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, $q, vnApp, $translate, $state, $transitions, $window, vnToken, vnModules) {
        Object.assign(this, {
            $http,
            $q,
            vnApp,
            $translate,
            $state,
            $transitions,
            $window,
            vnToken,
            vnModules,
            loggedIn: false
        });
    }

    initialize() {
        let criteria = {
            to: state => {
                const outLayout = ['login', 'recover-password', 'reset-password', 'change-password', 'validate-email'];
                return !outLayout.some(ol => ol == state.name);
            }
        };
        this.$transitions.onStart(criteria, transition => {
            if (this.loggedIn)
                return true;

            let redirectToLogin = () => {
                return transition.router.stateService.target('login', {
                    continue: this.$window.location.hash
                });
            };

            if (this.vnToken.token) {
                const loadWithRetry = () => {
                    return this.validateToken()
                        .then(() => true)
                        .catch(err => {
                            switch (err.status) {
                            case 400:
                            case 401:
                                return redirectToLogin();
                            default:
                                return new Promise(resolve => {
                                    setTimeout(() => {
                                        this.vnApp.showMessage(this.$translate.instant('Loading...'));

                                        resolve(loadWithRetry());
                                    }, 2000);
                                });
                            }
                        });
                };
                return loadWithRetry();
            } else
                return redirectToLogin();
        });
    }

    login(user, password, remember) {
        if (!user) {
            let err = new UserError('Please enter your username');
            err.code = 'EmptyLogin';
            return this.$q.reject(err);
        }

        let params = {
            user,
            password: password || undefined
        };

        const now = new Date();
        return this.$http.post('VnUsers/sign-in', params).then(
            json => this.onLoginOk(json, now, remember));
    }

    validateCode(user, password, code, remember) {
        if (!user) {
            let err = new UserError('Please enter your username');
            err.code = 'EmptyLogin';
            return this.$q.reject(err);
        }

        let params = {
            user: user,
            password: password || undefined,
            code: code
        };

        const now = new Date();
        return this.$http.post('VnUsers/validate-auth', params)
            .then(json => this.onLoginOk(json, now, remember));
    }

    onLoginOk(json, now, remember) {
        return this.$http.get('VnUsers/ShareToken', {
            headers: {Authorization: json.data.token}
        }).then(({data}) => {
            this.vnToken.set(json.data.token, data.multimediaToken.id, now, json.data.ttl, remember);
            let continueHash = this.$state.params.continue;
            if (continueHash)
                this.$window.location = continueHash;
            else
                this.$state.go('home');
        }).catch(() => {});
    }

    logout() {
        this.$http.post('Accounts/logout', null, {headers: {'Authorization': this.vnToken.tokenMultimedia},
        }).catch(() => {});

        let promise = this.$http.post('VnUsers/logout', null, {
            headers: {Authorization: this.vnToken.token}
        }).catch(() => {});
        this.vnToken.unset();
        this.loggedIn = false;
        this.vnModules.reset();
        this.vnModules.aclService.reset();
        this.$state.go('login');

        return promise;
    }

    validateToken() {
        return this.$http.get('VnUsers/validateToken')
            .then(() => {
                this.loggedIn = true;
                this.vnModules.reset();
            })
            .catch(err => {
                throw err;
            });
    }
}
Auth.$inject = [
    '$http', '$q', 'vnApp', '$translate', '$state',
    '$transitions', '$window', 'vnToken', 'vnModules'];

ngModule.service('vnAuth', Auth);