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

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

type LilaInfo = {
  key: string;
  name: string;
  totalChapters: number;
  totalVerses: number;
  chapters: ChapterInfo[];
};

export default async function CcVersePage({
  params,
}: {
  params: Promise<{ lila: string; chapter: string; verse: string }>;
}) {
  const { lila, chapter, verse } = await params;

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

  const lilas = meta.lilas as LilaInfo[] | undefined;
  const lilaInfo = lilas?.find((l) => l.key === lila);
  if (!lilaInfo) notFound();

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

  const verseIndex = await getChapterVerseIndex("cc", lila, parseInt(chapter));
  if (verseIndex.length === 0) notFound();

  const requestedVerse = parseInt(verse);
  const verseData = await getSingleVerse(
    "cc",
    lila,
    parseInt(chapter),
    requestedVerse,
  );
  if (!verseData) notFound();

  // Build mobile nav groups from verse index
  const mobileNavGroups: MobileNavGroup[] = [];
  if (verseIndex.length > 0) {
    mobileNavGroups.push({
      title: "Verses",
      items: verseIndex.map((v) => ({
        slug: String(v.verse),
        label: v.verseEnd
          ? `Verse ${chapter}.${v.verse}–${v.verseEnd}`
          : `Verse ${chapter}.${v.verse}`,
        href: `/books/cc/${lila}/${chapter}/${v.verse}`,
        type: "verse",
      })),
    });
  }

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

      <div className="w-full md:max-w-7xl mx-auto flex">
        <ChapterViewer
          initialVerse={verseData}
          initialVerseNum={requestedVerse}
          verseIndex={verseIndex.map((v) => ({
            verse: v.verse,
            verseEnd: v.verseEnd ?? undefined,
            reference: v.reference,
          }))}
          book="cc"
          division={lila}
          chapter={parseInt(chapter)}
          showBengali={true}
          basePath={`/books/cc/${lila}/${chapter}`}
          mobileNavGroups={mobileNavGroups}
          mobileNavBookTitle={`Chapter ${chapter}: ${chapterInfo.title}`}
        />
      </div>
    </div>
  );
}