import SelectionArea from '@knotx/viselect';

// Create a selection area with virtual scrolling support
const selection = new SelectionArea({
  // Other options...
  
  // Custom scroll controller
  scrollController: {
    // Custom method to get scroll position
    getScrollPosition: (element) => {
      // If element is a virtual scroll container, return virtual scroll position
      if (element.classList.contains('virtual-scroll-container')) {
        return {
          x: yourVirtualScrollInstance.scrollLeft,
          y: yourVirtualScrollInstance.scrollTop
        };
      }
      
      // Otherwise return native scroll position
      return {
        x: element.scrollLeft,
        y: element.scrollTop
      };
    },
    
    // Custom method to set scroll position
    setScrollPosition: (element, position) => {
      // If element is a virtual scroll container, set virtual scroll position
      if (element.classList.contains('virtual-scroll-container')) {
        if (position.x !== undefined) {
          yourVirtualScrollInstance.scrollLeft = position.x;
        }
        if (position.y !== undefined) {
          yourVirtualScrollInstance.scrollTop = position.y;
        }
        return;
      }
      
      // Otherwise set native scroll position
      if (position.x !== undefined) {
        element.scrollLeft = position.x;
      }
      if (position.y !== undefined) {
        element.scrollTop = position.y;
      }
    },
    
    // Custom method to get scroll size (total scrollable area)
    getScrollSize: (element) => {
      if (element.classList.contains('virtual-scroll-container')) {
        return {
          width: yourVirtualScrollInstance.scrollWidth,
          height: yourVirtualScrollInstance.scrollHeight
        };
      }
      
      return {
        width: element.scrollWidth,
        height: element.scrollHeight
      };
    },
    
    // Custom method to get client size (visible area)
    getClientSize: (element) => {
      if (element.classList.contains('virtual-scroll-container')) {
        return {
          width: yourVirtualScrollInstance.clientWidth,
          height: yourVirtualScrollInstance.clientHeight
        };
      }
      
      return {
        width: element.clientWidth,
        height: element.clientHeight
      };
    }
  }
});