(function () {
    const EXTREME_ZOOM_MIN = 1e-4;
    const EXTREME_ZOOM_MAX = 1e4;
  
    function applyCustomZoomHandling(cy) {
      let zoomFramePending = false;
  
      if (!cy || typeof cy.zoom !== 'function') {
        console.warn('🚫 유효하지 않은 Cytoscape 인스턴스입니다.');
        return;
      }
  
      cy.userZoomingEnabled(false); // Cytoscape 기본 줌 비활성화
  
      const container = cy.container();
      if (!container) {
        console.warn('🚫 Cytoscape container를 찾을 수 없습니다.');
        return;
      }
  
      container.addEventListener(
        'wheel',
        (event) => {
          event.preventDefault();
  
          if (zoomFramePending) return;
          zoomFramePending = true;
  
          requestAnimationFrame(() => {
            const currentZoom = cy.zoom();
  
            const clampedDelta = Math.max(-100, Math.min(100, event.deltaY));
            const zoomFactor = 1 + (clampedDelta > 0 ? -0.05 : 0.05);
            const nextZoom = currentZoom * zoomFactor;
  
            const isValid =
              isFinite(nextZoom) &&
              nextZoom >= EXTREME_ZOOM_MIN &&
              nextZoom <= EXTREME_ZOOM_MAX;
  
            if (isValid) {
              const rect = container.getBoundingClientRect();
              const renderedPosition = {
                x: event.clientX - rect.left,
                y: event.clientY - rect.top
              };
              cy.zoom({
                level: nextZoom,
                renderedPosition
              });
            } else {
              console.warn("🚫 휠 줌 비정상 값 차단:", nextZoom);
            }
  
            zoomFramePending = false;
          });
        },
        { passive: false }
      );
    }
  
    // ✅ 전역(window)으로 함수 등록
    window.applyCustomZoomHandling = applyCustomZoomHandling;
  })();