"use client";

import { usePathname } from "next/navigation";
import { useMemo } from "react";
import { useMenu } from "@/contexts/MenuContext";

function stripCompanyPrefix(pathname: string): string {
  return pathname.replace(/^\/COMPANY_\d+/, "") || "/";
}

/**
 * 현재 경로가 속한 "대분류" 메뉴의 objid 반환.
 * - 메뉴 트리에서 parent_obj_id를 따라 올라가며, 트리에 부모가 더 이상 존재하지 않는 루트 바로 직전의 노드를 반환
 * - lev 필드에 의존하지 않음 (백엔드 재귀 쿼리 결과와 무관)
 */
export function useCurrent2ndLevelMenuObjid(): number | null {
  const pathname = usePathname();
  const { userMenus, adminMenus } = useMenu();

  return useMemo(() => {
    if (!pathname) return null;

    const all: any[] = [...(userMenus as any[]), ...(adminMenus as any[])];
    if (all.length === 0) return null;

    const targetUrl = stripCompanyPrefix(pathname);

    const byObjid = new Map<string, any>();
    for (const m of all) {
      byObjid.set(String(m.objid), m);
    }

    const current = all.find((m) => m.menu_url === targetUrl);
    if (!current) {
      // eslint-disable-next-line no-console
      console.warn("[useCurrent2ndLevelMenuObjid] 메뉴 매칭 실패", { targetUrl, sample: all.slice(0, 3) });
      return null;
    }

    let node: any = current;
    let prev: any = null;
    let safety = 20;
    while (node && safety-- > 0) {
      const parentId = node.parent_obj_id;
      if (parentId === null || parentId === undefined || parentId === 0 || parentId === "0") {
        break;
      }
      const parent = byObjid.get(String(parentId));
      if (!parent) break;
      prev = node;
      node = parent;
    }

    const resultObjid = prev ? Number(prev.objid) : Number(node.objid);
    // eslint-disable-next-line no-console
    console.log("[useCurrent2ndLevelMenuObjid]", {
      targetUrl,
      currentObjid: current.objid,
      currentName: current.menu_name_kor,
      resultObjid,
      resultName: prev ? prev.menu_name_kor : node.menu_name_kor,
    });
    return resultObjid;
  }, [pathname, userMenus, adminMenus]);
}