import 'package:hiddingsel_app/appflow/model/event_organisations.dart';
import 'package:hiddingsel_app/appflow/model/location.dart';

import '../constants/enums.dart';
import '../appflow/model/contacts.dart';
import '../appflow/model/event.dart';
import '../appflow/model/schedules.dart';

class IcalParser {
  static List<EventModel> parse(String data) {
    final regex = RegExp('BEGIN:VEVENT(.*?)END:VEVENT', dotAll: true);
    return regex
        .allMatches(data)
        .map((e) => e.group(0))
        .map((e) => _parseToEvent(e!))
        .where((e) => e != null)
        .cast<EventModel>()
        .toList();
  }

  static EventModel? _parseToEvent(String data) {
    try {
      final cleandData = data.replaceAll('\n', '\r');
      final String id = RegExp('UID:(.*?)\\r').firstMatch(cleandData)!.group(1)!;
      final String summary =
          RegExp('SUMMARY.*?:(.*?)\\r').firstMatch(cleandData)!.group(1)!;
      final String dtStart =
          RegExp('DTSTART.*:(.*?)\\r').firstMatch(cleandData)!.group(1)!;
      final String dtEnd = RegExp('DTEND.*:(.*?)\\r').firstMatch(cleandData)!.group(1)!;
      final description =
          RegExp('DESCRIPTION:(.*?)\\r').firstMatch(cleandData)?.group(1);
      var location =
          RegExp('LOCATION:(.*?)\\r').firstMatch(cleandData)?.group(1)?.replaceAll('\\,', ',');
      final attendees =
          RegExp('ATTENDEE.*?CN=(.*?);', dotAll: true).allMatches(cleandData).map((e) => e.group(1)?.replaceAll('\r', '')
              .replaceAll('\n', '')
              .replaceAll(' ', '')).where((e) => e != null).cast<String>().toList();
      final freq = RegExp('RRULE.*?FREQ=(.*?);', dotAll: true)
          .firstMatch(cleandData)
          ?.group(1);
      final interval = RegExp('RRULE.*?INTERVAL=(.*?);', dotAll: true)
          .firstMatch(cleandData)
          ?.group(1);
      final until = RegExp('RRULE.*?UNTIL=(.*?);', dotAll: true)
          .firstMatch(cleandData)
          ?.group(1);
      final List<EventOrganisationModel> eventOrganizer;
      if(location!.contains('Brinkstraße')) {
        location = 'Hiddingsel';
        eventOrganizer = [EventOrganisationModel.fromId('garbage')!];
      } else {
        eventOrganizer = attendees.map((e) => fromAttendee(e)).where((e) => e != null).cast<EventOrganisationModel>().toList();
      }

      var freqKey = Frequency.once;
      if (freq == 'DAILY') {
        freqKey = Frequency.days;
      } else if (freq == 'WEEKLY') {
        freqKey = Frequency.weeks;
      } else if (freq == 'MONTHLY') {
        freqKey = Frequency.months;
      }

      return EventModel(id,
        ScheduleModel(
          _parse(dtStart),
          _parse(dtEnd),
          freqKey,
          interval != null ? _parseInt(interval) : 1,
            until != null ? _parse(until) : null
        ),
        summary,
        ContactModel(location: LocationModel(address: location)),
        description: description,
        eventOrganizer: eventOrganizer,
      );
    } catch (e) {
      return null;
    }
  }

  static DateTime _parse(String data) => DateTime.parse(data).toLocal();
  static int _parseInt(String data) => int.parse(data);


  static EventOrganisationModel? fromAttendee(String? attendee) {
    if(attendee == null) return null;
    switch (attendee) {
      case 'sportverein@hiddingsel.de':
        return EventOrganisationModel.fromId('svVorwaertsHiddingsel');
      case 'dorfgemeinschaft@hiddingsel.de':
        return EventOrganisationModel.fromId('dorfgemeinschaft');
      case 'dorfnews@hiddingsel.de':
        return EventOrganisationModel.fromId('dorfgemeinschaft');
      case 'schuetzenverein-hiddingsel@hiddingsel.de':
        return EventOrganisationModel.fromId('allgemeinerSchuetzenverein');
      case 'kolping@hiddingsel.de':
        return EventOrganisationModel.fromId('kolpingfamilieHiddingsel');
      case 'landjugend@hiddingsel.de':
        return EventOrganisationModel.fromId('landjugendHiddingsel');
      case 'feuerwehr@hiddingsel.de':
        return EventOrganisationModel.fromId('freiwilligeFeuerwehr');
      case 'kirche@hiddingsel.de':
        return EventOrganisationModel.fromId('stGeorgKirche');
      case 'kindergarten@hiddingsel.de':
        return EventOrganisationModel.fromId('kindergarten');
      case 'grundschule@hiddingsel.de':
        return EventOrganisationModel.fromId('grundschule');
      case 'landfrauen@hiddingsel.de':
        return EventOrganisationModel.fromId('landfrauen');
      case 'schuetzenverein-daldrup@hiddingsel.de':
        return EventOrganisationModel.fromId('daldruperSchuetzenverein');
      case 'landwirtschaftlicher-ortsverein@hiddingsel.de':
        return EventOrganisationModel.fromId('landwirtschaflicherOrtsverein');
      case 'drk@hiddingsel.de':
        return EventOrganisationModel.fromId('drk');
      case 'eltern-kind-gruppe@hiddingsel.de':
        return EventOrganisationModel.fromId('elternKindGruppe');
      case 'kfd@hiddingsel.de':
        return EventOrganisationModel.fromId('kfd');
      case 'kulturforum@hiddingsel.de':
        return EventOrganisationModel.fromId('kulturforum');
      case 'psg@hiddingsel.de':
        return EventOrganisationModel.fromId('pfadfinderinnenschaftStGeorg');
      case 'seniorengemeinschaft@hiddingsel.de':
        return EventOrganisationModel.fromId('seniorengemeinschaft');
      case 'voices@hiddingsel.de':
        return EventOrganisationModel.fromId('voices');
      case 'aida@hiddingsel.de':
        return EventOrganisationModel.fromId('aktivInDasAlter');
      case 'foerderverein-kiga-schule@hiddingsel.de':
        return EventOrganisationModel.fromId('foerdervereinKigaSchu');
      case 'buecherei@hiddingsel.de':
        return EventOrganisationModel.fromId('buecherei');
      case 'jaegerzug@hiddingsel.de':
        return EventOrganisationModel.fromId('jaegerzug');
      case 'cdu@hiddingsel.de':
        return EventOrganisationModel.fromId('cdu');
      default:
        return null;
    }
  }
}