#!/usr/bin/env node
/**
 * build-dist.mjs — 产出可分发产物（npm 包 / CDN）
 *
 * 设计约束：
 *  - 零运行时依赖：只用 Node 内置能力（fs / path）
 *  - 不依赖 build-site.ps1（那是 Windows 专用的文档站构建）
 *  - 产物自包含：dist/ 里的东西拷走就能用
 *
 * 输入：
 *  - .design_library/aurora-admin/colors_and_type.css   设计令牌
 *  - .design_library/aurora-admin/components.css        6 核心组件样式聚合
 *  - .design_library/aurora-admin/css.json              结构化令牌
 *  - frameworks/*.css                                   79 个组件样式
 *  - frameworks/*.html                                  79 个演示页
 *
 * 输出：
 *  - dist/tokens/tokens.css         设计令牌（可直接 @import）
 *  - dist/tokens/tokens.json        W3C DTCG 格式
 *  - dist/tokens/figma.json         Figma Tokens 格式
 *  - dist/components/<slug>.css     单个组件样式
 *  - dist/components/index.css      全部组件样式聚合
 *  - dist/components/<slug>.html    静态演示页（可独立打开）
 *  - dist/manifest.json             组件清单 + 版本 + 校验和
 *  - dist/README.md                 用法速查
 */
import { readFileSync, writeFileSync, mkdirSync, existsSync, readdirSync, statSync } from 'fs';
import { createHash } from 'crypto';
import { join, dirname } from 'path';
import { fileURLToPath } from 'url';

const __dirname = dirname(fileURLToPath(import.meta.url));
const ROOT = join(__dirname, '..');
const LIB = join(ROOT, '.design_library', 'aurora-admin');
const SRC = join(ROOT, 'frameworks');
const DIST = join(ROOT, 'dist');

/* ---------- 工具 ---------- */

function ensure(dir) {
  if (!existsSync(dir)) mkdirSync(dir, { recursive: true });
}

function read(p) {
  return readFileSync(p, 'utf8');
}

function write(p, content) {
  ensure(dirname(p));
  // 统一 LF，避免跨平台差异
  writeFileSync(p, content.replace(/\r\n/g, '\n'));
}

function sha256(content) {
  return createHash('sha256').update(content).digest('hex').slice(0, 16);
}

/* ---------- 1. 读组件清单 ---------- */

const idxPath = join(LIB, 'components', 'index.json');
if (!existsSync(idxPath)) {
  console.error('[FATAL] 找不到 components/index.json');
  process.exit(1);
}
const idx = JSON.parse(read(idxPath));
const components = idx.components;

const pkg = JSON.parse(read(join(ROOT, 'package.json')));
const version = pkg.version;

console.log(`[build-dist] 版本 ${version} / ${components.length} 个组件`);

/* ---------- 2. 令牌 ---------- */

const tokenCss = read(join(LIB, 'colors_and_type.css'));

// 从令牌文件解析出 name/value/comment（与 build-site.ps1 同一套正则思路）
const tokens = [];
const TOKEN_RE = /--(au-[a-z0-9-]+)\s*:\s*([^;]+);(?:\s*\/\*\s*(.*?)\s*\*\/)?/g;
let m;
while ((m = TOKEN_RE.exec(tokenCss)) !== null) {
  tokens.push({ name: m[1], value: m[2].trim(), comment: (m[3] || '').trim() });
}

write(join(DIST, 'tokens', 'tokens.css'), tokenCss);

// W3C DTCG
function groupOf(name) {
  if (/color|brand|text|bg|border|success|warning|error|info|mask/.test(name)) return 'color';
  if (/font|type/.test(name)) return 'typography';
  if (/radius/.test(name)) return 'radius';
  if (/space|gap|padding/.test(name)) return 'spacing';
  if (/shadow|elevation/.test(name)) return 'shadow';
  if (/duration|ease|motion/.test(name)) return 'motion';
  if (/size|height|width|icon/.test(name)) return 'size';
  return 'misc';
}
const dtcg = {};
for (const t of tokens) {
  const g = groupOf(t.name);
  dtcg[g] = dtcg[g] || {};
  dtcg[g][t.name] = { $value: t.value, $type: g === 'color' ? 'color' : 'dimension', $description: t.comment || undefined };
}
write(
  join(DIST, 'tokens', 'tokens.json'),
  JSON.stringify(
    { $schema: 'https://schemas.design-tokens.org/draft/dtcg.json', $metadata: { name: 'Aurora Admin', version }, tokens: dtcg },
    null,
    2
  )
);

// Figma Tokens
const figma = {};
for (const t of tokens) {
  const g = groupOf(t.name);
  figma[t.name] = {
    value: t.value,
    type: g === 'color' ? 'color' : g === 'size' ? 'sizing' : g === 'spacing' ? 'spacing' : g === 'radius' ? 'borderRadius' : 'other',
    description: t.comment || '',
  };
}
write(join(DIST, 'tokens', 'figma.json'), JSON.stringify({ global: figma, $themes: [], $metadata: { tokenSetOrder: ['global'] } }, null, 2));

console.log(`[build-dist] 令牌 ${tokens.length} 个 → dist/tokens/`);

