import { Injectable } from '@angular/core';
import * as jwt_decode from 'jwt-decode';
import { BehaviorSubject } from 'rxjs';
import { TOKEN_DURATION } from './global.const';
import { Utils } from './utils';

declare var Keycloak: any;
declare let CONFIG: any;
// @dynamic
@Injectable({
	providedIn: 'root',
})
export class KeycloakService {
	private keycloakSetup = new BehaviorSubject<boolean>(false);
	private refreshToken = new BehaviorSubject<boolean>(false);
	static keycloak;
	keycloakConfig: any;
	cast = this.keycloakSetup.asObservable();
	refreshTokenCast = this.refreshToken.asObservable();
	static getKeycloak() {
		return KeycloakService.keycloak || this;
	}
	init() {
		this.keycloakConfig = new Keycloak(CONFIG.KEYCLOAK);
        KeycloakService.keycloak = this;
		this.keycloakConfig
			.init({ onLoad: 'login-required', checkLoginIframe: false })
			.then(() => {
				this.keycloakInitialised();
				this.saveToken();
				KeycloakService.keycloak = this;
			})
			.catch(error => {
				Utils.showError('keycloak.init()', error);
			});
	}

	keycloakInitialised() {
		// notify the keycloak initialisation completion
		this.keycloakSetup.next(true);
	}

	saveToken(): void {
        if (this.keycloakConfig.token) {
            if (!localStorage.getItem('espToken')) {
                setTimeout(()=> window.location.reload(), 1000);
            }
			localStorage.setItem('espToken', this.keycloakConfig.token);
			this.getUserDetail();
		}
	}

	getToken(): string {
		return this.keycloakConfig.token ? this.keycloakConfig.token : '';
	}

	updateToken() {
        if (this.keycloakConfig.updateToken) {
            return this.keycloakConfig.updateToken(TOKEN_DURATION);
        } else {
            window.location.reload();
        }
	}

	getUserDetail(): any {
		const userDetail = this.keycloakConfig ? jwt_decode(this.keycloakConfig.token) : null;
		localStorage.setItem('user-detail', JSON.stringify(userDetail));
		return userDetail;
	}

	login() {
		if (this.keycloakConfig) {
			this.keycloakConfig.login();
		}
	}

	logout() {
		localStorage.clear();
		this.keycloakConfig.logout({ redirectUrl: CONFIG.BASE_URL });
		this.keycloakConfig = null;
	}
}

export function kcFactory(keycloakService: KeycloakService) {
	return () => setTimeout(() => keycloakService.init(), 1000);
}