import { getMemberToken, getApiBaseUrl } from '../../_lib/api';
import { RsvpButton } from './RsvpButton';
import Link from 'next/link';

type RsvpStatus = 'GOING' | 'NOT_GOING' | 'MAYBE';

interface EventItem {
  id: string;
  title: string;
  description: string | null;
  location: string | null;
  startsAt: string;
  endsAt: string | null;
  rsvpCount: number;
  myRsvp: RsvpStatus | null;
}

async function fetchEvents(token: string): Promise<EventItem[]> {
  const res = await fetch(`${getApiBaseUrl()}/my/events`, {
    headers: { Authorization: `Bearer ${token}` },
    cache: 'no-store',
  }).catch(() => null);
  if (!res || !res.ok) return [];
  return (await res.json()) as EventItem[];
}

function formatEventDate(startsAt: string, endsAt: string | null): string {
  const start = new Date(startsAt);
  const dateStr = start.toLocaleDateString('en-IN', { weekday: 'short', day: 'numeric', month: 'short', year: 'numeric' });
  const timeStr = start.toLocaleTimeString('en-IN', { hour: '2-digit', minute: '2-digit' });
  if (!endsAt) return `${dateStr} · ${timeStr}`;
  const end = new Date(endsAt);
  const endTime = end.toLocaleTimeString('en-IN', { hour: '2-digit', minute: '2-digit' });
  return `${dateStr} · ${timeStr} – ${endTime}`;
}

const RSVP_BADGE: Record<RsvpStatus, { label: string; cls: string }> = {
  GOING: { label: 'Going', cls: 'bg-green-100 text-green-700' },
  MAYBE: { label: 'Maybe', cls: 'bg-yellow-100 text-yellow-700' },
  NOT_GOING: { label: 'Not going', cls: 'bg-gray-100 text-gray-500' },
};

export default async function EventsPage() {
  const token = await getMemberToken();
  if (!token) return null;

  const events = await fetchEvents(token);
  const upcoming = events.filter((e) => new Date(e.startsAt) >= new Date());
  const past = events.filter((e) => new Date(e.startsAt) < new Date());

  return (
    <div className="max-w-2xl mx-auto space-y-6">
      <div className="flex items-center justify-between">
        <h1 className="text-xl font-semibold text-gray-900">Events</h1>
        <Link href="/my" className="text-sm text-indigo-600 hover:underline">← Dashboard</Link>
      </div>

      {events.length === 0 && (
        <div className="text-center py-16 text-gray-400">
          <p className="text-sm">No events scheduled.</p>
          <p className="text-xs mt-1">Your chapter admin will post events here.</p>
        </div>
      )}

      {upcoming.length > 0 && (
        <section>
          <h2 className="text-xs font-semibold text-gray-400 uppercase tracking-wide mb-3">Upcoming</h2>
          <div className="space-y-4">
            {upcoming.map((e) => (
              <div key={e.id} className="bg-white rounded-xl border border-gray-200 p-5">
                <div className="flex items-start justify-between gap-3">
                  <div className="min-w-0">
                    <p className="text-sm font-semibold text-gray-900">{e.title}</p>
                    <p className="text-xs text-indigo-600 mt-0.5">{formatEventDate(e.startsAt, e.endsAt)}</p>
                    {e.location && (
                      <p className="text-xs text-gray-400 mt-0.5">{e.location}</p>
                    )}
                  </div>
                  {e.myRsvp && (
                    <span className={`shrink-0 text-xs rounded-full px-2.5 py-1 font-medium ${RSVP_BADGE[e.myRsvp].cls}`}>
                      {RSVP_BADGE[e.myRsvp].label}
                    </span>
                  )}
                </div>
                {e.description && (
                  <p className="text-sm text-gray-600 mt-2 leading-relaxed">{e.description}</p>
                )}
                <div className="flex items-center justify-between mt-3">
                  <span className="text-xs text-gray-400">{e.rsvpCount} {e.rsvpCount === 1 ? 'response' : 'responses'}</span>
                </div>
                <RsvpButton eventId={e.id} initial={e.myRsvp} />
              </div>
            ))}
          </div>
        </section>
      )}

      {past.length > 0 && (
        <section>
          <h2 className="text-xs font-semibold text-gray-400 uppercase tracking-wide mb-3">Past</h2>
          <div className="space-y-3">
            {past.map((e) => (
              <div key={e.id} className="bg-white rounded-xl border border-gray-100 p-4 opacity-60">
                <p className="text-sm font-medium text-gray-700">{e.title}</p>
                <p className="text-xs text-gray-400 mt-0.5">{formatEventDate(e.startsAt, e.endsAt)}</p>
                {e.myRsvp && (
                  <span className={`inline-block mt-1 text-xs rounded-full px-2 py-0.5 ${RSVP_BADGE[e.myRsvp].cls}`}>
                    {RSVP_BADGE[e.myRsvp].label}
                  </span>
                )}
              </div>
            ))}
          </div>
        </section>
      )}
    </div>
  );
}