#!/usr/bin/env node
/**
 * verify-dark.mjs — S2-P5 暗色模式独立验证（不进 _runtime 计数，守住 1003 基数）
 *
 * 1) 令牌组存在且完整（html.aa-dark ≥15 个 --au-）
 * 2) 暗色文字/品牌/语义色在深底上的 WCAG 对比度（文本 ≥4.5:1）
 * 3) 浏览器实测：抽样 10 个组件演示页，切 aa-dark 后无白底残留、无黑字黑底，对比度可读
 *
 * 用法：node tools/verify-dark.mjs [--slugs button,input,...] [--shots]
 * 退出码：0 全过；1 有失败。
 */
import { readFileSync } from 'fs';
import { fileURLToPath } from 'url';
import { dirname, join } from 'path';

const __dirname = dirname(fileURLToPath(import.meta.url));
const ROOT = join(__dirname, '..');
const BASE = process.env.REG_BASE || 'http://127.0.0.1:3311';
const arg = (k) => {
  const i = process.argv.indexOf(k);
  return i > -1 ? process.argv[i + 1] : null;
};
const SAMPLE = (arg('--slugs') || 'button,input,select,table,card,modal,tabs,formmodal,sidemenu,tag').split(',');
const SHOTS = process.argv.includes('--shots');

function lum(hex) {
  const c = hex.replace('#', '');
  const f = (i) => {
    const v = parseInt(c.substr(i, 2), 16) / 255;
    return v <= 0.03928 ? v / 12.92 : Math.pow((v + 0.055) / 1.055, 2.4);
  };
  return 0.2126 * f(0) + 0.7152 * f(2) + 0.0722 * f(4);
}
function ratio(a, b) {
  const x = lum(a), y = lum(b);
  return (Math.max(x, y) + 0.05) / (Math.min(x, y) + 0.05);
}

let fail = 0;
const ok = (cond, msg) => {
  console.log((cond ? 'PASS' : 'FAIL') + ' ' + msg);
  if (!cond) fail++;
};

/* ---- 1) 令牌组 ---- */
const css = readFileSync(join(ROOT, '.design_library/aurora-admin/colors_and_type.css'), 'utf8');
ok(/html\.aa-dark/.test(css), '1) 令牌文件含 html.aa-dark 组');
const m = css.match(/html\.aa-dark\s*\{([^}]+)\}/s);
const n = m ? (m[1].match(/--au-/g) || []).length : 0;
ok(n >= 15, '1) 暗色令牌数 ' + n + '（预期 ≥15）');

/* ---- 2) 对比度 ---- */
const checks = [
  ['E8EAED', '1C1F26', 'title/卡片底'], ['C9CDD4', '1C1F26', 'body/卡片底'],
  ['9CA3AF', '1C1F26', 'secondary/卡片底'], ['9CA3AF', '14161C', 'placeholder/页面底'],
  ['6B8CFF', '1C1F26', 'brand/卡片底'], ['6B8CFF', '14161C', 'brand/页面底'],
  ['4CAF50', '1C1F26', 'success'], ['E5A300', '1C1F26', 'warning'],
  ['F26D6D', '1C1F26', 'error'], ['4C9AFF', '1C1F26', 'info']
];
for (const [f, b, label] of checks) {
  const r = ratio('#' + f, '#' + b);
  ok(r >= 4.5, '2) #' + f + '/#' + b + ' ' + r.toFixed(2) + ':1 ' + label);
}

