/**
 * 验证「多模态附件」这条链路（`/api/chat` 的 `pictures` / `files` 两个字段）。
 *
 * 历史：2026-09-18 时新接口只收 `{thread_id, question}`，多一个字段 422，
 * 附件只能**把 OSS 地址拼进 question 文本**（方案②）。
 * 2026-09-23 后端支持了 `pictures` / `files`（方案①），改为走请求体字段。
 *
 * **实测到的契约**（2026-09-23，打真实后端）：
 *   - 两者都是 **URL 字符串数组**；传对象数组（`[{url,name}]`）会被 `422 invalid_request` 拒掉
 *   - `pictures` 里的图**由后端自己去取**（必须公网可达）——
 *     实测带上 `pictures:[图URL]` 问「这张图片里是什么」，模型确实描述了图的内容
 *   - 空数组与不传都接受
 *
 * 不变量：
 *   ① **没有附件时请求体逐字节与从前一致**（只有 thread_id + question）——
 *      既不多传无意义字段，也让「后端若回滚」只影响带附件的轮次
 *   ② 有附件时：`question` 仍是**用户原文**（地址不拼进去），附件在 `pictures` / `files` 里
 *   ③ 图片按 `isImage` 进 `pictures`，其余进 `files`；空 URL 被过滤掉
 *
 * 怎么跑（在项目根目录）：
 *   npx esbuild harness/tools/_entry-attachments.ts --bundle --format=esm \
 *     --outfile=harness/tools/_attachments.mjs --alias:@=./src \
 *     --define:import.meta.env='{}' --loader:.png=dataurl
 *     # ⚠️ 必须带 --loader:.png=dataurl：协调器 import 了企业微信二维码
 *   node harness/tools/verify-attachment-question.mjs
 */

import { readFileSync, readdirSync } from 'node:fs';

const { toChatAttachmentUrls, ApiChatCoordinator } = await import('./_attachments.mjs');

let pass = 0;
let fail = 0;
const check = (name, cond, extra = '') => {
  if (cond) {
    pass++;
    console.log('  ok   ' + name);
  } else {
    fail++;
    console.log('  FAIL ' + name + '  ' + extra);
  }
};

const IMG1 = 'https://bucket.oss-cn-shanghai.aliyuncs.com/upload/a.png';
const IMG2 = 'https://bucket.oss-cn-shanghai.aliyuncs.com/upload/b.jpg';
const PDF = 'https://bucket.oss-cn-shanghai.aliyuncs.com/upload/c.pdf';
const DOC = 'https://bucket.oss-cn-shanghai.aliyuncs.com/upload/d.docx';

const att = (url, isImage) => ({ id: url, name: url.split('/').pop(), size: 1, isImage, url });
const tx = (attachments, files) => ({
  files: files ?? attachments.map((a) => a.url),
  file_pos: attachments.map(() => 0),
  attachments,
});

console.log('\n【1】按类型拆分（纯逻辑）');
{
  const mixed = toChatAttachmentUrls(tx([att(IMG1, true), att(PDF, false), att(IMG2, true)]));
  check('图片进 pictures', JSON.stringify(mixed.pictures) === JSON.stringify([IMG1, IMG2]), JSON.stringify(mixed.pictures));
  check('非图片进 files', JSON.stringify(mixed.files) === JSON.stringify([PDF]), JSON.stringify(mixed.files));

  const onlyImages = toChatAttachmentUrls(tx([att(IMG1, true)]));
  check('只有图片时 files 为空数组', onlyImages.files.length === 0 && onlyImages.pictures.length === 1);

  const none = toChatAttachmentUrls(undefined);
  check('没有附件 → 两个空数组', none.pictures.length === 0 && none.files.length === 0);
  check('null 也安全', JSON.stringify(toChatAttachmentUrls(null)) === JSON.stringify({ pictures: [], files: [] }));
  check('空 attachments 数组 → 两个空数组', JSON.stringify(toChatAttachmentUrls(tx([]))) === JSON.stringify({ pictures: [], files: [] }));

  const dirty = toChatAttachmentUrls(tx([att('  ' + IMG1 + '  ', true), att('', false)]));
  check('URL 前后空格去掉、空 URL 过滤掉', JSON.stringify(dirty.pictures) === JSON.stringify([IMG1]) && dirty.files.length === 0, JSON.stringify(dirty));

  const noAttachments = toChatAttachmentUrls({ files: [PDF, DOC], file_pos: [0, 0] });
  check('只有 files（没 attachments）→ 全落 files，地址不丢', JSON.stringify(noAttachments.files) === JSON.stringify([PDF, DOC]), JSON.stringify(noAttachments));
}

