import { type ReactNode } from 'react';
import { TrkSectionHeader, Trk } from '../lib/Trk';
import { Badge } from '@shared/components/ui/badge';
import type { BadgeIntent } from '@lib/theme/variants';
import { CATALOG_REGISTRY, type CatalogEntry } from '@shared/constants/catalogRegistry';

/**
 * 카탈로그 섹션 — `CATALOG_REGISTRY`를 자동 열거.
 * 새 카탈로그 추가는 `catalogRegistry.ts`에 한 줄 추가하면 끝.
 * 여기는 렌더링 로직만 담당.
 */

interface AnyMeta {
  code: string;
  intent?: BadgeIntent;
  fallback?: { ko: string; en: string };
  classes?: string | { bg?: string; text?: string; border?: string };
  label?: string;
}

function getKoLabel(meta: AnyMeta): string {
  return meta.fallback?.ko ?? meta.label ?? meta.code;
}

function getEnLabel(meta: AnyMeta): string | undefined {
  return meta.fallback?.en;
}

function getFallbackClasses(meta: AnyMeta): string | undefined {
  if (typeof meta.classes === 'string') return meta.classes;
  if (typeof meta.classes === 'object' && meta.classes) {
    return [meta.classes.bg, meta.classes.text, meta.classes.border].filter(Boolean).join(' ');
  }
  return undefined;
}

function renderBadge(meta: AnyMeta, label: string): ReactNode {
  if (meta.intent) {
    return (
      <Badge intent={meta.intent} size="sm">
        {label}
      </Badge>
    );
  }
  const classes =
    getFallbackClasses(meta) ??
    'bg-slate-100 text-slate-700 border-slate-300 dark:bg-slate-500/20 dark:text-slate-300 dark:border-slate-500/30';
  return (
    <span
      className={`inline-flex items-center px-2 py-0.5 rounded-md border text-[12px] font-semibold ${classes}`}
    >
      {label}
    </span>
  );
}

function CatalogBadges({ entry }: { entry: CatalogEntry }) {
  const items = Object.values(entry.items) as AnyMeta[];
  return (
    <div className="space-y-1.5">
      {items.map((meta) => {
        const koLabel = getKoLabel(meta);
        const enLabel = getEnLabel(meta);
        const trkId = `${entry.showcaseId}-${meta.code}`;
        return (
          <Trk key={meta.code} id={trkId} className="flex items-center gap-3 rounded-sm">
            <code className="text-[10px] text-hint font-mono whitespace-nowrap w-32 shrink-0 truncate">
              {meta.code}
            </code>
            <div className="flex-1">{renderBadge(meta, koLabel)}</div>
            <div className="flex-1">
              {enLabel ? (
                renderBadge(meta, enLabel)
              ) : (
                <span className="text-[10px] text-hint italic">(no en)</span>
              )}
            </div>
          </Trk>
        );
      })}
    </div>
  );
}

export function CatalogSection() {
  return (
    <>
      <TrkSectionHeader
        id="TRK-SEC-catalog"
        title={`분류 카탈로그 (${CATALOG_REGISTRY.length}+)`}
        description="백엔드 enum/code_master 기반 SSOT. 쇼케이스와 실 페이지가 동일 레지스트리 참조."
      />

      <Trk id="TRK-CAT-intro" className="ds-sample mb-4">
        <p className="text-xs text-label leading-relaxed">
          페이지에서 배지를 렌더할 때는 반드시 카탈로그 API를 사용한다 (라벨/intent/색상 단일 관리):
        </p>
        <code className="ds-code mt-2">
          {`import { getAlertLevelIntent, getAlertLevelLabel } from '@shared/constants/alertLevels';

<Badge intent={getAlertLevelIntent(event.level)} size="sm">
  {getAlertLevelLabel(event.level, t, lang)}
</Badge>`}
        </code>
        <p className="text-[11px] text-hint mt-2">
          <strong>새 카탈로그 추가</strong>: <code className="font-mono">shared/constants/catalogRegistry.ts</code>에
          항목을 추가하면 이 쇼케이스에 자동 노출됩니다.
        </p>
      </Trk>

      {CATALOG_REGISTRY.map((entry) => (
        <Trk key={entry.id} id={entry.showcaseId} className="ds-sample mb-3">
          <div className="mb-2">
            <div className="flex items-baseline gap-2 flex-wrap">
              <h3 className="text-sm font-semibold text-heading">
                {entry.titleKo} · {entry.titleEn}
              </h3>
              <code className="text-[10px] text-hint font-mono">{entry.showcaseId}</code>
            </div>
            <p className="text-[11px] text-hint">{entry.description}</p>
            {entry.source && (
              <p className="text-[10px] text-hint italic mt-0.5">출처: {entry.source}</p>
            )}
          </div>
          <CatalogBadges entry={entry} />
        </Trk>
      ))}
    </>
  );
}