/* ---- 3) 浏览器实测 ---- */
let chromium;
try {
  ({ chromium } = await import('playwright'));
} catch {
  console.error('[FATAL] 未安装 playwright');
  process.exit(2);
}
const browser = await chromium.launch();
/* slug → 演示文件名：data.json 的 files.html 即权威路径（小写 slug.html） */
let prefixOf = null;
try {
  const idx = await (await fetch(BASE + '/site/data.json')).json();
  const map = {};
  (idx.components || []).forEach((c) => { map[c.slug] = (c.files && c.files.html || '').split('/').pop() || (c.slug + '.html'); });
  prefixOf = (slug) => map[slug] || (slug + '.html');
} catch (e) {
  prefixOf = (slug) => slug + '.html';
}
try {
  for (const slug of SAMPLE) {
    const page = await browser.newPage({ viewport: { width: 1280, height: 800 } });
    const url = BASE + '/frameworks/' + prefixOf(slug);
    let status = 0;
    try {
      const resp = await page.goto(url, { waitUntil: 'load', timeout: 15000 });
      status = resp ? resp.status() : 0;
    } catch (e) {
      ok(false, '3) ' + slug + ' 页面加载失败 ' + e.message);
      await page.close();
      continue;
    }
    if (status !== 200) {
      ok(false, '3) ' + slug + ' 演示页 HTTP ' + status);
      await page.close();
      continue;
    }
    await page.evaluate(() => document.documentElement.classList.add('aa-dark'));
    await page.waitForTimeout(400);
    const res = await page.evaluate(() => {
      const bad = [];
      const els = document.querySelectorAll('body, body *');
      const lumH = (rgb) => {
        const m = rgb.match(/rgba?\(([^)]+)\)/);
        if (!m) return null;
        const p = m[1].split(',').map((x) => parseFloat(x));
        const f = (v) => { v /= 255; return v <= 0.03928 ? v / 12.92 : Math.pow((v + 0.055) / 1.055, 2.4); };
        return 0.2126 * f(p[0]) + 0.7152 * f(p[1]) + 0.0722 * f(p[2]);
      };
      const parse = (s) => {
        if (/^#([0-9a-fA-F]{6})$/.test(s)) {
          const c = s.slice(1);
          const f = (i) => { const v = parseInt(c.substr(i, 2), 16) / 255; return v <= 0.03928 ? v / 12.92 : Math.pow((v + 0.055) / 1.055, 2.4); };
          return 0.2126 * f(0) + 0.7152 * f(2) + 0.0722 * f(4);
        }
        return lumH(s);
      };
      let checked = 0;
      /* rgba 解析为 [r,g,b,a]；半透明背景沿父链合成后算对比度 */
      const toRGBA = (s) => {
        const m = (s || '').match(/rgba?\(([^)]+)\)/);
        if (!m) {
          if (/^#([0-9a-fA-F]{6})$/.test(s)) {
            const c = s.slice(1);
            return [parseInt(c.substr(0, 2), 16), parseInt(c.substr(2, 2), 16), parseInt(c.substr(4, 2), 16), 1];
          }
          return null;
        }
        const p = m[1].split(',').map((x) => parseFloat(x));
        return [p[0], p[1], p[2], p.length > 3 ? p[3] : 1];
      };
      const lumOf = (rgb) => {
        const f = (v) => { v /= 255; return v <= 0.03928 ? v / 12.92 : Math.pow((v + 0.055) / 1.055, 2.4); };
        return 0.2126 * f(rgb[0]) + 0.7152 * f(rgb[1]) + 0.0722 * f(rgb[2]);
      };
      const compBg = (el) => {
        let acc = null, p = el, d = 0;
        while (p && d < 8) {
          const rgba = toRGBA(getComputedStyle(p).backgroundColor);
          if (rgba) {
            if (!acc) acc = rgba.slice();
            else {
              const a = rgba[3] + acc[3] * (1 - rgba[3]);
              acc = [
                (rgba[0] * rgba[3] + acc[0] * acc[3] * (1 - rgba[3])) / (a || 1),
                (rgba[1] * rgba[3] + acc[1] * acc[3] * (1 - rgba[3])) / (a || 1),
                (rgba[2] * rgba[3] + acc[2] * acc[3] * (1 - rgba[3])) / (a || 1),
                a
              ];
            }
            if (acc[3] >= 0.999) break;
          }
          p = p.parentElement; d++;
        }
        return acc && acc[3] > 0 ? lumOf(acc) : null;
      };
      for (const el of els) {
        if (checked > 400) break;
        const cs = getComputedStyle(el);
        if (cs.display === 'none' || cs.visibility === 'hidden' || parseFloat(cs.opacity) === 0) continue;
        const rect = el.getBoundingClientRect();
        if (rect.width === 0 && rect.height === 0) continue;
        const txt = (el.textContent || '').trim();
        if (!txt || el.children.length > 0) continue;
        const fgRGBA = toRGBA(cs.color);
        if (!fgRGBA) continue;
        const fg = lumOf(fgRGBA);
        const bg = compBg(el);
        if (bg === null) continue;
        const r = (Math.max(fg, bg) + 0.05) / (Math.min(fg, bg) + 0.05);
        checked++;
        if (r < 3.0) bad.push(el.tagName + '.' + (el.className || '').toString().slice(0, 20) + ' "' + txt.slice(0, 12) + '" ' + r.toFixed(2));
        if (bad.length >= 5) break;
      }
      // 白底残留：暗色下仍有大面积 #fff 背景
      const whites = [];
      for (const el of document.querySelectorAll('body, div, section, main, table, thead')) {
        const bg = getComputedStyle(el).backgroundColor;
        if (/255,\s*255,\s*255/.test(bg)) {
          const r = el.getBoundingClientRect();
          if (r.width > 300 && r.height > 100) whites.push(el.tagName + ' ' + Math.round(r.width) + 'x' + Math.round(r.height));
          if (whites.length >= 3) break;
        }
      }
      return { checked, bad, whites };
    });
    ok(res.bad.length === 0, '3) ' + slug + ' 暗色对比度抽查 ' + res.checked + ' 节点' + (res.bad.length ? ' 不足：' + res.bad.join('；') : ''));
    ok(res.whites.length === 0, '3) ' + slug + ' 无大面积白底残留' + (res.whites.length ? '：' + res.whites.join('；') : ''));
    if (SHOTS) await page.screenshot({ path: 'dark-' + slug + '.png' });
    await page.close();
  }
} finally {
  await browser.close();
}
console.log(fail ? 'DARK VERIFY FAIL (' + fail + ')' : 'DARK VERIFY OK');
process.exit(fail ? 1 : 0);