import { notFound } from "next/navigation";
import { prisma } from "@/lib/db";
import { PageReader } from "@/components/PageReader";
import { encodeId } from "@/lib/hashids";
import type { Metadata } from "next";

type Props = {
  params: Promise<{ slug: string; chapter: string }>;
  searchParams: Promise<{ resume?: string }>;
};

export async function generateMetadata({
  params,
}: {
  params: Promise<{ slug: string; chapter: string }>;
}): Promise<Metadata> {
  const { slug, chapter } = await params;
  const chapterNum = parseInt(chapter, 10);
  if (isNaN(chapterNum)) return { title: "Not Found" };

  const manga = await prisma.manga.findUnique({ where: { slug } });
  if (!manga) return { title: "Not Found" };

  return {
    title: `${manga.title} — Ch. ${chapterNum}`,
    description: `Read chapter ${chapterNum} of ${manga.title}`,
  };
}

export default async function ChapterReaderPage({
  params,
  searchParams,
}: Props) {
  const { slug, chapter } = await params;
  const { resume } = await searchParams;
  const chapterNum = parseInt(chapter, 10);
  if (isNaN(chapterNum)) notFound();

  const [manga, initialChapterMeta] = await Promise.all([
    prisma.manga.findUnique({
      where: { slug },
      include: {
        chapters: {
          orderBy: { number: "asc" },
          include: {
            _count: { select: { pages: true } },
          },
        },
      },
    }),
    prisma.page.findMany({
      where: { chapter: { number: chapterNum, manga: { slug } } },
      orderBy: { number: "asc" },
      select: { number: true, width: true, height: true },
    }),
  ]);

  if (!manga) notFound();

  const currentChapter = manga.chapters.find((c) => c.number === chapterNum);
  if (!currentChapter) notFound();

  const allChapters = manga.chapters.map((c) => ({
    id: encodeId(c.id),
    number: c.number,
    title: c.title,
    totalPages: c._count.pages,
  }));

  return (
    <PageReader
      mangaSlug={manga.slug}
      mangaTitle={manga.title}
      startChapterNumber={currentChapter.number}
      chapters={allChapters}
      initialChapterMeta={initialChapterMeta}
      resume={resume === "1"}
    />
  );
}