import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { ActivatedRouteSnapshot } from '@angular/router';
import { Observable } from 'rxjs/Observable';

import { environment } from '../../../environments/environment';
import { KanbanBoard } from './kanban-board.model';

@Injectable()
export class KanbanService {
  private url = environment.apiUrl + '/api/kanban';

  private cachedKanbanBoard: KanbanBoard = new KanbanBoard();

  constructor(private httpService: HttpClient) {
  }

  /**
   * Returns an observable instance to the kanban board api
   *
   * @returns {Observable<KanbanBoard>}
   */
  public getList(): Observable<KanbanBoard> {
    return this.httpService.get<KanbanBoard>(this.url);
  }

  /**
   * Route preload resolver
   *
   * @param {ActivatedRouteSnapshot} route
   * @returns {Promise<KanbanBoard>}
   */
  public resolve(route: ActivatedRouteSnapshot): Promise<KanbanBoard | boolean> {
    return this.getList().toPromise().then(result => result ? result : false);
  }

  /**
   * Reload the board
   */
  public reload() {
    this.getList().subscribe(result => this.cachedKanbanBoard = result);
  }

  get kanbanBoard(): KanbanBoard {
    return this.cachedKanbanBoard;
  }

  set kanbanBoard(kanbanBoard: KanbanBoard) {
    this.cachedKanbanBoard = kanbanBoard;
  }
}