatingActionButtonLocation.centerDocked,
        );
      }),
    );
  }
}