using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace HotelPms.Share.Windows.Component
{
    /// <summary>
    /// Û¯³êÄ¢éEBhEbZ[Wðí
    /// </summary>
    public static class RemovePeekMessage
    {
        #region è
        /// <summary>
        /// Y·éEBhEÉÄ`æªKvÆOSª»fµ½Æ«É|Xg³êébZ[W
        /// </summary>
        private const int WM_PAINT = 0xF;

        /// <summary>
        ///  EBhEÌNCAgÌæÅ[U[ª}EXÌÚ®ðµ½Æ«É|Xg³êébZ[W
        /// </summary>
        private const int WM_MOUSEMOVE = 0x200;

        /// <summary>
        /// EBhEÌNCAgÌæÅ[U[ª}EXÌ¶{^ðµ½Æ«É|Xg³êébZ[W
        /// </summary>
        private const int WM_LBUTTONDOWN = 0x201;

        /// <summary>
        /// EBhEÌNCAgÌæÅ[U[ª}EXÌ¶{^ð£µ½Æ«É|Xg³êébZ[W
        /// </summary>
        private const int WM_LBUTTONUP = 0x202;

        /// <summary>
        /// }EX|C^ªÌæOÉo½É|Xg³êébZ[W
        /// </summary>
        private const int WM_MOUSELEAVE = 0x2A3;

        private const int WM_KEYFIRST = 0x100;
        private const int WM_KEYLAST = 0x109;

        private const int WM_MOUSEFIRST = 0x200;
        private const int WM_MOUSELAST = 0x20D;

        #endregion

        #region \¢Ì
        /// <summary>
        /// MSG \¢Ì^
        /// </summary>
        [StructLayout(LayoutKind.Sequential)]
        public struct MSG
        {
            /// <summary>
            /// EBhEnh
            /// </summary>
            public IntPtr hWnd;
            /// <summary>
            /// MessageID
            /// </summary>
            public int msg;
            /// <summary>
            /// WParamtB[hiMessageID²ÆÉá¤æ)
            /// </summary>
            public IntPtr wParam;
            /// <summary>
            /// LParamtB[hiMessageID²ÆÉá¤æ)
            /// </summary>
            public IntPtr lParam;
            /// <summary>
            /// Ô
            /// </summary>
            public int time;
            /// <summary>
            /// J[\ÊuiXN[ÀWj
            /// </summary>
            public POINTAPI pt;
        }

        /// <summary>
        /// POINTAPI\¢Ì
        /// </summary>
        [StructLayout(LayoutKind.Sequential)]
        public struct POINTAPI
        {
            /// <summary>
            /// XÀW
            /// </summary>
            public int x;
            /// <summary>
            /// YÀW
            /// </summary>
            public int y;
        }
        #endregion

        #region ñ^
        /// <summary>
        /// wRemoveMsgÅpÂ\ÈIvV
        /// </summary>
        enum EPeekMessageOption
        {
            /// <summary>
            /// ãbZ[WðL[©çíµÈ¢
            /// </summary>
            PM_NOREMOVE = 0,
            /// <summary>
            /// ãbZ[WðL[©çí·é
            /// </summary>
            PM_REMOVE
        }
        #endregion

        #region DllImport
        /// <summary>
        /// XbhÌbZ[WL[ÉbZ[Wª é©Ç¤©ð`FbNµ
        ///  êÎAwè³ê½\¢ÌÉ»ÌbZ[Wði[µÜ·
        /// </summary>
        /// <param name="lpMsg"> bZ[Wîñði[·éAMSG \¢Ì^ÏÌ|C^ðwèµÜ·</param>
        /// <param name="hWnd">bZ[Wðæ¾·éEBhEÌnhðwèµÜ·BSÄÌêÍ NULL</param>
        /// <param name="wMsgFilterMin">bZ[WÌÅ¬lðwèµAtB^OµÜ·BµÈ¢êÍ0</param>
        /// <param name="wMsgFilterMax">bZ[WÌÅålðwèµAtB^OµÜ·BµÈ¢êÍ0</param>
        /// <param name="wRemoveMsg">ãbZ[WðL[ðí·é©Û©</param>
        /// <returns>bZ[Wðæ¾µ½Æ«Í 0 ÈOAæ¾µÈ©Á½Æ«Í 0</returns>
        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool PeekMessage(
            out MSG lpMsg,
            int hWnd,
            int wMsgFilterMin,
            int wMsgFilterMax,
            EPeekMessageOption wRemoveMsg
        );

        /// <summary>
        /// wè³ê½ MSG \¢Ì^ÏÉbZ[Wði[µÜ·
        /// </summary>
        /// <param name="lpMsg">bZ[Wîñði[·éAMSG \¢Ì^ÏÌ|C^ðwèµÜ·</param>
        /// <param name="hWnd">bZ[Wðæ¾·éEBhEÌnhðwèµÜ·BSÄÌêÍ NULL</param>
        /// <param name="wMsgFilterMin">bZ[WÌÅ¬lðwèµAtB^OµÜ·BµÈ¢êÍ0</param>
        /// <param name="wMsgFilterMax">bZ[WÌÅålðwèµAtB^OµÜ·BµÈ¢êÍ0</param>
        /// <returns></returns>
        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool GetMessage(
            out MSG lpMsg,
            int hWnd,
            int wMsgFilterMin,
            int wMsgFilterMax
        );

        /// <summary>
        /// wè³ê½EBhEbZ[WðEBhEvV[WÉfBXpb`µÜ·
        /// </summary>
        /// <param name="lpMsg">fBXpb`·ébZ[Wði[µ½ MSG \¢ÌÏÌ|C^ðwèµÜ·</param>
        /// <returns>EBhEvV[WÌßèl</returns>
        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr DispatchMessage(
             out MSG lpMsg
        );
        #endregion

        #region \bh
        /// <summary>
        /// Û¯³êÄ¢éEBhEbZ[WðíµÜ·B
        /// </summary>
        public static void Invoke()
        {
            //Console.WriteLine("y¦zRemovePeekMessage.Invoke():±Ì_ÌCxg·×ÄíÀsJn");
            MSG wm;
            while (PeekMessage(out wm, 0, WM_KEYFIRST, WM_KEYLAST, EPeekMessageOption.PM_REMOVE)) { }
            while (PeekMessage(out wm, 0, WM_MOUSEFIRST, WM_MOUSELAST, EPeekMessageOption.PM_REMOVE)) { }


#if false
            System.Diagnostics.Debug.WriteLine("Invoke begin");
            MSG wm;
            while (true)
            {
                bool ret = PeekMessage(out wm, 0, 0, 0, EPeekMessageOption.PM_REMOVE);
                System.Diagnostics.Debug.WriteLine(wm.msg.ToString());
                System.Diagnostics.Debug.WriteLine(ret.ToString());
                if (!ret) { break; }

                switch (wm.msg)
                {
                    case WM_LBUTTONUP:
                    case WM_MOUSELEAVE:
                    case WM_PAINT:
                        System.Diagnostics.Debug.WriteLine(wm.msg.ToString());
                        DispatchMessage(out wm);
                        break;
                }
            }
            System.Diagnostics.Debug.WriteLine("Invoke end");
#endif
        }
        #endregion
    }
}