// Gradium plugin module implements shared behavior.
const DEFAULT_GRADIUM_BASE_URL = "https://api.gradium.ai";
export const GRADIUM_API_HOSTNAME = "api.gradium.ai";
export const DEFAULT_GRADIUM_VOICE_ID = "YTpq7expH9539ERJ";

export const GRADIUM_VOICES = [
  { id: "YTpq7expH9539ERJ", name: "Emma" },
  { id: "LFZvm12tW_z0xfGo", name: "Kent" },
  { id: "Eu9iL_CYe8N-Gkx_", name: "Tiffany" },
  { id: "2H4HY2CBNyJHBCrP", name: "Christina" },
  { id: "jtEKaLYNn6iif5PR", name: "Sydney" },
  { id: "KWJiFWu2O9nMPYcR", name: "John" },
  { id: "3jUdJyOi9pgbxBTK", name: "Arthur" },
] as const;

export function normalizeGradiumBaseUrl(baseUrl?: string): string {
  const raw = baseUrl?.trim() || DEFAULT_GRADIUM_BASE_URL;
  let url: URL;
  try {
    url = new URL(raw);
  } catch {
    throw new Error("Gradium baseUrl must be a valid https URL");
  }

  url.username = "";
  url.password = "";
  url.search = "";
  url.hash = "";

  if (url.protocol !== "https:") {
    throw new Error("Gradium baseUrl must use https");
  }
  if (url.hostname.toLowerCase() !== GRADIUM_API_HOSTNAME) {
    throw new Error("Gradium baseUrl must target api.gradium.ai");
  }

  return url.toString().replace(/\/+$/, "");
}