import 'package:diameter/components/detail.dart';
import 'package:diameter/components/dialogs.dart';
import 'package:diameter/config.dart';
import 'package:diameter/models/basal.dart';
import 'package:diameter/navigation.dart';
import 'package:diameter/screens/basal/basal_detail.dart';
import 'package:flutter/material.dart';
import 'package:diameter/components/forms.dart';
import 'package:diameter/models/basal_profile.dart';
import 'package:diameter/screens/basal/basal_list.dart';

class BasalProfileDetailScreen extends StatefulWidget {
  static const String routeName = '/basal-profile';

  final BasalProfile? basalProfile;
  final bool active;

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

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

class _BasalProfileDetailScreenState extends State<BasalProfileDetailScreen> {
  final GlobalKey<FormState> _basalProfileForm = GlobalKey<FormState>();

  late FloatingActionButton addBasalButton;
  late IconButton refreshButton;
  late IconButton closeButton;

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

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

    addBasalButton = FloatingActionButton(
      onPressed: () {
        Navigator.push(
          context,
          MaterialPageRoute(
            builder: (context) {
              return BasalDetailScreen(basalProfile: widget.basalProfile!);
            },
          ),
        ).then((message) => refresh(message: message));
      },
      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.basalProfile != null) {
        widget.basalProfile!.basalRates =
            Basal.fetchAllForBasalProfile(widget.basalProfile!);
      }
    });
    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 BasalProfile.getActiveCount();
    bool isNew = widget.basalProfile == null;

    if (_active &&
        (_activeCount > 1 ||
            _activeCount == 1 && (isNew || !widget.basalProfile!.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 BasalProfile.setAllInactive();
        }
      });
    } else if (!_active &&
        ((isNew && _activeCount == 0) ||
            (_activeCount == 1 && widget.basalProfile!.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 handleSaveAction() async {
    if (_basalProfileForm.currentState!.validate()) {
      await checkActiveProfiles();
      bool isNew = widget.basalProfile == null;
      isNew
          ? await BasalProfile.save(
              name: _nameController.text,
              active: _active,
              notes: _notesController.text)
          : await BasalProfile.update(
              widget.basalProfile!.objectId!,
              name: _nameController.text,
              active: _active,
              notes: _notesController.text,
            );
      Navigator.pop(context, '${isNew ? 'New' : ''} Basal Profile saved');
    }
  }

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

    if (showConfirmationDialogOnCancel &&
            (isNew &&
                (_active ||
                    _nameController.text != '' ||
                    _notesController.text != '')) ||
        (!isNew &&
            (widget.basalProfile!.active != _active ||
                widget.basalProfile!.name != _nameController.text ||
                (widget.basalProfile!.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.basalProfile != null) {
      setState(() {
        switch (index) {
          case 1:
            actionButton = addBasalButton;
            appBarActions = [refreshButton, closeButton];
            break;
          default:
            actionButton = null;
            appBarActions = [closeButton];
        }
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    bool isNew = widget.basalProfile == 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: _basalProfileForm,
                  fields: [
                    TextFormField(
                      controller: _nameController,
                      decoration: const InputDecoration(
                        labelText: 'Name',
                      ),
                      validator: (value) {
                        if (value!.trim().isEmpty) {
                          return 'Empty title';
                        }
                        return null;
                      },
                    ),
                    TextFormField(
                      keyboardType: TextInputType.multiline,
                      controller: _notesController,
                      decoration: const InputDecoration(
                        labelText: 'Notes',
                        suffixText: '',
                        alignLabelWithHint: true,
                      ),
                    ),
                    StyledBooleanFormField(
                      value: _active,
                      onChanged: (value) {
                        setState(() {
                          _active = value;
                        });
                      },
                      label: 'active',
                    ),
                  ],
                ),
              ],
            ),
          ),
        ];

        if (!isNew) {
          tabs.add(BasalListScreen(basalProfile: widget.basalProfile));
        }

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