import { dateLocaleCode } from '@/lib/dateFnsI18n';
import { Link } from 'react-router-dom';
import type { NostrEvent } from '@nostrify/nostrify';
import { Star, ThumbsUp, ArrowUpRight } from 'lucide-react';
import { Card, CardContent } from '@/components/ui/card';
import { Skeleton } from '@/components/ui/skeleton';
import { Avatar, AvatarFallback, AvatarImage } from '@/components/ui/avatar';
import { TradeReputationCard } from '@/components/TradeReputationCard';
import { TradeRecommendationsCard } from '@/components/TradeRecommendationsCard';
import { DeckRating } from '@/components/DeckRating';
import { useTradeReputation, TRADE_METHODS, type TradeRole } from '@/hooks/useTradeAttestations';
import { useAuthor } from '@/hooks/useAuthor';
import { genUserName } from '@/lib/genUserName';
import { cn } from '@/lib/utils';
import { useTranslation } from '@/contexts/language';

/** One trade record / review row. */
function ReviewRow({ ev, selfPubkey }: { ev: NostrEvent; selfPubkey: string }) {
  const { t } = useTranslation();
  const role = ev.tags.find(([t]) => t === 'd')?.[1]?.split(':')[2] as TradeRole | undefined;
  const counterparty = ev.tags.find(([t]) => t === 'p')?.[1] ?? '';
  const method = ev.tags.find(([t]) => t === 'method')?.[1];
  const amount = ev.tags.find(([t]) => t === 'amount')?.[1];
  const rating = Number(ev.tags.find(([t]) => t === 'rating')?.[1] ?? 0);
  const coord = ev.tags.find(([t]) => t === 'a')?.[1] ?? '';
  const [, listingPubkey, listingId] = coord.split(':');

  const author = useAuthor(counterparty);
  const name = author.data?.metadata?.name ?? genUserName(counterparty);
  const picture = author.data?.metadata?.picture;

  const given = ev.pubkey === selfPubkey;
  const date = new Date(ev.created_at * 1000).toLocaleDateString(dateLocaleCode());

  return (
    <div className="flex items-start gap-3 rounded-xl border border-white/8 bg-white/[0.03] p-3">
      <Avatar className="h-9 w-9 shrink-0">
        <AvatarImage src={picture} alt={name} />
        <AvatarFallback className="bg-white/10 text-[10px] font-bold text-gray-300">
          {name.slice(0, 2).toUpperCase()}
        </AvatarFallback>
      </Avatar>
      <div className="min-w-0 flex-1">
        <div className="flex flex-wrap items-center gap-1.5 text-sm">
          <Link to={`/${encodeURIComponent(counterparty)}`} className="font-bold text-white hover:text-[#ccff00]">
            {name}
          </Link>
          <span
            className={cn(
              'rounded px-1.5 py-0.5 text-[9px] font-black uppercase tracking-wide',
              role === 'sold' ? 'bg-[#ccff00]/15 text-[#ccff00]' : 'bg-sky-500/15 text-sky-300',
            )}
          >
            {role === 'sold' ? t('marketUi.trades.roleSold') : t('marketUi.trades.roleBought')}
          </span>
          {!given && <span className="text-[9px] font-bold uppercase tracking-wide text-emerald-400">★ {t('marketUi.reputationPanel.reviewOfYou')}</span>}
          {given && <span className="text-[9px] font-bold uppercase tracking-wide text-gray-500">{t('marketUi.reputationPanel.yourRecord')}</span>}
          {rating > 0 && <DeckRating value={rating} compact className="ml-auto" />}
        </div>
        {ev.content && <p className="mt-1 line-clamp-2 text-xs text-gray-300">{ev.content}</p>}
        <div className="mt-1 flex flex-wrap items-center gap-x-3 gap-y-0.5 text-[11px] text-gray-500">
          {method && <span>{TRADE_METHODS[method as keyof typeof TRADE_METHODS] ?? method}</span>}
          {amount && <span>{Number(amount).toLocaleString()} {t('common.sats')}</span>}
          <span>{date}</span>
          {listingPubkey && listingId && (
            <Link to={`/listing/${listingPubkey}/${listingId}`} className="inline-flex items-center gap-0.5 text-gray-400 hover:text-[#ccff00]">
              {t('marketUi.reputationPanel.listing')} <ArrowUpRight className="h-3 w-3" />
            </Link>
          )}
        </div>
      </div>
    </div>
  );
}

