#!/usr/bin/env node
/** 汇总 parts-r/00..13 为《ClassHelper灵动岛重构-给ChatGPT的完整提示词.md》 */
import { readdirSync, readFileSync, writeFileSync, mkdirSync, copyFileSync } from 'node:fs';
import { join, dirname } from 'node:path';
import { fileURLToPath } from 'node:url';

const root = join(dirname(fileURLToPath(import.meta.url)), '..');
const partsDir = join(root, 'parts-r');
const outFile = join(root, 'ClassHelper灵动岛重构-给ChatGPT的完整提示词.md');

const files = readdirSync(partsDir)
  .filter((f) => /^\d{2}-.+\.md$/.test(f))
  .sort((a, b) => a.localeCompare(b, 'en'));

if (files.length !== 14) console.warn(`警告：parts-r 文件数 ${files.length}，预期 14`);
if (!files.some((f) => f.startsWith('00-'))) throw new Error('缺少 parts-r/00-preamble.md');

const sections = [];
const toc = [];
const stats = [];
let preamble = '';
for (const file of files) {
  const content = readFileSync(join(partsDir, file), 'utf8').replace(/\r\n/g, '\n').trimEnd();
  if (file.startsWith('00-')) {
    preamble = content;
    for (const line of content.split('\n')) if (/^## /.test(line)) toc.push(`- ${line.replace(/^##\s+/, '').trim()}`);
    continue;
  }
  for (const line of content.split('\n')) {
    if (/^## /.test(line)) toc.push(`- ${line.replace(/^##\s+/, '').trim()}`);
    else if (/^### /.test(line)) toc.push(`  - ${line.replace(/^###\s+/, '').trim()}`);
  }
  const chars = [...content.replace(/\s/g, '')].length;
  const cjk = (content.match(/[\u4e00-\u9fff]/g) || []).length;
  stats.push({ file, chars, cjk, lines: content.split('\n').length });
  sections.push(content);
}
if (!preamble.includes('<!-- TOC -->')) throw new Error('preamble 缺少 TOC 占位符');
const tocBlock = ['## 目录', '', ...toc, ''].join('\n');
const body = [preamble.replace('<!-- TOC -->', tocBlock), ...sections].join('\n\n---\n\n');
writeFileSync(outFile, body + '\n', 'utf8');

const totalChars = [...body.replace(/\s/g, '')].length;
const totalCjk = (body.match(/[\u4e00-\u9fff]/g) || []).length;
console.log(`输出：${outFile}`);
console.log(`去空白字符：${totalChars}；汉字：${totalCjk}；行数：${body.split('\n').length}`);
console.log(`粗略 token：${Math.round(totalCjk * 0.9 + (totalChars - totalCjk) * 0.3)}`);
for (const s of stats) console.log(`  ${s.file.padEnd(26)} ${String(s.chars).padStart(7)} 字符  ${String(s.cjk).padStart(6)} 汉字`);
console.log(`  00-preamble.md             ${String([...preamble.replace(/\s/g, '')].length).padStart(7)} 字符  ${String((preamble.match(/[\u4e00-\u9fff]/g) || []).length).padStart(6)} 汉字`);

if (process.argv.includes('--split')) {
  const outDir = join(root, 'out');
  const sectionsDir = join(outDir, 'refactor-sections');
  mkdirSync(sectionsDir, { recursive: true });
  const volumes = [
    { name: 'vol1-任务声明与现状基线（00-02）', nums: [0, 1, 2] },
    { name: 'vol2-基准语义与文件数据改造（03-05）', nums: [3, 4, 5] },
    { name: 'vol3-tokens与组件规格（06-07）', nums: [6, 7] },
    { name: 'vol4-消息课程与编辑器（08-09）', nums: [8, 9] },
    { name: 'vol5-动画兼容与验收里程碑（10-13）', nums: [10, 11, 12, 13] },
  ];
  for (const v of volumes) {
    const chunks = [];
    if (v.nums.includes(0)) chunks.push(preamble.replace('<!-- TOC -->', tocBlock));
    for (const n of v.nums) {
      if (n === 0) continue;
      const f = files.find((x) => Number(x.slice(0, 2)) === n);
      if (f) chunks.push(readFileSync(join(partsDir, f), 'utf8').replace(/\r\n/g, '\n').trimEnd());
      else console.warn(`警告：缺少 part ${n}`);
    }
    const p = join(outDir, `${v.name}.md`);
    writeFileSync(p, chunks.join('\n\n---\n\n') + '\n', 'utf8');
    const c = readFileSync(p, 'utf8');
    console.log(`分卷：${p}（${[...c.replace(/\s/g, '')].length} 字符）`);
  }
  for (const f of files) copyFileSync(join(partsDir, f), join(sectionsDir, f));
  console.log(`逐节文件：${sectionsDir}（${files.length} 个）`);
}