import { useState } from 'react';
import { Link } from 'react-router-dom';
import { nip19 } from 'nostr-tools';
import { ExternalLink, ShieldCheck } from 'lucide-react';
import { Avatar, AvatarFallback, AvatarImage } from '@/components/ui/avatar';
import { ProfileBadges } from '@/components/ProfileBadges';
import { useCurrentUser } from '@/hooks/useCurrentUser';
import { isSkateSpotsNip05, profileBadges } from '@/lib/badges';
import { useTranslation } from '@/contexts/language';
import { cn } from '@/lib/utils';

/**
 * A live preview of how the signed-in user appears to everyone else — banner,
 * avatar, handle, bio and badges — shown at the top of the Edit Profile screen
 * so "how do I look?" has an answer without leaving the page.
 *
 * Reads the same kind-0 metadata the form edits, so it reflects the last SAVED
 * profile (the form's unsaved edits aren't shown; the sticky Save button commits).
 */
export function ProfilePreviewCard({ className }: { className?: string }) {
  const { user, metadata, isLoadingProfile } = useCurrentUser();
  const { t } = useTranslation();
  const [bannerOk, setBannerOk] = useState(true);

  if (!user) return null;

  const name = metadata?.display_name || metadata?.name || '';
  const initials = (name || user.pubkey.slice(0, 2)).slice(0, 2).toUpperCase();
  const nip05 = metadata?.nip05;
  const about = metadata?.about?.trim();
  const badges = profileBadges(metadata);

  return (
    <div className={cn('overflow-hidden rounded-2xl border border-white/10 bg-white/2', className)}>
      {/* Banner (falls back to the brand gradient) */}
      <div className="relative h-28 w-full bg-gradient-to-r from-[#ff0040]/25 via-[#ff6600]/15 to-[#ccff00]/20">
        {metadata?.banner && bannerOk && (
          <img
            src={metadata.banner}
            alt=""
            className="h-full w-full object-cover"
            onError={() => setBannerOk(false)}
          />
        )}
        <div className="absolute inset-0 bg-gradient-to-t from-black/60 via-black/10 to-transparent" />
        <Link
          to={`/${nip19.npubEncode(user.pubkey)}`}
          className="absolute right-2 top-2 inline-flex items-center gap-1.5 rounded-full bg-black/55 px-3 py-1.5 text-xs font-bold text-white backdrop-blur transition-colors hover:bg-black/75"
        >
          {t('labUi.profilePreview.viewPublic')}
          <ExternalLink className="h-3 w-3" />
        </Link>
      </div>

      {/* Identity */}
      <div className="px-4 pb-4">
        <div className="flex items-end gap-3">
          <Avatar className="-mt-10 h-20 w-20 border-4 border-background shadow-lg">
            {metadata?.picture && <AvatarImage src={metadata.picture} alt={name} />}
            <AvatarFallback className="text-lg font-black">{initials}</AvatarFallback>
          </Avatar>
          <div className="min-w-0 flex-1 pb-1">
            <p className="truncate text-lg font-black leading-tight text-white">
              {name || (isLoadingProfile ? t('common.loading') : t('labUi.profilePreview.unnamed'))}
            </p>
            {nip05 ? (
              <span
                className={cn(
                  'mt-0.5 inline-flex items-center gap-1 text-xs font-bold',
                  isSkateSpotsNip05(nip05) ? 'text-[#ccff00]' : 'text-blue-400',
                )}
              >
                <ShieldCheck className="h-3.5 w-3.5 flex-shrink-0" />
                <span className="truncate">{nip05}</span>
              </span>
            ) : (
              <span className="mt-0.5 block text-xs text-muted-foreground">{t('labUi.profilePreview.noHandle')}</span>
            )}
          </div>
        </div>

        {about && <p className="mt-3 line-clamp-3 text-sm leading-relaxed text-muted-foreground">{about}</p>}

        {badges.length > 0 && <ProfileBadges badges={badges} size="sm" className="mt-3" />}
      </div>
    </div>
  );
}