info_tren/lib/models/train_data.dart

// To parse this JSON data, do
//
//     final trainData = trainDataFromJson(jsonString);

import 'dart:convert';

import 'package:freezed_annotation/freezed_annotation.dart';

part 'train_data.freezed.dart';
part 'train_data.g.dart';

TrainData trainDataFromJson(String str) => TrainData.fromJson(json.decode(str));

String trainDataToJson(TrainData data) => json.encode(data.toJson());

/// Results of scrapping InfoFer website for train info
@freezed
class TrainData with _$TrainData {
  const TrainData._();
  
  const factory TrainData({
    required String rank,
    required String number,
    required String date,
    required String operator,
    required List<TrainDataGroup> groups,
  }) = _TrainData;

  factory TrainData.fromJson(Map<String, dynamic> json) => _$TrainDataFromJson(json);
  
  TrainDataGroup get idealGroup {
    var result = groups.first;
    
    for (final group in groups) {
      if (result.stations.map((s) => s.linkName).toSet().difference(group.stations.map((s) => s.linkName).toSet()).isEmpty) {
        result = group;
      }
    }

    return result;
  }
  
  List<TrainDataStation> get stations => idealGroup.stations;
  TrainDataRoute get route => idealGroup.route;
  TrainDataStatus? get status => idealGroup.status;
}

@freezed
class TrainDataGroup with _$TrainDataGroup {
  const factory TrainDataGroup({
    required TrainDataRoute route,
    required List<TrainDataStation> stations,
    TrainDataStatus? status,
  }) = _TrainDataGroup;
  
  factory TrainDataGroup.fromJson(Map<String, dynamic> json) => _$TrainDataGroupFromJson(json);
}

/// Route of the train
@freezed
class TrainDataRoute with _$TrainDataRoute {
  const factory TrainDataRoute({
    required String from,
    required String to,
  }) = _TrainDataRoute;

  factory TrainDataRoute.fromJson(Map<String, dynamic> json) => _$TrainDataRouteFromJson(json);
}

@freezed
class TrainDataStation with _$TrainDataStation {
  const factory TrainDataStation({
    required String name,
    required String linkName,
    required int km,
    int? stoppingTime,
    String? platform,
    StationArrDepTime? arrival,
    StationArrDepTime? departure,
    @TrainDataNoteConverter()
    required List<TrainDataNote> notes,
  }) = _TrainDataStation;

  factory TrainDataStation.fromJson(Map<String, dynamic> json) => _$TrainDataStationFromJson(json);
}

@freezed
class StationArrDepTime with _$StationArrDepTime {
  const factory StationArrDepTime({
    required DateTime scheduleTime,
    StationArrDepTimeStatus? status,
  }) = _StationArrDepTime;

  factory StationArrDepTime.fromJson(Map<String, dynamic> json) => _$StationArrDepTimeFromJson(json);
}

@freezed
class StationArrDepTimeStatus with _$StationArrDepTimeStatus {
  const factory StationArrDepTimeStatus({
    required int delay,
    required bool real,
    required bool cancelled,
  }) = _StationArrDepTimeStatus;

  factory StationArrDepTimeStatus.fromJson(Map<String, dynamic> json) => _$StationArrDepTimeStatusFromJson(json);
}

@freezed
class TrainDataStatus with _$TrainDataStatus {
  const TrainDataStatus._();

  const factory TrainDataStatus({
    required int delay,
    required String station,
    required TrainDataStatusState state,
  }) = _TrainDataStatus;

  factory TrainDataStatus.fromJson(Map<String, dynamic> json) => _$TrainDataStatusFromJson(json);

