import { HttpClient, HttpHeaders } from '@angular/common/http';
import { Injectable, NgZone, Optional } from '@angular/core';
import { MatSnackBar } from '@angular/material';
import { ActivatedRoute, Router } from '@angular/router';
import { TranslateService } from '@ngx-translate/core';
import { environment } from '../../../environments/environment';
import { Credential } from '../../models/login/Credential';
import { LoginProviders } from '../../models/login/LoginInfo';
import { AuthService } from '../../services/auth/auth.service';
import { SnackBarNotificationComponent } from '../../shared/components/notificaiton/snack-bar-notification.component';
import { CultureService } from '../../utilities/culture/culture-service';
import { LoginOptions } from './LoginOptions';
import { LoginProviderConfiguration } from './LoginProviderConfiguration';
import { LoginServiceConfiguration } from './LoginServiceConfiguration';

declare const gapi: any;
declare const FB: any;
declare const IN: any;

@Injectable()
export class LoginService {

	private providers: LoginOptions[];
	private auth2: any;
	constructor(
		private router: Router,
		public authService: AuthService,
		public route: ActivatedRoute,
		public snackBar: MatSnackBar,
		public language: TranslateService,
		private zone: NgZone,
		private httpClient: HttpClient,
		private cultureService: CultureService,
		@Optional() private config: LoginServiceConfiguration
	) {
		if (config) {
			this.providers = config.loginProviders;
		} else { this.providers = [LoginOptions.nativeLogin]; }
	}

	public initProviders() {
		if (this.hasProvider(LoginOptions.googleOauth)) { this.initialiseGoogleOauth(); }
		if (this.hasProvider(LoginOptions.facebookOauth)) { this.initialiseFacebookOauth(); }
	}

	public hasProvider(provider: LoginOptions) {
		for (let i = 0; i < this.providers.length; i++) {
			if (provider === this.providers[i]) { return this.isProviderProperlyConfigured(provider); }
		}
		return false;
	}

	private isProviderProperlyConfigured(provider: LoginOptions) {
		switch (provider) {
			case LoginOptions.facebookOauth: return this.hasAllRequiredFieldsConfigured(this.config.facebookConfiguration);
			case LoginOptions.googleOauth: return this.hasAllRequiredFieldsConfigured(this.config.googleConfiguration);
			case LoginOptions.linkedInOauth: return this.hasAllRequiredFieldsConfigured(this.config.linkedInConfiguration);
			case LoginOptions.twitterOauth: return this.hasAllRequiredFieldsConfigured(this.config.twitterConfiguration);
			case LoginOptions.b2Access: return this.hasAllRequiredFieldsConfigured(this.config.b2accessConfiguration);
			case LoginOptions.nativeLogin: return true;
			default: throw new Error('Unsupported Provider Type');
		}
	}

	private hasAllRequiredFieldsConfigured(configuration: LoginProviderConfiguration) {
		if (configuration != null && configuration.clientId != null) { return true; }
		return false;
	}

	/*
	* GOOGLE SIGN IN
	*/

	private initialiseGoogleOauth(): void {
		gapi.load('auth2', () => {
			this.auth2 = gapi.auth2.init({
				client_id: this.config.googleConfiguration.clientId,
				cookiepolicy: 'single_host_origin',
				scope: 'profile email'
			});
			this.attachGoogleSignin(document.getElementById('googleSignInButton'));
		});
	}

	public attachGoogleSignin(element) {
		if (!element) { return; }
		this.auth2.attachClickHandler(element, {},
			(googleUser) => {
				const id_token = googleUser.getAuthResponse().id_token;
				if (id_token) {
					this.authService.login({ ticket: id_token, provider: LoginProviders.Google }).subscribe(
						res => this.onLogInSuccess(res),
						error => this.onLogInError(error)
					);
				}
			}, (error) => {
			});
	}



