const ffi = require('ffi-napi');
const ref = require('ref-napi');
const path = require('path');
const os = require('os');

// 获取XNCore环境变量
const xnCorePath = process.env.XNCore || '';

// 根据操作系统类型确定动态库扩展名和路径
const isWindows = os.platform() === 'win32';
const libExtension = isWindows ? '.dll' : '.so';
const libPrefix = isWindows ? '' : 'lib';
const libName = `${libPrefix}Login${libExtension}`;
const libPath = path.join(xnCorePath, 'lib', libName);

// 定义Buffer类型
const BufferType = ref.refType(ref.types.void);
const StringType = ref.types.CString;

// 定义动态库函数接口
let loginLib;
try {
  loginLib = ffi.Library(libPath, {
    'validateUser': ['int', [BufferType, 'size_t', BufferType, 'size_t']],
    'getUserInfo': [StringType, ['int']],
    'cleanup': ['void', []],
    'registerUser': ['int', [BufferType, 'size_t', BufferType, 'size_t', BufferType, 'size_t']]
  });
} catch (error) {
  console.error(`加载 ${libName} 失败:`, error);
}

// 注册进程退出时的清理函数
function performCleanup() {
  console.log('正在执行清理操作...');
  if (loginLib) {
    try {
      loginLib.cleanup();
      console.log('清理操作完成');
    } catch (error) {
      console.error('清理操作失败:', error);
    }
  }
}

// 转换字符串为Buffer的函数
function stringToBuffer(str) {
  try {
    if (!str) {
      return { buffer: Buffer.alloc(0), length: 0 };
    }
    const buffer = Buffer.from(str, 'utf8');
    return { buffer: buffer, length: buffer.length };
  } catch (error) {
    console.error('字符串转Buffer失败:', error);
    return { buffer: Buffer.alloc(0), length: 0 };
  }
}

module.exports = {
  loginLib,
  performCleanup,
  stringToBuffer
};