import {Injectable} from '@angular/core';
import {Observable} from 'rxjs';
import {HttpClient} from '@angular/common/http';
import {Token} from './token';
import {Host} from './host';
import {ChatMessage} from './chat.message';
import {ChatTokenResponse} from './chat.token';

@Injectable({
  providedIn: 'root'
})
export class ApiService {
  public static userToken: string;

  constructor(private client: HttpClient) {
  }

  storeData(key: string, value: string): void
  {
    sessionStorage.setItem(key, value);
  }

  getFromStorage(key: string): string {
    return sessionStorage.getItem(key);
  }

  getAuthToken(username: string, password: string): Observable<Token> {
    return this.client.post<Token>(Host.URL + '/token', {username, password});
  }

  getChatToken(authToken: string): Observable<ChatTokenResponse> {
    return this.client.get<ChatTokenResponse>(
      Host.URL + '/session/chat',
      {headers: {Authorization: 'Bearer ' + authToken}}
      );
  }

  getChatHistory(token: string, offset: number, limit: number): Observable<ChatMessage[]> {
    return this.client.get<ChatMessage[]>(
      Host.URL + '/session/chat/history?limit=' + limit + '&offset=' + offset,
      {headers: {Authorization: 'Bearer ' + token}}
    );
  }

  deleteAuthToken(token: string): Observable<string>
  {
    return this.client.delete<string>(
      Host.URL + '/token/' + token,
      {headers: {Authorization: 'Bearer ' + token}}
      );
  }
}