import { Injectable } from '@angular/core';
import { Location } from '@angular/common';
import { ActivatedRouteSnapshot, RouterStateSnapshot } from '@angular/router';
import { CanActivate } from '@angular/router';

import { UserService } from './user.service';
import { AuthService } from './auth.service';

import { environment } from './../../environments/environment';
import { AppStorageService } from './../common/app-storage.service';
import { AppConstants } from './../../common/AppConstants';


@Injectable()
export class RouteGuard implements CanActivate {
    constructor(private userService: UserService, private authService: AuthService,
        private appStorageService: AppStorageService) {

    }

    getAuthURLWithoutHistory(): string {
        const state = this.generateState();
        if (!location.hash) {
            this.appStorageService.set<String>(AppConstants.ReturnUrl, '/');
        }
        const locale = this.appStorageService.get<String>(AppConstants.LOCALE);
        const authURL = this.authService.getAuthorizeUrl(locale.toString(), state);
        console.log('Auth URL ', authURL);
        return authURL;
    }

    getAuthURL(): string {
        const state = this.generateState();
        if (location.hash && location.hash !== '#/' && location.hash !== '#') {
            const url = location.href ? location.href : '/';
            this.appStorageService.set<String>(AppConstants.ReturnUrl, url);
            console.log('Setting Return URL to ', url);
        }
        const locale = this.appStorageService.get<String>(AppConstants.LOCALE);
        const authURL = this.authService.getAuthorizeUrl(locale.toString(), state);
        console.log('Auth URL ', authURL);
        return authURL;
    }

    canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean {
        if (environment.envName !== 'test') {
            if (!this.userService.isAuthenticated) {
                location.assign(this.getAuthURL());
            } else {
                return true;
            }
        } else if (environment.envName === 'test' && this.userService.isAuthenticated) {
            return true;
        }
    }

    private generateState(): string {
        const chars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
        const length = 5;
        let result = '';
        for (let i = length; i > 0; --i) {
          result += chars[Math.round(Math.random() * (chars.length - 1))];
        }
        return result;
    }
}