import 'dart:convert';
import 'package:flutter/cupertino.dart';
import 'package:flutter/services.dart';
import 'package:flutter_secure_storage/flutter_secure_storage.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:package_info_plus/package_info_plus.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 + ' ' + id.toString() + ' ' + description;
  }
}

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;  //This shall be the mysql primary key database id
  int urnId;
  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.urnId,
    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.fromEvent(Event event){
    return Event(
      id: event.id,
      urnId: event.urnId,
      urn: event.urn,
      label: event.label,
      type: event.type,
      typeId: event.typeId,
      description: event.description,
      status: event.status,
      startDate: event.startDate,
      endDate: event.endDate,
      latitude: event.latitude,
      longitude: event.longitude,
      elevation: event.elevation,
    );
  }

  factory Event.fromJson(Map<String, dynamic> json){
    return Event(
      id: json['id'],
      urnId: json['urnId'],
      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> toMap() {
    return {
      'id' : id,
      'urnId': urnId,
      '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> toMapNoId() {
    return {
      'urnId': urnId,
      '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> toJson() => {
    'id' : id,
    'urnId': urnId,
    '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\"":"\"$urnId\"",
      "\"inheritToAllChildren\"":"\"false\"",
      "\"inheritToChildren\"":[],
      "\"event\"":{
        "\"startDate\"":"\"$startDate\"",
        "\"endDate\"":"\"$endDate\"",
        "\"label\"":"\"$label\"",
        "\"description\"":"\"$description\"",
        "\"eventType\"":"\"$typeId\"",
        "\"latitude\"":"\"$latitude\"",
        "\"longitude\"":"\"$longitude\"",
        "\"elevationInMeter\"":"\"$elevation\"",
        "\"id\"":"\"0\""
      }
    };
  }

  @override
  String toString(){
    return '{ '
        '${this.id}, '
        '${this.urnId}, '
        '${this.urn}, '
        '${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 LabelConfiguration{
  int cnt;
  String prefix;

  LabelConfiguration(
    this.cnt,
    this.prefix
  );

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

  LabelConfiguration.fromJson(Map<String, dynamic> json)
      : prefix = json['prefix'],
        cnt = json['cnt'];
}

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('', '');
  LabelConfiguration labelConfig = LabelConfiguration(0, '');
  String restRequestUrl = '';
  bool initialized = false;

  Map<String, dynamic> toMap() {
    return {
      'collections' : jsonEncode(collections),
      'currentCollection': currentCollection.toJson(),
      'devices': jsonEncode(devices),
      'eventTypes': jsonEncode(eventTypes),
      'initialized' : initialized,
      'labelConfiguration' : jsonEncode(labelConfig),
      'restRequestUrl' : restRequestUrl,
    };
  }

  Map<String, dynamic> loginDataToMap() {
    return {
      'loginInformation' : loginInformation.toJson(),
    };
  }

  void loginDataFromMap(Map<String, dynamic> map){
    loginInformation = SensorLogin.fromJson(map['loginInformation']);
  }

  void fromMap(Map<String, dynamic> map) {
    List<dynamic> dynList = jsonDecode(map['collections']);
    collections = [];
    for (var element in dynList){
      collections.add(Collection.fromJson(element));
    }
    currentCollection = Collection.fromJson(map['currentCollection']);

    dynList = jsonDecode(map['devices']);
    devices = [];
    for (var element in dynList){
      devices.add(Device.fromJson(element));
    }

    dynList = jsonDecode(map['eventTypes']);
    eventTypes = [];
    for (var element in dynList){
      eventTypes.add(EventType.fromJson(element));
    }

    labelConfig = LabelConfiguration.fromJson(map['labelConfiguration']);
    restRequestUrl = map['restRequestUrl'];

    initialized = map['initialized'];
  }


  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('', '');
    initialized = false;
  }
}


