import { HttpError } from "@/lib/errors";
import { readJson, route } from "@/lib/http";
import { categoryCounts, mutatePosts, readPosts, tagCounts } from "@/lib/store";
import { validatePost } from "@/lib/validate";

export const dynamic = "force-dynamic";

export const GET = route(async () => {
  const { posts, revision } = await readPosts();
  return Response.json({ posts, revision, categories: categoryCounts(posts), tags: tagCounts(posts) });
});

/** Body: { post: PostInput, revision? } */
export const POST = route(async (req) => {
  const body = await readJson<{ post?: unknown; revision?: string }>(req);
  const { post, errors } = validatePost(body.post);
  if (!post) throw new HttpError(400, "invalid post", errors);

  const { result, revision } = await mutatePosts(body.revision, (posts) => {
    if (posts.some((p) => p.slug === post.slug)) {
      throw new HttpError(409, `a post with slug "${post.slug}" already exists`);
    }
    const created = { id: Math.max(0, ...posts.map((p) => p.id)) + 1, ...post };
    posts.push(created);
    return created;
  });
  return Response.json({ post: result, revision }, { status: 201 });
});