import { useState } from 'react';
import { AlertTriangle, Flag } from 'lucide-react';

import { Button } from '@/components/ui/button';
import { ReportDialog } from '@/components/ReportDialog';
import { useTrustBucket } from '@/hooks/useTrustBucket';
import { useUserReports } from '@/hooks/useUserReports';
import { useBatchTrustScores } from '@/hooks/useBatchTrustScores';
import { useMuteUser } from '@/hooks/useMuteUser';
import { FLAGGED_REPORTERS_THRESHOLD } from '@/lib/trustLadder';
import { useTranslation } from '@/contexts/language';
import { cn } from '@/lib/utils';

interface TrustFlaggedNoticeProps {
  pubkey: string;
  targetTitle?: string;
  className?: string;
}

/**
 * A safety notice for a flagged counterparty (seller, coach, organiser). It is
 * informational, not an automatic takedown: it shows that trusted people
 * reported the account, breaks the reporters down by the viewer's own network,
 * and offers Report / Dismiss. Dismissal is session-only — a safety signal
 * reappears on the next visit rather than staying hidden forever.
 */
export function TrustFlaggedNotice({ pubkey, targetTitle, className }: TrustFlaggedNoticeProps) {
  const { t } = useTranslation();
  const { bucket, assertion } = useTrustBucket(pubkey);
  const { reporterPubkeys, reporterCount } = useUserReports(pubkey);
  const { data: scores } = useBatchTrustScores(reporterPubkeys);
  const [dismissed, setDismissed] = useState(false);
  const [reportOpen, setReportOpen] = useState(false);
  const muteUser = useMuteUser();

  const flagged = bucket === 'flagged' || reporterCount >= FLAGGED_REPORTERS_THRESHOLD;
  if (!flagged || dismissed) return null;

  let follow = 0;
  let network = 0;
  let other = 0;
  for (const pk of reporterPubkeys) {
    const score = scores?.get(pk);
    if (score !== undefined && score >= 90) follow += 1;
    else if (score === 60) network += 1;
    else other += 1;
  }

  const trustedCount = assertion?.reporters ?? reporterCount;

  return (
    <div className={cn('rounded-2xl border-2 border-red-500/40 bg-red-500/10 p-4', className)}>
      <div className="flex items-start gap-3">
        <AlertTriangle className="mt-0.5 h-5 w-5 shrink-0 text-red-400" />
        <div className="min-w-0 flex-1">
          <p className="text-sm font-black uppercase tracking-wide text-red-300">
            {t('walletUi.trust.flaggedNoticeTitle')}
          </p>
          <p className="mt-1 text-xs leading-relaxed text-gray-300">
            {t('walletUi.trust.flaggedNoticeDesc')}
          </p>
          {trustedCount > 0 && (
            <p className="mt-1 text-xs text-gray-400">
              {t('walletUi.trust.reportedByTrusted', { count: trustedCount })}
            </p>
          )}

          {(follow > 0 || network > 0 || other > 0) && (
            <div className="mt-2 flex flex-wrap gap-1.5">
              {follow > 0 && (
                <Chip label={t('walletUi.trust.flaggedReporterFollow', { count: follow })} />
              )}
              {network > 0 && (
                <Chip label={t('walletUi.trust.flaggedReporterNetwork', { count: network })} />
              )}
              {other > 0 && (
                <Chip label={t('walletUi.trust.flaggedReporterOther', { count: other })} />
              )}
            </div>
          )}

          <div className="mt-3 flex gap-2">
            <Button
              size="sm"
              variant="outline"
              className="h-8 min-h-0 gap-1.5 border-red-500/40 text-red-300 hover:bg-red-500/10"
              onClick={() => setReportOpen(true)}
            >
              <Flag className="h-3.5 w-3.5" />
              {t('walletUi.trust.flaggedReport')}
            </Button>
            <Button
              size="sm"
              variant="outline"
              className="h-8 min-h-0"
              disabled={muteUser.isPending}
              onClick={() => muteUser.mutate(pubkey, { onSuccess: () => setDismissed(true) })}
            >
              {t('walletUi.trust.mute')}
            </Button>
            <Button
              size="sm"
              variant="ghost"
              className="h-8 min-h-0 text-gray-400"
              onClick={() => setDismissed(true)}
            >
              {t('walletUi.trust.flaggedDismiss')}
            </Button>
          </div>
        </div>
      </div>

      <ReportDialog
        open={reportOpen}
        onOpenChange={setReportOpen}
        targetType="user"
        targetPubkey={pubkey}
        targetTitle={targetTitle}
      />
    </div>
  );
}

function Chip({ label }: { label: string }) {
  return (
    <span className="rounded-full bg-red-500/15 px-2 py-0.5 text-[10px] font-medium text-red-200">
      {label}
    </span>
  );
}