'use client';

import { useRef, useEffect } from 'react';
import { ChevronDown, Lock, Sparkles } from 'lucide-react';
import { StaticLink } from '@/components/ui/static-link';
import { AnimatePresence, motion } from 'framer-motion';
import type { MegaDropdownGroup } from '@/lib/site-config';

interface MegaDropdownProps {
  label: string;
  groups: MegaDropdownGroup[];
  isOpen: boolean;
  isActive?: boolean;
  onToggle: () => void;
  onOpen: () => void;
  onClose: () => void;
}

export function MegaDropdown({ label, groups, isOpen, isActive, onToggle, onOpen, onClose }: MegaDropdownProps) {
  const dropdownRef = useRef<HTMLDivElement>(null);
  const timeoutRef = useRef<ReturnType<typeof setTimeout>>(undefined);

  const handleMouseEnter = () => {
    clearTimeout(timeoutRef.current);
    onOpen();
  };

  const handleMouseLeave = () => {
    timeoutRef.current = setTimeout(onClose, 300);
  };

  useEffect(() => {
    return () => clearTimeout(timeoutRef.current);
  }, []);

  return (
    <div ref={dropdownRef} className="relative" onMouseEnter={handleMouseEnter} onMouseLeave={handleMouseLeave}>
      <div className="-mx-2 px-2 py-2">
        <button
          onClick={onToggle}
          className={`
            relative flex items-center gap-1 px-3 py-2 text-sm font-medium
            transition-all duration-300 ease-out
            ${isOpen || isActive
              ? 'text-text-primary'
              : 'text-text-secondary hover:text-text-primary hover:bg-bg-secondary'
            }
          `}
          aria-expanded={isOpen}
          aria-haspopup="true"
          aria-current={isActive ? 'page' : undefined}
        >
          {label}
          <ChevronDown
            className={`w-4 h-4 transition-transform duration-200 ${isOpen ? 'rotate-180' : ''}`}
          />
          <span
            className={`
              absolute -bottom-0.5 left-3 right-3 h-0.5 bg-brand
              transition-all duration-300 ease-out
              ${isActive
                ? 'opacity-100 scale-x-100'
                : 'opacity-0 scale-x-0'
              }
            `}
          />
        </button>
      </div>

      <AnimatePresence>
        {isOpen && (
          <motion.div
            initial={{ opacity: 0, y: -8 }}
            animate={{ opacity: 1, y: 0 }}
            exit={{ opacity: 0, y: -8 }}
            transition={{ duration: 0.15 }}
            className="absolute top-full left-1/2 -translate-x-1/2 pt-2 w-[640px] z-50"
          >
            <div className="bg-white backdrop-blur-xl rounded-none border border-border-primary p-6">
              {groups.map((group, groupIndex) => (
                <div key={group.id} className={groupIndex > 0 ? 'mt-6 pt-6 border-t border-border-primary' : ''}>
                  <div className="flex items-center gap-2 mb-3">
                    <h3 className="text-sm font-bold text-text-primary">{group.title}</h3>
                    {group.description && (
                      <span className="text-xs text-text-muted">{group.description}</span>
                    )}
                    {group.highlight && (
                      <Sparkles className="w-3.5 h-3.5 text-brand" />
                    )}
                  </div>
                  
                  <div className={`grid gap-2 ${group.items.length > 4 ? 'grid-cols-3' : 'grid-cols-2'}`}>
                    {group.items.map((item) => {
                      const isPlaceholder = item.href === '#';
                      const content = (
                        <div className="flex items-start justify-between gap-2">
                          <div className="flex-1 min-w-0">
                            <div className="flex items-center gap-2">
                              <div className="text-sm font-semibold text-text-primary">{item.title}</div>
                              {item.badge && (
                                <span className={`shrink-0 px-1.5 py-0.5 text-[10px] font-medium ${
                                  item.badge === '敬请期待'
                                    ? 'bg-bg-tertiary text-text-muted'
                                    : 'bg-brand/10 text-brand'
                                }`}>
                                  {item.badge === '敬请期待' && <Lock className="w-2.5 h-2.5 inline mr-0.5" />}
                                  {item.badge}
                                </span>
                              )}
                            </div>
                            <div className="text-xs text-text-secondary mt-1 leading-relaxed">{item.description}</div>
                          </div>
                        </div>
                      );

                      if (isPlaceholder) {
                        return (
                          <div
                            key={item.id}
                            className="block p-3 border border-border-primary bg-bg-secondary cursor-not-allowed opacity-50"
                            aria-disabled="true"
                          >
                            {content}
                          </div>
                        );
                      }

                      return (
                        <StaticLink
                          key={item.id}
                          href={item.href}
                          className="block p-3 border border-transparent transition-all duration-300 ease-out group hover:border-border-primary hover:bg-bg-secondary"
                        >
                          {content}
                        </StaticLink>
                      );
                    })}
                  </div>
                </div>
              ))}

              <div className="mt-4 pt-4 border-t border-border-primary">
                <StaticLink
                  href={`/${label === '产品' ? 'products' : label === '解决方案' ? 'solutions' : 'services'}`}
                  className="flex items-center justify-center gap-1 text-xs font-medium text-text-muted hover:text-text-primary transition-colors"
                >
                  查看全部{label}
                  <ChevronDown className="w-3 h-3 rotate-[-90deg]" />
                </StaticLink>
              </div>
            </div>
          </motion.div>
        )}
      </AnimatePresence>
    </div>
  );
}