using System;
using System.Runtime.InteropServices;
using System.Security;
using System.Windows.Forms;

namespace SmartCoalApplication.SystemLayer
{
    [SuppressUnmanagedCodeSecurity]
    public static class SafeNativeMethods
    {
        [DllImport("user32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        internal static extern bool DrawMenuBar(IntPtr hWnd);

        [DllImport("user32.dll", SetLastError = false)]
        internal static extern IntPtr GetSystemMenu(
            IntPtr hWnd,
            [MarshalAs(UnmanagedType.Bool)] bool bRevert);

        [DllImport("user32.dll", SetLastError = false)]
        internal static extern int EnableMenuItem(
            IntPtr hMenu,
            uint uIDEnableItem,
            uint uEnable);

        [DllImport("user32.dll", SetLastError = false)]
        [return: MarshalAs(UnmanagedType.Bool)]
        internal static extern bool FlashWindow(
            IntPtr hWnd,
            [MarshalAs(UnmanagedType.Bool)] bool bInvert);

        [DllImport("user32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        internal static extern bool ShowScrollBar(
            IntPtr hWnd,
            int wBar,
            [MarshalAs(UnmanagedType.Bool)] bool bShow);

        [DllImport("user32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        internal static extern bool GetLayeredWindowAttributes(
            IntPtr hwnd,
            out uint pcrKey,
            out byte pbAlpha,
            out uint pdwFlags);

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Portability", "CA1901:PInvokeDeclarationsShouldBePortable", MessageId = "2")]
        [DllImport("user32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        internal static extern bool SetLayeredWindowAttributes(
            IntPtr hwnd,
            uint crKey,
            byte bAlpha,
            uint dwFlags);

        [DllImport("gdi32.dll", SetLastError = true)]
        internal static extern IntPtr CreateDIBSection(
            IntPtr hdc,
            ref NativeStructs.BITMAPINFO pbmi,
            uint iUsage,
            out IntPtr ppvBits,
            IntPtr hSection,
            uint dwOffset);

        [DllImport("user32.dll", SetLastError = false)]
        internal static extern int GetUpdateRgn(
            IntPtr hWnd,
            IntPtr hRgn,
            [MarshalAs(UnmanagedType.Bool)] bool bErase);

        [DllImport("user32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
        internal static extern IntPtr FindWindowExW(
            IntPtr hwndParent,
            IntPtr hwndChildAfter,
            [MarshalAs(UnmanagedType.LPWStr)] string lpszClass,
            [MarshalAs(UnmanagedType.LPWStr)] string lpszWindow);

        [DllImport("user32.dll", SetLastError = false)]
        internal static extern IntPtr SendMessageW(
            IntPtr hWnd,
            uint msg,
            IntPtr wParam,
            IntPtr lParam);

        [DllImport("user32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        internal extern static bool PostMessageW(
            IntPtr handle,
            uint msg,
            IntPtr wParam,
            IntPtr lParam);

        [DllImport("user32.dll", SetLastError = true)]
        internal static extern uint GetWindowLongW(
            IntPtr hWnd,
            int nIndex);

        [DllImport("user32.dll", SetLastError = true)]
        internal static extern uint SetWindowLongW(
            IntPtr hWnd,
            int nIndex,
            uint dwNewLong);

        [DllImport("msvcrt.dll", CallingConvention = CallingConvention.Cdecl, SetLastError = false)]
        internal static extern unsafe void memcpy(void* dst, void* src, UIntPtr length);

        [DllImport("msvcrt.dll", CallingConvention = CallingConvention.Cdecl, SetLastError = false)]
        internal static extern unsafe void memset(void* dst, int c, UIntPtr length);

        [DllImport("User32.dll", SetLastError = false)]
        internal static extern int GetSystemMetrics(int nIndex);

        [DllImport("kernel32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        internal static extern bool QueryPerformanceCounter(out ulong lpPerformanceCount);

        [DllImport("kernel32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        internal static extern bool QueryPerformanceFrequency(out ulong lpFrequency);

        [DllImport("kernel32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        internal static extern bool CloseHandle(IntPtr hObject);

        [DllImport("kernel32.dll", SetLastError = true)]
        internal static extern uint WaitForSingleObject(IntPtr hHandle,uint dwMilliseconds);

        [DllImport("kernel32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        internal static extern bool SetHandleInformation(
    IntPtr hObject,
    uint dwMask,
    uint dwFlags);

        [DllImport("user32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
        internal static extern IntPtr FindWindowW(
    [MarshalAs(UnmanagedType.LPWStr)] string lpClassName,
    [MarshalAs(UnmanagedType.LPWStr)] string lpWindowName);

        [DllImport("user32.dll", SetLastError = false)]
        internal static extern uint GetWindowThreadProcessId(
    IntPtr hWnd,
    out uint lpdwProcessId);

