'use client';

import Link from 'next/link';
import { useEffect, useState } from 'react';

type NavLink = { href: string; label: string };
type NavSection = { title: string; links: NavLink[] };

export default function MobileNav({
  personalisedLinks,
  shopBySections,
  customer,
}: {
  personalisedLinks: NavLink[];
  shopBySections: NavSection[];
  customer: { name: string | null; email: string } | null;
}) {
  const [open, setOpen] = useState(false);
  const [expanded, setExpanded] = useState<string | null>(null);

  // Lock background scroll while the drawer is open, and always start closed
  // on route change (this component stays mounted across client-side nav).
  useEffect(() => {
    document.body.style.overflow = open ? 'hidden' : '';
    return () => {
      document.body.style.overflow = '';
    };
  }, [open]);

  const close = () => {
    setOpen(false);
    setExpanded(null);
  };

  return (
    <div className="md:hidden">
      <button
        onClick={() => setOpen(true)}
        aria-label="Open menu"
        aria-expanded={open}
        className="flex h-9 w-9 items-center justify-center border border-line text-ink"
      >
        <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
          <path d="M3 6h18M3 12h18M3 18h18" />
        </svg>
      </button>

      {open && (
        <div className="fixed inset-0 z-50 flex">
          <div className="absolute inset-0 bg-black/30" onClick={close} />
          <div className="relative ml-auto flex h-full w-full max-w-xs flex-col overflow-y-auto bg-paper p-6">
            <div className="flex items-center justify-between">
              <span className="font-script text-3xl leading-none text-ink">Craft2Prints</span>
              <button onClick={close} aria-label="Close menu" className="flex h-9 w-9 items-center justify-center border border-line text-ink">
                <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
                  <path d="M6 6l12 12M18 6L6 18" />
                </svg>
              </button>
            </div>

            <nav className="mt-8 flex flex-col divide-y divide-line">
              <div className="py-2">
                <button
                  onClick={() => setExpanded((s) => (s === 'personalised' ? null : 'personalised'))}
                  aria-expanded={expanded === 'personalised'}
                  className="flex w-full items-center justify-between py-2 text-left tag-label"
                >
                  Personalised
                  <span className={`transition-transform ${expanded === 'personalised' ? 'rotate-180' : ''}`}>▾</span>
                </button>
                {expanded === 'personalised' && (
                  <div className="flex flex-col pb-2 pl-2">
                    {personalisedLinks.map((link) => (
                      <Link key={link.href} href={link.href} onClick={close} className="py-2 text-sm text-muted hover:text-ink">
                        {link.label}
                      </Link>
                    ))}
                  </div>
                )}
              </div>

              <Link href="/products" onClick={close} className="py-4 tag-label">
                Products
              </Link>

              <div className="py-2">
                <button
                  onClick={() => setExpanded((s) => (s === 'shopby' ? null : 'shopby'))}
                  aria-expanded={expanded === 'shopby'}
                  className="flex w-full items-center justify-between py-2 text-left tag-label"
                >
                  Shop by
                  <span className={`transition-transform ${expanded === 'shopby' ? 'rotate-180' : ''}`}>▾</span>
                </button>
                {expanded === 'shopby' && (
                  <div className="flex flex-col gap-3 pb-2 pl-2">
                    {shopBySections
                      .filter((s) => s.links.length > 0)
                      .map((section) => (
                        <div key={section.title}>
                          <p className="text-xs font-medium uppercase tracking-wide text-muted">{section.title}</p>
                          <div className="flex flex-col">
                            {section.links.map((link) => (
                              <Link key={link.href} href={link.href} onClick={close} className="py-2 text-sm text-muted hover:text-ink">
                                {link.label}
                              </Link>
                            ))}
                          </div>
                        </div>
                      ))}
                    {shopBySections.every((s) => s.links.length === 0) && (
                      <p className="text-sm text-muted">Coming soon.</p>
                    )}
                  </div>
                )}
              </div>

              <Link href="/gallery" onClick={close} className="py-4 tag-label">
                Gallery
              </Link>

              <Link href={customer ? '/account' : '/account/login'} onClick={close} className="py-4 tag-label">
                {customer ? (customer.name ?? 'My account') : 'Login'}
              </Link>
            </nav>
          </div>
        </div>
      )}
    </div>
  );
}