import { HttpClient, HttpHeaders, httpResource, HttpResourceRef } from '@angular/common/http';
import { Injectable, Signal, inject } from '@angular/core';
import { Observable } from 'rxjs';
import { catchError } from 'rxjs/operators';

import { Customer } from '../core/customer';
import { ErrorLoggerService } from '../core/error-logger.service';
import { PagedResult } from '../core/paged-result';

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

@Injectable({
  providedIn: 'root',
})
export class CustomerService {
  private http = inject(HttpClient);
  private log = inject(ErrorLoggerService);

  get(id: Signal<string | null> | string | null): HttpResourceRef<Customer | undefined> {
    return httpResource<Customer>(() => {
      const idVal = typeof id === 'function' ? id() : id;
      return idVal === null || idVal === undefined ? url : `${url}/${idVal}`;
    });
  }

  list(q: string | null, page = 0, size = 50, field = 'name', direction = 'asc'): Observable<PagedResult<Customer>> {
    const params = {
      ...(q ? { q } : {}),
      p: page,
      s: size,
      f: field,
      d: direction,
    };
    return this.http
      .get<PagedResult<Customer>>(`${url}/list`, { params })
      .pipe(catchError(this.log.handleError(serviceName, 'list'))) as Observable<PagedResult<Customer>>;
  }

  query(
    q: Signal<string>,
    p: Signal<number>,
    s: Signal<number>,
    f: Signal<string>,
    d: Signal<string>,
  ): HttpResourceRef<PagedResult<Customer> | undefined> {
    return httpResource<PagedResult<Customer>>(() => {
      return {
        url: `${url}/list`,
        params: {
          q: q(),
          p: p(),
          s: s(),
          f: f(),
          d: d(),
        },
      };
    });
  }

  save(customer: Customer): Observable<Customer> {
    return this.http
      .post<Customer>(`${url}`, customer, httpOptions)
      .pipe(catchError(this.log.handleError(serviceName, 'save'))) as Observable<Customer>;
  }

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

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

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

  autocomplete(query: Signal<string | null> | string | null): HttpResourceRef<Customer[] | undefined> {
    return httpResource<Customer[]>(() => {
      const qVal = typeof query === 'function' ? query() : query;
      return `${url}/query?q=${qVal ?? ''}`;
    });
  }
}