import { fail, handleOptions, json } from "../_shared/http.ts";
import { requireUser } from "../_shared/supabase.ts";

Deno.serve(async (req) => {
  const preflight = handleOptions(req);
  if (preflight) return preflight;

  if (req.method !== "POST") return fail("Method not allowed", 405);

  const { client, user, error: userError } = await requireUser(req);
  if (!user) return fail(userError ?? "Unauthorized", 401);

  let body: { channel_id?: string; content?: string };
  try {
    body = await req.json();
  } catch {
    return fail("Invalid JSON body");
  }

  const channelId = body.channel_id;
  const content = (body.content ?? "").trim();

  if (!channelId) return fail("channel_id is required");
  if (!content) return fail("content is required");
  if (content.length > 4000) return fail("content is too long");

  const { data: message, error } = await client
    .from("messages")
    .insert({
      channel_id: channelId,
      author_user_id: user.id,
      content,
    })
    .select("id, channel_id, author_user_id, content, created_at, edited_at, deleted_at")
    .single();

  if (error) {
    if (error.code === "42501") return fail("forbidden", 403);
    return fail(error.message, 400);
  }

  return json({ message }, 201);
});