/**
 * Hwatu card drawn in SVG (our own simple artwork, no commercial hwatu images — docs/games/seotda.md §12).
 * Large month number + kind badge so the card is readable without knowing the pictures.
 */
import type { CSSProperties, ReactNode } from 'react';

export interface HwatuInfo {
  id: number;
  month: number; // 0 for bonus
  kind: 'gwang' | 'yeol' | 'tti' | 'pi' | 'ssangpi' | 'bonus';
  tti?: 'hong' | 'cheong' | 'cho' | 'plain';
  name: string;
  piValue?: number;
}

const MONTH_COLOR = ['#6b7280', '#15803d', '#be185d', '#db2777', '#1f2937', '#7c3aed', '#dc2626', '#b91c1c', '#111827', '#ca8a04', '#c2410c', '#7c2d12', '#1e40af'];
const MONTH_NAME = ['보너스', '송학', '매조', '벚꽃', '흑싸리', '난초', '모란', '홍싸리', '공산', '국화', '단풍', '오동', '비'];
const KIND_BADGE: Record<HwatuInfo['kind'], string> = { gwang: '光', yeol: '열', tti: '띠', pi: '피', ssangpi: '쌍피', bonus: '+' };
const TTI_COLOR = { hong: '#dc2626', cheong: '#2563eb', cho: '#15803d', plain: '#dc2626' };
const TTI_TEXT = { hong: '홍단', cheong: '청단', cho: '', plain: '' };

/** A small motif per month (flowers/plants), drawn with basic shapes. */
function Motif({ month, color }: { month: number; color: string }): ReactNode {
  const c = color;
  switch (month) {
    case 1: // 송학: pine
      return <path d="M50 52 L28 92 H72 Z M50 72 L22 116 H78 Z" fill={c} opacity="0.85" />;
    case 2: // 매조: plum blossoms
    case 3: // 벚꽃
      return (
        <g fill={c} opacity="0.85">
          {[[34, 70], [62, 62], [50, 92], [70, 100], [30, 108]].map(([x, y], i) => (
            <circle key={i} cx={x} cy={y} r="10" />
          ))}
        </g>
      );
    case 4: // 흑싸리
    case 7: // 홍싸리
      return (
        <g stroke={c} strokeWidth="5" strokeLinecap="round" opacity="0.85">
          {[30, 45, 60, 75].map((x, i) => (
            <line key={i} x1={x} y1="52" x2={x - 6} y2={100 + (i % 2) * 14} />
          ))}
        </g>
      );
    case 5: // 난초: iris leaves
      return (
        <g fill="none" stroke={c} strokeWidth="5" opacity="0.85">
          <path d="M40 120 Q34 80 44 52" />
          <path d="M55 120 Q62 84 52 54" />
          <path d="M70 120 Q76 92 68 64" />
        </g>
      );
    case 6: // 모란: peony
      return (
        <g fill={c} opacity="0.85">
          <circle cx="50" cy="86" r="22" />
          <circle cx="50" cy="86" r="10" fill="#fde68a" />
        </g>
      );
    case 8: // 공산: hill
      return <path d="M8 120 Q50 52 92 120 Z" fill={c} opacity="0.85" />;
    case 9: // 국화
      return (
        <g fill={c} opacity="0.9">
          {Array.from({ length: 10 }, (_, i) => {
            const a = (i / 10) * Math.PI * 2;
            return <ellipse key={i} cx={50 + Math.cos(a) * 14} cy={88 + Math.sin(a) * 14} rx="8" ry="4" transform={`rotate(${(a * 180) / Math.PI} ${50 + Math.cos(a) * 14} ${88 + Math.sin(a) * 14})`} />;
          })}
          <circle cx="50" cy="88" r="7" fill="#78350f" />
        </g>
      );
    case 10: // 단풍: maple
      return <path d="M50 58 L58 78 L78 74 L64 90 L74 108 L50 98 L26 108 L36 90 L22 74 L42 78 Z" fill={c} opacity="0.9" />;
    case 11: // 오동
      return (
        <g fill={c} opacity="0.85">
          <ellipse cx="38" cy="82" rx="16" ry="22" />
          <ellipse cx="64" cy="94" rx="16" ry="22" />
        </g>
      );
    case 12: // 비: rain lines + umbrella
      return (
        <g stroke={c} strokeWidth="3" opacity="0.85">
          {[20, 35, 50, 65, 80].map((x) => (
            <line key={x} x1={x} y1="54" x2={x - 8} y2="118" />
          ))}
        </g>
      );
    default:
      return <text x="50" y="98" fontSize="36" textAnchor="middle" fill={c}>★</text>;
  }
}

