import { useState, useCallback, useRef } from "react";

/**
 * 설정 패널 접기/펼치기 상태를 sessionStorage로 기억하는 훅
 *
 * - 초기 상태: 모든 섹션 접힘
 * - 사용자가 펼친 섹션은 같은 탭 세션 내에서 기억
 * - 탭 닫으면 초기화
 *
 * @param storageKey sessionStorage 키 (예: "pop-card-list")
 */
export function useCollapsibleSections(storageKey: string) {
  const fullKey = `pop-config-sections-${storageKey}`;

  const [openSections, setOpenSections] = useState<Set<string>>(() => {
    if (typeof window === "undefined") return new Set<string>();
    try {
      const saved = sessionStorage.getItem(fullKey);
      if (saved) return new Set<string>(JSON.parse(saved));
    } catch {}
    return new Set<string>();
  });

  const openSectionsRef = useRef(openSections);
  openSectionsRef.current = openSections;

  const persist = useCallback(
    (next: Set<string>) => {
      try {
        sessionStorage.setItem(fullKey, JSON.stringify([...next]));
      } catch {}
    },
    [fullKey],
  );

  const isOpen = useCallback(
    (key: string) => openSectionsRef.current.has(key),
    [],
  );

  const toggle = useCallback(
    (key: string) => {
      setOpenSections((prev) => {
        const next = new Set(prev);
        if (next.has(key)) {
          next.delete(key);
        } else {
          next.add(key);
        }
        persist(next);
        return next;
      });
    },
    [persist],
  );

  return { isOpen, toggle };
}