import 'dart:async';
import 'dart:io';

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:device_info/device_info.dart';
import 'package:dio/dio.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:logging/logging.dart';
import 'package:package_info/package_info.dart';
import 'package:path/path.dart' as Path;
import 'package:fcs/model/shared_pref.dart';
import 'package:fcs/util.dart';
import 'package:fcs/vo/bank_account.dart';
import 'package:fcs/vo/buyer.dart';
import 'package:fcs/vo/setting.dart';
import 'package:fcs/widget/NetworkConnectivity.dart';

import '../config.dart';
import '../vo/status.dart';
import '../vo/user.dart';
import 'api_helper.dart';
import 'base_model.dart';
import 'constants.dart';
import 'firebase_helper.dart';

class ImplementInterfaceModel {
  void initUser(User user) => {};
  void initSetting(Setting setting) => {};
}

class MainModel extends ChangeNotifier {
  final log = Logger('MainModel');

  final FirebaseAuth auth = FirebaseAuth.instance;
  FirebaseMessaging firebaseMessaging;

  List<BaseModel> models = [];
  User user;
  Buyer buyer;
  FirebaseUser firebaseUser;
  StreamSubscription<DocumentSnapshot> userListener;
  StreamSubscription<DocumentSnapshot> buyerListener;
  bool pinRequired;
  Timer pinTimer;

  User customer = User(
      name: "Ko Myo Min",
      phoneNumber: '+95 9 444444444',
      fcsID: 'FCS-0203-390-2',
      shippingAddress:
          '154-19 64th Ave.Flushing, NY 11367 TEL. +1 (929) 215-2247',
      deliveryAddress: '39 42th St. Kyaut Ta Thar Township Yangon');

  Setting setting;
  PackageInfo packageInfo;
  bool isLoaded = true;
  bool isOnline = true;

  static const PIN_TIME_MIN = 10;

  MainModel() {
    // NetworkConnectivity.instance.statusStream.listen((data) {
    //   bool _isOnline = data["isOnline"];
    //   if (_isOnline && !this.isOnline) {
    //     init();
    //   }
    //   this.isOnline = _isOnline;
    //   notifyListeners();
    // });
  }

  resetPinTimer() {
    if (pinTimer != null && pinTimer.isActive) {
      pinTimer.cancel();
    }
    pinRequired = false;
    pinTimer = Timer(Duration(minutes: PIN_TIME_MIN), () {
      pinRequired = true;
    });
  }

  bool isLogin() {
    return true;
  }

  bool hasEmail() {
    return this.user != null && this.user.isEmail();
  }

  bool agreedTerm() {
    return this.user != null && this.user.agreeTerms;
  }

  bool isBuyer() {
    return this.user == null || this.user.isBuyer();
  }

  bool isRegBuyer() {
    return isBuyer() && buyer != null;
  }

  bool isApprovedBuyer() {
    return isBuyer() && buyer != null && buyer.isApproved();
  }

  bool isSysAdmin() {
    return this.user != null && this.user.isSysAdmin();
  }

  bool isSysSupport() {
    return this.user != null && this.user.isSysSupport();
  }

  bool isBizAdmin() {
    return this.user != null && this.user.isBizAdmin();
  }

  bool isOwnerAndAbove() {
    return this.user != null && this.user.isOwnerAndAbove();
  }

  bool isAdmin() {
    return this.user != null && this.user.hasAdmin();
  }

  bool showHistoryBtn() {
    return isSysAdmin() || isSysSupport() || isBizAdmin();
  }

  init() async {
    // await _loadSetting();
    // _loadUser();
    // resetPinTimer();
  }

  void addModel(BaseModel model) {
    models.add(model);
    model.mainModel = this;
  }

  void _initUser(User user) {
    models.forEach((m) => m.initUser(user));

    if (firebaseMessaging != null) {
      firebaseMessaging.subscribeToTopic(user.docID);
    }
  }

  void _initSetting(Setting setting) {
    models.forEach((m) => m.initSetting(setting));
  }

  Future<void> _loadSetting() async {
    this.setting = await _getSetting();
    this.packageInfo = await PackageInfo.fromPlatform();
    _initSetting(setting);
  }

  void _loadUser() async {
    this.firebaseUser = await auth.currentUser();
    if (this.firebaseUser == null) {
      this.isLoaded = true;
      notifyListeners();
      return;
    }

