import { useState } from 'react';
import { Link } from 'react-router-dom';
import { Avatar, AvatarFallback, AvatarImage } from '@/components/ui/avatar';
import { Button } from '@/components/ui/button';
import { useAuthor } from '@/hooks/useAuthor';
import { useAcceptCrewInvite, useDeclineCrewInvite } from '@/hooks/useCrewInvites';
import { useToast } from '@/hooks/useToast';
import { genUserName } from '@/lib/genUserName';
import { parseAddrCoord, type CrewInvite } from '@/lib/types';
import { Users, Check, X, Loader2, ShieldCheck } from 'lucide-react';
import { cn } from '@/lib/utils';

/**
 * A single crew-invite notification card with Accept / Decline actions.
 * Accepting publishes the invitee's membership attestation (making them a
 * confirmed member); declining dismisses the invite locally.
 */
export function CrewInviteCard({
  invite,
  onResolved,
  compact,
}: {
  invite: CrewInvite;
  onResolved?: () => void;
  compact?: boolean;
}) {
  const inviter = useAuthor(invite.inviter);
  const inviterName = inviter.data?.metadata?.name ?? genUserName(invite.inviter);
  const inviterPic = inviter.data?.metadata?.picture;
  const { toast } = useToast();
  const { mutateAsync: accept, isPending: accepting } = useAcceptCrewInvite();
  const { mutateAsync: decline, isPending: declining } = useDeclineCrewInvite();
  const [done, setDone] = useState<'accepted' | 'declined' | null>(null);

  const coord = parseAddrCoord(invite.crewCoord);
  const crewHref = coord ? `/crew/${coord.pubkey}/${coord.identifier}` : '/crews';

  const handleAccept = async () => {
    try {
      await accept({ invite });
      setDone('accepted');
      toast({
        title: `Welcome to ${invite.crewName}! 🛹`,
        description: 'Your membership is confirmed.',
      });
      onResolved?.();
    } catch (err) {
      toast({
        title: 'Could not accept',
        description: err instanceof Error ? err.message : 'Please try again.',
        variant: 'destructive',
      });
    }
  };

  const handleDecline = async () => {
    try {
      await decline({ invite });
      setDone('declined');
      onResolved?.();
    } catch {
      toast({ title: 'Could not decline', variant: 'destructive' });
    }
  };

  if (done) {
    return (
      <div className="flex items-center gap-2 rounded-xl border border-white/10 bg-white/[0.03] px-3 py-2.5 text-sm text-gray-400">
        {done === 'accepted' ? (
          <>
            <Check className="h-4 w-4 text-teal-400" />
            You joined <span className="font-bold text-white">{invite.crewName}</span>
          </>
        ) : (
          <>
            <X className="h-4 w-4 text-gray-500" />
            Declined invite to {invite.crewName}
          </>
        )}
      </div>
    );
  }

  const busy = accepting || declining;

  return (
    <div className={cn('rounded-xl border border-teal-500/25 bg-gradient-to-br from-teal-500/[0.08] to-transparent p-3', compact && 'p-2.5')}>
      <div className="flex items-start gap-3">
        <div className="flex h-9 w-9 flex-shrink-0 items-center justify-center rounded-xl bg-teal-500/15">
          <Users className="h-4.5 w-4.5 text-teal-400" />
        </div>
        <div className="min-w-0 flex-1">
          <p className="text-sm leading-snug text-gray-200">
            <Link to={`/${inviterNpubSafe(invite.inviter)}`} className="inline-flex items-center gap-1 font-bold text-white hover:text-teal-300">
              <Avatar className="h-4 w-4">
                <AvatarImage src={inviterPic} alt={inviterName} />
                <AvatarFallback className="text-[8px]">{inviterName.slice(0, 2).toUpperCase()}</AvatarFallback>
              </Avatar>
              {inviterName}
            </Link>{' '}
            invited you to join{' '}
            <Link to={crewHref} className="font-black text-teal-300 hover:underline">
              {invite.crewName}
            </Link>
            {invite.role === 'admin' && (
              <span className="ml-1 inline-flex items-center gap-0.5 rounded-full bg-teal-500/20 px-1.5 py-0.5 text-[9px] font-black uppercase text-teal-300">
                <ShieldCheck className="h-2.5 w-2.5" /> Admin
              </span>
            )}
          </p>
          {invite.note && (
            <p className="mt-1 rounded-lg bg-black/30 px-2.5 py-1.5 text-xs italic text-gray-400 break-words [overflow-wrap:anywhere]">
              “{invite.note}”
            </p>
          )}
          <div className="mt-2.5 flex items-center gap-2">
            <Button
              size="sm"
              onClick={handleAccept}
              disabled={busy}
              className="h-8 flex-1 gap-1.5 bg-teal-500 font-bold text-black hover:bg-teal-600"
            >
              {accepting ? <Loader2 className="h-3.5 w-3.5 animate-spin" /> : <Check className="h-3.5 w-3.5" />}
              Accept
            </Button>
            <Button
              size="sm"
              variant="outline"
              onClick={handleDecline}
              disabled={busy}
              className="h-8 gap-1.5 border-white/15 text-gray-400 hover:bg-white/10 hover:text-white"
            >
              {declining ? <Loader2 className="h-3.5 w-3.5 animate-spin" /> : <X className="h-3.5 w-3.5" />}
              Decline
            </Button>
          </div>
        </div>
      </div>
    </div>
  );
}

// Keep a tiny local encoder to avoid importing nip19 into every card render path.
import { nip19 } from 'nostr-tools';
function inviterNpubSafe(pubkey: string): string {
  try {
    return nip19.npubEncode(pubkey);
  } catch {
    return pubkey;
  }
}