import { normalizeFontId } from "./theme-core.js";

/** Префикс путей к ассетам (корень "" или "../" на страницах cases/*). */
export function getAssetPrefix() {
  const link = document.querySelector('link[rel="stylesheet"][href*="css/main.css"]');
  if (link) {
    const href = link.getAttribute("href") || "";
    const marker = "css/main.css";
    const idx = href.lastIndexOf(marker);
    if (idx !== -1) return href.slice(0, idx);
  }
  const p = window.location.pathname || "";
  if (p.includes("/cases/")) return "../";
  return "";
}

export function themeFontStylesheetHref(fontId) {
  const id = normalizeFontId(fontId);
  return `${getAssetPrefix()}assets/fonts/${id}.css`;
}

export function ensureThemeFontLoaded(fontId) {
  const id = normalizeFontId(fontId);
  const href = themeFontStylesheetHref(id);
  if (!href) return;
  if (document.querySelector(`link[data-theme-font="${id}"]`)) return;

  const link = document.createElement("link");
  link.rel = "stylesheet";
  link.href = href;
  link.dataset.themeFont = id;
  document.head.appendChild(link);
}