#!/usr/bin/env node
// CLI 入口: Layer XML → Cocos prefab JSON (+ 对比 diff, 如提供 YouleNexus 现存 prefab).
//
// 用法: node legacy-layer-to-cocos-prefab-cli.mjs <input.xml> [<youle-prefab>] <output-dir>
//
// 设计要点 (Task 9 brief):
//   - 只输出到隔离目录 (out/legacy-migration/), 不直接覆盖 YouleNexus 现有 prefab.
//   - 必填参数: inputXml + outputDir; youlePrefab 可选, 提供且文件存在时生成 .diff.
//   - diff 命令来自 Git Bash / POSIX 环境 (Windows: Git for Windows 自带 diff).
import { readLayerXml, emitPrefabJson } from './legacy-layer-to-cocos-prefab.mjs';
import { writeFileSync, mkdirSync, existsSync } from 'node:fs';
import { execSync } from 'node:child_process';
import { join } from 'node:path';

const [, , inputXml, youlePrefab, outputDir] = process.argv;
if (!inputXml || !outputDir) {
  console.error('Usage: node legacy-layer-to-cocos-prefab-cli.mjs <input.xml> <youle-prefab-path?> <output-dir>');
  process.exit(1);
}

const layer = readLayerXml(inputXml);
const prefabJson = emitPrefabJson(layer);

if (!existsSync(outputDir)) mkdirSync(outputDir, { recursive: true });
const outputPath = join(outputDir, `${layer.layerName}.prefab`);
writeFileSync(outputPath, JSON.stringify(prefabJson, null, 2));
console.log(`Generated: ${outputPath}`);

if (youlePrefab && existsSync(youlePrefab)) {
  const diffPath = `${outputPath}.diff`;
  // `|| true` 确保 diff 找到差异时返回非零退出码不致 CLI 崩溃.
  const diff = execSync(`diff -u "${youlePrefab}" "${outputPath}" || true`, { encoding: 'utf8' });
  writeFileSync(diffPath, diff);
  console.log(`Diff: ${diffPath} (${diff.split('\n').length} lines)`);
}