import { prisma } from "@/lib/db";
import { signUrl } from "@/lib/r2";
import { decodeId } from "@/lib/hashids";
import { withGuards } from "@/lib/api-guards";

export const GET = withGuards(
  { rateLimit: { key: "pages", limit: 300, windowMs: 60_000 } },
  async (request) => {
    const { searchParams } = new URL(request.url);
    const chapterId = decodeId(searchParams.get("chapter") ?? "");
    const offset = Math.max(parseInt(searchParams.get("offset") ?? "0", 10), 0);
    const limit = Math.min(
      Math.max(parseInt(searchParams.get("limit") ?? "7", 10), 1),
      20
    );

    if (chapterId === null) {
      return Response.json({ error: "Missing chapter" }, { status: 400 });
    }

    const pages = await prisma.page.findMany({
      where: { chapterId },
      orderBy: { number: "asc" },
      skip: offset,
      take: limit,
      select: { number: true, imageUrl: true },
    });

    const signedPages = await Promise.all(
      pages.map(async (p) => ({
        number: p.number,
        imageUrl: await signUrl(p.imageUrl),
      }))
    );

    return Response.json(signedPages);
  }
);