import 'dart:convert';

import 'package:shared_preferences/shared_preferences.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'],
      collectionName: json['collectionName'],
      description: json['description'],
    );
  }

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

class Device{
  int id;
  String urn;

  Device(this.id, this.urn);

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

  @override
  String toString(){
    return '{ ${this.id}, ${this.urn} }';
  }
}

class Event{
  int id;
  String urn;
  String label;
  String type;
  String description;
  String status;
  String startDate;
  String endDate;
  String latitude;
  String longitude;
  String elevation;

  Event(
      this.id,
      this.urn,
      this.label,
      this.type,
      this.description,
      this.status,
      this.startDate,
      this.endDate,
      [this.latitude = "",
      this.longitude = "",
      this.elevation = ""]
      );

  factory Event.fromJson(Map<String, dynamic> parsedJson){
    return Event( parsedJson['id'] as int,
      parsedJson['urn'] as String,
      parsedJson['label'] as String,
      parsedJson['type'] as String,
      parsedJson['description'] as String,
      parsedJson['status'] as String,
      parsedJson['startDate'] as String,
      parsedJson['endDate'] as String,
      "",
      "",
      "",
    );
  }

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

class EventType{
  int id;
  String name;

  EventType(
      this.id,
      this.name
      );

  factory EventType.fromJson(Map<String, dynamic> parsedJson){
    return EventType(parsedJson['id'] as int, parsedJson['generalName'] as String);
  }
}

class SensorLogin{
  String mail;
  String password;
  String token;

  SensorLogin(
      this.mail,
      this.password,
      this.token  //REST API access Token
      );

  String toJsonString() {
    return '{ "username": $mail, "authPassword": $password }';
  }

  Map<String, dynamic> toJson() => {
    "username": mail,
    "authPassword": 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('', '', '');

  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('', '', '');
  }
}

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(0, 'urn0', '', '', '', 'PENDING', '', '');
}

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

  factory EventStoreInstance() {
    return _instance;
  }

  EventStoreInstance._internal() {
    events = [];
    currentEvent = Event(0, 'urn0', '', '', '', 'PENDING', '', '');
  }

  void reset(){
    events = [];
    currentEvent = Event(0, 'urn0', '', '', '', 'PENDING', '', '');
  }
}