/*
 * API communication module. Centralizes fetch calls and service-worker
 * registration so network details stay out of rendering and state logic.
 */

import { API_BASE } from './constants.js';

/*
 * Generic JSON fetcher. All frontend API calls pass through this function so
 * error handling, header defaults, and base path are consistent everywhere.
 */
export async function fetchJson(path, options = {}) {
  const url = path.startsWith('http') ? path : `${API_BASE}${path}`;

  const requestOptions = {
    ...options,
    headers: {
      Accept: 'application/json',
      ...(options.headers || {})
    }
  };

  const response = await fetch(url, requestOptions);

  if (!response.ok) {
    let message = `Request failed for ${url}: ${response.status}`;

    try {
      const errorPayload = await response.json();

      if (errorPayload?.message) {
        message = errorPayload.message;
      }
    } catch {
      /* Ignore JSON parse errors for non-JSON responses. */
    }

    throw new Error(message);
  }

  return response.json();
}

export function registerServiceWorker() {
  if ('serviceWorker' in navigator) {
    navigator.serviceWorker.register('/sw.js').catch((error) => {
      console.error('Service worker registration failed', error);
    });
  }
}