/** Stored API origin; trailing slashes stripped so paths join cleanly. */
export function apiBaseUrl(): string {
  return (localStorage.getItem("apiBase") || "").replace(/\/+$/, "");
}

export function apiUrl(path: string): string {
  const b = apiBaseUrl();
  const p = path.startsWith("/") ? path : `/${path}`;
  return b ? `${b}${p}` : p;
}

export async function apiGet<T>(path: string): Promise<T> {
  const r = await fetch(apiUrl(path));
  if (!r.ok) {
    throw new Error(await r.text());
  }
  return r.json() as Promise<T>;
}

export async function apiPost<T>(path: string, body: unknown): Promise<T> {
  const r = await fetch(apiUrl(path), {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(body),
  });
  if (!r.ok) {
    throw new Error(await r.text());
  }
  return r.json() as Promise<T>;
}

export type SessionInfo = {
  usedBytes: number;
  maxBytes: number;
  lines: number;
  full: boolean;
  deepCapture: boolean;
};

export type Status = {
  app: string;
  uptimeMs: number;
  freeHeap: number;
  wifiMode: number;
  pn532?: { ic: number; fwHi: number; fwLo: number };
  scanning: boolean;
  session?: SessionInfo;
};

export type Tag = {
  uid: string;
  uidLen: number;
  atqa: number;
  sak: number;
  typeHint: number;
  /** ATQA as 4 hex digits (MSB first, same as firmware). */
  atqaHex?: string;
  sakHex?: string;
  typeGuess?: string;
  /** PN532 `GetGeneralStatus` payload bytes (chip-dependent length). */
  pn532GeneralStatus?: number[];
};