fix: og image generation

app/other-documents/[slug]/[chapter]/page.tsx

@@ -1,5 +1,6 @@
 export const dynamic = "force-dynamic";
 
+import type { Metadata } from "next";
 import Link from "next/link";
 import { notFound } from "next/navigation";
 import {
@@ -9,6 +10,7 @@ import {
   slugToBookCode,
   type OtherDocumentSidebarItem,
 } from "@/lib/other-documents";
+import { ogForOtherDocument, extractQuoteFromHl, buildOgMeta } from "@/lib/og";
 import { PageHeader } from "@/components/page-header";
 import { Card, CardContent } from "@/components/ui/card";
 import { buttonVariants } from "@/components/ui/button";
@@ -16,6 +18,38 @@ import { ChevronLeft, ChevronRight } from "lucide-react";
 import { cn } from "@/lib/utils";
 import { MobileNav, type MobileNavGroup } from "@/components/mobile-nav";
 
+// ---------------------------------------------------------------------------
+// Metadata
+// ---------------------------------------------------------------------------
+
+export async function generateMetadata({
+  params,
+  searchParams,
+}: {
+  params: Promise<{ slug: string; chapter: string }>;
+  searchParams: Promise<Record<string, string | string[] | undefined>>;
+}): Promise<Metadata> {
+  const { slug, chapter: chapterSlug } = await params;
+  const sp = await searchParams;
+  const bookCode = slugToBookCode(slug);
+
+  const quote = extractQuoteFromHl(sp);
+  if (quote) {
+    const meta = await getOtherDocumentMeta(bookCode);
+    const content = await getOtherDocumentContent(bookCode, chapterSlug);
+    const title = meta?.title ?? slug;
+    const detail = content?.title ?? `Chapter ${chapterSlug}`;
+    return buildOgMeta({ title, detail, quote });
+  }
+
+  const [meta, content] = await Promise.all([
+    getOtherDocumentMeta(bookCode),
+    getOtherDocumentContent(bookCode, chapterSlug),
+  ]);
+
+  return ogForOtherDocument(meta?.title ?? slug, content?.title ?? undefined);
+}
+
 // ---------------------------------------------------------------------------
 // Page
 // ---------------------------------------------------------------------------