import Link from "next/link";
import { PageHeader } from "@/components/page-header";
import { notFound } from "next/navigation";
import { getBookMeta, getChapterVerses, getChapterVerseIndex } from "@/lib/api";
import { ChapterViewer } from "@/app/books/chapter-viewer";

type ChapterInfo = {
  number: number;
  title: string;
  totalVerses: number;
};

type CantoInfo = {
  number: number;
  title: string;
  totalChapters: number;
  chapters: ChapterInfo[];
};

export default async function SbChapterPage({
  params,
}: {
  params: Promise<{ canto: string; chapter: string }>;
}) {
  const { canto, chapter } = await params;
  const PAGE_SIZE = 20;

  const meta = await getBookMeta("sb");
  if (!meta) notFound();

  const cantos = (meta as unknown as { cantos: CantoInfo[] }).cantos;
  const cantoInfo = cantos.find((c) => c.number === parseInt(canto));
  if (!cantoInfo) notFound();

  const chapterInfo = cantoInfo.chapters.find(
    (ch) => ch.number === parseInt(chapter),
  );
  if (!chapterInfo) notFound();

  const [verseIndex, firstPage] = await Promise.all([
    getChapterVerseIndex("sb", canto, parseInt(chapter)),
    getChapterVerses("sb", canto, parseInt(chapter), 1, PAGE_SIZE),
  ]);
  if (verseIndex.length === 0) notFound();

  return (
    <div className="min-h-screen bg-background">
      <PageHeader sticky wide>
        <Link
          href={`/books/sb/${canto}`}
          className="text-sm text-muted-foreground hover:text-foreground"
        >
          &larr; Canto {cantoInfo.number}: {cantoInfo.title}
        </Link>
        <h1 className="mt-2 text-2xl font-bold text-foreground">
          Chapter {chapter}: {chapterInfo.title}
        </h1>
      </PageHeader>

      <div className="w-full md:max-w-5xl mx-auto flex">
        <ChapterViewer
          initialVerses={firstPage.verses}
          hasMore={firstPage.hasMore}
          totalPages={firstPage.totalPages}
          book="sb"
          division={canto}
          chapter={parseInt(chapter)}
          limit={PAGE_SIZE}
          showBengali={false}
          verseIndex={verseIndex.map((v) => ({
            verse: v.verse,
            verseEnd: v.verseEnd ?? undefined,
            reference: v.reference,
          }))}
        />
      </div>
    </div>
  );
}