// WCAG 2.x 상대 명도 대비 검사. node tools/contrast.mjs
const hex = h => h.replace('#','').match(/../g).map(x => parseInt(x,16)/255)
const lin = c => c <= 0.03928 ? c/12.92 : Math.pow((c+0.055)/1.055, 2.4)
const L = h => { const [r,g,b] = hex(h).map(lin); return 0.2126*r + 0.7152*g + 0.0722*b }
const ratio = (a,b) => { const l1 = L(a), l2 = L(b); const [hi,lo] = l1>l2 ? [l1,l2] : [l2,l1]; return (hi+0.05)/(lo+0.05) }

const themes = {
  dark: {
    surface: '#0D0F12', raised: '#151A20', line: '#262E37',
    ink: '#E6E8E6', inkMuted: '#9BA6B2', accent: '#7FA6FF',
    ctaBg: '#E6E8E6', ctaInk: '#0D0F12',
    ok: '#4FA97A', warn: '#C9A227', fail: '#D46A55',
  },
  light: {
    surface: '#F7F5F0', raised: '#FDFCF9', line: '#DCD8CF',
    ink: '#16181A', inkMuted: '#5C646E', accent: '#1B4FD8',
    ctaBg: '#16181A', ctaInk: '#FAF9F6',
    ok: '#2F7D57', warn: '#8A6D14', fail: '#A8432E',
  },
}

// [라벨, 전경, 배경키, 최소요구]
const checks = [
  ['본문 ink / surface',        'ink',      'surface', 4.5],
  ['본문 ink / raised',         'ink',      'raised',  4.5],
  ['보조 inkMuted / surface',   'inkMuted', 'surface', 4.5],
  ['보조 inkMuted / raised',    'inkMuted', 'raised',  4.5],
  ['링크 accent / surface',     'accent',   'surface', 4.5],
  ['링크 accent / raised',      'accent',   'raised',  4.5],
  ['상태 ok / raised',          'ok',       'raised',  4.5],
  ['상태 warn / raised',        'warn',     'raised',  4.5],
  ['상태 fail / raised',        'fail',     'raised',  4.5],
]

let fail = 0
for (const [name, t] of Object.entries(themes)) {
  console.log(`\n=== ${name} ===`)
  for (const [label, fg, bg, min] of checks) {
    const r = ratio(t[fg], t[bg])
    const ok = r >= min
    if (!ok) fail++
    console.log(`${ok ? 'PASS' : 'FAIL'}  ${r.toFixed(2)}:1  (min ${min})  ${label}  ${t[fg]} on ${t[bg]}`)
  }
  const r = ratio(t.ctaInk, t.ctaBg)
  const ok = r >= 4.5
  if (!ok) fail++
  console.log(`${ok ? 'PASS' : 'FAIL'}  ${r.toFixed(2)}:1  (min 4.5)  CTA 글자/버튼  ${t.ctaInk} on ${t.ctaBg}`)
  // 하드게이트 #7: 버튼 텍스트/배경 대비
  const rb = ratio(t.line, t.surface)
  console.log(`INFO  ${rb.toFixed(2)}:1            경계선 line / surface (3:1 미만이면 비필수 장식으로만)`)
}
console.log(fail === 0 ? '\n전부 통과' : `\n${fail}건 실패`)