import { Check, HelpCircle, X, Loader2 } from 'lucide-react';
import { LoginArea } from '@/components/auth/LoginArea';
import { useCurrentUser } from '@/hooks/useCurrentUser';
import { useToast } from '@/hooks/useToast';
import { useEventRsvps, useRsvp } from '@/hooks/useEventRsvps';
import { eventCoord } from '@/hooks/useEventRsvps';
import { cn } from '@/lib/utils';
import type { RsvpStatus, SkateEvent } from '@/lib/types';

const OPTIONS: {
  status: RsvpStatus;
  label: string;
  shortLabel: string;
  icon: typeof Check;
  activeClass: string;
}[] = [
  {
    status: 'accepted',
    label: "I'm Going",
    shortLabel: 'Going',
    icon: Check,
    activeClass: 'bg-green-500 border-green-500 text-black',
  },
  {
    status: 'tentative',
    label: 'Interested',
    shortLabel: 'Maybe',
    icon: HelpCircle,
    activeClass: 'bg-[#ccff00] border-[#ccff00] text-black',
  },
  {
    status: 'declined',
    label: "Can't make it",
    shortLabel: "Can't",
    icon: X,
    activeClass: 'bg-red-500/80 border-red-500 text-white',
  },
];

/**
 * NIP-52 RSVP control. A segmented Going / Interested / Can't-make-it toggle
 * that publishes (or replaces) the user's RSVP. Tapping the active option again
 * is a no-op. Logged-out users see a login prompt instead.
 */
export function RsvpButtons({ event, className }: { event: SkateEvent; className?: string }) {
  const { user } = useCurrentUser();
  const { toast } = useToast();
  const coord = eventCoord(event);
  const { myRsvp, myStatus, goingCount, tentativeCount } = useEventRsvps(coord);
  const { mutateAsync: rsvp, isPending } = useRsvp();

  const isHost = user?.pubkey === event.pubkey;

  if (!user) {
    return (
      <div className={cn('rounded-xl border border-white/10 bg-white/[0.03] p-4 text-center', className)}>
        <p className="mb-3 text-sm font-bold text-gray-300">
          Are you going?{' '}
          <span className="text-muted-foreground font-normal">Log in to RSVP.</span>
        </p>
        <LoginArea className="w-full justify-center" />
      </div>
    );
  }

  const handleClick = async (status: RsvpStatus) => {
    if (status === myStatus || isPending) return;
    try {
      await rsvp({
        event,
        status,
        existingIdentifier: myRsvp?.identifier,
      });
      const msg =
        status === 'accepted'
          ? "You're going! 🛹"
          : status === 'tentative'
            ? 'Marked as interested.'
            : 'Marked as not going.';
      toast({ title: msg });
    } catch (err) {
      toast({
        title: 'Could not RSVP',
        description: err instanceof Error ? err.message : 'Please try again.',
        variant: 'destructive',
      });
    }
  };

  return (
    <div className={cn('space-y-2', className)}>
      {isHost && (
        <p className="text-xs text-muted-foreground">
          You're hosting this — but you can still set your status.
        </p>
      )}
      <div className="grid grid-cols-3 gap-2">
        {OPTIONS.map(({ status, label, shortLabel, icon: Icon, activeClass }) => {
          const active = myStatus === status;
          return (
            <button
              key={status}
              type="button"
              disabled={isPending}
              onClick={() => handleClick(status)}
              aria-pressed={active}
              className={cn(
                'flex flex-col items-center justify-center gap-1 rounded-xl border-2 py-2.5 text-xs font-black uppercase tracking-wide transition-all active:scale-95 disabled:opacity-60',
                active
                  ? activeClass
                  : 'border-white/10 bg-white/5 text-gray-400 hover:border-white/20 hover:text-white',
              )}
            >
              {isPending && active ? (
                <Loader2 className="h-4 w-4 animate-spin" />
              ) : (
                <Icon className="h-4 w-4" />
              )}
              <span className="hidden sm:inline">{label}</span>
              <span className="sm:hidden">{shortLabel}</span>
            </button>
          );
        })}
      </div>
      {(goingCount > 0 || tentativeCount > 0) && (
        <p className="text-center text-xs text-muted-foreground">
          <span className="font-bold text-green-400">{goingCount}</span> going
          {tentativeCount > 0 && (
            <>
              {' · '}
              <span className="font-bold text-[#ccff00]">{tentativeCount}</span> interested
            </>
          )}
        </p>
      )}
    </div>
  );
}