import type { Health, MintDetail, MintListItem, Stats } from '@cashumints/shared';

/**
 * Build-time API base. Islands use PUBLIC_API_BASE (see api-client.ts) so the browser
 * can be pointed at a different origin than the build machine.
 */
export const API_URL = import.meta.env['API_URL'] ?? process.env['API_URL'] ?? 'http://127.0.0.1:8787';

async function get<T>(path: string): Promise<T> {
  const res = await fetch(`${API_URL}${path}`, { headers: { Accept: 'application/json' } });
  if (!res.ok) throw new Error(`${path} responded ${res.status}`);
  return (await res.json()) as T;
}

/**
 * Build-time fetches. A failure here fails the build on purpose: shipping a site with
 * an empty mint list would be worse than not shipping.
 */
export const fetchMints = (): Promise<MintListItem[]> => get<MintListItem[]>('/api/mints');
export const fetchMint = (host: string): Promise<MintDetail> =>
  get<MintDetail>(`/api/mints/${encodeURIComponent(host)}`);
export const fetchStats = (): Promise<Stats> => get<Stats>('/api/stats');

/** Health is allowed to be down at build time: the ticker just renders without it. */
export async function fetchHealth(): Promise<Health | null> {
  try {
    return await get<Health>('/api/health');
  } catch {
    return null;
  }
}

/**
 * Browser-facing API origin baked into the prerendered markup. Empty means same origin:
 * icons resolve to /icons on whatever host serves the page, which the dev server proxy
 * and the nginx config in the README both forward to the API. Never fall back to
 * API_URL here — that is a build-machine address (127.0.0.1) and a visitor's browser
 * cannot reach it. Set PUBLIC_API_URL only when the API lives on its own origin.
 */
export const PUBLIC_API_URL = process.env['PUBLIC_API_URL'] ?? '';

/** URL for a cached mint icon, or null. */
export function iconUrl(icon: string | null): string | null {
  return icon ? `${PUBLIC_API_URL}${icon}` : null;
}