import 'package:diameter/components/detail.dart';
import 'package:diameter/components/dialogs.dart';
import 'package:diameter/config.dart';
import 'package:diameter/models/bolus.dart';
import 'package:diameter/navigation.dart';
import 'package:diameter/screens/bolus/bolus_detail.dart';
import 'package:flutter/material.dart';
import 'package:diameter/components/forms.dart';
import 'package:diameter/models/bolus_profile.dart';
import 'package:diameter/screens/bolus/bolus_list.dart';

class BolusProfileDetailScreen extends StatefulWidget {
  static const String routeName = '/bolus-profile';

  final BolusProfile? bolusProfile;
  final bool active;

  const BolusProfileDetailScreen(
      {Key? key, this.active = false, this.bolusProfile})
      : super(key: key);

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

class _BolusProfileDetailScreenState extends State<BolusProfileDetailScreen> {
  final GlobalKey<FormState> _bolusProfileForm = GlobalKey<FormState>();

  late FloatingActionButton addBolusButton;
  late IconButton refreshButton;
  late IconButton closeButton;

  final _nameController = TextEditingController(text: '');
  final _notesController = TextEditingController(text: '');
  bool _active = false;

  @override
  void initState() {
    super.initState();
    if (widget.bolusProfile != null) {
      _nameController.text = widget.bolusProfile!.name;
      _active = widget.bolusProfile!.active;
      _notesController.text = widget.bolusProfile!.notes ?? '';
    }
    if (widget.active) {
      _active = true;
    }

    addBolusButton = FloatingActionButton(
      onPressed: handleAddNew,
      child: const Icon(Icons.add),
    );

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

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

    actionButton = null;
    appBarActions = [closeButton];
  }

  void refresh({String? message}) {
    setState(() {
      if (widget.bolusProfile != null) {
        widget.bolusProfile!.bolusRates =
            Bolus.fetchAllForBolusProfile(widget.bolusProfile!);
      }
    });
    setState(() {
      if (message != null) {
        var snackBar = SnackBar(
          content: Text(message),
          duration: const Duration(seconds: 2),
        );
        ScaffoldMessenger.of(context)
          ..removeCurrentSnackBar()
          ..showSnackBar(snackBar);
      }
    });
  }

  Future<void> checkActiveProfiles() async {
    int _activeCount = await BolusProfile.getActiveCount();
    bool isNew = widget.bolusProfile == null;

    if (_active &&
        (_activeCount > 1 ||
            _activeCount == 1 && (isNew || !widget.bolusProfile!.active))) {
      await showDialog(
          context: context,
          builder: (BuildContext context) {
            return AlertDialog(
              content: const Text(
                  'There are already one or more active profiles. What would you like to do?'),
              actions: [
                TextButton(
                  onPressed: () => Navigator.pop(context, 0),
                  child: const Text('IGNORE'),
                ),
                TextButton(
                  onPressed: () => Navigator.pop(context, 1),
                  child:
                      Text('DEACTIVATE ${_nameController.text.toUpperCase()}'),
                ),
                ElevatedButton(
                  onPressed: () => Navigator.pop(context, 2),
                  child: const Text('DEACTIVATE ALL OTHERS'),
                )
              ],
            );
          }).then((value) async {
        if (value == 1) {
          setState(() {
            _active = false;
          });
        } else if (value == 2) {
          await BolusProfile.setAllInactive();
        }
      });
    } else if (!_active &&
        ((isNew && _activeCount == 0) ||
            (_activeCount == 1 && widget.bolusProfile!.active))) {
      await showDialog(
          context: context,
          builder: (BuildContext context) {
            return AlertDialog(
              content: const Text(
                  'There is currently no active profile. Would you like to set this one as active?'),
              actions: [
                TextButton(
                  onPressed: () => Navigator.pop(context, 0),
                  child: const Text('IGNORE'),
                ),
                TextButton(
                  onPressed: () => Navigator.pop(context, 1),
                  child: const Text('ACTIVATE THIS PROFILE'),
                ),
              ],
            );
          }).then((value) {
        if (value == 1) {
          setState(() {
            _active = true;
          });
        }
      });
    }
  }

  void handleAddNew() async {
    List<Bolus> bolusRates =
        await Bolus.fetchAllForBolusProfile(widget.bolusProfile!);
    TimeOfDay? suggestedStartTime;
    TimeOfDay? suggestedEndTime;

