import { HttpClient, HttpHeaders, HttpParams } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { Observable } from 'rxjs/internal/Observable';
import { catchError } from 'rxjs/operators';

import { ErrorLoggerService } from '../core/error-logger.service';

import { GuestBook } from './guest-book';
import { GuestBookList } from './guest-book-list';

const httpOptions = {
  headers: new HttpHeaders({ 'Content-Type': 'application/json' }),
};

const url = '/api/guest-book';
const serviceName = 'GuestBookService';

@Injectable({ providedIn: 'root' })
export class GuestBookService {
  constructor(private http: HttpClient, private log: ErrorLoggerService) {}

  get(id: string): Observable<GuestBook> {
    const getUrl: string = id === null ? url : `${url}/${id}`;
    return <Observable<GuestBook>>(
      this.http
        .get<GuestBook>(getUrl)
        .pipe(catchError(this.log.handleError(serviceName, `get id=${id}`)))
    );
  }

  list(date: string): Observable<GuestBookList> {
    const options = { params: new HttpParams().set('q', date === null ? '' : date) };
    return <Observable<GuestBookList>>(
      this.http
        .get<GuestBookList>(`${url}/list`, options)
        .pipe(catchError(this.log.handleError(serviceName, 'list')))
    );
  }

  save(guestBook: GuestBook): Observable<GuestBook> {
    return <Observable<GuestBook>>(
      this.http
        .post<GuestBook>(url, guestBook, httpOptions)
        .pipe(catchError(this.log.handleError(serviceName, 'save')))
    );
  }

  update(guestBook: GuestBook): Observable<GuestBook> {
    return <Observable<GuestBook>>(
      this.http
        .put<GuestBook>(`${url}/${guestBook.id}`, guestBook, httpOptions)
        .pipe(catchError(this.log.handleError(serviceName, 'update')))
    );
  }

  saveOrUpdate(guestBook: GuestBook): Observable<GuestBook> {
    if (!guestBook.id) {
      return this.save(guestBook);
    }
    return this.update(guestBook);
  }

  delete(id: string): Observable<GuestBook> {
    return <Observable<GuestBook>>(
      this.http
        .delete<GuestBook>(`${url}/${id}`, httpOptions)
        .pipe(catchError(this.log.handleError(serviceName, 'delete')))
    );
  }
}