#!/usr/bin/env node
/**
 * scripts/config.mjs —— 部署前缀的**唯一来源**，并把同一份配置写进三个地方。
 *
 * 三处同源（pitfalls.md 第五条 / routing-best-practices.md 坑 4）：
 *   1. <base href>             ← index.html
 *   2. importmap 里的前缀      ← index.html（依赖 + 业务路径都在前缀下）
 *   3. OBS / vendor 上传前缀   ← deploy.sh 读同一个 prefix 文件
 *
 * 做法：先写 deploy/prefix/<env>.txt，再写 index.html。所有副本都由 prefix 派生，
 * 不存在「手工改了其中一处」的可能。check.mjs 会反向校验三者一致。
 *
 * 用法：node scripts/config.mjs <env> [--base <url>]
 *   node scripts/config.mjs local         # http://localhost:<port>/  (由 serve.mjs 读取)
 *   node scripts/config.mjs dev           # /kangshifu/dev/   → https://kangshifu.fmode.cn/kangshifu/dev/
 *   node scripts/config.mjs prod          # /kangshifu/       → https://kangshifu.fmode.cn/kangshifu/
 *   node scripts/config.mjs --prefix /a/b/          # 自定义前缀（必须以 / 开头、/ 结尾）
 *
 * 前缀可以是**完整 URL**（如 https://cdn.example.com/x/env/proj/）：这时所有模块都以绝对 URL 加载，
 * 与页面所在的位置无关 —— 本地用 http.server 按同一目录结构起服务，就能验证「子路径部署」而不改任何源码。
 */
import { writeFileSync, mkdirSync, readFileSync } from 'node:fs';
import { join, dirname } from 'node:path';
import { fileURLToPath } from 'node:url';

export const ROOT = join(dirname(fileURLToPath(import.meta.url)), '..');
const PREFIX_DIR = join(ROOT, 'deploy/prefix');

/** 环境 → 部署前缀。改部署位置只改这里。 */
export const ENVS = {
  local: '/',
  // 本地验证「子路径部署」用：同一套静态文件挂在二级路径下
  'local-sub': '/kangshifu/dev/inno-board/',
  dev: '/kangshifu/dev/',
  prod: '/kangshifu/',
};

export function normalizePrefix(p) {
  if (!p) throw new Error('prefix 不能为空（根部署用 "/"）');
  const s = String(p);
  if (/^https?:\/\//.test(s)) return s.endsWith('/') ? s : s + '/';
  if (!s.startsWith('/')) throw new Error(`prefix 必须以 / 开头：${s}`);
  return s.endsWith('/') ? s : s + '/';
}

/** 在 `<base>` 之后按前缀生成 importmap 原文。依赖与业务都挂在前缀下（同源，无 CORS）。 */
export function importMapJson(prefix) {
  const j = (p) => JSON.stringify(prefix + p);
  return `{
  "imports": {
    "lit": ${j('lib/vendor/lit/v3.3.3/index.js')},
    "lit/": ${j('lib/vendor/lit/v3.3.3/')},
    "lit-html": ${j('lib/vendor/lit-html/v3.3.3/lit-html.js')},
    "lit-html/": ${j('lib/vendor/lit-html/v3.3.3/')},
    "lit-element": ${j('lib/vendor/lit-element/v4.2.2/index.js')},
    "lit-element/": ${j('lib/vendor/lit-element/v4.2.2/')},
    "@lit/reactive-element": ${j('lib/vendor/@lit/reactive-element/v2.1.2/reactive-element.js')},
    "@lit/reactive-element/": ${j('lib/vendor/@lit/reactive-element/v2.1.2/')},
    "@lit/context": ${j('lib/vendor/@lit/context/v1.1.6/index.js')},
    "@lit/context/": ${j('lib/vendor/@lit/context/v1.1.6/')},
    "@lit-labs/signals": ${j('lib/vendor/@lit-labs/signals/v0.3.0/index.js')},
    "@lit-labs/signals/": ${j('lib/vendor/@lit-labs/signals/v0.3.0/')},
    "signal-polyfill": ${j('lib/vendor/signal-polyfill/v0.2.2/dist/index.js')},
    "signal-polyfill/": ${j('lib/vendor/signal-polyfill/v0.2.2/dist/')}
  }
}`;
}

