import {inject, Injectable} from '@angular/core';
import {SigninRequest} from '../../core/rest-services/user/model/signin.model';
import {FormError} from '../../core/model/FormError';
import {BehaviorSubject, Observable} from 'rxjs';
import {copy} from '../../core/utils/ObjectUtils';
import {UserRestService} from '../../core/rest-services/user/user.rest-service';
import {MatSnackBar} from '@angular/material/snack-bar';
import {Router} from '@angular/router';
import {LoginService} from '../login/login.service';

export interface SigninState {
  request: SigninRequest;
  confirmPassword?: string;
  errors: FormError[];
}

const DEFAULT_STATE: SigninState = {
  request: {
    pseudo: undefined,
    email: undefined,
    password: undefined,
  },
  confirmPassword: undefined,
  errors: [],
};

@Injectable()
export class SigninService {
  private stateSubject = new BehaviorSubject<SigninState>(copy(DEFAULT_STATE));
  private userRestService = inject(UserRestService);
  private snackBar = inject(MatSnackBar);
  private router = inject(Router);
  private loginService = inject(LoginService);

  get state$(): Observable<SigninState> {
    return this.stateSubject.asObservable();
  }

  private get state(): SigninState {
    return this.stateSubject.value;
  }

  private save(newState: SigninState): void {
    this.stateSubject.next(newState);
  }

  editPseudo(newPseudo: string): void {
    const state = this.state;

    state.request.pseudo = newPseudo;

    this.save(state);
  }

  editEmail(newEmail: string): void {
    const state = this.state;

    state.request.email = newEmail;

    this.save(state);
  }

  editPassword(newPassword: string): void {
    const state = this.state;

    state.request.password = newPassword;

    this.save(state);
  }

  editConfirmPassword(newConfirmPassword: string): void {
    const state = this.state;

    state.confirmPassword = newConfirmPassword;

    if (state.request.password !== state.confirmPassword) {
      const confirmPasswordError: FormError = {
        fieldName: 'confirmPassword',
        errorMessage: $localize`Typed passwords are different.`
      }
      state.errors.filter(error => error.fieldName !== 'confirmPassword');
      state.errors.push(confirmPasswordError)
    }

    this.save(state);
  }

  performSignin(): void {
    const state = this.state;

    // Check state is valid

    this.userRestService
      .signin(state.request)
      .then(() => {
        this.loginService.editEmail(state.request.email!!);
        this.loginService.editPassword(state.request.password!!);

        this.loginService.performLogin();
      })
  }
}