const BASE = "https://api.stlouisfed.org/fred";

export async function fredFetch(
  endpoint: string,
  params: Record<string, any>,
  apiKey: string
) {
  const url = new URL(`${BASE}/${endpoint}`);
  url.searchParams.set("api_key", apiKey);
  url.searchParams.set("file_type", "json");
  for (const [k, v] of Object.entries(params)) {
    if (v === undefined || v === null || v === "") continue;
    url.searchParams.set(k, String(v));
  }
  const res = await fetch(url.toString());
  if (!res.ok) {
    const txt = await res.text();
    throw new Error(`FRED ${res.status}: ${txt.slice(0, 500)}`);
  }
  return res.json();
}

// small helper to prune empty keys
export function clean<T extends Record<string, any>>(o: T): Partial<T> {
  const r: any = {};
  for (const [k, v] of Object.entries(o)) if (v !== undefined && v !== null && v !== "") r[k] = v;
  return r;
}

const BASE = "https://api.stlouisfed.org/fred";

export async function fredFetch(
  endpoint: string,
  params: Record<string, any>,
  apiKey: string
) {
  const url = new URL(`${BASE}/${endpoint}`);
  url.searchParams.set("api_key", apiKey);
  url.searchParams.set("file_type", "json");
  for (const [k, v] of Object.entries(params)) {
    if (v === undefined || v === null || v === "") continue;
    url.searchParams.set(k, String(v));
  }
  const res = await fetch(url.toString());
  if (!res.ok) {
    const txt = await res.text();
    throw new Error(`FRED ${res.status}: ${txt.slice(0, 500)}`);
  }
  return res.json();
}

// small helper to prune empty keys
export function clean<T extends Record<string, any>>(o: T): Partial<T> {
  const r: any = {};
  for (const [k, v] of Object.entries(o)) if (v !== undefined && v !== null && v !== "") r[k] = v;
  return r;
}