import { ChevronDown, ChevronRight, Home, FileText, Users, BarChart3, Cog, GitBranch, Bot } from "lucide-react";
import { cn } from "@/lib/utils";
import { MenuItem } from "@/types/menu";
import { MENU_ICONS, MESSAGES } from "@/constants/layout";
import { getIconComponent } from "@/components/admin/MenuIconPicker";

interface MainSidebarProps {
  menuList: MenuItem[];
  expandedMenus: Set<string>;
  onMenuClick: (menu: MenuItem) => void;
  className?: string;
}

/**
 * 메뉴 아이콘 선택 함수 (DB 아이콘 우선, 없으면 키워드 기반 fallback)
 */
const getMenuIcon = (menuName: string, dbIconName?: string | null) => {
  if (dbIconName) {
    const DbIcon = getIconComponent(dbIconName);
    if (DbIcon) return <DbIcon className="h-4 w-4" />;
  }

  if (MENU_ICONS.HOME.some((keyword) => menuName.includes(keyword))) {
    return <Home className="h-4 w-4" />;
  }
  if (MENU_ICONS.DOCUMENT.some((keyword) => menuName.includes(keyword))) {
    return <FileText className="h-4 w-4" />;
  }
  if (MENU_ICONS.USERS.some((keyword) => menuName.includes(keyword))) {
    return <Users className="h-4 w-4" />;
  }
  if (MENU_ICONS.STATISTICS.some((keyword) => menuName.includes(keyword))) {
    return <BarChart3 className="h-4 w-4" />;
  }
  if (MENU_ICONS.SETTINGS.some((keyword) => menuName.includes(keyword))) {
    return <Cog className="h-4 w-4" />;
  }
  if (MENU_ICONS.DATAFLOW.some((keyword) => menuName.includes(keyword))) {
    return <GitBranch className="h-4 w-4" />;
  }
  if (MENU_ICONS.AI.some((keyword) => menuName.includes(keyword))) {
    return <Bot className="h-4 w-4" />;
  }
  return <FileText className="h-4 w-4" />;
};

/**
 * 메인 사이드바 컴포넌트
 */
export function MainSidebar({ menuList, expandedMenus, onMenuClick, className = "" }: MainSidebarProps) {
  /**
   * 메뉴 아이템 렌더링
   */
  const renderMenuItem = (menu: MenuItem, level: number = 0) => {
    const hasChildren = menu.children && menu.children.length > 0;
    const isExpanded = expandedMenus.has(String(menu.OBJID));

    return (
      <div key={String(menu.OBJID)}>
        <button
          onClick={() => onMenuClick(menu)}
          className={cn(
            "flex w-full cursor-pointer items-center justify-between rounded-lg px-3 py-2 text-sm transition-colors",
            "hover:bg-accent hover:text-accent-foreground",
            level > 0 && "ml-4",
          )}
        >
          <div className="flex items-center gap-2">
            {getMenuIcon(menu.MENU_NAME_KOR || menu.menuNameKor || "", menu.MENU_ICON || menu.menu_icon)}
            <span>{menu.MENU_NAME_KOR || menu.menuNameKor || "메뉴"}</span>
          </div>
          {hasChildren && (isExpanded ? <ChevronDown className="h-4 w-4" /> : <ChevronRight className="h-4 w-4" />)}
        </button>

        {hasChildren && isExpanded && (
          <div className="mt-1 ml-2 space-y-1">{menu.children!.map((child) => renderMenuItem(child, level + 1))}</div>
        )}
      </div>
    );
  };

  return (
    <nav className={cn("space-y-1 overflow-y-auto", className)}>
      {menuList.length === 0 ? (
        <div className="text-sm text-gray-500">{MESSAGES.NO_MENUS}</div>
      ) : (
        menuList.map((menu) => renderMenuItem(menu))
      )}
    </nav>
  );
}
