import {Injectable} from '@angular/core';
import {BehaviorSubject, Observable} from 'rxjs';
import {HttpClient, HttpHeaders, HttpParams} from '@angular/common/http';
import {environment} from '@src/environments/environment';
import {first} from 'rxjs/operators';
import {AccountIndex, MutableKeyStore, MutablePgpKeyStore, PGPSigner, Registry, Signer} from '@app/_helpers';
import {ArgPair, Envelope, Syncable, User} from 'cic-client-meta';
const vCard = require('vcard-parser');

@Injectable({
  providedIn: 'root'
})
export class UserService {
  headers: HttpHeaders = new HttpHeaders({'x-cic-automerge': 'client'});
  keystore: MutableKeyStore = new MutablePgpKeyStore();
  signer: Signer = new PGPSigner(this.keystore);
  registry = new Registry(environment.registryAddress);

  accountsMeta = [];
  accounts: any = [];
  private accountsList = new BehaviorSubject<any>(this.accounts);
  accountsSubject = this.accountsList.asObservable();

  actions: any = '';
  private actionsList = new BehaviorSubject<any>(this.actions);
  actionsSubject = this.actionsList.asObservable();

  staff: any = '';
  private staffList = new BehaviorSubject<any>(this.staff);
  staffSubject = this.staffList.asObservable();

  constructor(private http: HttpClient) {
  }

  resetPin(phone: string): Observable<any> {
    const params = new HttpParams().set('phoneNumber', phone);
    return this.http.get(`${environment.cicUssdUrl}/pin`, { params });
  }

  async changeAccountInfo(address: string, status: string, name: string, phoneNumber: string, age: string, type: string, token: string,
                          failedPinAttempts: string, bio: string, gender: string, businessCategory: string, userLocation: string,
                          location: string, locationType: string, referrer: string): Promise<any> {
    const accountDetails = {
      status,
      name,
      phoneNumber,
      age,
      type,
      token,
      failedPinAttempts,
      bio,
      gender,
      businessCategory,
      userLocation,
      location,
      locationType,
      referrer
    };
    const accountKey = await User.toKey(address);
    this.http.get<JSON>(`${environment.cicMetaUrl}/${accountKey}`, { headers: this.headers }).pipe(first()).subscribe(async res => {
      const syncableAccount: Syncable = Envelope.fromJSON(JSON.stringify(res)).unwrap();
      let update = [];
      for (const prop in accountDetails) {
        update.push(new ArgPair(prop, accountDetails[prop]));
      }
      syncableAccount.update(update, 'client-branch');
      await this.updateMeta(syncableAccount, accountKey, this.headers);
    }, async error => {
      console.error('There is an error!', error);
      const syncableAccount: Syncable = new Syncable(accountKey, accountDetails);
      await this.updateMeta(syncableAccount, accountKey, this.headers);
    });
    return accountKey;
  }

  async updateMeta(syncableAccount: Syncable, accountKey: string, headers: HttpHeaders): Promise<any> {
    const envelope = await this.wrap(syncableAccount , this.signer);
    const reqBody = envelope.toJSON();
    this.http.put(`${environment.cicMetaUrl}/${accountKey}`, reqBody , { headers }).pipe(first()).subscribe(res => {
      console.log(res);
    });
  }

  getAccounts(): void {
    this.http.get(`${environment.cicCacheUrl}/accounts`).pipe(first()).subscribe(accounts => this.accountsList.next(accounts));
  }

  getAccountById(id: number): Observable<any> {
    return this.http.get(`${environment.cicCacheUrl}/accounts/${id}`);
  }

  getActions(): void {
    this.http.get(`${environment.cicCacheUrl}/actions`).pipe(first()).subscribe(actions => this.actionsList.next(actions));
  }

  getActionById(id: string): any {
    return this.http.get(`${environment.cicCacheUrl}/actions/${id}`);
  }

  approveAction(id: string): Observable<any> {
    return this.http.post(`${environment.cicCacheUrl}/actions/${id}`, { approval: true });
  }

  revokeAction(id: string): Observable<any> {
    return this.http.post(`${environment.cicCacheUrl}/actions/${id}`, { approval: false });
  }

  getHistoryByUser(id: string): Observable<any> {
    return this.http.get(`${environment.cicCacheUrl}/history/${id}`);
  }

  getStaff(): void {
    this.http.get(`${environment.cicCacheUrl}/staff`).pipe(first()).subscribe(staff => this.staffList.next(staff));
  }

  getStaffById(id: string): Observable<any> {
    return this.http.get(`${environment.cicCacheUrl}/staff/${id}`);
  }

  activateStaff(id: string): Observable<any> {
    return this.http.post(`${environment.cicCacheUrl}/staff/${id}`, {status: 'activated'});
  }

  deactivateStaff(id: string): Observable<any> {
    return this.http.post(`${environment.cicCacheUrl}/staff/${id}`, {status: 'deactivated'});
  }

  changeStaffType(id: string, type: string): Observable<any> {
    return this.http.post(`${environment.cicCacheUrl}/staff/${id}`, {accountType: type});
  }

  getAccountDetailsFromMeta(userKey: string): Observable<any> {
    return this.http.get(`${environment.cicMetaUrl}/${userKey}`, { headers: this.headers });
  }

  getUser(userKey: string): any {
    return this.http.get(`${environment.cicMetaUrl}/${userKey}`, { headers: this.headers }).pipe(first()).subscribe(async res => {
      return Envelope.fromJSON(JSON.stringify(res)).unwrap();
    });
  }

  wrap(syncable: Syncable, signer: Signer): Promise<Envelope> {
    return new Promise<Envelope>(async (whohoo, doh) => {
      syncable.setSigner(signer);
      syncable.onwrap = async (env) => {
        if (env === undefined) {
          doh();
          return;
        }
        whohoo(env);
      };
      await syncable.sign();
    });
  }

  async loadAccounts(limit: number, offset: number = 0): Promise<void> {
    this.resetAccountsList();
    const accountIndexAddress = await this.registry.addressOf('AccountRegistry');
    const accountIndexQuery = new AccountIndex(accountIndexAddress);
    const accountAddresses = await accountIndexQuery.last(await accountIndexQuery.totalAccounts());
    for (const accountAddress of accountAddresses.slice(offset, offset + limit)) {
      this.getAccountDetailsFromMeta(await User.toKey(accountAddress)).pipe(first()).subscribe(res => {
        const account = Envelope.fromJSON(JSON.stringify(res)).unwrap();
        this.accountsMeta.push(account);
        const accountInfo = account.m.data;
        accountInfo.vcard = vCard.parse(atob(accountInfo.vcard));
        this.accounts.unshift(accountInfo);
        if (this.accounts.length > limit) {
          this.accounts.length = limit;
        }
        this.accountsList.next(this.accounts);
      });
    }
  }

  resetAccountsList(): void {
    this.accounts = [];
    this.accountsList.next(this.accounts);
  }
}