import type { ActionFunctionArgs, LoaderFunctionArgs } from "react-router";
import {
  getArtistById,
  getArtistLinks,
  getIpAddress,
  updateArtist,
} from "~/lib/db.server";

export function loader({ params }: LoaderFunctionArgs) {
  const artist = getArtistById(params.uuid!);
  if (!artist) return Response.json({ error: "Not found" }, { status: 404 });
  const links = getArtistLinks(artist.id);
  return Response.json({ ...artist, links });
}

export async function action({ request, params }: ActionFunctionArgs) {
  if (request.method !== "PATCH") {
    return Response.json({ error: "Method not allowed" }, { status: 405 });
  }

  const artist = getArtistById(params.uuid!);
  if (!artist) return Response.json({ error: "Not found" }, { status: 404 });

  let body: Record<string, unknown>;
  try {
    body = await request.json();
  } catch {
    return Response.json({ error: "Invalid JSON body" }, { status: 400 });
  }

  const currentLinks = getArtistLinks(artist.id);
  const patchLinks = (body.links as { label: string; url: string }[] | undefined) ?? [];
  const appendLinks = body.append_links !== false;

  const existingUrls = new Set(currentLinks.map((l) => l.url));
  const newLinks = appendLinks
    ? [...currentLinks.map((l) => ({ label: l.label, url: l.url })), ...patchLinks.filter((l) => !existingUrls.has(l.url))]
    : patchLinks;

  updateArtist(artist.id, {
    slug: (body.slug as string | undefined) ?? artist.slug,
    name: (body.name as string | undefined) ?? artist.name,
    links: newLinks,
    message: (body.message as string | undefined) || "API update",
    ip_address: getIpAddress(request),
  });

  return Response.json(getArtistById(artist.id));
}

export default function () { return null; }
