using System;
using System.Management;
using System.Security.Cryptography;
using System.Text;

namespace WpfApp.Utils
{
    /// <summary>
    /// 硬件信息工具类，用于获取主板和CPU序列号
    /// </summary>
    public static class HardwareInfo
    {
        /// <summary>
        /// 获取主板序列号
        /// </summary>
        /// <returns>主板序列号</returns>
        public static string GetMotherboardSerialNumber()
        {
            try
            {
                using (var searcher = new ManagementObjectSearcher("SELECT SerialNumber FROM Win32_BaseBoard"))
                {
                    foreach (var obj in searcher.Get())
                    {
                        return obj["SerialNumber"].ToString().Trim();
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"获取主板序列号时出错: {ex.Message}");
            }
            return string.Empty;
        }

        /// <summary>
        /// 获取CPU序列号
        /// </summary>
        /// <returns>CPU序列号</returns>
        public static string GetCpuSerialNumber()
        {
            try
            {
                using (var searcher = new ManagementObjectSearcher("SELECT ProcessorId FROM Win32_Processor"))
                {
                    foreach (var obj in searcher.Get())
                    {
                        return obj["ProcessorId"].ToString().Trim();
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"获取CPU序列号时出错: {ex.Message}");
            }
            return string.Empty;
        }

        /// <summary>
        /// 获取硬件标识（主板序列号和CPU序列号的组合哈希值）
        /// </summary>
        /// <returns>硬件标识哈希值</returns>
        public static string GetHardwareId()
        {
            string motherboardSn = GetMotherboardSerialNumber();
            string cpuSn = GetCpuSerialNumber();
            string combined = $"{motherboardSn}|{cpuSn}";
            
            // 计算组合值的SHA256哈希
            using (SHA256 sha256 = SHA256.Create())
            {
                byte[] hashBytes = sha256.ComputeHash(Encoding.UTF8.GetBytes(combined));
                StringBuilder builder = new StringBuilder();
                for (int i = 0; i < hashBytes.Length; i++)
                {
                    builder.Append(hashBytes[i].ToString("x2"));
                }
                return builder.ToString();
            }
        }

        /// <summary>
        /// 验证硬件标识是否匹配
        /// </summary>
        /// <param name="storedHardwareId">存储的硬件标识</param>
        /// <returns>如果匹配返回true，否则返回false</returns>
        public static bool ValidateHardwareId(string storedHardwareId)
        {
            if (string.IsNullOrEmpty(storedHardwareId))
            {
                return false;
            }

            string currentHardwareId = GetHardwareId();
            return string.Equals(currentHardwareId, storedHardwareId, StringComparison.OrdinalIgnoreCase);
        }
    }
}