import { useState, useEffect, useRef } from "preact/hooks";
import type { SessionEntry } from "./types";
import { fetchSessionLog } from "./api";

export function useSessionLog(sessionFile: string | null, isOpen: boolean, shouldPoll: boolean) {
  const [entries, setEntries] = useState<SessionEntry[]>([]);
  const [loading, setLoading] = useState(false);
  const loadedRef = useRef(false);

  useEffect(() => {
    if (!sessionFile || !isOpen) return;

    let cancelled = false;

    const load = async () => {
      if (!loadedRef.current) setLoading(true);
      try {
        const data = await fetchSessionLog(sessionFile);
        if (!cancelled) {
          setEntries(data);
          setLoading(false);
          loadedRef.current = true;
        }
      } catch {
        if (!cancelled) setLoading(false);
      }
    };

    load();
    if (shouldPoll) {
      const id = setInterval(load, 3000);
      return () => { cancelled = true; clearInterval(id); };
    }
    return () => { cancelled = true; };
  }, [sessionFile, isOpen, shouldPoll]);

  return { entries, loading };
}