/**
 * 设备指纹生成 - 跨平台 (v3.0.4: Win11 兼容)
 * 基于: 主机名 + 用户名 + CPU ID + 磁盘序列号 + 架构
 * 输出 SHA-256 hex (64 字符)
 *
 * v3.0.4: Win11 22H2+ 默认移除 wmic.exe, 改为三级 fallback:
 *   1. PowerShell CIM cmdlet (Win10/Win11 通用)
 *   2. wmic.exe (老 Win10 残留)
 *   3. 注册表 MachineGuid (任何 Windows 都有, 兜底)
 */
const crypto = require("crypto");
const os = require("os");
const fs = require("fs");
const { execSync } = require("child_process");

function safeExec(cmd) {
  try {
    return execSync(cmd, { encoding: "utf8", timeout: 5000, windowsHide: true }).toString();
  } catch { return ""; }
}

// Windows 三级 fallback 查询
function winQuery(cimExpr, wmicArgs, regFallback) {
  // 1. PowerShell CIM (最优先 - Win10/11 都原生支持)
  const ps = safeExec(`powershell -NoProfile -NonInteractive -Command "${cimExpr.replace(/"/g, '\\"')}"`);
  const psResult = ps.replace(/[\r\n]/g, "").trim();
  if (psResult && psResult.length > 0) return psResult;

  // 2. wmic.exe fallback (Win11 22H2+ 可能被移除, 先检测存在性)
  const wmic = "C:\\Windows\\System32\\wbem\\wmic.exe";
  if (fs.existsSync(wmic)) {
    const out = safeExec(`"${wmic}" ${wmicArgs}`);
    const lines = out.split(/\r?\n/).filter(l => /=.+/.test(l));
    for (const l of lines) {
      const v = l.split("=")[1]?.trim();
      if (v && v.length > 0) return v;
    }
  }

  // 3. 注册表兜底 (MachineGuid — 任何 Windows 一装系统就存在, 重装才变)
  if (regFallback) {
    const regOut = safeExec(`reg query "${regFallback.key}" /v "${regFallback.value}"`);
    const m = regOut.match(/REG_SZ\s+(.+)/i);
    if (m) return m[1].trim();
  }
  return "";
}

function cpuId() {
  if (process.platform === "win32") {
    return winQuery(
      "(Get-CimInstance Win32_Processor).ProcessorId",
      "cpu get ProcessorId /value",
      { key: "HKLM\\SOFTWARE\\Microsoft\\Cryptography", value: "MachineGuid" }
    );
  }
  if (process.platform === "darwin") {
    const out = safeExec("system_profiler SPHardwareDataType");
    const m = out.match(/Hardware UUID:\s+([A-F0-9-]+)/);
    return m ? m[1] : "";
  }
  // Linux
  return safeExec("cat /etc/machine-id 2>/dev/null").trim();
}

function diskSerial() {
  if (process.platform === "win32") {
    return winQuery(
      "(Get-CimInstance Win32_DiskDrive | Where-Object { $_.SerialNumber } | Select-Object -First 1).SerialNumber",
      "diskdrive get SerialNumber /value",
      { key: "HKLM\\SOFTWARE\\Microsoft\\Cryptography", value: "MachineGuid" }
    );
  }
  if (process.platform === "darwin") {
    const out = safeExec("diskutil info /");
    const m = out.match(/Volume UUID:\s+([A-F0-9-]+)/);
    return m ? m[1] : "";
  }
  return safeExec("lsblk -no SERIAL 2>/dev/null | head -1").trim();
}

function fingerprint() {
  const raw = [
    os.hostname(),
    os.userInfo().username,
    cpuId(),
    diskSerial(),
    os.arch()
  ].join("::");
  return crypto.createHash("sha256").update(raw).digest("hex");
}

module.exports = { fingerprint };

if (require.main === module) {
  // 直接运行时打印指纹
  console.log(fingerprint());
}