export class UserService {

  /**
  * Validate user's password - returns true if validated
  * Used in register and updatePassword functions
  */
  passwordValidation(pass: string) : boolean {
    if (pass.length >= 8 && /\d/.test(pass) && /[a-z]/.test(pass) && /[A-Z]/.test(pass))
      return true;
    else return false;
  }

  /**
   * Represents observer currently of logged user
   */
  loggedUser: Subject<User>;

  /**
   * Http headers and options used to create http requests
   */
  headers: Headers;
  options: RequestOptions;

  constructor(private http: Http) {

    this.loggedUser = new Subject<User>();

    this.headers = new Headers({'Content-Type': 'application/json'});
    this.options = new RequestOptions({headers: this.headers});
  }

  /**
   * Logs in existing user into selfiemap app
   * @param username Name of user
   * @param password Password of user
   */
  login(username: string, password: string) {

    let body = JSON.stringify({username, password});

    this.http.post(API_USER_LOGIN, body, this.options)
      .map(data => data.json()).subscribe((user) => {

      this.loggedUser.next(user);
    })
  }

  /**
   * Registers new user into selfiemap app
   * @param username Name of user
   * @param password Password of user
   * @param email E-mail of user
   * @param birthDate Birth date of user
   */
  register(username: string, password: string, email: string, birthDate: Date) {
    if (this.passwordValidation(password)) {
      let body = JSON.stringify({username, password, email, birthDate});

          this.http.post(API_USER_REGISTER, body, this.options)
            .map(data => data.json()).subscribe((user) => {

            this.loggedUser.next(user);
          });
    }
    else console.log('Bad password')
  }

  /**
   * Update password of existing user
   * @param oldPassword Old password to verify ownership of account
   * @param newPassword New password
   */
  updatePassword(oldPassword: string, newPassword: string) {
    if (this.passwordValidation(newPassword)) {
      let body = JSON.stringify({oldPassword, newPassword});

      this.http.put(API_USER_CHANGEPASSWORD, body, this.options)
      .map(data => data.json()).subscribe((user) => {

      this.loggedUser.next(user);
    });
    }
    else console.log('Bad password');
  }

  /**
   * Change user's language of seliemap app
   * @param language Language id (sk,cz,en,...)
   */
  setLanguage(language: string) {

    let body = JSON.stringify({language});
    this.http.put(API_USER_LANGUAGE, body, this.options)
      .map(data => data.json()).subscribe((user) => {

      this.loggedUser.next(user);
    });
  }

  /**
   * Change privacy of user's account
   * @param privateProfile If true, user's profile is private, if false, user's profile is public
   */
  setPrivacy(privateProfile: boolean) {

    let body = JSON.stringify({privateProfile});
    this.http.put(API_USER_PRIVACY, body, this.options)
      .map(data => data.json()).subscribe((user) => {

      this.loggedUser.next(user);
    });
  }

  /**
   * Get last known location of user
   * @returns {string} Last location
   */
  getLastLocation() {

    return '';
  }
}