import { HttpClient } from '@angular/common/http';
import { inject, Injectable } from '@angular/core';
import { ExternalLogin, Login } from '../models/login';
import { RegisterInfo } from '../models/register-info';
import { LoginResult, User } from '../models/user';
import { parseUser } from './jwt-util';

/** Authentication API Service */
@Injectable({
  providedIn: 'root'
})
export class Authentication {

  private http = inject(HttpClient);

  /** Send basic credentials to login endpoint. */
  public async login(userData: Login): Promise<LoginResult> {
    return this.loginPost('/login', userData);
  }

  /** Send user info from 3rd party provider to external login endpoint. */
  public async loginWith(userInfo: ExternalLogin): Promise<LoginResult> {
    return this.loginPost('/extlogin', userInfo);
  }

  /** Send user info to register endpoint. */
  public async register(userData: RegisterInfo): Promise<LoginResult> {
    return this.loginPost('/register', userData);
  }

  protected async loginPost(endpoint: string, userData: any): Promise<LoginResult> {
    let user: User;
    try {
      const data = await this.http.post(endpoint, userData).toPromise() as string;
      user = parseUser(data);
    } catch (e: any) {
      return { error: e.message };
    }

    return { user };
  }
}