import { useEffect, useState } from "react";
import { GATEWAY } from "./api";

export interface Health {
  gateway: boolean;
  persisted: boolean; // Postgres 是否在线（billing.persisted）
}

// useHealth 轮询 Gateway 健康（billing 端点同时回报持久化是否就绪）。
// NATS/Milvus/Neo4j 暂未由网关透出，UI 以"未知"呈现（规划：加 /health 聚合）。
export function useHealth(intervalMs = 4000): Health {
  const [h, setH] = useState<Health>({ gateway: false, persisted: false });
  useEffect(() => {
    let alive = true;
    const ping = async () => {
      try {
        const res = await fetch(`${GATEWAY}/api/v1/billing`);
        const data = (await res.json()) as { persisted?: boolean };
        if (alive) setH({ gateway: res.ok, persisted: Boolean(data.persisted) });
      } catch {
        if (alive) setH({ gateway: false, persisted: false });
      }
    };
    ping();
    const id = setInterval(ping, intervalMs);
    return () => {
      alive = false;
      clearInterval(id);
    };
  }, [intervalMs]);
  return h;
}