  @override
  String toString() {
    String result = '';
    if (delay == 0) {
      result += 'La timp';
    }
    else {
      result += '${delay.abs()} min';
    }
    result += ' la ';
    result += switch (state) {
      TrainDataStatusState.passing => 'trecerea fără oprire prin',
      TrainDataStatusState.arrival => 'sosirea în',
      TrainDataStatusState.departure => 'plecarea din',
    };
    result += station;
    return result;
  }
}

enum TrainDataStatusState { passing, arrival, departure }

abstract class TrainDataNote {
  final String kind;

  const TrainDataNote({required this.kind});

  Map<String, dynamic> toJson() => {
    "kind": kind,
  };
}

class TrainDataNoteConverter implements JsonConverter<TrainDataNote, Map<String, dynamic>> {
  const TrainDataNoteConverter();

  @override
  TrainDataNote fromJson(Map<String, dynamic> json) {
    return switch(json['kind']) {
      'trainNumberChange' => TrainDataNoteTrainNumberChange.fromJson(json),
      'departsAs' => TrainDataNoteDepartsAs.fromJson(json),
      'detachingWagons' => TrainDataNoteDetachingWagons.fromJson(json),
      'receivingWagons' => TrainDataNoteReceivingWagons.fromJson(json),
      _ => TrainDataNoteUnknown.fromJson(json),
    };
  }

  @override
  Map<String, dynamic> toJson(TrainDataNote object) {
    return object.toJson();
  }
}

@freezed
class TrainDataNoteTrainNumberChange with _$TrainDataNoteTrainNumberChange implements TrainDataNote {
  @Implements<TrainDataNote>()
  const factory TrainDataNoteTrainNumberChange({
    // base
    @Default("trainNumberChange")
    String kind,
    // impl
    required String rank,
    required String number,
  }) = _TrainDataNoteTrainNumberChange;  
  
  factory TrainDataNoteTrainNumberChange.fromJson(Map<String, dynamic> json) => _$TrainDataNoteTrainNumberChangeFromJson(json);
}

@freezed
class TrainDataNoteDepartsAs with _$TrainDataNoteDepartsAs implements TrainDataNote {
  @Implements<TrainDataNote>()
  const factory TrainDataNoteDepartsAs({
    // base
    @Default("departsAs")
    String kind,
    // impl
    required String rank,
    required String number,
    required DateTime departureDate,
  }) = _TrainDataNoteDepartsAs;  
  
  factory TrainDataNoteDepartsAs.fromJson(Map<String, dynamic> json) => _$TrainDataNoteDepartsAsFromJson(json);
}

@freezed
class TrainDataNoteDetachingWagons with _$TrainDataNoteDetachingWagons implements TrainDataNote {
  @Implements<TrainDataNote>()
  const factory TrainDataNoteDetachingWagons({
    // base
    @Default("detachingWagons")
    String kind,
    // impl
    required String station,
  }) = _TrainDataNoteDetachingWagons;  
  
  factory TrainDataNoteDetachingWagons.fromJson(Map<String, dynamic> json) => _$TrainDataNoteDetachingWagonsFromJson(json);
}
@freezed
class TrainDataNoteReceivingWagons with _$TrainDataNoteReceivingWagons implements TrainDataNote {
  @Implements<TrainDataNote>()
  const factory TrainDataNoteReceivingWagons({
    // base
    @Default("receivingWagons")
    String kind,
    // impl
    required String station,
  }) = _TrainDataNoteReceivingWagons;  
  
  factory TrainDataNoteReceivingWagons.fromJson(Map<String, dynamic> json) => _$TrainDataNoteReceivingWagonsFromJson(json);
}
  
@freezed
class TrainDataNoteUnknown with _$TrainDataNoteUnknown implements TrainDataNote {
  @Implements<TrainDataNote>()
  const factory TrainDataNoteUnknown({
    // base
    required String kind,
    // impl
    required Map<String, dynamic> extra,
  }) = _TrainDataNoteUnknown;
  
  factory TrainDataNoteUnknown.fromJson(Map<String, dynamic> json) => TrainDataNoteUnknown(
    kind: json['kind'], 
    extra: Map.from(json)..remove('kind'),
  );
}