import { useCallback, useEffect, useId, useState } from 'react';

export type MenuItemChildrenType = {
  id: string;
  name: string;
  menuUrl: string;
};
export type MenuItemType = {
  id: string;
  name: string;
  menuUrl?: null;
  children: MenuItemChildrenType[];
};
export interface MenuProps {
  items: MenuItemType[];
  onSelectionChange: (menu: MenuItemChildrenType) => void;
  currentPath: string;
}
export const Menu = (props: MenuProps) => {
  const { items, currentPath, onSelectionChange } = props;
  const id = useId();

  const getCurrentPathItem = useCallback(() => {
    return items.find((i) => i.children.some((c) => currentPath.includes(c.menuUrl)));
  }, [items, currentPath]);

  const [expandedItemKeys, setExpandedItemKeys] = useState<MenuItemType['id'][]>(() => {
    const item = getCurrentPathItem();
    return item ? [item.id] : [];
  });

  useEffect(() => {
    const item = getCurrentPathItem();
    setExpandedItemKeys((prev) => {
      if (item && prev.length === 1 && prev[0] === item.id) {
        return prev;
      }
      return item ? [item.id] : [];
    });
  }, [getCurrentPathItem]);

  return (
    <nav aria-label="메인 메뉴">
      {Array.isArray(items) && items.length > 0 && (
        <ul>
          {items.map((item) => (
            <li key={item.id} className="border-b font-medium border-dabeeo-gray-be">
              <button
                type="button"
                aria-expanded={
                  expandedItemKeys.some((expandedItemKey) => expandedItemKey === item.id) ? 'true' : 'false'
                }
                aria-controls={`${id}-panel-${item.id}`}
                className="appearance-none peer w-full h-10 px-5 text-sm flex items-center justify-between cursor-pointer aria-expanded:bg-white transition-colors focus-visible:ring-2 focus-visible:ring-primary focus-visible:ring-inset"
                onClick={() => {
                  setExpandedItemKeys((prev) => {
                    const isExpanded = prev.some((key) => key === item.id);
                    if (isExpanded) {
                      return prev.filter((key) => key !== item.id);
                    } else {
                      return [...prev, item.id];
                    }
                  });
                }}
              >
                {item.name}
                <div
                  className="data-[expanded=true]:rotate-180 transition"
                  data-expanded={
                    expandedItemKeys.some((expandedItemKey) => expandedItemKey === item.id) ? 'true' : undefined
                  }
                >
                  {expandedItemKeys.some((expandedItemKey) => expandedItemKey === item.id) ? (
                    <svg width="12" height="12" viewBox="0 0 12 12" fill="none" xmlns="http://www.w3.org/2000/svg">
                      <rect x="1" y="7" width="2" height="10" transform="rotate(-90 1 7)" fill="#222222" />
                    </svg>
                  ) : (
                    <svg width="12" height="12" viewBox="0 0 12 12" fill="none" xmlns="http://www.w3.org/2000/svg">
                      <path d="M7 5H11V7H7V11H5V7H1V5H5V1H7V5Z" fill="#222222" />
                    </svg>
                  )}
                </div>
              </button>
              {Array.isArray(item.children) && item.children.length > 0 && (
                <div
                  id={`${id}-panel-${item.id}`}
                  aria-hidden={!expandedItemKeys.some((key) => key === item.id)}
                  data-expanded={expandedItemKeys.some((key) => key === item.id) || undefined}
                  className="group/submenu grid grid-rows-[0fr] data-[expanded]:grid-rows-[1fr] transition-[grid-template-rows]"
                >
                  <ul className="overflow-hidden opacity-0 group-data-[expanded]/submenu:opacity-100 transition-opacity duration-500">
                    {item.children.map((child) => (
                      <li key={`menu-${item.id}-child-${child.id}`}>
                        <div
                          role="link"
                          tabIndex={expandedItemKeys.some((key) => key === item.id) ? 0 : -1}
                          aria-current={currentPath.includes(child.menuUrl) ? 'page' : undefined}
                          className="flex h-10 cursor-pointer items-center gap-2.5 pl-8 text-sm font-medium bg-primary-tertiary02 aria-[current=page]:bg-dabeeo-gray-da focus:outline-none focus-visible:ring-2 focus-visible:ring-inset focus-visible:ring-blue-500"
                          onClick={() => {
                            setExpandedItemKeys([item.id]);
                            onSelectionChange(child);
                          }}
                          onKeyDown={(e) => {
                            if (e.key === 'Enter' || e.key === ' ') {
                              e.preventDefault();
                              setExpandedItemKeys([item.id]);
                              onSelectionChange(child);
                            }
                          }}
                        >
                          {child.name}
                        </div>
                      </li>
                    ))}
                  </ul>
                </div>
              )}
            </li>
          ))}
        </ul>
      )}
    </nav>
  );
};