/**
 * @typedef {"light" | "dark"} EmbedThemeMode
 */

/**
 * Map external theme names to the two themes supported by iframe surfaces.
 *
 * @param {string | null | undefined} rawTheme
 * @returns {EmbedThemeMode}
 */
export function resolveEmbedThemeMode(rawTheme) {
  const theme = (rawTheme ?? "").trim().toLowerCase();
  return theme === "dark" ||
    theme === "dark-blue" ||
    theme === "深色" ||
    theme === "深蓝"
    ? "dark"
    : "light";
}