export const runtime = "nodejs";

import { NextResponse } from "next/server";
import { z } from "zod";
import { requireSession } from "@/lib/auth/require";
import { listConversationsForUser, getOrCreateDirectConversation, createGroupConversation } from "@/lib/chat/service";

export async function GET() {
  const { session, response } = await requireSession();
  if (!session) return response;
  return NextResponse.json(await listConversationsForUser(session.user.id));
}

const schema = z.union([
  z.object({ peerId: z.string().min(1) }),
  z.object({ name: z.string().min(1), participantIds: z.array(z.string().min(1)).min(1) }),
]);

export async function POST(request: Request) {
  const { session, response } = await requireSession();
  if (!session) return response;

  const parsed = schema.safeParse(await request.json().catch(() => null));
  if (!parsed.success) {
    return NextResponse.json({ error: "Некорректные данные" }, { status: 400 });
  }

  if ("peerId" in parsed.data) {
    const conv = await getOrCreateDirectConversation(session.user.id, parsed.data.peerId);
    return NextResponse.json(conv, { status: 201 });
  }

  const conv = await createGroupConversation(session.user.id, parsed.data.participantIds, parsed.data.name);
  return NextResponse.json(conv, { status: 201 });
}