export function createOpenAiService({ apiKey, baseUrl, timeoutMs = 60000, fetchImpl = fetch }) {
  return {
    async createChatCompletion(body) {
      const controller = new AbortController();
      const timeout = setTimeout(() => controller.abort(), timeoutMs);

      try {
        return await fetchImpl(`${baseUrl}/chat/completions`, {
          method: "POST",
          headers: {
            "authorization": `Bearer ${apiKey}`,
            "content-type": "application/json"
          },
          body: JSON.stringify(body),
          signal: controller.signal
        });
      } finally {
        clearTimeout(timeout);
      }
    }
  };
}