/* ------------------------------------------------------------------ *
 * 协调器：真正发出的请求体
 * ------------------------------------------------------------------ */
const sse = (events) =>
  events
    .map(([event, data]) => `event: ${event}\ndata: ${JSON.stringify({ thread_id: 't1', request_id: 'r1', data })}\n\n`)
    .join('');

let captured = [];
const stubFetch = () => {
  globalThis.fetch = async (url, init = {}) => {
    captured.push(init.body ? JSON.parse(String(init.body)) : null);
    return new Response(
      new ReadableStream({
        start(controller) {
          controller.enqueue(new TextEncoder().encode(sse([['done', { status: 'completed' }]])));
          controller.close();
        },
      }),
      { status: 200, headers: { 'Content-Type': 'text/event-stream' } }
    );
  };
};

const runTurn = async (question, attachments) => {
  captured = [];
  stubFetch();
  const coordinator = new ApiChatCoordinator({ baseUrl: 'http://stub', threadId: 't1' });
  await coordinator.generateAnswer(question, attachments);
  await new Promise((r) => setTimeout(r, 60));
  return captured[0];
};

console.log('\n【2】请求体：没有附件时与从前逐字节一致');
{
  const body = await runTurn('帮我看看这份材料符合条件吗');
  check(
    '只有 thread_id + question',
    JSON.stringify(Object.keys(body).sort()) === JSON.stringify(['question', 'thread_id']),
    JSON.stringify(body)
  );
  check('不该出现空数组字段', !('pictures' in body) && !('files' in body), JSON.stringify(body));

  const empty = await runTurn('没有附件', { pictures: [], files: [] });
  check('显式传空数组也不发字段', !('pictures' in empty) && !('files' in empty), JSON.stringify(empty));
}

console.log('\n【3】请求体：带附件时');
{
  const Q = '帮我看看这份材料符合条件吗';
  const body = await runTurn(Q, { pictures: [IMG1], files: [PDF] });
  check('**question 是用户原文**（地址不拼进去）', body.question === Q, JSON.stringify(body.question));
  check('pictures 是 URL 字符串数组', JSON.stringify(body.pictures) === JSON.stringify([IMG1]), JSON.stringify(body.pictures));
  check('files 是 URL 字符串数组', JSON.stringify(body.files) === JSON.stringify([PDF]), JSON.stringify(body.files));
  check('没有多余字段', JSON.stringify(Object.keys(body).sort()) === JSON.stringify(['files', 'pictures', 'question', 'thread_id']), JSON.stringify(Object.keys(body)));
  check(
    'pictures 里**不带**对象结构（后端只认字符串数组，传对象 422）',
    body.pictures.every((item) => typeof item === 'string'),
    JSON.stringify(body.pictures)
  );

  const multi = await runTurn(Q, { pictures: [IMG1, IMG2], files: [PDF, DOC] });
  check('支持多个图片与文件', multi.pictures.length === 2 && multi.files.length === 2, JSON.stringify(multi));

  const dirty = await runTurn(Q, { pictures: ['', '  '], files: [PDF] });
  check('空 URL 被清掉（不会发出 [""]）', !('pictures' in dirty) && JSON.stringify(dirty.files) === JSON.stringify([PDF]), JSON.stringify(dirty));
}

console.log('\n【4】旧方案已停用（源码级）');
{
  const files = [];
  const walk = (dir) => {
    for (const entry of readdirSync(dir, { withFileTypes: true })) {
      const full = `${dir}/${entry.name}`;
      if (entry.isDirectory()) walk(full);
      else if (/\.(ts|vue)$/.test(entry.name)) files.push(full);
    }
  };
  walk('src');

  const callers = files.filter((file) => {
    const text = readFileSync(file, 'utf8');
    // 跳过它自己的定义（已在 shared.ts 里注释掉）
    return text.split('\n').some((line) => !line.trim().startsWith('//') && line.includes('buildQuestionWithAttachments'));
  });
  check('没有活跃调用点（地址不再拼进 question）', callers.length === 0, callers.join(', '));
}

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