export type HwatuSize = 'sm' | 'md' | 'lg';
const WIDTH: Record<HwatuSize, number> = { sm: 40, md: 60, lg: 84 };

export function HwatuCard({
  card,
  size = 'md',
  selected,
  dimmed,
  highlight,
  onClick,
  style,
}: {
  card: HwatuInfo | null;
  size?: HwatuSize;
  selected?: boolean;
  dimmed?: boolean;
  highlight?: boolean;
  onClick?: () => void;
  style?: CSSProperties;
}) {
  const w = WIDTH[size];
  const h = Math.round(w * 1.6);
  const Tag = onClick ? 'button' : 'span';
  const s: CSSProperties = {
    width: w,
    height: h,
    flex: 'none',
    display: 'inline-block',
    padding: 0,
    border: 0,
    background: 'none',
    cursor: onClick ? 'pointer' : 'default',
    opacity: dimmed ? 0.45 : 1,
    transform: selected ? `translateY(${-Math.round(w * 0.2)}px)` : undefined,
    transition: 'transform 0.12s ease',
    filter: highlight ? 'drop-shadow(0 0 6px #f59e0b)' : 'drop-shadow(0 1px 2px rgba(0,0,0,0.3))',
    ...style,
  };
  if (!card) {
    return (
      <Tag style={s} onClick={onClick} aria-label="뒤집힌 화투">
        <svg viewBox="0 0 100 160" width={w} height={h} aria-hidden>
          <rect x="1" y="1" width="98" height="158" rx="8" fill="#991b1b" stroke="#450a0a" strokeWidth="3" />
          <rect x="10" y="10" width="80" height="140" rx="5" fill="#b91c1c" />
        </svg>
      </Tag>
    );
  }
  const color = MONTH_COLOR[card.month] ?? '#374151';
  return (
    <Tag style={s} onClick={onClick} aria-label={card.name} aria-pressed={onClick ? !!selected : undefined} title={card.name}>
      <svg viewBox="0 0 100 160" width={w} height={h} aria-hidden>
        <rect x="1" y="1" width="98" height="158" rx="8" fill="#fffaf0" stroke={selected ? '#2563eb' : '#1f2937'} strokeWidth={selected ? 6 : 3} />
        {card.kind === 'bonus' ? (
          <text x="50" y="102" fontSize="34" fontWeight="900" fill="#b45309" textAnchor="middle" fontFamily="Pretendard Variable, sans-serif">
            {card.piValue ?? 2}피
          </text>
        ) : (
          <Motif month={card.month} color={color} />
        )}
        {card.kind === 'tti' && (
          <g>
            <rect x="58" y="30" width="18" height="90" rx="3" fill={TTI_COLOR[card.tti ?? 'plain']} />
            {TTI_TEXT[card.tti ?? 'plain'] && (
              <text x="67" y="62" fontSize="13" fontWeight="800" fill="#fff" textAnchor="middle" style={{ writingMode: 'vertical-rl' } as CSSProperties}>
                {TTI_TEXT[card.tti ?? 'plain']}
              </text>
            )}
          </g>
        )}
        {(card.kind === 'gwang' || card.kind === 'yeol') && (
          <g>
            <circle cx="78" cy="120" r="15" fill={card.kind === 'gwang' ? '#dc2626' : '#a16207'} />
            <text x="78" y="127" fontSize={card.kind === 'gwang' ? 20 : 16} fontWeight="800" fill="#fff" textAnchor="middle">
              {card.kind === 'gwang' ? '光' : '열'}
            </text>
          </g>
        )}
        {/* Month number: large and always readable */}
        <rect x="6" y="6" width="38" height="38" rx="8" fill={color} />
        <text x="25" y="35" fontSize="28" fontWeight="900" fill="#fff" textAnchor="middle" fontFamily="Pretendard Variable, sans-serif">
          {card.month || '+'}
        </text>
        <text x="50" y="154" fontSize="13" fontWeight="700" fill="#374151" textAnchor="middle" fontFamily="Pretendard Variable, sans-serif">
          {MONTH_NAME[card.month]} · {card.kind === 'bonus' ? `${card.piValue ?? 2}피` : card.kind === 'tti' ? (TTI_TEXT[card.tti ?? 'plain'] || '띠') : KIND_BADGE[card.kind] === '光' ? '광' : KIND_BADGE[card.kind] === '열' ? '열끗' : KIND_BADGE[card.kind]}
        </text>
      </svg>
    </Tag>
  );
}