/** @file
 * @author Edouard DUPIN
 * @copyright 2018, Edouard DUPIN, all right reserved
 * @license PROPRIETARY (see license file)
 */

import { Injectable, Output, EventEmitter, Inject } from '@angular/core';
import { Router } from '@angular/router';
import { Environment } from '../model/environment';
import { isNullOrUndefined } from '../utils';

export enum UserRoles222 {
	admin = 'admin',
	user = 'user',
	guest = 'guest',
}

@Injectable()
export class SessionService {
	private tokenJwt?: string;
	public userLogin?: string;
	public userId?: string;
	public applName?: string;
	public right: any = {};

	@Output() change: EventEmitter<boolean> = new EventEmitter();

	constructor(
		@Inject('ENVIRONMENT') environment: Environment,
	) {
		console.log("Start SessionService");
		this.applName = environment.applName;
	}

	/**
	 * @brief Create a new session.
	 *
	 * @param userId -
	 * @param userLogin -
	 * @param tokenJwt  -
	 */
	create({
		userId,
		userLogin,
		tokenJwt,
	}: {
		userId: string;
		userLogin: string;
		tokenJwt: string;
	}) {
		console.log(
			`Session Create: userId=${userId} userLogin=${userLogin} tokenJwt = ${tokenJwt}`
		);
		this.tokenJwt = tokenJwt;
		this.userId = userId;
		this.userLogin = userLogin;
		this.right = this.parseToken(tokenJwt);
		console.log(`Retrieve right: ${JSON.stringify(this.right, null, 4)}`);
		this.change.emit(true);
	}

	b64_to_utf8(str: string): string {
		return decodeURIComponent(window.atob(str));
	}
	parseToken(token: string): any {
		const cut = token.split('.');
		const decoded = this.b64_to_utf8(cut[1]);
		const jsonModel = JSON.parse(decoded);
		if (isNullOrUndefined(jsonModel.right)) {
			return {};
		}
		if (isNullOrUndefined(jsonModel.right[this.applName])) {
			return {};
		}
		return jsonModel.right[this.applName];
	}
	/**
	 * @brief destroy the current session.
	 */
	destroy() {
		console.log('Session REMOVE');
		this.tokenJwt = undefined;
		this.userId = undefined;
		this.userLogin = undefined;
		this.right = {};
		this.change.emit(false);
	}
	getToken(): string | undefined {
		return this.tokenJwt;
	}
	isLogged() {
		return this.userId !== null;
	}
	hasRight(type: UserRoles222): boolean {
		if (type === UserRoles222.admin) {
			if (isNullOrUndefined(this.right.ADMIN)) {
				return false;
			}
			return this.right.ADMIN;
		}
		if (type === UserRoles222.user) {
			if (isNullOrUndefined(this.right.USER)) {
				return false;
			}
			return this.right.USER;
		}
		if (type === UserRoles222.guest) {
			// all the other ... maybe unneeded
			return true;
		}
		return false;
	}
	hasNotRight(rightType: UserRoles222) {
		return !this.hasRight(rightType);
	}
	getLogin() {
		return this.userLogin;
	}
	getAvatar() {
		return 'assets/images/avatar_generic.svg';
		/* This is not ready:
		if(this.userAvatar === false) {
			return 'assets/images/avatar_generic.svg';
		}
		return this.userId;
		*/
	}
}

@Injectable()
export class OnlyUsersGuard {
	constructor(private sessionService: SessionService, private router: Router) { }

	canActivate() {
		console.log(`OnlyUsersGuard : ${this.sessionService}`)
		console.log('OnlyLoggedInUsers');
		if (this.sessionService.hasRight(UserRoles222.user)
			|| this.sessionService.hasRight(UserRoles222.admin)) {
			return true;
		}
		this.router.navigateByUrl('/forbidden');
		return false;
	}
}

@Injectable()
export class OnlyUsersGuardHome {
	constructor(private sessionService: SessionService, private router: Router) { }

	canActivate() {
		if (!this.sessionService.isLogged()) {
			this.router.navigateByUrl('/unregistered');
			return false;
		}
		if (this.sessionService.hasRight(UserRoles222.user)
			|| this.sessionService.hasRight(UserRoles222.admin)) {
			return true;
		}
		this.router.navigateByUrl('/forbidden');
		return false;
	}
}

@Injectable()
export class OnlyUnregisteredGuardHome {
	constructor(private sessionService: SessionService, private router: Router) { }

	canActivate() {
		if (this.sessionService.isLogged()) {
			this.router.navigateByUrl('/home');
			return false;
		}
		return true;
	}
}


@Injectable()
export class OnlyAdminGuard {
	constructor(private sessionService: SessionService, private router: Router) { }

	canActivate() {
		if (!this.sessionService.hasRight(UserRoles222.user)) {
			this.router.navigateByUrl('/forbidden');
			return false;
		}
		return true;
	}
}