    bolusRates.asMap().forEach((index, bolus) {
      if (suggestedStartTime == null && suggestedEndTime == null) {
        if (index == 0 &&
            (bolus.startTime.hour != 0 || bolus.startTime.minute != 0)) {
          suggestedStartTime = const TimeOfDay(hour: 0, minute: 0);
          suggestedEndTime = TimeOfDay.fromDateTime(bolus.startTime);
        } else if ((index == bolusRates.length - 1) &&
            (bolus.endTime.hour != 0 || bolus.endTime.minute != 0)) {
          suggestedStartTime = TimeOfDay.fromDateTime(bolus.endTime);
          suggestedEndTime = const TimeOfDay(hour: 0, minute: 0);
        } else if (index != 0) {
          var lastEndTime = bolusRates[index - 1].endTime;
          if (bolus.startTime.isAfter(lastEndTime)) {
            suggestedStartTime = TimeOfDay.fromDateTime(lastEndTime);
            suggestedEndTime = TimeOfDay.fromDateTime(bolus.startTime);
          }
        }
      }
    });

    Navigator.push(
      context,
      MaterialPageRoute(
        builder: (context) {
          return BolusDetailScreen(
            bolusProfile: widget.bolusProfile!,
            suggestedStartTime: suggestedStartTime,
            suggestedEndTime: suggestedEndTime,
          );
        },
      ),
    ).then((message) => refresh(message: message));
  }

  void handleSaveAction() async {
    if (_bolusProfileForm.currentState!.validate()) {
      await checkActiveProfiles();
      bool isNew = widget.bolusProfile == null;
      isNew
          ? await BolusProfile.save(
              name: _nameController.text,
              active: _active,
              notes: _notesController.text)
          : await BolusProfile.update(
              widget.bolusProfile!.objectId!,
              name: _nameController.text,
              active: _active,
              notes: _notesController.text,
            );
      Navigator.pop(context, '${isNew ? 'New' : ''} Bolus Profile saved');
    }
  }

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

    if (showConfirmationDialogOnCancel &&
            (isNew &&
                (_active != widget.active ||
                    _nameController.text != '' ||
                    _notesController.text != '')) ||
        (!isNew &&
            (widget.bolusProfile!.active != _active ||
                widget.bolusProfile!.name != _nameController.text ||
                (widget.bolusProfile!.notes ?? '') != _notesController.text))) {
      Dialogs.showCancelConfirmationDialog(
        context: context,
        isNew: isNew,
        onSave: handleSaveAction,
      );
    } else {
      Navigator.pop(context);
    }
  }

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

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

  @override
  Widget build(BuildContext context) {
    bool isNew = widget.bolusProfile == null;
    return DefaultTabController(
      length: isNew ? 1 : 2,
      child: Builder(builder: (BuildContext context) {
        final TabController tabController = DefaultTabController.of(context)!;
        tabController.addListener(() {
          if (tabController.indexIsChanging) {
            renderTabButtons(tabController.index);
          }
        });

        List<Widget> tabs = [
          SingleChildScrollView(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: [
                StyledForm(
                  formState: _bolusProfileForm,
                  fields: [
                    TextFormField(
                      controller: _nameController,
                      decoration: const InputDecoration(
                        labelText: 'Name',
                      ),
                      validator: (value) {
                        if (value!.trim().isEmpty) {
                          return 'Empty title';
                        }
                        return null;
                      },
                    ),
                    TextFormField(
                      decoration: const InputDecoration(
                        labelText: 'Notes',
                        alignLabelWithHint: true,
                      ),
                      controller: _notesController,
                      keyboardType: TextInputType.multiline,
                    ),
                    StyledBooleanFormField(
                      value: _active,
                      onChanged: (value) {
                        setState(() {
                          _active = value;
                        });
                      },
                      label: 'active',
                    ),
                  ],
                ),
              ],
            ),
          ),
        ];

        if (!isNew) {
          tabs.add(BolusListScreen(bolusProfile: widget.bolusProfile));
        }

        return Scaffold(
          appBar: AppBar(
            title:
                Text(isNew ? 'New Bolus Profile' : widget.bolusProfile!.name),
            bottom: isNew
                ? PreferredSize(child: Container(), preferredSize: Size.zero)
                : const TabBar(
                    tabs: [
                      Tab(text: 'PROFILE'),
                      Tab(text: 'RATES'),
                    ],
                  ),
            actions: appBarActions,
          ),
          drawer: const Navigation(
              currentLocation: BolusProfileDetailScreen.routeName),
          body: TabBarView(
            children: tabs,
          ),
          bottomNavigationBar: DetailBottomRow(
            onCancel: handleCancelAction,
            onSave: handleSaveAction,
          ),
          floatingActionButton: actionButton,
          floatingActionButtonLocation:
              FloatingActionButtonLocation.centerDocked,
        );
      }),
    );
  }
}