#!/usr/bin/env node
/**
 * MetonaEditor 性能基准 — 解析器吞吐测试
 * 用法: npm run build && npm run bench
 */

const MeEditor = require('../dist/metona-editor.cjs');
const { parseMarkdown } = MeEditor;

const buildSample = (kb) => {
  const chunk = [
    '# 性能基准文档',
    '',
    '这是一个 **粗体** 与 *斜体* 的段落，包含 `inline code` 和 [链接](https://example.com)。',
    '',
    '- 列表项一',
    '- 列表项二',
    '  - 嵌套项',
    '  - 嵌套项二',
    '- 列表项三',
    '',
    '1. 有序一',
    '2. 有序二',
    '',
    '> 引用内容',
    '> 继续引用',
    '',
    '```js',
    'function hello(name) {',
    '  const msg = `Hello, ${name}!`;',
    '  return msg;',
    '}',
    '```',
    '',
    '| 列一 | 列二 | 列三 |',
    '| --- | :---: | ---: |',
    '| A | B | C |',
    '| D | E | F |',
    '',
    '---',
    '',
    '引用链接：[文档][ref]',
    '',
    '[ref]: https://example.com/docs "参考"',
    '',
    '脚注示例[^1]',
    '',
    '[^1]: 脚注内容',
    '',
    '## 二级标题',
    '',
    '$$E = mc^2$$',
    '',
    'H~2~O 与 x^2^，还有 :rocket: emoji。',
    '',
  ].join('\n');
  const repeat = Math.max(1, Math.ceil((kb * 1024) / chunk.length));
  return chunk.repeat(repeat);
};

const median = (arr) => {
  const s = [...arr].sort((a, b) => a - b);
  const mid = Math.floor(s.length / 2);
  return s.length % 2 ? s[mid] : (s[mid - 1] + s[mid]) / 2;
};

const benchmark = (label, fn, iterations = 5) => {
  // warmup
  fn();
  const times = [];
  for (let i = 0; i < iterations; i++) {
    const t0 = process.hrtime.bigint();
    fn();
    const t1 = process.hrtime.bigint();
    times.push(Number(t1 - t0) / 1e6);
  }
  const ms = median(times);
  return { label, ms: ms.toFixed(1), opsPerSec: (1000 / ms).toFixed(1) };
};

console.log('MetonaEditor 性能基准');
console.log('=====================');
console.log(`版本: ${MeEditor.VERSION}`);
console.log('');

for (const size of [64, 256, 1024]) {
  const sample = buildSample(size);
  const r = benchmark(`parseMarkdown ${size}KB (${sample.length.toLocaleString()} chars)`, () => {
    const html = parseMarkdown(sample);
    if (!html) throw new Error('empty output');
  });
  console.log(`  ${r.label}: ${r.ms} ms  (${r.opsPerSec} ops/s)`);
}

console.log('');

// 语法高亮基准
try {
  const code = Array.from({ length: 200 }, (_, i) =>
    `function f${i}(a, b) { const s = "str${i}"; // comment\n  return a + b + ${i}; }`,
  ).join('\n');
  const r = benchmark('highlight 200 functions (js)', () => {
    MeEditor.highlight(code, 'js');
  });
  console.log(`  ${r.label}: ${r.ms} ms  (${r.opsPerSec} ops/s)`);
} catch (_) {
  console.log('  (highlight benchmark skipped)');
}

console.log('');
console.log('完成。');