/**
 * Helper for fetching comment counts in bulk and keying them by post slug.
 * Used by overview components (BlogOverview, PostOverviewBlock) so each
 * render fires a single `/api/comments/counts?ids=…` request instead of
 * one request per card.
 */

import { env } from "$env/dynamic/public";
import type { PostEntry } from "$lib/cms";

export type CommentCountsMap = Record<string, number>;

/** Strip the leading slash so it matches `params.slug` (= comment page_id). */
export function postSlugForComments(p: PostEntry): string {
  const raw = (p as { slug?: string; _slug?: string }).slug ?? p._slug ?? "";
  return raw.replace(/^\//, "").trim();
}

/**
 * Bulk-fetch approved comment counts for many posts. Returns a map
 * `{ slug: count }` (slug as in `postSlugForComments`). Missing or failed
 * responses resolve to an empty object — callers can then `?? null` per slug.
 */
export async function fetchCommentCounts(
  slugs: string[],
  options?: { environment?: string; signal?: AbortSignal },
): Promise<CommentCountsMap> {
  const cleaned = slugs.filter(Boolean);
  if (cleaned.length === 0) return {};
  const cmsBase = (
    env.PUBLIC_CMS_URL ||
    import.meta.env.PUBLIC_CMS_URL ||
    ""
  ).replace(/\/$/, "");
  if (!cmsBase) return {};
  const url = new URL(`${cmsBase}/api/comments/counts`);
  url.searchParams.set("ids", cleaned.join(","));
  if (options?.environment) {
    url.searchParams.set("_environment", options.environment);
  }
  try {
    const r = await fetch(url.toString(), { signal: options?.signal });
    if (!r.ok) return {};
    const d = (await r.json()) as { counts?: CommentCountsMap };
    return d?.counts ?? {};
  } catch {
    return {};
  }
}