#!/usr/bin/env node
'use strict';

// 把接口目录和参数库写成「每个接口一行」的紧凑格式。
// 体积比缩进格式小约三分之一，同时每个接口独占一行，git diff 仍然逐接口可读。
// 用脚本改过目录后运行 `npm run catalog:format`。

const fs = require('fs');
const path = require('path');

const CATALOG_DIR = path.resolve(__dirname, '..', 'mcp', 'catalog');
const CATALOG_PATH = path.join(CATALOG_DIR, 'voc-social-endpoints.json');
const PARAMS_DIR = path.join(CATALOG_DIR, 'params');

function readJson(file) {
  const text = fs.readFileSync(file, 'utf8');
  return JSON.parse(text.charCodeAt(0) === 0xFEFF ? text.slice(1) : text);
}

function formatCatalog(catalog) {
  const { endpoints, ...header } = catalog;
  const head = JSON.stringify(header, null, 2).replace(/\n}$/, '');
  const rows = (endpoints || []).map(item => `    ${JSON.stringify(item)}`).join(',\n');
  return `${head},\n  "endpoints": [\n${rows}\n  ]\n}\n`;
}

function formatParams(store) {
  const rows = Object.entries(store).map(([id, params]) => `  ${JSON.stringify(id)}: ${JSON.stringify(params)}`).join(',\n');
  return `{\n${rows}\n}\n`;
}

function writeIfChanged(file, content, original) {
  // 格式化不能改变数据：写入前确认解析结果与原数据完全一致。
  if (JSON.stringify(JSON.parse(content)) !== JSON.stringify(original)) {
    throw new Error(`formatting would change data: ${file}`);
  }
  const before = fs.readFileSync(file, 'utf8');
  if (before === content) return 0;
  fs.writeFileSync(file, content, 'utf8');
  return Buffer.byteLength(before, 'utf8') - Buffer.byteLength(content, 'utf8');
}

let saved = 0;
const catalog = readJson(CATALOG_PATH);
saved += writeIfChanged(CATALOG_PATH, formatCatalog(catalog), catalog);
for (const name of fs.readdirSync(PARAMS_DIR).filter(item => item.endsWith('.json'))) {
  const file = path.join(PARAMS_DIR, name);
  const store = readJson(file);
  saved += writeIfChanged(file, formatParams(store), store);
}
console.log(`catalog formatted, ${Math.round(saved / 1024)}KB smaller`);