frontend/src/app/service/page.service.ts

import {Host, Injectable} from '@angular/core';
import {Observable} from 'rxjs';
import PageRecord from '../structures/PageRecord';
import {ApiService} from './api.service';
import HostRecord from '../structures/HostRecord';

@Injectable({
  providedIn: 'root'
})
export class PageService {

  constructor(
      protected api: ApiService,
  ) { }

  load(id: string): Observable<PageRecord> {
    return new Observable<PageRecord>(sub => {
      this.api.get(`/page/${id}`).subscribe(response => {
        if ( response.status === 200 ) {
          sub.next(new PageRecord(response.data));
          sub.complete();
        } else {
          throw new Error(response.message);
        }
      });
    });
  }

  save(page: PageRecord): Observable<PageRecord> {
    return new Observable<PageRecord>(sub => {
      this.api.post(`/page/${page.UUID}/save`, page.toSave()).subscribe(res => {
        sub.next(new PageRecord(res.data));
        sub.complete();
      });
    });
  }

  get_nodes(page: PageRecord): Observable<Array<HostRecord>> {
    return new Observable<Array<HostRecord>>(sub => {
      this.api.get(`/page/${page.UUID}/nodes`).subscribe(res => {
        const returns = [];
        res.data.forEach(rec => {
          const host = new HostRecord(rec.Value.Value);
          host.load(rec);
          returns.push(host);
        });

        sub.next(returns);
        sub.complete();
      });
    });
  }

  save_nodes(page: PageRecord, nodes: Array<HostRecord>): Observable<Array<HostRecord>> {
    return new Observable<Array<HostRecord>>(sub => {
      nodes = nodes.map(x => {
        x.PageId = page.UUID;
        return x.toSave();
      });

      this.api.post(`/page/${page.UUID}/nodes/save`, nodes).subscribe(res => {
        const returns = [];
        res.data.forEach(rec => {
          const host = new HostRecord(rec.Value.Value);
          host.load(rec);
          returns.push(host);
        });

        sub.next(returns);
        sub.complete();
      });
    });
  }
}