'use client';

import { useEffect } from 'react';
import { QRCodeSVG } from 'qrcode.react';
import toast from 'react-hot-toast';
import {
  XMarkIcon,
  ArrowDownTrayIcon,
  CalendarDaysIcon,
  CalendarIcon,
  MapPinIcon,
  ClockIcon,
  UserPlusIcon,
} from '@heroicons/react/24/outline';
import Button from '@/components/ui/Button';
import type { UserTicket } from '@/lib/api';
import { formatDateLong, formatTime } from '@/lib/utils';
import {
  ticketScanUrl,
  ticketPdfUrl,
  googleCalendarUrl,
  shareTicket,
} from './helpers';

/**
 * Full-screen, scannable QR view for the door. Handles single tickets and
 * multi-ticket bookings (one QR per ticket, with "Share with a guest" on the
 * spares so guests can be let in with their own code).
 */
export default function QrTicketModal({
  tickets,
  locale,
  onClose,
}: {
  tickets: UserTicket[];
  locale: string;
  onClose: () => void;
}) {
  useEffect(() => {
    const onKey = (e: KeyboardEvent) => e.key === 'Escape' && onClose();
    document.addEventListener('keydown', onKey);
    document.body.style.overflow = 'hidden';
    return () => {
      document.removeEventListener('keydown', onKey);
      document.body.style.overflow = '';
    };
  }, [onClose]);

  if (tickets.length === 0) return null;

  const first = tickets[0];
  const event = first.event;
  const eventTitle =
    (locale === 'es' && event?.titleEs ? event.titleEs : event?.title) || 'Event';
  const isMulti = tickets.length > 1;

  const handleShare = async (ticketId: string) => {
    const result = await shareTicket(ticketId, eventTitle, locale);
    if (result === 'copied') {
      toast.success(locale === 'es' ? 'Enlace copiado' : 'Link copied');
    } else if (result === 'failed') {
      toast.error(locale === 'es' ? 'No se pudo compartir' : 'Could not share');
    }
  };

  return (
    <div className="fixed inset-0 z-[70] overflow-y-auto bg-white">
      {/* Top bar */}
      <div className="sticky top-0 z-10 flex items-center justify-between border-b border-secondary-light-gray bg-white px-4 py-3">
        <span className="text-sm font-semibold text-primary-dark">
          {isMulti
            ? locale === 'es'
              ? `${tickets.length} entradas`
              : `${tickets.length} tickets`
            : locale === 'es'
            ? 'Tu entrada'
            : 'Your ticket'}
        </span>
        <button
          onClick={onClose}
          aria-label={locale === 'es' ? 'Cerrar' : 'Close'}
          className="rounded-full p-2 text-gray-500 hover:bg-gray-100"
        >
          <XMarkIcon className="h-6 w-6" />
        </button>
      </div>

      <div className="mx-auto max-w-md px-4 pb-12 pt-6">
        {/* Event details */}
        <div className="mb-6 text-center">
          <h2 className="text-xl font-bold text-primary-dark">{eventTitle}</h2>
          {event && (
            <div className="mt-3 space-y-1.5 text-sm text-gray-600">
              <p className="flex items-center justify-center gap-2">
                <CalendarIcon className="h-4 w-4 text-primary-yellow" />
                {formatDateLong(event.startDatetime, locale as 'en' | 'es')}
              </p>
              <p className="flex items-center justify-center gap-2">
                <ClockIcon className="h-4 w-4 text-primary-yellow" />
                {formatTime(event.startDatetime, locale as 'en' | 'es')}
              </p>
              <p className="flex items-center justify-center gap-2">
                <MapPinIcon className="h-4 w-4 text-primary-yellow" />
                {event.location}
              </p>
            </div>
          )}
        </div>

        {/* One QR per ticket */}
        <div className="space-y-5">
          {tickets.map((ticket, idx) => {
            const attendee = [ticket.attendeeFirstName, ticket.attendeeLastName]
              .filter(Boolean)
              .join(' ');
            const isSpare = isMulti && idx > 0;
            return (
              <div
                key={ticket.id}
                className="rounded-card border border-secondary-light-gray p-5 text-center"
              >
                {isMulti && (
                  <p className="mb-3 text-xs font-semibold uppercase tracking-wider text-gray-500">
                    {locale === 'es' ? 'Entrada' : 'Ticket'} {idx + 1}
                    {attendee ? ` • ${attendee}` : ''}
                    {isSpare
                      ? ` • ${locale === 'es' ? 'Invitado' : 'Guest'}`
                      : ''}
                  </p>
                )}
                <div className="inline-block rounded-lg bg-white p-4 shadow-inner">
                  <QRCodeSVG
                    value={ticketScanUrl(ticket.id)}
                    size={220}
                    level="M"
                    includeMargin={false}
                  />
                </div>
                <p className="mt-3 font-mono text-sm font-bold tracking-wide text-primary-dark">
                  {ticket.qrCode}
                </p>

                {isSpare && (
                  <button
                    onClick={() => handleShare(ticket.id)}
                    className="mx-auto mt-3 flex items-center gap-2 rounded-btn border border-secondary-light-gray px-4 py-2 text-sm font-medium text-primary-dark hover:bg-gray-50"
                  >
                    <UserPlusIcon className="h-4 w-4" />
                    {locale === 'es' ? 'Compartir con un invitado' : 'Share with a guest'}
                  </button>
                )}
              </div>
            );
          })}
        </div>

        {/* Download + calendar */}
        <div className="mt-6 flex flex-col gap-2">
          <a href={ticketPdfUrl(first)} download>
            <Button className="w-full">
              <ArrowDownTrayIcon className="mr-2 h-5 w-5" />
              {isMulti
                ? locale === 'es'
                  ? 'Descargar entradas'
                  : 'Download tickets'
                : locale === 'es'
                ? 'Descargar'
                : 'Download'}
            </Button>
          </a>
          {event && (
            <a
              href={googleCalendarUrl(event, locale)}
              target="_blank"
              rel="noopener noreferrer"
            >
              <Button variant="outline" className="w-full">
                <CalendarDaysIcon className="mr-2 h-5 w-5" />
                {locale === 'es' ? 'Agregar al calendario' : 'Add to calendar'}
              </Button>
            </a>
          )}
        </div>
      </div>
    </div>
  );
}