"use client";

import { useState } from "react";
import Link from "next/link";
import { ChevronDown } from "lucide-react";
import { cn } from "@/lib/utils";

interface DropdownItem {
  label: string;
  href: string;
  description?: string;
}

interface DropdownSection {
  title?: string;
  items: DropdownItem[];
}

interface NavDropdownProps {
  label: string;
  triggerHref?: string;
  sections: DropdownSection[];
  align?: "left" | "center" | "right";
}

export function NavDropdown({ label, triggerHref, sections, align = "center" }: NavDropdownProps) {
  const [isOpen, setIsOpen] = useState(false);

  const handleKeyDown = (e: React.KeyboardEvent) => {
    if (e.key === "Escape") {
      setIsOpen(false);
    }
  };

  return (
    <div
      className="relative group"
      onMouseEnter={() => setIsOpen(true)}
      onMouseLeave={() => setIsOpen(false)}
      onKeyDown={handleKeyDown}
    >
      <div className="flex items-center gap-1 py-2 text-sm font-medium text-primary hover:text-accent cursor-pointer transition-colors focus-within:text-accent">
        {triggerHref ? (
          <Link href={triggerHref} className="outline-none">
            {label}
          </Link>
        ) : (
          <span tabIndex={0} className="outline-none select-none">
            {label}
          </span>
        )}
        <ChevronDown className="size-4 transition-transform duration-200 group-hover:rotate-180" />
      </div>

      {/* Dropdown Panel */}
      <div
        className={cn(
          "absolute top-full pt-2 z-50 w-[640px] transition-all duration-200 origin-top",
          align === "left" && "left-0",
          align === "center" && "left-1/2 -translate-x-1/2",
          align === "right" && "right-0",
          isOpen
            ? "opacity-100 translate-y-0 scale-100 pointer-events-auto"
            : "opacity-0 -translate-y-2 scale-95 pointer-events-none"
        )}
      >
        <div className="bg-white rounded-xl shadow-lg border border-border p-6 grid grid-cols-2 gap-8">
          {sections.map((section, sIdx) => (
            <div key={sIdx} className="flex flex-col gap-3">
              {section.title && (
                <h4 className="text-xs font-semibold uppercase tracking-wider text-text-muted mb-1 font-heading">
                  {section.title}
                </h4>
              )}
              <ul className="flex flex-col gap-2">
                {section.items.map((item, iIdx) => (
                  <li key={iIdx}>
                    <Link
                      href={item.href}
                      className="group/item flex flex-col gap-0.5 p-2 -mx-2 rounded-lg hover:bg-muted transition-colors"
                      onClick={() => setIsOpen(false)}
                    >
                      <span className="text-sm font-medium text-primary group-hover/item:text-accent transition-colors">
                        {item.label}
                      </span>
                      {item.description && (
                        <span className="text-xs text-text-muted leading-snug">
                          {item.description}
                        </span>
                      )}
                    </Link>
                  </li>
                ))}
              </ul>
            </div>
          ))}
        </div>
      </div>
    </div>
  );
}