import ngModule from '../module';
import UserError from 'core/lib/user-error';

/**
 * Authentication service.
 *
 * @property {Boolean} loggedIn Whether the user is currently logged
 */
export default class Auth {
    constructor($http, $state, $transitions, $window, vnToken, vnModules, aclService) {
        Object.assign(this, {
            $http,
            $state,
            $transitions,
            $window,
            vnToken,
            vnModules,
            aclService,
            token: null,
            loggedIn: false,
            dataLoaded: false
        });
    }
    initialize() {
        this.loggedIn = this.vnToken.token != null;

        let criteria = {
            to: state => state.name != 'login'
        };
        this.$transitions.onStart(criteria, transition => {
            if (!this.loggedIn) {
                let params = {continue: this.$window.location.hash};
                return transition.router.stateService.target('login', params);
            }
            if (!this.dataLoaded) {
                this.resetData();
                this.dataLoaded = true;
                return this.aclService.load();
            }

            return true;
        });
    }
    login(user, password, remember) {
        if (!user)
            throw new UserError('Please insert your user and password');

        let params = {
            user,
            password: password || undefined
        };
        return this.$http.post('/api/Accounts/login', params).then(
            json => this.onLoginOk(json, remember),
            json => this.onLoginErr(json)
        );
    }
    onLoginOk(json, remember) {
        this.resetData();
        this.vnToken.set(json.data.token, remember);
        this.loggedIn = true;

        let continueHash = this.$state.params.continue;

        if (continueHash)
            this.$window.location = continueHash;
        else
            this.$state.go('home');
    }
    onLoginErr(json) {
        let message;

        switch (json.status) {
        case 401:
            message = 'Invalid credentials';
            break;
        case -1:
            message = 'Can\'t contact with server';
            break;
        default:
            message = 'Something went wrong';
        }

        throw new UserError(message);
    }
    logout() {
        let promise = this.$http.post('/api/Accounts/logout', null, {
            headers: {Authorization: this.vnToken.token}
        });

        this.vnToken.unset();
        this.loggedIn = false;
        this.resetData();
        this.$state.go('login');

        return promise;
    }
    resetData() {
        this.aclService.reset();
        this.vnModules.reset();
        this.dataLoaded = false;
    }
}
Auth.$inject = ['$http', '$state', '$transitions', '$window', 'vnToken', 'vnModules', 'aclService'];

ngModule.service('vnAuth', Auth);