import { Injectable } from "@angular/core";
import {
  CanActivate,
  Router,
  ActivatedRouteSnapshot,
  RouterStateSnapshot,
} from "@angular/router";
import { IPermissionGuardModel } from "../model/permission-guard.model";
import { PermissionService } from "./permission.service";

@Injectable()
export class PermissionGuard implements CanActivate {
  constructor(
    private _permissionService: PermissionService,
    private router: Router
  ) {}

  canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot) {
    let data = route.data["Permission"] as IPermissionGuardModel;

    if (Array.isArray(data.Only) && Array.isArray(data.Except))
      throw "can't use both 'Only' and 'Except' in route data.";

    if (Array.isArray(data.Only)) {
      let hasDefined = this._permissionService.hasOneDefined(data.Only);
      if (hasDefined) return true;

      if (data.RedirectTo && data.RedirectTo !== undefined)
        this.router.navigate([data.RedirectTo]);

      return false;
    }

    if (Array.isArray(data.Except)) {
      let hasDefined = this._permissionService.hasOneDefined(data.Except);
      if (!hasDefined) return true;

      if (data.RedirectTo && data.RedirectTo !== undefined)
        this.router.navigate([data.RedirectTo]);

      return false;
    }

    return false;
  }
}