@Injectable()
export class AuthenticationService {
    constructor(private http: Http) { }

    login(username: string, password: string) {

        let loginURL = CONFIGURATION.agileUrls+'oauth2/token';

        let headers = new Headers({
            'Accept': 'application/json',
            'Content-Type': 'application/x-www-form-urlencoded'
        });

        let postRequestBody = 'grant_type=password&username='+username+'&password='+password+'&client_id=8737e3f7a7984167b4d09f658a76bf32';

        let options = new RequestOptions({ headers: headers });

        return this.http.post(loginURL, postRequestBody, options)
            .map((response: Response) => {
                // login successful if there's a jwt token in the response
                console.log('Response: ', response.json());
                let user = response.json();
                if (user && user.access_token) {

                    // store user details and jwt token in local storage to keep user logged in between page refreshes
                    let userDetails = {
                        'user': user,
                        'username': username
                    }

                    localStorage.setItem('currentUser', JSON.stringify(userDetails));
                }
            })
            .catch(res => {
                console.log('CATCH: ', res.json());
                throw(res.json());
            });
    }

    logout() {
        // remove user from local storage to log user out
        localStorage.removeItem('currentUser');
    }
}