    _logUser(this.firebaseUser);

    // load from local, if successful,notify listeners
    User _user = await SharedPref.getUser();
    if (_user != null) {
      await _user.setFirebaseUser(this.firebaseUser);
      _initUser(_user);
      this.user = _user;

      if (this.user.isRegisteredBuyer()) {
        _loadBuyer();
      }
      this.isLoaded = true;
      notifyListeners();
      log.info("user loaded from shared pref!");
    }

    _listenUser();
  }

  void _listenUser() {
    if (this.userListener != null) {
      this.userListener.cancel();
    }

    this.userListener = getDocSnapshot(
            "/$biz_collection/${setting.okEnergyId}/$user_collection",
            firebaseUser.uid)
        .listen((userSnap) async {
      if (userSnap.exists) {
        User _user = User.fromMap(userSnap.data, userSnap.documentID);

        // load claims
        try {
          FirebaseUser _firebaseUser = await getProfile(this.firebaseUser);

          await _user.setFirebaseUser(_firebaseUser);
          _initUser(_user);
          this.user = _user;
          this.firebaseUser = _firebaseUser;
          await SharedPref.saveUser(this.user);
        } catch (e) {
          log.warning(e.toString());
        }

        log.info(
            "_loadUser => ID: ${this.user.docID}, AccountID: ${this.user.accountID},"
            "BizID: ${this.user.accountID},"
            ", Privileges: ${this.user.claimPrivileges}, isSysAdmin: ${this.user.isSysAdmin()}");

        if (this.user.isRegisteredBuyer()) {
          _loadBuyer();
        }
        this.isLoaded = true;
        notifyListeners();
      }
    });
  }

  void _loadBuyer() async {
    if (this.user == null) return;
    if (buyerListener != null) buyerListener.cancel();
    buyerListener = getDocSnapshot(
            "/$biz_collection/${setting.okEnergyId}/$buyer_collection",
            this.user.docID)
        .listen((buyerSnap) async {
      if (buyerSnap.exists) {
        this.buyer = Buyer.fromMap(buyerSnap.data, buyerSnap.documentID);
      } else {
        this.buyer = null;
      }
      notifyListeners();
    });
  }

  @override
  void dispose() {
    // super.dispose();
    // if (this.userListener != null) {
    //   this.userListener.cancel();
    // }
    // SharedPref.removeUser();
    // this.user = User();
  }

  Future<void> login(String phoneNumber, String pass) async {
    var id = phoneNumber.replaceFirst("+", "");
    id = updatePhoneNumber(id);

    var data = {"id": id, "password": pass};
    var result = await requestAPI("/login", "POST", payload: data);

    var token = result["Token"];

    // login with custom token
    AuthResult r = await this.auth.signInWithCustomToken(token: token);
    this.firebaseUser = r.user;
    isLoaded = false;
    _loadUser();
    _logUser(this.firebaseUser);
  }

  Future<FirebaseUser> getProfile(FirebaseUser firebaseUser) async {
    IdTokenResult idtoken = await firebaseUser.getIdToken();
    var data = await requestAPI(
      "/profile",
      "GET",
      token: idtoken.token,
    );
    var _token = data["Token"];
    AuthResult a = await this.auth.signInWithCustomToken(token: _token);
    return a.user;
  }

  Future<void> _logUser(FirebaseUser firebaseUser) async {
    IdTokenResult idtoken = await firebaseUser.getIdToken();

    await requestAPI(
      "/log",
      "GET",
      token: idtoken.token,
    );
  }

  Future<void> logout() async {
    if (this.userListener != null) {
      await this.userListener.cancel();
    }

    await auth.signOut();
    this.user = null;
    this.buyer = null;
    this.firebaseUser = null;
    await SharedPref.removeUser();
    if (firebaseMessaging != null) {
      firebaseMessaging.unsubscribeFromTopic(user.docID);
    }

