import { useEffect, useRef } from "react";
import { useEventStore } from "../stores/eventStore";

export function useWebSocket() {
  const { push, setConnected } = useEventStore();
  const reconnectTimeout = useRef<NodeJS.Timeout | null>(null);

  useEffect(() => {
    let socket: WebSocket | null = null;
    let isMounted = true;

    function connect() {
      if (reconnectTimeout.current) clearTimeout(reconnectTimeout.current);

      const protocol = window.location.protocol === "https:" ? "wss:" : "ws:";
      const host = import.meta.env.DEV ? "localhost:7860" : window.location.host;
      const url = `${protocol}//${host}/ws/events`;

      socket = new WebSocket(url);

      socket.onopen = () => {
        if (!isMounted) return;
        setConnected(true);
        console.log("WebSocket connected");
      };

      socket.onmessage = (event) => {
        if (!isMounted) return;
        try {
          const data = JSON.parse(event.data);
          push({
            ...data,
            timestamp: new Date().toISOString(),
          });
        } catch (err) {
          console.error("Failed to parse WS message", err);
        }
      };

      socket.onclose = () => {
        if (!isMounted) return;
        setConnected(false);
        console.log("WebSocket closed, reconnecting in 3s...");
        reconnectTimeout.current = setTimeout(connect, 3000);
      };

      socket.onerror = (err) => {
        console.error("WebSocket error", err);
        socket?.close();
      };
    }

    connect();

    return () => {
      isMounted = false;
      if (reconnectTimeout.current) clearTimeout(reconnectTimeout.current);
      socket?.close();
    };
  }, [push, setConnected]);
}