/* ---------- 3. 组件样式 ---------- */

const manifest = {
  name: pkg.name,
  version,
  generated: new Date().toISOString().slice(0, 19).replace('T', ' '),
  tokens: tokens.length,
  components: [],
};

const aggregate = [
  '/* Aurora Admin — 全部组件样式聚合',
  ` * 版本 ${version} · ${components.length} 个组件`,
  ' * 用法：在令牌之后引入本文件即可获得全部组件样式',
  ' */',
  '',
  /* 本文件位于 dist/components/，令牌在 dist/tokens/ —— 故必须是 ../tokens/ */
  `@import url('../tokens/tokens.css');`,
  '',
].join('\n');

const parts = [aggregate];

for (const c of components) {
  const slug = c.slug;
  const prefix = c.frameworksPrefix;

  // 组件 CSS
  const cssPath = join(SRC, `${prefix}.css`);
  if (existsSync(cssPath)) {
    const css = read(cssPath);
    write(join(DIST, 'components', `${slug}.css`), `/* Aurora Admin · ${c.name} */\n${css}`);
    parts.push(`/* ---- ${c.name} (${slug}) ---- */`, css, '');
  }

  // 演示页（重写引用，使其在 dist 下能独立打开）
  const htmlPath = join(SRC, `${prefix}.html`);
  let hasDemo = false;
  if (existsSync(htmlPath)) {
    let html = read(htmlPath);
    /* dist 的目录结构：
         dist/components/<slug>.html
         dist/components/<slug>.css
         dist/tokens/tokens.css
       因此所有引用都要重写。漏掉文件名是最容易犯的错 —— 会产出「路径对但文件不存在」的坏产物。 */
    html = html.replace(/\.\.\/\.design_library\/aurora-admin\/colors_and_type\.css/g, '../tokens/tokens.css');
    html = html.replace(/\.\.\/\.design_library\/aurora-admin\/components\.css/g, './index.css');
    html = html.replace(/\.\.\/\.design_library\/aurora-admin\//g, '../tokens/');
    // 组件自身样式：./<Prefix>.css → ./<slug>.css
    html = html.replace(new RegExp(`(\\./)?${prefix}\\.css`, 'g'), `./${slug}.css`);
    write(join(DIST, 'components', `${slug}.html`), html);
    hasDemo = true;
  }

  manifest.components.push({
    slug,
    name: c.name,
    category: c.category,
    tier: c.tier,
    css: existsSync(cssPath) ? `components/${slug}.css` : null,
    demo: hasDemo ? `components/${slug}.html` : null,
    cssHash: existsSync(cssPath) ? sha256(read(cssPath)) : null,
  });
}

write(join(DIST, 'components', 'index.css'), parts.join('\n'));
write(join(DIST, 'manifest.json'), JSON.stringify(manifest, null, 2));

const cssCount = readdirSync(join(DIST, 'components')).filter((f) => f.endsWith('.css')).length;
const htmlCount = readdirSync(join(DIST, 'components')).filter((f) => f.endsWith('.html')).length;
console.log(`[build-dist] 组件 ${components.length} 个 → dist/components/（${cssCount} css / ${htmlCount} html）`);

/* ---------- 4. 用法速查 ---------- */

write(
  join(DIST, 'README.md'),
  `# Aurora Admin Design System — 分发包

版本 ${version} · ${components.length} 个组件 · ${tokens.length} 个设计令牌 · 零运行时依赖

## 最快用法

\`\`\`html
<link rel="stylesheet" href="./tokens/tokens.css">
<link rel="stylesheet" href="./components/index.css">
\`\`\`

## 按需引入

\`\`\`html
<link rel="stylesheet" href="./tokens/tokens.css">
<link rel="stylesheet" href="./components/button.css">   <!-- 只要按钮 -->
\`\`\`

## 改主题

所有色值都引用 \`--au-*\` 令牌，覆盖即可全局换色：

\`\`\`css
:root { --au-color-brand: #722ED1; }
\`\`\`

## 目录

| 路径 | 内容 |
|---|---|
| \`tokens/tokens.css\` | 设计令牌（CSS 变量） |
| \`tokens/tokens.json\` | 同上（W3C DTCG 格式，供工具消费） |
| \`tokens/figma.json\` | Figma Tokens（Tokens Studio 可导入） |
| \`components/index.css\` | 全部组件样式聚合 |
| \`components/<slug>.css\` | 单个组件样式 |
| \`components/<slug>.html\` | 该组件的静态演示页（可直接打开） |
| \`manifest.json\` | 组件清单 + 校验和 |

## 组件清单

${manifest.components.map((c) => `- \`${c.slug}\` — ${c.name}`).join('\n')}
`
);

console.log('[build-dist] 完成 → dist/');
console.log(`             components/manifest.json · README.md`);