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

  @override
  void reset(){
    super.reset();
    deleteSharedPrefs();
  }

  Future<void> storeToSharedPrefs() async {

    const secureStorage = FlutterSecureStorage();
    var writeData = await secureStorage.write(key: 'login', value: jsonEncode(loginDataToMap()));

    final prefs = await SharedPreferences.getInstance();
    prefs.setString('configuration', jsonEncode(toMap()));


    debugPrint('Stored current configuration to shared prefs');
  }

  Future<void> loadFromSharedPrefs() async {

    const secureStorage = FlutterSecureStorage();
    final String? readData = await secureStorage.read(key: 'login');
    if (readData != null) {
      loginDataFromMap(jsonDecode(readData));
      debugPrint('Login loaded from secure storage');
    }else{
      debugPrint('Failed to load login details from secure storage');
    }

    final prefs = await SharedPreferences.getInstance();
    final String? configuration = prefs.getString('configuration');
    if (configuration != null){
      debugPrint('Configuration String: ' + configuration);
      fromMap(jsonDecode(configuration));
      debugPrint('Configuration loaded from shared preferences');
    }else{
      debugPrint('Failed to load configuration from shared preferences.');
    }
  }

  Future<void> deleteSharedPrefs() async {
    final prefs = await SharedPreferences.getInstance();
    prefs.clear();
    await prefs.remove('configuration');

    const secureStorage = FlutterSecureStorage();
    secureStorage.delete(key: 'login');
  }

  factory ConfigurationStoreInstance() {
    return _instance;
  }

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


abstract class EventStoreBase{
  bool gnssSync = true;
  bool showAllEvents = false;
  Event currentEvent = Event(
      id: 0,
      urnId:-1,
      urn:'urn0',
      label:'',
      type:'',
      typeId:-1,
      description:'',
      status:'PENDING',
      startDate:'',
      endDate: '',
      latitude: '',
      longitude: '',
      elevation: ''
  );

  Map<String, dynamic> toMap() {
    return {
      'currentEvent' : currentEvent.toJson(),
      'gnssSync' : gnssSync,
      'showAllEvents' : showAllEvents
    };
  }

  void fromMap(Map<String, dynamic> map) {
    currentEvent = Event.fromJson(map['currentEvent']);
    gnssSync = map['gnssSync'];
    showAllEvents = map['showAllEvents'];
  }
}


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

  Future<void> storeToSharedPrefs() async {
    final prefs = await SharedPreferences.getInstance();
    prefs.setString('currentEvent', jsonEncode(toMap()));
    debugPrint('Stored current event to shared prefs');
  }

  Future<void> loadFromSharedPrefs() async {
    final prefs = await SharedPreferences.getInstance();
    final String? currentEvent = prefs.getString('currentEvent');
    if (currentEvent != null){
      debugPrint('Configuration Current Event String: ' + currentEvent);
      fromMap(jsonDecode(currentEvent));
      debugPrint('Configuration Current Event loaded from shared preferences');
    }else{
      debugPrint('Failed to load Current Event configuration from shared preferences.');
    }
  }

  Future<void> deleteSharedPrefs() async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.remove('currentEvent');
  }

  factory EventStoreInstance() {
    return _instance;
  }

  EventStoreInstance._internal() {
    currentEvent = Event(
        id:0,
        urnId:-1,
        urn:'urn0',
        label:'',
        type:'',
        typeId:-1,
        description:'',
        status:'PENDING',
        startDate:'',
        endDate: '',
        latitude: '',
        longitude: '',
        elevation: ''
    );;
  }

  void reset(){
    gnssSync = true;
    showAllEvents = false;
    currentEvent = Event(
        id:0,
        urnId:-1,
        urn:'urn0',
        label:'',
        type:'',
        typeId:-1,
        description:'',
        status:'PENDING',
        startDate:'',
        endDate: '',
        latitude: '',
        longitude: '',
        elevation: ''
    );
    deleteSharedPrefs();
  }
}

String versionNumber = '';
String buildNumber = '';
Future<void> loadVersionInfo() async {
  PackageInfo packageInfo = await PackageInfo.fromPlatform();
  versionNumber = packageInfo.version;
  buildNumber = packageInfo.buildNumber;
}

String getVersion(){
  return versionNumber;
}

String getBuildNumber(){
  return buildNumber;
}