import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';

import { Observable} from 'rxjs/Rx';

import * as base64 from 'base64util';

import { Logger } from '@nsalaun/ng-logger';
import { NgbModal } from '@ng-bootstrap/ng-bootstrap';

import { Token } from './token';
import { LoginModalComponent } from './loginModal.component';
import { Login } from './login';

@Injectable()
export class LoginService {

    constructor(
        private httpClient: HttpClient,
        private logger: Logger,
        private ngbModal: NgbModal,
    ) {}

    public readonly url: string = '/api/user/login';

    login(): Observable<Token> {
        let modal = this.ngbModal.open(LoginModalComponent);

        sessionStorage.clear();

        let observable: Observable<any> = Observable.fromPromise(modal.result);

        return observable.flatMap((login: Login) =>
            this.doLogin(login)
        ).map((token: Token): Token => {
            this.accessToken = token.access_token;
            return token;
        });
    }

    logout() {
        sessionStorage.clear();
    }

    doLogin(login: Login): Observable<any> {
        var authdata = base64.encode(
            `${login.email}:${login.password}`
        );

        let headers = new HttpHeaders()
        headers = headers.set('Authorization', `Basic ${authdata}`);

        this.logger.log("Headers", headers);

        return this.httpClient.post(this.url, {}, {
            headers: headers
        });
    }

    get accessToken(): string {
        return sessionStorage.getItem('access_token');
    }

    set accessToken(token: string) {
        sessionStorage.setItem('access_token', token);
    }
};