import {Injectable} from "@angular/core";
import {UserDTO, UserRoles} from "../../../../common/entities/UserDTO";
import {Event} from "../../../../common/event/Event";
import {UserService} from "./user.service";
import {LoginCredential} from "../../../../common/entities/LoginCredential";
import {Message} from "../../../../common/entities/Message";
import {Cookie} from "ng2-cookies";
import {ErrorCodes} from "../../../../common/entities/Error";
import {Config} from "../../../../common/config/public/Config";

declare module ServerInject {
  export let user: UserDTO;
}

@Injectable()
export class AuthenticationService {

  private _user: UserDTO = null;
  public OnUserChanged: Event<UserDTO>;

  constructor(private _userService: UserService) {
    this.OnUserChanged = new Event();

    //picking up session..
    if (this.isAuthenticated() == false && Cookie.get('pigallery2-session') != null) {
      if (typeof ServerInject !== "undefined" && typeof ServerInject.user !== "undefined") {
        this.setUser(ServerInject.user);
      }
      this.getSessionUser();
    } else {
      this.OnUserChanged.trigger(this._user);
    }

  }

  private getSessionUser() {
    this._userService.getSessionUser().then((message: Message<UserDTO>) => {
      if (message.error) {
        console.log(message.error);
      } else {
        this._user = message.result;
        this.OnUserChanged.trigger(this._user);
      }
    });
  }

  private setUser(user: UserDTO) {
    this._user = user;
    this.OnUserChanged.trigger(this._user);
  }

  public login(credential: LoginCredential) {
    return this._userService.login(credential).then((message: Message<UserDTO>) => {
      if (message.error) {
        console.log(ErrorCodes[message.error.code] + ", message: ", message.error.message);
      } else {
        this.setUser(message.result);
      }
      return message;
    });
  }


  public isAuthenticated(): boolean {
    if (Config.Client.authenticationRequired === false) {
      return true;
    }
    return !!(this._user && this._user != null);
  }

  public getUser() {
    if (Config.Client.authenticationRequired === false) {
      return <UserDTO>{name: "", password: "", role: UserRoles.Admin};
    }
    return this._user;
  }

  public logout() {
    this._userService.logout();
    this.setUser(null);
  }


}