import { resolveThemeFromQuery } from "@/core/auth/external-login";

const DEFAULT_USERNAME = "guest";

export type EmbedChatParams = {
  /** Parent correlation id — required for status polling without thread_id. */
  sessionId: string;
  message: string;
  username: string;
  theme: string;
};

/**
 * Resolve iframe embed params from URL query only (plain iframe, not wujie).
 *
 * Parent must generate ``sessionId`` and pass it on the iframe URL so it can
 * poll ``GET /api/public/embed/sessions/{sessionId}/status`` without reading
 * the child frame.
 */
export function resolveEmbedChatParams(search: string): EmbedChatParams {
  const params = new URLSearchParams(search.startsWith("?") ? search : `?${search}`);

  const sessionId =
    params.get("sessionId")?.trim() ||
    params.get("session_id")?.trim() ||
    "";

  const message =
    params.get("message")?.trim() ||
    params.get("question")?.trim() ||
    params.get("text")?.trim() ||
    "";

  const username =
    params.get("username")?.trim() ||
    params.get("userName")?.trim() ||
    DEFAULT_USERNAME;

  const theme = params.get("theme")?.trim() || "";

  return { sessionId, message, username, theme };
}

export function resolveEmbedTheme(themeParam: string): "dark" | "light" {
  return resolveThemeFromQuery(themeParam || null);
}