import 'package:diameter/components/dialogs.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/models/settings.dart';
import 'package:diameter/navigation.dart';
import 'package:diameter/screens/log/log_entry/log_entry.dart';
import 'package:diameter/utils/date_time_utils.dart';
import 'package:flutter/material.dart';

class LogScreen extends StatefulWidget {
  static const String routeName = '/log';
  const LogScreen({Key? key}) : super(key: key);

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

class _LogScreenState extends State<LogScreen> {
  late Map<DateTime, List<LogEntry>> _logEntryDailyMap;

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

  void reload({String? message}) {
    setState(() {
      _logEntryDailyMap = LogEntry.getDailyEntryMap();
    });
    setState(() {
      if (message != null) {
        var snackBar = SnackBar(
          content: Text(message),
          duration: const Duration(seconds: 2),
        );
        ScaffoldMessenger.of(context)
          ..removeCurrentSnackBar()
          ..showSnackBar(snackBar);
      }
    });
  }

  void onDelete(LogEntry logEntry) {
    LogEntry.remove(logEntry.id);
    reload(message: 'Log Entry deleted');
  }

  void handleDeleteAction(LogEntry logEntry) async {
    if (Settings.get().showConfirmationDialogOnDelete) {
      Dialogs.showConfirmationDialog(
        context: context,
        onConfirm: () => onDelete(logEntry),
        message: 'Are you sure you want to delete this Log Entry?',
      );
    } else {
      onDelete(logEntry);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Log Entries'),
        actions: <Widget>[
          IconButton(onPressed: reload, icon: const Icon(Icons.refresh)),
        ],
      ),
      drawer: const Navigation(currentLocation: LogScreen.routeName),
      body: Column(
        children: [
          Expanded(
            child: _logEntryDailyMap.isNotEmpty
                ? ListView.builder(
                    padding: const EdgeInsets.all(10.0),
                    shrinkWrap: true,
                    itemCount: _logEntryDailyMap.length,
                    itemBuilder: (context, dateIndex) {
                      List<DateTime> dateList = _logEntryDailyMap.keys.toList();
                      final date = dateList[dateIndex];
                      final entryList = _logEntryDailyMap[date];
                      final tiles = <Widget>[];
                      for (LogEntry logEntry in entryList!) {
                        double bolus =
                            LogBolus.getTotalBolusForEntry(logEntry.id);
                        double carbs =
                            LogMeal.getTotalCarbsForEntry(logEntry.id);
                        tiles.add(ListTile(
                          onTap: () {
                            Navigator.push(
                              context,
                              MaterialPageRoute(
                                builder: (context) =>
                                    LogEntryScreen(id: logEntry.id),
                              ),
                            ).then((message) => reload(message: message));
                          },
                          title: Row(
                            mainAxisAlignment: MainAxisAlignment.start,
                            crossAxisAlignment: CrossAxisAlignment.start,
                            children: [
                              Expanded(
                                child: Text(
                                  DateTimeUtils.displayTime(logEntry.time),
                                ),
                              ),
                              Expanded(
                                child: Column(
                                  children: logEntry.mgPerDl != null &&
                                          (Settings.glucoseMeasurement ==
                                                  GlucoseMeasurement.mgPerDl ||
                                              Settings.glucoseDisplayMode ==
                                                  GlucoseDisplayMode.both ||
                                              Settings.glucoseDisplayMode ==
                                                  GlucoseDisplayMode
                                                      .bothForList)
                                      ? [
                                          Text(logEntry.mgPerDl.toString()),
                                          const Text(
                                            'mg/dl',
                                            textScaleFactor: 0.75,
                                          ),
                                        ]
                                      : [],
                                ),
                              ),
                              Expanded(
                                child: Column(
                                  children: logEntry.mmolPerL != null &&
                                          (Settings.glucoseMeasurement ==
                                                  GlucoseMeasurement.mmolPerL ||
                                              Settings.glucoseDisplayMode ==
                                                  GlucoseDisplayMode.both ||
                                              Settings.glucoseDisplayMode ==
                                                  GlucoseDisplayMode
                                                      .bothForList)
                                      ? [
                                          Text(logEntry.mmolPerL.toString()),
                                          const Text(
                                            'mmol/l',
                                            textScaleFactor: 0.75,
                                          ),
                                        ]
                                      : [],
                                ),
                              ),
                              Expanded(
                                child: Column(
                                  children: (bolus > 0)
                                      ? [
                                          Text(bolus.toStringAsPrecision(3)),
                                          const Text('U',
                                              textScaleFactor: 0.75),
                                        ]
                                      : [],
                                ),
                              ),
                              Expanded(
                                child: Column(
                                  children: (carbs > 0)
                                      ? [
                                          Text(carbs.toStringAsPrecision(3)),
                                          Text(
                                            Settings.nutritionMeasurementSuffix,
                                            textScaleFactor: 0.75),
                                        ]
                                      : [],
                                ),
                              ),
                            ],
                          ),
                          trailing: Row(
                            mainAxisSize: MainAxisSize.min,
                            children: [
                              IconButton(
                                onPressed: () => handleDeleteAction(logEntry),
                                icon: const Icon(Icons.delete,
                                    color: Colors.blue),
                              )
                            ],
                          ),
                        ));
                        
                      }
                      return ListBody(
                          children: <Widget>[Text(DateTimeUtils.displayDate(date))] + tiles,
                        );
                    },

                  )
                : const Center(
                    child: Text('You have not created any Log Entries yet!'),
                  ),
          ),
        ],
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          Navigator.push(
            context,
            MaterialPageRoute(
              builder: (context) => const LogEntryScreen(),
            ),
          ).then((message) => reload(message: message));
        },
        child: const Icon(Icons.add),
      ),
    );
  }
}