using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Management;
using System.Threading;
using System.Security.Permissions;
using System.Security;
using System.ComponentModel;
using mshtml;
using System.Reflection;

namespace SuperMap.RealEstate.SecurityDevice
{
    [SecuritySafeCritical]
    [DefaultEvent("DeviceStateChanged")]
    public partial class SecurityDeviceControl : UserControl
    {
        IClientSecurityDevice _SecurityDevice = new UsbKeyLicenseDevice();

        public SecurityDeviceControl()
        {
            try
            {
                InitializeComponent();
                //注册消息
                _SecurityDevice.MessageChanged += new ClientSecurityDeviceMessageHandler(SecurityDeviceControl_MessageChanged);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        /// <summary>
        /// 设备初始化，并连接设备。
        /// </summary>
        /// <returns>是否找到设备</returns>
        public bool  Device_Connect()
        {
            bool _result = false;
            try
            {
                SetValue(null);
                _result=Device_Read();
                RegisterNotification();
                return _result;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                return false;
            }
        }

        public event ClientSecurityDeviceStateHandler DeviceStateChanged;

        protected virtual void OnDeviceStateChanged(ClientSecurityDeviceEventArgs e)
        {
            if (DeviceStateChanged != null)
            {
                DeviceStateChanged(this, e);
            }
        }

        /// <summary>
        /// 用户授权时间
        /// </summary>
        public string User_Expiry
        {
            get
            {
                if (string.IsNullOrEmpty(textBoxDate.Text))
                    return DateTime.Now.AddYears(1).ToString("yyyy-MM-dd HH:mm:ss");
                else
                {
                    DateTime _DateTime=new DateTime();
                    if (DateTime.TryParse(textBoxDate.Text, out _DateTime))
                        return DateTime.Parse(textBoxDate.Text).ToString("yyyy-MM-dd HH:mm:ss");
                    else
                        return DateTime.Now.AddYears(1).ToString("yyyy-MM-dd HH:mm:ss");
                }
            }
        }

        public string Message
        {
            get
            {
                return _SecurityDevice.Message;
            }
            set
            {
                _SecurityDevice.Message = value;
                OnDeviceMessageChanged(new ClientSecurityDeviceMessageEventArgs(value));
            }
        }
        private void OnDeviceMessageChanged(ClientSecurityDeviceMessageEventArgs e)
        {
            if (DeviceMessageChanged != null)
            {
                DeviceMessageChanged(this, e);
            }
        }

        public event ClientSecurityDeviceMessageHandler DeviceMessageChanged ;

        void SecurityDeviceControl_MessageChanged(object sender, ClientSecurityDeviceMessageEventArgs e)
        {
            if (DesignMode)
                return;
            OnDeviceMessageChanged(e);
        }

        public void SetValue(ClientSecurityDeviceObject value)
        {
            if (DesignMode)
                return;
            textBoxName.Text = (value==null) ?"": value.Name;
            textBoxUser.Text = (value == null) ? "" : value.User;
            textBoxKey.Text = (value == null) ? "" : value.Key;
            textBoxDate.Text = (value == null) ? "" : value.Date;
            textBoxUrl.Text = (value == null) ? "" : value.Url;
            //_DeviceKey = (value == null) ? "" : (value.Name + "|" + value.User + "|" + value.Key + "|" + value.Date + "|" + value.Url);
        }

        private ClientSecurityDeviceObject GetValue()
        {
            if (DesignMode)
                return null;
            ClientSecurityDeviceObject _SecurityDeviceInfo = new ClientSecurityDeviceObject();
            _SecurityDeviceInfo.Name = textBoxName.Text;
            _SecurityDeviceInfo.User = textBoxUser.Text;
            _SecurityDeviceInfo.Key = textBoxKey.Text;
            _SecurityDeviceInfo.Date = textBoxDate.Text;
            _SecurityDeviceInfo.Url = textBoxUrl.Text;
            return _SecurityDeviceInfo;
        }

        //string _DeviceKey = string.Empty;

        //public string DeviceKey
        //{
        //    get
        //    {
        //        return _DeviceKey;
        //    }
        //}

        #region WndProc
        /// <summary>
        /// 
        /// </summary>
        /// <param name="m">要处理的 WindowsSystem.Windows.Forms.Message。</param>
        protected override void WndProc(ref Message m)
        {
            switch (m.Msg)
            {
                case SecurityDeviceHelper.WM_DEVICECHANGE:
                    ListenerNotification(ref m);
                    break;
            }
            base.WndProc(ref m);
        }
        #endregion

        #region ListenerNotification
        /// <summary>
        /// 侦听设备通知
        /// </summary>
        /// <param name="msg">消息</param>
        private void ListenerNotification(ref Message msg)
        {
            int wParam = (int)msg.WParam;
            if (wParam == SecurityDeviceHelper.DBT_DEVICEARRIVAL)
            {
                int devType = Marshal.ReadInt32(msg.LParam, 4);
                if (devType == SecurityDeviceHelper.DBT_DEVTYP_DEVICEINTERFACE)
                {
                    Device_Read();
                }
            }
            if (wParam ==SecurityDeviceHelper.DBT_DEVICEREMOVECOMPLETE)
            {
                Device_Remove();
            }
        }
        #endregion

        #region Device_Read

        public bool Device_Read()
        {
            ClientSecurityDeviceObject _SecurityDeviceInfo;
            if (_SecurityDevice.Open())
            {
                if (_SecurityDevice.Read(out _SecurityDeviceInfo))
                {
                    SetValue(_SecurityDeviceInfo);
                    OnDeviceStateChanged(new ClientSecurityDeviceEventArgs(_SecurityDeviceInfo, ClientSecurityDeviceState.Insert));
                    
                }
                _SecurityDevice.Close();
                return true;
            }
            else
            {
                return false;
            }
        }
        #endregion

        #region Device_Remove
        private void Device_Remove()
        {
            //Message = "数字证书被拔出。";
            OnDeviceMessageChanged(new ClientSecurityDeviceMessageEventArgs("数字证书被拔出"));
            ClientSecurityDeviceObject _SecurityDeviceInfo = GetValue();
            OnDeviceStateChanged(new ClientSecurityDeviceEventArgs(_SecurityDeviceInfo, ClientSecurityDeviceState.Remove));
            SetValue(null);
        }
        #endregion

        #region RegisterNotification
        /// <summary>
        /// 注册设备通知
        /// </summary>
        void RegisterNotification()
        {
            SecurityDeviceHelper.DEV_BROADCAST_DEVICEINTERFACE dbi = new SecurityDeviceHelper.DEV_BROADCAST_DEVICEINTERFACE();
            int size = Marshal.SizeOf(dbi);
            dbi.dbcc_size = size;
            dbi.dbcc_devicetype = SecurityDeviceHelper.DBT_DEVTYP_DEVICEINTERFACE;
            dbi.dbcc_reserved = 0;
            dbi.dbcc_classguid = SecurityDeviceHelper.GUID_DEVINTERFACE_USB_DEVICE;
            dbi.dbcc_name = 0;
            IntPtr buffer = Marshal.AllocHGlobal(size);
            Marshal.StructureToPtr(dbi, buffer, true);
            if (SecurityDeviceHelper.RegisterDeviceNotification(Handle, buffer, SecurityDeviceHelper.DEVICE_NOTIFY_WINDOW_HANDLE) == IntPtr.Zero)
            {
                MessageBox.Show(SecurityDeviceHelper.GetLastError().ToString());
            }
        }
        #endregion
    }
}