import { defineWrappedResponseHandler } from "#server/utils/handler";
import { R } from "#server/utils/response";
import { resolveAgentIdentity } from "#server/service/agent/identity";
import { getSessionByIdAndUser, getMessagesBySession } from "#server/service/agent/session";
import { getAgentBySlug } from "#server/service/agent/agent";

export default defineWrappedResponseHandler(async (event) => {
  const agentSlug = getRouterParam(event, "agentSlug");
  const id = getRouterParam(event, "id");
  if (!agentSlug || !id) {
    return R.error("参数无效", null);
  }

  const agent = await getAgentBySlug(agentSlug);
  if (!agent) {
    return R.error("agent 不存在", null);
  }

  const identity = await resolveAgentIdentity(event);
  const session = await getSessionByIdAndUser(id, identity.userId, identity.tempToken);
  if (!session) {
    return R.error("会话不存在", null);
  }

  if (session.agentId !== agent.id) {
    return R.error("会话不属于该 agent", null);
  }

  const query = getQuery(event);
  const before = query.before ? Number(query.before) : undefined;
  const limit = Number(query.limit) || 50;

  const messages = await getMessagesBySession(id, { before, limit, userId: identity.userId });
  return R.success({ messages, hasMore: messages.length === limit });
});