    // logout models
    models.forEach((m) => m.logout());

    notifyListeners();
  }

  Future<void> signup(
      String name, password, confirmPassword, phoneNumber) async {
    if (password == "" || password.length < 6) {
      throw Exception("Password must be at least 6 characters");
    }
    if (password != confirmPassword) {
      throw Exception("Password mismatch");
    }
    var id = phoneNumber.replaceFirst("+", "");
    id = updatePhoneNumber(id);

    var inputData = {"id": id, "password": password, "user_name": name};
    DeviceInfoPlugin deviceInfo = DeviceInfoPlugin();
    AndroidDeviceInfo androidInfo = await deviceInfo.androidInfo;
    String deviceName = "${androidInfo.model}(${androidInfo.id})";

    var url = "${Config.instance.apiURL}/signup";
    Response response = await Dio().post(url,
        data: inputData,
        options: Options(
            headers: {"Device": androidInfo.androidId + ":" + deviceName}));

    var data = Status.fromJson(response.data);
    if (data.status != 'Ok') {
      throw Exception("${data.errorCode} : ${data.message}");
    }
  }

  Future<void> confirmSignup(
      String phoneNumber, password, confirmSMSCode) async {
    var id = phoneNumber.replaceFirst("+", "");
    id = updatePhoneNumber(id);

    if (confirmSMSCode == "" || confirmSMSCode.length != 6) {
      throw Exception("Password must be 6 characters");
    }

    var inputData = {
      "id": id,
      "password": password,
      "confirmation_code": confirmSMSCode
    };
    var url = "${Config.instance.apiURL}/confirm";
    Response response = await Dio().post(
      url,
      data: inputData,
    );
    var data = Status.fromJson(response.data);
    if (data.status != 'Ok') {
      throw Exception(data.message);
    }
  }

  bool isSupport() {
    if (packageInfo == null || setting == null) return false;
    return int.parse(packageInfo.buildNumber) >= setting.supportBuildNum;
  }

  Future<Setting> _getSetting() async {
    var snap = await Firestore.instance
        .collection(config_collection)
        .document(setting_doc_id)
        .get();
    if (!snap.exists) {
      return null;
    }
    _listSetting();
    return Setting.fromMap(snap.data);
  }

  void _listSetting() {
    getDocSnapshot("/configs", setting_doc_id).listen((snap) {
      this.setting = Setting.fromMap(snap.data);
      notifyListeners();
    });
  }

  Future<void> updateProfile(String name) async {
    await requestAPI("/user", "PUT",
        payload: {"user_name": name}, token: await getToken());
  }

  Future<void> updateTerms(String terms) async {
    await requestAPI("/terms", "PUT",
        payload: {"terms": terms}, token: await getToken());
  }

  Future<void> agreeTerms() async {
    await requestAPI("/user/agree", "PUT", token: await getToken());
  }

  Future<void> updateContact(Setting setting) async {
    await requestAPI("/contact", "PUT",
        payload: {
          'email': setting.email,
          'facebook_url': setting.facebook,
          'web_url': setting.website,
          'phones': setting.phones,
          'bank_account_info': setting.bankAccountInfo,
          'delivery_phone': setting.deliveryPhone,
          'address': setting.address,
        },
        token: await getToken());
  }

  Future<void> updateSetting(Setting setting) async {
    await requestAPI("/setting", "PUT",
        payload: {
          'do_expire_hours': setting.doExpireInHours,
          'po_expire_hours': setting.poExpireInHours,
          'po_open_at': setting.poOpenAt,
          'po_close_at': setting.poCloseAt,
          'po_close_on': setting.poCloseOn,
          'first_storage_charge_in': setting.firstStorageChargeIn,
          'first_storage_charge': setting.firstStorageCharge,
          'second_storage_charge_in': setting.secondStorageChargeIn,
          'second_storage_charge': setting.secondStorageCharge,
          'latest_delivery_days': setting.latestDeliveryDay,
        },
        token: await getToken());
  }

  Future<void> addBankAccount(BankAccount bankAccount, File image) async {
    String url = await uploadStorage(bank_images_path, image);
    bankAccount.bankLogo = url;

    await requestAPI("/bank_accounts", "POST",
        payload: bankAccount.toMap(), token: await getToken());
  }

  Future<void> updateBankAccount(BankAccount bankAccount, File image) async {
    if (image != null) {
      String url = await uploadStorage(bank_images_path, image);
      bankAccount.bankLogo = url;
    }

    await requestAPI("/bank_accounts", "PUT",
        payload: bankAccount.toMap(), token: await getToken());
  }

  Future<void> deleteBankAccount(BankAccount bankAccount) async {
    await requestAPI("/bank_accounts", "DELETE",
        payload: bankAccount.toMap(), token: await getToken());
  }
}