import { Router } from "@oak/oak";
import type { APIResponse, ChatMessage } from "../model/interfaces.ts";
import { authMiddleware } from "../middleware/auth.ts";
import { getRecentChatMessages } from "../services/chat-service.ts";

const router = new Router({ prefix: "/api/chat" });

// GET /api/chat — recent messages (ascending). Optional `before` (ISO created_at)
// cursor loads the page of older messages, and `limit` caps the page size.
router.get("/", authMiddleware, (ctx) => {
  const params = ctx.request.url.searchParams;
  const before = params.get("before") ?? undefined;
  const limitParam = params.get("limit");
  const limit = limitParam ? Number(limitParam) : undefined;
  const messages = getRecentChatMessages(
    Number.isFinite(limit) ? limit : undefined,
    before,
  );
  const responseBody: APIResponse<ChatMessage[]> = {
    success: true,
    data: messages,
  };
  ctx.response.body = responseBody;
});

export default router;