datamodel.dart

class Collection {
  int id;
  String description;
  String collectionName;

  Collection({
    required this.id,
    required this.description,
    required this.collectionName,
  });

  factory Collection.fromJson(Map<String, dynamic> json) {
    return Collection(
      id: json['id'],
      description: json['description'],
      collectionName: json['collectionName'],
    );
  }

  Map<String, dynamic> toJson() => {
    'id': id,
    'description': description,
    'collectionName' : collectionName
  };

  @override
  String toString(){
    return collectionName;
  }
}

class Device{
  int id;
  String urn;

  Device(this.id, this.urn);

  factory Device.fromJson(Map<String, dynamic> json){
    return Device( json['id'] as int,
        json['urn'] as String);
  }

  Map<String, dynamic> toJson() => {
    'id': id,
    'urn': urn
  };

  @override
  String toString(){
    return urn;
  }
}


class Event{
  int id;  // Device URN id
  String urn;
  String label;
  String type; // Event type name  TODO: this should be an EventType variable
  int typeId;
  String description;
  String status;
  String startDate;
  String endDate;
  String latitude;
  String longitude;
  String elevation;

  Event({
    required this.id,
    required this.urn,
    required this.label,
    required this.type,
    required this.typeId,
    required this.description,
    required this.status,
    required this.startDate,
    required this.endDate,
    required this.latitude,
    required this.longitude,
    required this.elevation,
  });

  factory Event.fromJson(Map<String, dynamic> json){
    return Event(
      id: json['id'],
      urn: json['urn'],
      label: json['label'],
      type: json['type'],
      typeId: json['typeId'],
      description: json['description'],
      status: json['status'],
      startDate: json['startDate'],
      endDate: json['endDate'],
      latitude: json['latitude'],
      longitude: json['longitude'],
      elevation: json['elevation'],
    );
  }

  Map<String, dynamic> toJson() => {
    'id': id,
    'urn': urn,
    'label': label,
    'type' : type,
    'typeId' : typeId,
    'description' : description,
    'status' : status,
    'startDate' : startDate,
    'endDate' : endDate,
    'latitude' : latitude,
    'longitude' : longitude,
    'elevation' : elevation
  };

  Map<String, dynamic> toSensorJson() {
    return {
      "\"itemID\"":"\"$id\"",
      "\"inheritToAllChildren\"":"\"false\"",
      "\"inheritToChildren\"":[],
      "\"event\"":{
        "\"startDate\"":"\"$startDate\"",
        "\"endDate\"":"\"$endDate\"",
        "\"label\"":"\"$label\"",
        "\"description\"":"\"$description\"",
        "\"eventType\"":"\"$typeId\"",
        "\"latitude\"":"\"$latitude\"",
        "\"longitude\"":"\"$longitude\"",
        "\"elevationInMeter\"":"\"$elevation\"",
        "\"id\"":"\"0\""
      }
    };
  }

  @override
  String toString(){
    return '{ ${this.id}, '
        '${this.urn}, '
        '${this.label}, '
        '${this.type}, '
        '${this.description}, '
        '${this.startDate}, '
        '${this.endDate}, '
        '${this.latitude},'
        '${this.longitude},'
        '${this.elevation},'
        '${this.status} }';
  }
}


class EventType{
  int id;
  String name;

  EventType({
    required this.id,
    required this.name
  });

  EventType.fromSensorJson(Map<String, dynamic> json)
      :   id = json['id'],
          name = json['generalName'];

  EventType.fromJson(Map<String, dynamic> json)
      : id = json['id'],
        name = json['name'];

  Map<String, dynamic> toJson() => {
    'id': id,
    'name': name,
  };

  @override
  String toString(){
    return name;
  }
}


class SensorLogin{
  String mail;
  String password;

  SensorLogin(
      this.mail,
      this.password,
      );

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

  SensorLogin.fromJson(Map<String, dynamic> json)
      : mail = json['mail'],
        password = json['password'];
}


// Storage classes
// ConfigurationStoreBase for Collection, devices, event types, login information
// EventStoreBase for created event information.
abstract class ConfigurationStoreBase {
  List<Collection> collections = [];
  Collection currentCollection = Collection(id: -1, description: '', collectionName: '');
  List<Device> devices = [];
  List<EventType> eventTypes = [];
  SensorLogin loginInformation = SensorLogin('', '');
  bool initialized = false;

  Collection getCollectionFromName(String name) {
    for (var collection in collections) {
      if (collection.collectionName == name) {
        return collection;
      }
    }
    throw Exception('Event with name :' + name + ' was not found.');
  }

  int getDeviceIdFromUrn(String urn) {
    for (var device in devices) {
      if (device.urn == urn) {
        return device.id;
      }
    }
    throw Exception('Device with urn:' + urn + ' was not found.');
  }

  int getEventIdFromName(String name) {
    for (var eventType in eventTypes) {
      if (eventType.name == name) {
        return eventType.id;
      }
    }
    throw Exception('Event with name :' + name + ' was not found.');
  }

  void reset(){
    collections = [];
    devices = [];
    eventTypes = [];
    currentCollection = Collection(id: -1, description: '', collectionName: '');
    loginInformation = SensorLogin('admin', 'adminadmin');
    initialized = false;
  }
}


class ConfigurationStoreInstance extends ConfigurationStoreBase {
  static final ConfigurationStoreInstance _instance = ConfigurationStoreInstance
      ._internal();

  factory ConfigurationStoreInstance() {
    return _instance;
  }

  ConfigurationStoreInstance._internal() {
    collections = [];
    devices = [];
    eventTypes = [];
  }
}


abstract class EventStoreBase{
  List<Event> events = [];
  Event currentEvent = Event(
      id:-1,
      urn:'urn0',
      label:'',
      type:'',
      typeId:-1,
      description:'',
      status:'PENDING',
      startDate:'',
      endDate: '',
      latitude: '',
      longitude: '',
      elevation: ''
  );

  int getPendingEventCount(){
    int count = 0;
    for (var event in events) {
      if (event.status == 'PENDING') {
        count++;
      }
    }
    return count;
  }
}


class EventStoreInstance extends EventStoreBase {
  static final EventStoreInstance _instance = EventStoreInstance._internal();

  factory EventStoreInstance() {
    return _instance;
  }

  EventStoreInstance._internal() {
    events = [];
    currentEvent = Event(
        id:-1,
        urn:'urn0',
        label:'',
        type:'',
        typeId:-1,
        description:'',
        status:'PENDING',
        startDate:'',
        endDate: '',
        latitude: '',
        longitude: '',
        elevation: ''
    );;
  }

  void reset(){
    events = [];
    currentEvent = Event(
        id:-1,
        urn:'urn0',
        label:'',
        type:'',
        typeId:-1,
        description:'',
        status:'PENDING',
        startDate:'',
        endDate: '',
        latitude: '',
        longitude: '',
        elevation: ''
    );
  }
}