import { Link, useNavigate } from 'react-router-dom';
import { nip19 } from 'nostr-tools';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { Avatar, AvatarFallback, AvatarImage } from '@/components/ui/avatar';
import { Badge } from '@/components/ui/badge';
import { Skeleton } from '@/components/ui/skeleton';
import { Button } from '@/components/ui/button';
import { useWhosSkatingAtSpot, SKATING_STATUSES } from '@/hooks/useUserStatus';
import { useAuthor } from '@/hooks/useAuthor';
import { genUserName } from '@/lib/genUserName';

import { Users, MessageCircle } from 'lucide-react';
import { cn } from '@/lib/utils';

interface WhosSkatingProps {
  spotPubkey: string;
  spotIdentifier: string;
  className?: string;
}

function SkaterCard({ pubkey, status, emoji }: { pubkey: string; status: string; emoji?: string }) {
  const navigate = useNavigate();
  const { data: authorData, isLoading } = useAuthor(pubkey);
  const metadata = authorData?.metadata;
  const displayName = metadata?.name ?? genUserName(pubkey);
  const npub = nip19.npubEncode(pubkey);

  if (isLoading) {
    return (
      <div className="flex items-center gap-3 p-3 rounded-lg bg-black/50">
        <Skeleton className="h-10 w-10 rounded-full" />
        <div className="flex-1">
          <Skeleton className="h-4 w-24 mb-1" />
          <Skeleton className="h-3 w-16" />
        </div>
      </div>
    );
  }

  return (
    <Link 
      to={`/${npub}`}
      className="block"
    >
      <div className="flex items-center gap-3 p-3 rounded-lg bg-black/50 hover:bg-black/70 transition-colors border border-transparent hover:border-[#ccff00]/30">
        <div className="relative">
          <Avatar className="h-10 w-10 border-2 border-green-500/50">
            <AvatarImage src={metadata?.picture} alt={displayName} />
            <AvatarFallback className="bg-green-500/20 text-green-400 font-bold">
              {displayName.slice(0, 2).toUpperCase()}
            </AvatarFallback>
          </Avatar>
          {/* Online indicator */}
          <span className="absolute -bottom-0.5 -right-0.5 flex h-3.5 w-3.5">
            <span className="animate-ping absolute inline-flex h-full w-full rounded-full bg-green-400 opacity-75" />
            <span className="relative inline-flex rounded-full h-3.5 w-3.5 bg-green-500 border-2 border-black" />
          </span>
        </div>
        <div className="flex-1 min-w-0">
          <p className="font-bold text-white text-sm truncate">{displayName}</p>
          <p className="text-xs text-green-400 truncate">
            {emoji} {status}
          </p>
        </div>
        <Button
          variant="ghost"
          size="sm"
          className="h-8 w-8 p-0 text-gray-400 hover:text-[#ccff00]"
          onClick={(e) => {
            e.preventDefault();
            e.stopPropagation();
            // Client-side navigation (HashRouter). Using window.location.href
            // here caused a full reload to a non-hash path the router couldn't
            // match — a broken jump. useNavigate keeps it in-app and instant.
            navigate(`/messages/${npub}`);
          }}
        >
          <MessageCircle className="h-4 w-4" />
        </Button>
      </div>
    </Link>
  );
}

export function WhosSkating({ spotPubkey, spotIdentifier, className }: WhosSkatingProps) {
  const { data: skatersAtSpot, isLoading } = useWhosSkatingAtSpot(spotPubkey, spotIdentifier);

  // Don't show if no one is skating
  if (!isLoading && (!skatersAtSpot || skatersAtSpot.length === 0)) {
    return null;
  }

  return (
    <Card className={cn('bg-gradient-to-br from-green-500/10 to-[#ccff00]/10 border-2 border-green-500/30', className)}>
      <CardHeader className="pb-3">
        <CardTitle className="text-lg flex items-center gap-2">
          <span className="relative flex">
            <span className="animate-ping absolute inline-flex h-3 w-3 rounded-full bg-green-400 opacity-75" />
            <span className="relative inline-flex h-3 w-3 rounded-full bg-green-500" />
          </span>
          <Users className="h-5 w-5 text-green-400" />
          Who's Skating
          {skatersAtSpot && skatersAtSpot.length > 0 && (
            <Badge className="bg-green-500/20 text-green-400 border-green-500/50">
              {skatersAtSpot.length}
            </Badge>
          )}
        </CardTitle>
      </CardHeader>
      <CardContent className="space-y-2">
        {isLoading ? (
          <>
            <Skeleton className="h-16 w-full rounded-lg" />
            <Skeleton className="h-16 w-full rounded-lg" />
          </>
        ) : skatersAtSpot && skatersAtSpot.length > 0 ? (
          <>
            {skatersAtSpot.slice(0, 5).map((skater) => {
              const preset = skater.statusId
                ? SKATING_STATUSES.find(s => s.id === skater.statusId)
                : null;
              return (
                <SkaterCard
                  key={skater.pubkey}
                  pubkey={skater.pubkey}
                  status={preset?.label || skater.status}
                  emoji={skater.emoji || preset?.emoji || '🛹'}
                />
              );
            })}
            {skatersAtSpot.length > 5 && (
              <p className="text-xs text-gray-400 text-center pt-2">
                +{skatersAtSpot.length - 5} more
              </p>
            )}
          </>
        ) : null}
      </CardContent>
    </Card>
  );
}