import { prisma } from "@/lib/prisma";

const BASE_URL = `${process.env.FEED_URL}`

function escapeXml(value: string): string {
  return value
    .replace(/&/g, "&")
    .replace(/</g, "&lt;")
    .replace(/>/g, "&gt;")
    .replace(/"/g, "&quot;")
    .replace(/'/g, "&apos;");
}

export async function GET() {
  const items = await prisma.artwork.findMany({
    where: { published: true },
    orderBy: { createdAt: "desc" },
    take: 10,
    select: {
      id: true,
      name: true,
      description: true,
      altText: true,
      createdAt: true,
      updatedAt: true,
    },
  });

  const lastBuildDate =
    items[0]?.updatedAt?.toUTCString() ?? new Date().toUTCString();

  const itemXml = items
    .map((item) => {
      const title = escapeXml(item.name || "Artwork");
      const description = escapeXml(
        item.description || item.altText || item.name || "Artwork"
      );
      const link = `${BASE_URL}/artworks/single/${item.id}`;
      const pubDate = item.createdAt.toUTCString();

      return [
        "<item>",
        `<title>${title}</title>`,
        `<link>${link}</link>`,
        `<guid isPermaLink="true">${link}</guid>`,
        `<description>${description}</description>`,
        `<pubDate>${pubDate}</pubDate>`,
        "</item>",
      ].join("");
    })
    .join("");

  const xml = [
    '<?xml version="1.0" encoding="UTF-8"?>',
    '<rss version="2.0">',
    "<channel>",
    "<title>Gaertan Art - Latest Artworks</title>",
    `<link>${BASE_URL}</link>`,
    "<description>Ten newest artworks from Gaertan Art.</description>",
    `<lastBuildDate>${lastBuildDate}</lastBuildDate>`,
    itemXml,
    "</channel>",
    "</rss>",
  ].join("");

  return new Response(xml, {
    headers: {
      "Content-Type": "application/rss+xml; charset=utf-8",
    },
  });
}