// app/events/[id]/page.tsx
// Event detail page with registration form

import { query } from '@/lib/db';
import { Event, EventRegistration } from '@/types/racing';
import { notFound } from 'next/navigation';
import { TrophyIcon, MapPinIcon, UsersIcon, ClockIcon, CalendarIcon } from '@/components/ui/icons';
import EventRegistrationForm from '@/components/events/EventRegistrationForm';

async function getEvent(eventId: number): Promise<Event | null> {
  const sql = `
    SELECT e.*, COUNT(er.registration_id) as registrations_count
    FROM events e
    LEFT JOIN event_registrations er ON e.event_id = er.event_id AND er.status = 'REGISTERED'
    WHERE e.event_id = $1
    GROUP BY e.event_id
  `;
  
  const rows = await query(sql, [eventId]);
  return rows.length > 0 ? rows[0] as Event : null;
}

async function getEventRegistrations(eventId: number): Promise<EventRegistration[]> {
  const sql = `
    SELECT 
      er.*,
      u.driver_name
    FROM event_registrations er
    JOIN users u ON er.driver_guid = u.driver_guid
    WHERE er.event_id = $1 AND er.status = 'REGISTERED'
    ORDER BY er.registration_date ASC
  `;
  
  const rows = await query(sql, [eventId]);
  return rows as EventRegistration[];
}

function formatDate(date: Date): string {
  return new Date(date).toLocaleDateString('en-US', {
    weekday: 'long',
    year: 'numeric',
    month: 'long',
    day: 'numeric',
    hour: '2-digit',
    minute: '2-digit'
  });
}

export default async function EventDetailPage({
  params,
}: {
  params: Promise<{ id: string }>;
}) {
  const { event_id } = await params;
  
  const eventId = parseInt(event_id, 10);
  
  const event: any = await getEvent(eventId);
  if (!event) {
    notFound();
  }

  const registrations = await getEventRegistrations(eventId);
  
  const isOpen = event.event_status === 'OPEN';
  const isFull = event.registrations_count >= event.max_participants;
  const deadlinePassed = event.registration_deadline && new Date(event.registration_deadline) < new Date();
  const canRegister = isOpen && !isFull && !deadlinePassed;

  return (
    <>
      {/* Hero */}
      <div className="relative border-b border-white/10 grid-overlay">
        <div className="max-w-7xl mx-auto px-6 py-16">
          <div className="space-y-4">
            <div className="inline-flex items-center space-x-2 px-3 py-1 border border-white/20 bg-black">
              <TrophyIcon className="w-4 h-4" />
              <span className="text-xs font-medium tracking-wider">EVENT DETAILS</span>
            </div>
            <h1 className="text-5xl font-bold tracking-tight">
              {event.event_name}
            </h1>
            <p className="text-white/70 text-lg max-w-3xl">
              {event.event_description}
            </p>
          </div>

          {/* Event Info Cards */}
          <div className="grid grid-cols-1 md:grid-cols-4 gap-4 mt-12">
            <InfoCard label="TRACK" value={event.event_track} icon={<MapPinIcon className="w-6 h-6" />} />
            <InfoCard label="DATE" value={formatDate(event.event_date)} icon={<CalendarIcon className="w-6 h-6"/>} />
            <InfoCard label="DURATION" value={`${event.event_duration || 'TBD'} min`} icon={<ClockIcon className="w-6 h-6" />} />
            <InfoCard 
              label="PARTICIPANTS" 
              value={`${event.registrations_count}/${event.max_participants}`} 
              icon={<UsersIcon className="w-6 h-6" />} 
            />
          </div>
        </div>
      </div>

      {/* Main Content */}
      <div className="max-w-7xl mx-auto px-6 py-12">
        <div className="grid grid-cols-1 lg:grid-cols-3 gap-6">
          {/* Left Column - Registration */}
          <div className="lg:col-span-2 space-y-6">
            {/* Registration Form */}
            {canRegister ? (
              <div className="border border-white/10 bg-black p-6">
                <h2 className="text-2xl font-bold tracking-tight mb-6">REGISTER FOR EVENT</h2>
                <EventRegistrationForm eventId={event.event_id} />
              </div>
            ) : (
              <div className="border border-white/10 bg-black p-6">
                <h2 className="text-2xl font-bold tracking-tight mb-4">REGISTRATION CLOSED</h2>
                <p className="text-white/60">
                  {isFull && 'This event is full.'}
                  {deadlinePassed && !isFull && 'Registration deadline has passed.'}
                  {event.event_status === 'CLOSED' && !isFull && !deadlinePassed && 'Registration is closed for this event.'}
                </p>
              </div>
            )}

            {/* Event Rules */}
            {event.event_rules && (
              <div className="border border-white/10 bg-black p-6 topo-lines-dense">
                <h3 className="text-xl font-bold tracking-tight mb-4">EVENT RULES</h3>
                <div className="text-white/70 text-sm space-y-2 whitespace-pre-line">
                  {event.event_rules}
                </div>
              </div>
            )}
          </div>

          {/* Right Column - Registered Participants */}
          <div className="lg:col-span-1">
            <div className="border border-white/10 bg-black p-6 sticky top-20">
              <h3 className="text-xl font-bold tracking-tight mb-4">
                REGISTERED DRIVERS ({event.registrations_count})
              </h3>
              <div className="space-y-3 max-h-[600px] overflow-y-auto">
                {registrations.length === 0 ? (
                  <p className="text-white/40 text-sm">No registrations yet</p>
                ) : (
                  registrations.map((reg: any, index: number) => (
                    <div key={reg.registration_id} className="border border-white/10 p-3">
                      <div className="flex items-start justify-between mb-2">
                        <div className="flex items-center space-x-2">
                          <span className="text-xs font-bold text-white/40">
                            #{String(index + 1).padStart(2, '0')}
                          </span>
                          <span className="font-semibold text-sm">{reg.driver_name}</span>
                        </div>
                      </div>
                      <div className="space-y-1 text-xs text-white/60">
                        <div>Car: <span className="text-white/80 font-mono">{reg.car_model}</span></div>
                        {reg.car_skin && <div>Skin: <span className="text-white/80">{reg.car_skin}</span></div>}
                        {reg.team_name && <div>Team: <span className="text-white/80">{reg.team_name}</span></div>}
                      </div>
                    </div>
                  ))
                )}
              </div>
            </div>
          </div>
        </div>
      </div>
    </>
  );
}

function InfoCard({ 
  label, 
  value, 
  icon 
}: { 
  label: string; 
  value: string; 
  icon: React.ReactNode;
}) {
  return (
    <div className="border border-white/10 p-4 sharp-border">
      <div className="flex items-center justify-between mb-2">
        <span className="text-xs font-bold tracking-wider text-white/60">{label}</span>
        <div className="text-white/40 text-sm">
          {icon}
        </div>
      </div>
      <div className="text-lg font-bold tracking-tight">
        {value}
      </div>
    </div>
  );
}