	/*
	* FACEBOOK SIGN IN
	*/


	private initialiseFacebookOauth(): void {
		FB.init({
			appId: this.config.facebookConfiguration.clientId,
			cookie: false,
			xfbml: true,
			version: 'v2.8'
		});
	}




	public facebookLogin() {
		FB.login((response: any) => {
			if (response.status === 'connected' || 'not_authorized') {
				this.authService.login({ ticket: response.authResponse.accessToken, provider: LoginProviders.Facebook }).subscribe(
					res => this.onLogInSuccess(res),
					error => this.onLogInError(error)
				);
			}
		}, { scope: 'user_friends,email' });
	}

	/*
   * LINKEDIN SIGN IN
   */

	public linkedinAuthorize() {
		window.location.href = this.config.linkedInConfiguration.oauthUrl + '?response_type=code&client_id=' + this.config.linkedInConfiguration.clientId + '&redirect_uri=' + this.config.linkedInConfiguration.redirectUri + '&state=987654321';
	}

	public linkedInInitialiseLogin() {
		this.router.navigate(['/login/linkedin']);
	}

	public linkedInloginUser(code: string) {
		this.authService.login({ ticket: code, provider: LoginProviders.LinkedIn }).subscribe(
			res => this.onLogInSuccess(res),
			error => this.onLogInError(error)
		);
	}

	/*
   * TWITTER SIGN IN
   */
	public twitterInitialiseLogin() {
		this.router.navigate(['/login/twitter']);
	}

	public twitterAuthorize() {
		let headers = new HttpHeaders();
		headers = headers.set('Content-Type', 'application/json');
		headers = headers.set('Accept', 'application/json');
		this.httpClient.get(environment.Server + 'auth/twitterRequestToken', { headers: headers }).subscribe((data: any) => {
			window.location.href = this.config.twitterConfiguration.oauthUrl + '?oauth_token=' + data.payload.value;
		});
	}

	public twitterLogin(token: string, verifier: string) {
		this.authService.login({ ticket: token, provider: LoginProviders.Twitter, data: verifier }).subscribe(
			res => this.onLogInSuccess(res),
			error => this.onLogInError(error)
		);
	}

	/*
  * B2ACCESS LOG IN
  */

	public b2AccessInitialiseLogin() {
		this.router.navigate(['/api/oauth/authorized/b2access']);
	}

	public b2AccessGetAuthCode() {
		window.location.href = this.config.b2accessConfiguration.oauthUrl + '?response_type=code&client_id=' + this.config.b2accessConfiguration.clientId + '&redirect_uri=' + this.config.b2accessConfiguration.redirectUri + '&state=987654321&scope=USER_PROFILE';
	}

	public b2AccessLogin(code: String) {
		let headers = new HttpHeaders();
		headers = headers.set('Content-Type', 'application/json');
		headers = headers.set('Accept', 'application/json');
		this.httpClient.post(environment.Server + 'auth/b2AccessRequestToken', { code: code }, { headers: headers })
			.subscribe((data: any) => {
				this.authService.login({ ticket: data.payload.accessToken, provider: LoginProviders.B2Accesss, data: null }).subscribe(
					res => this.onLogInSuccess(res),
					error => this.onLogInError(error)
				);
			});
	}


	/*
   * NATIVE LOGIN
   */

	public nativeLogin(credentials: Credential) {
		this.authService.nativeLogin(credentials).subscribe(
			res => this.onLogInSuccess(res),
			error => this.onLogInError(error)
		);
	}


	/*
   * LOGIN HANDLERS
   */


	public onLogInSuccess(logoutMessage: any) {
		this.snackBar.openFromComponent(SnackBarNotificationComponent, {
			data: { message: 'GENERAL.SNACK-BAR.SUCCESSFUL-LOGIN', language: this.language },
			duration: 3000,
		});
		if (this.authService.current().culture) { this.cultureService.cultureSelected(this.authService.current().culture); }
		const params = this.router['rawUrlTree'].queryParams;
		const redirectUrl = params['returnUrl'] ? params['returnUrl'] : '/';
		this.zone.run(() => this.router.navigate([redirectUrl]));
	}

	public onLogInError(errorMessage: string) {
		this.snackBar.openFromComponent(SnackBarNotificationComponent, {
			data: { message: 'GENERAL.SNACK-BAR.UNSUCCESSFUL-LOGIN', language: this.language },
			duration: 3000,
		});
	}
}