/**
 * 验证「复制」在 **HTTP（非安全上下文）** 下仍可用。
 *
 * 为什么要有它：`navigator.clipboard` **只在安全上下文存在**（HTTPS / localhost）。
 * 用户 2026-09-29 要部署到 HTTP ⇒ 原来的写法
 *   `navigator.clipboard.writeText(x).catch(() => { …execCommand 兜底… })`
 * 会在取 `.writeText` 时**同步抛 TypeError**，`.catch()` 根本轮不到 ⇒ 复制按钮直接报错。
 * 现在改成「显式判断 + try/catch + execCommand 兜底」。
 *
 * 怎么跑（纯 node，不需要打包）：
 *   node harness/tools/verify-clipboard-fallback.mjs
 *
 * 做法：从 `FeedbackWidget.vue` 里**抽出真实的 `writeClipboard` 源码**（用 esbuild 去掉 TS 类型），
 * 配三组桩跑：① HTTP（没有 clipboard）② 正常 HTTPS ③ clipboard 存在但 reject。
 */

import { readFileSync } from 'node:fs';
import { transform } from 'esbuild';

let pass = 0;
let fail = 0;
const check = (label, ok, extra = '') => {
  if (ok) {
    pass += 1;
    console.log(`  ok   ${label}${extra ? ` —— ${extra}` : ''}`);
  } else {
    fail += 1;
    console.log(`  FAIL ${label}${extra ? ` —— ${extra}` : ''}`);
  }
};

const vue = readFileSync('src/components/Common/FeedbackWidget.vue', 'utf8');
const start = vue.indexOf('async function writeClipboard');
if (start === -1) {
  console.error('❌ 没在 FeedbackWidget.vue 里找到 writeClipboard()');
  process.exit(1);
}
// 花括号配平取出整个函数体（跳过字符串/模板里的花括号；这个函数很简单，够用）
let depth = 0;
let end = -1;
for (let i = vue.indexOf('{', start); i < vue.length; i += 1) {
  const ch = vue[i];
  if (ch === '{') depth += 1;
  else if (ch === '}') {
    depth -= 1;
    if (depth === 0) { end = i + 1; break; }
  }
}
const tsSource = vue.slice(start, end);
check('从 SFC 里抽到了 writeClipboard 源码', tsSource.includes('execCommand'), `长度 ${tsSource.length}`);

const jsSource = (await transform(tsSource, { loader: 'ts', format: 'esm' })).code;

/** 造一组最小的 document 桩，记录 execCommand 是否被调用 */
const makeDocument = () => {
  const calls = { execCommand: 0, appended: 0, removed: 0 };
  const el = { value: '', style: {}, select: () => {}, };
  const doc = {
    createElement: () => el,
    body: {
      appendChild: () => { calls.appended += 1; },
      removeChild: () => { calls.removed += 1; },
    },
    execCommand: (cmd) => { calls.execCommand += 1; return cmd === 'copy'; },
  };
  return { doc, calls };
};

const run = async (navigatorStub) => {
  const { doc, calls } = makeDocument();
  const factory = new Function('navigator', 'document', `${jsSource}\nreturn writeClipboard;`);
  const fn = factory(navigatorStub, doc);
  let threw = null;
  try { await fn('待复制的内容'); } catch (e) { threw = e; }
  return { calls, threw };
};

console.log('\n【1】HTTP（非安全上下文）：navigator.clipboard 不存在 → 必须走 execCommand 兜底且不抛错');
{
  const { calls, threw } = await run({});
  check('没有抛错', threw === null, threw ? String(threw).slice(0, 60) : '');
  check('走了 execCommand 兜底', calls.execCommand === 1, `execCommand 调用 ${calls.execCommand} 次`);
  check('临时 textarea 加了又移除（不漏在 DOM 里）', calls.appended === 1 && calls.removed === 1,
    `append ${calls.appended} / remove ${calls.removed}`);
}

console.log('\n【2】HTTPS（安全上下文）：clipboard.writeText 可用 → 用它，不碰 execCommand');
{
  let written = '';
  const { calls, threw } = await run({ clipboard: { writeText: async (t) => { written = t; } } });
  check('没有抛错', threw === null);
  check('用了 clipboard.writeText', written === '待复制的内容');
  check('没有走 execCommand', calls.execCommand === 0);
}

console.log('\n【3】clipboard 存在但抛错（如权限被拒）→ 回退到 execCommand');
{
  const { calls, threw } = await run({
    clipboard: { writeText: () => { throw new Error('NotAllowedError'); } },
  });
  check('没有抛错（同步抛错也被接住）', threw === null, threw ? String(threw).slice(0, 60) : '');
  check('回退到 execCommand', calls.execCommand === 1);
}

console.log(`\n===== 通过 ${pass} 项，失败 ${fail} 项 =====`);
process.exit(fail ? 1 : 0);