/** Loading placeholder shaped like a review row. */
function ReviewSkeleton() {
  return (
    <div className="flex items-start gap-3 rounded-xl border border-white/8 bg-white/[0.03] p-3">
      <Skeleton className="h-9 w-9 shrink-0 rounded-full" />
      <div className="min-w-0 flex-1 space-y-2">
        <Skeleton className="h-3.5 w-40" />
        <Skeleton className="h-3 w-full" />
        <Skeleton className="h-3 w-24" />
      </div>
    </div>
  );
}

/**
 * Marketplace → Reputation tab: this trader's reputation, peer recommendations,
 * and their trade records / reviews (from kind-31871 attestations).
 */
export function TradeReputationPanel({ pubkey }: { pubkey: string }) {
  const { t } = useTranslation();
  const { data, isLoading } = useTradeReputation(pubkey);
  const attestations = [...(data?.attestations ?? [])].sort((a, b) => b.created_at - a.created_at);
  const reviews = attestations.filter((a) => a.pubkey !== pubkey);
  const ratings = attestations
    .map((a) => Number(a.tags.find(([t]) => t === 'rating')?.[1] ?? 0))
    .filter((n) => n >= 1 && n <= 10);
  const avg = ratings.length ? ratings.reduce((s, n) => s + n, 0) / ratings.length : 0;

  return (
    <div className="space-y-6">
      <TradeReputationCard pubkey={pubkey} />
      {avg > 0 && (
        <div className="flex items-center gap-3 rounded-xl border border-[#ccff00]/20 bg-[#ccff00]/5 px-3 py-2.5">
          <span className="text-lg font-black tabular-nums text-[#ccff00]">{avg.toFixed(1)}/10</span>
          <DeckRating value={Math.round(avg)} compact className="text-[#ccff00]" />
          <span className="text-xs text-gray-400">
            {ratings.length === 1 ? t('marketUi.reputationPanel.averageOne', { count: ratings.length }) : t('marketUi.reputationPanel.averageMany', { count: ratings.length })}
          </span>
        </div>
      )}
      <TradeRecommendationsCard pubkey={pubkey} />

      <div>
        <h3 className="mb-3 flex items-center gap-2 text-sm font-black uppercase tracking-wide text-white">
          <Star className="h-4 w-4 text-[#ccff00]" />
          {t('marketUi.reputationPanel.reviewsTitle')}
          {reviews.length > 0 && (
            <span className="rounded-full bg-[#ccff00]/15 px-2 py-0.5 text-[10px] font-bold text-[#ccff00]">
              {t('marketUi.reputationPanel.fromOthers', { count: reviews.length })}
            </span>
          )}
        </h3>

        {isLoading ? (
          <div className="space-y-2">
            <ReviewSkeleton />
            <ReviewSkeleton />
            <ReviewSkeleton />
          </div>
        ) : attestations.length === 0 ? (
          <Card className="border-dashed border-white/10">
            <CardContent className="py-10 text-center">
              <ThumbsUp className="mx-auto mb-3 h-8 w-8 text-gray-600" />
              <p className="text-sm text-gray-400">
                {t('marketUi.reputationPanel.emptyBefore')} <b>{t('marketUi.trades.title')}</b> {t('marketUi.reputationPanel.emptyAfter')}
              </p>
            </CardContent>
          </Card>
        ) : (
          <div className="space-y-2">
            {attestations.map((ev) => (
              <ReviewRow key={ev.id} ev={ev} selfPubkey={pubkey} />
            ))}
          </div>
        )}
      </div>
    </div>
  );
}