/** index.html 原文：base href、importmap、模块入口全部由 prefix 派生。 */
export function indexHtml(prefix, { dev = false } = {}) {
  return `<!doctype html>
<html lang="zh-CN">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover" />
<meta name="color-scheme" content="light" />
<meta name="theme-color" content="#e9edf7" />
<title>康师傅 · 产品创新看板</title>
<meta name="description" content="康师傅研发中心 AI 赋能实战营 · 多人工作台 + 机会卡片池" />
<!-- 部署前缀唯一来源：scripts/config.mjs（与 importmap 前缀、上传前缀同源） -->
<base href="${prefix}" />
<link rel="preload" href="${prefix}src/assets/inter-latin.woff2" as="font" type="font/woff2" crossorigin />
<script type="importmap">
${importMapJson(prefix)}
</script>
<script>${dev ? 'window.__KF_DEV__=true;window.__KF_PARSE_BASE__="https://kangshifu.fmode.cn/parse";' : ''}</script>
<script type="module" src="${prefix}src/app.js"></script>
</head>
<body>
<kf-app></kf-app>
<noscript><p style="padding:24px;font:16px system-ui">这个看板需要 JavaScript 才能读取数据。请在浏览器中启用 JavaScript 后刷新。</p></noscript>
</body>
</html>
`;
}

/** 写出 index.html + 前缀文件，并自检三处同源。部署脚本与 verify 共用这一个入口。 */
export function writeConfig({ env = 'local', prefix: override = null } = {}) {
  let prefix;
  if (override) {
    prefix = normalizePrefix(override);
    env = env || 'custom';
  } else {
    env = env || 'local';
    if (!ENVS[env]) throw new Error(`未知环境 ${env}；可选：${Object.keys(ENVS).join(' / ')}，或 --prefix <路径>`);
    prefix = ENVS[env];
  }
  const dev = env === 'local' || env === 'local-sub';
  writeFileSync(join(ROOT, 'index.html'), indexHtml(prefix, { dev }));
  mkdirSync(PREFIX_DIR, { recursive: true });
  writeFileSync(join(PREFIX_DIR, `${env}.txt`), prefix + '\n');

  // 自检：写完后反向读取，三处必须同源
  const html = readFileSync(join(ROOT, 'index.html'), 'utf8');
  const base = html.match(/<base href="([^"]+)"/)?.[1];
  const map = JSON.parse(html.match(/<script type="importmap">([\s\S]*?)<\/script>/)[1]);
  const stored = readFileSync(join(PREFIX_DIR, `${env}.txt`), 'utf8').trim();
  const ok = base === prefix && stored === prefix &&
    Object.values(map.imports).every((v) => v.startsWith(prefix)) &&
    html.includes(`src="${prefix}src/app.js"`);
  if (!ok) throw new Error(`三处不同源：base=${base} stored=${stored} prefix=${prefix}`);
  return { env, prefix, base, stored, importCount: Object.keys(map.imports).length };
}

function main() {
  const args = process.argv.slice(2);
  const envArg = args.find((a) => !a.startsWith('--'));
  const override = args.includes('--prefix') ? args[args.indexOf('--prefix') + 1] : null;
  const { env, prefix, base, stored, importCount } = writeConfig({ env: envArg, prefix: override });
  const firstImport = JSON.parse(readFileSync(join(ROOT, 'index.html'), 'utf8')
    .match(/<script type="importmap">([\s\S]*?)<\/script>/)[1]).imports.lit;
  console.log(`✓ env=${env} prefix=${prefix}`);
  console.log(`  base href      = ${base}`);
  console.log(`  importmap 前缀 = ${firstImport.replace(/lib\/vendor.*$/, '')}（${importCount} 条映射）`);
  console.log(`  deploy/prefix/${env}.txt = ${stored}`);
}

if (process.argv[1] && fileURLToPath(import.meta.url) === process.argv[1]) main();