blog-post-state.service.ts

import { Injectable } from '@angular/core';

import { BehaviorSubject, Observable } from 'rxjs';

import { BlogPostService } from '@app/core/services';
import { MODE } from '@app/companies/components';
import { IBlogPost, ICompany, ICountry, IOrganization } from '@lib/models';

@Injectable()
export class BlogPostStateService {
  private _getMode$ = new BehaviorSubject<string>(MODE.show);

  /**
   * Initial state of blog, needs in reset case, should be updated after save changes.
   */
  private _initBlog$ = new BehaviorSubject<IBlogPost>(null);

  /**
   * Current state of blog, needs for "edit" and "preview" modes.
   */
  private _draftBlog$ = new BehaviorSubject<IBlogPost>(null);

  constructor(private _blogPostService: BlogPostService) {}

  public get isEditable() {
    return this._isEditMode() || this._isNewMode();
  }

  public get initBlog$(): Observable<IBlogPost> {
    return this._initBlog$.asObservable();
  }

  /**
   * Get value of current state of blog.
   */
  public get draftBlog$(): Observable<IBlogPost> {
    return this._draftBlog$.asObservable();
  }

  public get mode$(): Observable<string> {
    return this._getMode$.asObservable();
  }

  public setMode(mode: string) {
    this._getMode$.next(mode);
  }

  public createBlog$(companyId, blog: IBlogPost): Observable<IBlogPost> {
    return this._blogPostService.create(companyId, blog);
  }

  public updateBlog$(id, companyId, blogData: IBlogPost): Observable<IBlogPost> {
    return this._blogPostService.update(id, companyId, blogData);
  }

  public setInitBlog(blog: IBlogPost) {
    this._initBlog$.next(blog);
  }

  public getInitBlogValue(): IBlogPost {
    return this._initBlog$.value;
  }

  public getDraftBlogValue(): IBlogPost {
    return this._draftBlog$.value;
  }

  public setDraftBlog(blog: IBlogPost) {
    this._draftBlog$.next(blog);
  }

  public createEmptyBlog(parentId?: string, parentType?): IBlogPost {
    return {
      id: null,
      title: '',
      coverImage: '',
      preamble: '',
      content: '',
      parent: <ICompany>{ id: parentId } || <IOrganization>{} || <ICountry>{},
      parentType: parentType,
      published: true,
      featured: true,
    };
  }

  /**
   * Check current mode. Set true if current edit mode.
   */
  private _isEditMode() {
    return this._getMode$.value === MODE.edit;
  }

  /**
   * Check current mode. Set true if current new mode.
   */
  private _isNewMode() {
    return this._getMode$.value === MODE.new;
  }
}