import { Injectable } from '@angular/core';
import { 
        CanActivate,
        CanActivateChild,
        CanLoad,
        Router,
        ActivatedRouteSnapshot,
        RouterStateSnapshot } from '@angular/router';
import { AuthService } from '../services';

@Injectable()
export class AuthGuard implements CanActivate, CanActivateChild, CanLoad{

    constructor(protected router: Router, protected auth: AuthService){}

    canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean{

        /**
         * if user is logged in,
         * proceed
         */
        if(this.auth.check()){
            return true;
        }
        
        /**
         * if user is NOT logged in,
         * navigate to 'sign-in'
         */
        this.auth.intendedUrl = state.url;
        this.router.navigate(['sign-in']);
        return false;
    }
    
    canActivateChild(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean{
        return this.canActivate(route, state);
    }
}