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

/**
 * 解析微信开发者工具 CLI 路径。
 *
 * <p>优先级：
 * <ol>
 *   <li>环境变量 {@code WECHAT_DEVTOOLS_CLI}</li>
 *   <li>macOS 默认安装路径</li>
 *   <li>Windows 默认安装路径</li>
 * </ol>
 * 解析不到时返回 {@code null}，由调用方决定是抛出错误还是降级处理。</p>
 */
function resolveWechatDevtoolsCli() {
  const envPath = process.env.WECHAT_DEVTOOLS_CLI;
  if (envPath && fs.existsSync(envPath)) {
    return envPath;
  }

  const platform = os.platform();
  const candidates = [];

  if (platform === 'darwin') {
    candidates.push('/Applications/wechatwebdevtools.app/Contents/MacOS/cli');
    candidates.push('/Applications/微信开发者工具.app/Contents/MacOS/cli');
  } else if (platform === 'win32') {
    candidates.push('C:\\Program Files (x86)\\Tencent\\微信web开发者工具\\cli.bat');
    candidates.push('C:\\Program Files\\Tencent\\微信web开发者工具\\cli.bat');
    candidates.push('D:\\wechat-dev-tools\\cli.bat');
  }

  for (const candidate of candidates) {
    if (fs.existsSync(candidate)) {
      return candidate;
    }
  }

  return null;
}

module.exports = {
  resolveWechatDevtoolsCli,
};