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using Microsoft.Win32;
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using System;
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using System.Management;
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using System.Runtime.InteropServices;
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using SLID = System.Guid;
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namespace Coderxi.Util {
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    public class WindowsInfo {
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        public enum SL_GENUINE_STATE {
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            SL_GEN_STATE_IS_GENUINE = 0,
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            SL_GEN_STATE_INVALID_LICENSE = 1,
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            SL_GEN_STATE_TAMPERED = 2,
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            SL_GEN_STATE_LAST = 3
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        }
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        [DllImportAttribute("Slwga.dll", EntryPoint = "SLIsGenuineLocal", CharSet = CharSet.None, ExactSpelling = false, SetLastError = false, PreserveSig = true, CallingConvention = CallingConvention.Winapi, BestFitMapping = false, ThrowOnUnmappableChar = false)]
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        [PreserveSigAttribute()]
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        internal static extern uint SLIsGenuineLocal(ref SLID slid, [In, Out] ref SL_GENUINE_STATE genuineState, IntPtr val3);
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        /// <summary>
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        /// Windows系统构建版本
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        /// </summary>
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        public static string WindowsReleaseId => Registry.GetValue(@"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion", "ReleaseId", "").ToString();
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        /// <summary>
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        /// Windows是否激活
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        /// </summary>
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        private static bool WindowsIsActive {
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            get {
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                bool _IsGenuineWindows = false;
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                Guid ApplicationID = new Guid("55c92734-d682-4d71-983e-d6ec3f16059f"); //Application ID GUID http://technet.microsoft.com/en-us/library/dd772270.aspx
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                SLID windowsSlid = (Guid)ApplicationID;
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                SL_GENUINE_STATE genuineState = SL_GENUINE_STATE.SL_GEN_STATE_LAST;
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                uint result = SLIsGenuineLocal(ref windowsSlid, ref genuineState, IntPtr.Zero);
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                if (result == 0) _IsGenuineWindows = (genuineState == SL_GENUINE_STATE.SL_GEN_STATE_IS_GENUINE);
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                return _IsGenuineWindows;
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            }
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        }
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        /// <summary>
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        /// Windows激活状态
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        /// </summary>
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        public static string WindowsActiveState => Environment.OSVersion.Version.Major < 6 ? "不支持的系统" : WindowsIsActive ? "已激活" : "未激活";
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        /// <summary>
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        /// Windows系统版本
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        /// </summary>
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        public static string WindowsVersion {
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            get {
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                using (ManagementObjectSearcher win32OperatingSystem = new ManagementObjectSearcher("select * from Win32_OperatingSystem")) {
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                    foreach (ManagementObject obj in win32OperatingSystem.Get())
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                        return $"{obj["Caption"]} ({obj["OSArchitecture"]})";
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                }
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                return "未知版本";
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            }
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        }
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    }
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}