        [DllImport("kernel32.dll", SetLastError = true)]
        internal static extern uint WaitForMultipleObjects(
            uint nCount,
            IntPtr[] lpHandles,
            [MarshalAs(UnmanagedType.Bool)] bool bWaitAll,
            uint dwMilliseconds);

        [DllImport("Gdi32.Dll", SetLastError = true)]
        public extern static IntPtr CreateCompatibleDC(IntPtr hdc);

        [DllImport("Gdi32.dll", SetLastError = true)]
        public extern static uint DeleteDC(IntPtr hdc);

        [DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        internal static extern bool GetVersionEx(ref NativeStructs.OSVERSIONINFOEX lpVersionInfo);
        internal static uint WaitForMultipleObjects(IntPtr[] lpHandles, bool bWaitAll, uint dwMilliseconds)
        {
            return WaitForMultipleObjects((uint)lpHandles.Length, lpHandles, bWaitAll, dwMilliseconds);
        }

        [DllImport("wtsapi32.dll", SetLastError = true)]
        internal static extern uint WTSRegisterSessionNotification(IntPtr hWnd, uint dwFlags);

        [DllImport("wtsapi32.dll", SetLastError = true)]
        internal static extern uint WTSUnRegisterSessionNotification(IntPtr hWnd);

        [DllImport("Gdi32.dll", SetLastError = true)]
        internal unsafe static extern uint GetRegionData(
            IntPtr hRgn,
            uint dwCount,
            NativeStructs.RGNDATA* lpRgnData);

        [DllImport("Gdi32.dll", SetLastError = true)]
        internal unsafe static extern IntPtr CreateRectRgn(
            int nLeftRect,
            int nTopRect,
            int nRightRect,
            int nBottomRect);

        [DllImport("Gdi32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        public extern static bool DeleteObject(IntPtr hObject);

        [DllImport("kernel32.dll", SetLastError = true)]
        internal static extern IntPtr VirtualAlloc(
            IntPtr lpAddress,
            UIntPtr dwSize,
            uint flAllocationType,
            uint flProtect);

        [DllImport("kernel32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        internal static extern bool VirtualFree(
            IntPtr lpAddress,
            UIntPtr dwSize,
            uint dwFreeType);

        [DllImport("Kernel32.dll", SetLastError = false)]
        internal static extern IntPtr HeapAlloc(IntPtr hHeap, uint dwFlags, UIntPtr dwBytes);

        [DllImport("Kernel32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        internal static extern bool HeapFree(IntPtr hHeap, uint dwFlags, IntPtr lpMem);

        [DllImport("Kernel32.dll", SetLastError = false)]
        internal static extern UIntPtr HeapSize(IntPtr hHeap, uint dwFlags, IntPtr lpMem);

        [DllImport("Kernel32.dll", SetLastError = true)]
        internal static extern IntPtr HeapCreate(
            uint flOptions,
            [MarshalAs(UnmanagedType.SysUInt)] IntPtr dwInitialSize,
            [MarshalAs(UnmanagedType.SysUInt)] IntPtr dwMaximumSize
            );

        [DllImport("Kernel32.dll", SetLastError = true)]
        internal static extern uint HeapDestroy(IntPtr hHeap);

        [DllImport("Kernel32.Dll", SetLastError = true)]
        internal unsafe static extern uint HeapSetInformation(
            IntPtr HeapHandle,
            int HeapInformationClass,
            void* HeapInformation,
            uint HeapInformationLength
            );

        [DllImport("user32.dll", SetLastError = false)]
        [return: MarshalAs(UnmanagedType.Bool)]
        internal static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

        //
        // 以下是参考https://www.fangsi.net/30.html，为了实现hint
        //
        /// <summary>
        /// 
        /// </summary>
        /// <param name="hWnd"></param>
        /// <param name="msg"></param>
        /// <param name="wParam"></param>
        /// <param name="lParam"></param>
        /// <returns></returns>
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        private static extern Int32 SendMessage(IntPtr hWnd, int msg, int wParam, [MarshalAs(UnmanagedType.LPWStr)] string lParam);

        [DllImport("user32.dll")]
        private static extern bool GetComboBoxInfo(IntPtr hwnd, ref COMBOBOXINFO pcbi);

        [StructLayout(LayoutKind.Sequential)]
        private struct COMBOBOXINFO
        {
            public int cbSize;
            public RECT rcItem;
            public RECT rcButton;
            public IntPtr stateButton;
            public IntPtr hwndCombo;
            public IntPtr hwndItem;
            public IntPtr hwndList;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct RECT
        {
            public int left;
            public int top;
            public int right;
            public int bottom;
        }

        private const int EM_SETCUEBANNER = 0x1501;

        public static void SetCueText(Control control, string text)
        {
            if (control is ComboBox)
            {
                COMBOBOXINFO info = GetComboBoxInfo(control);
                SendMessage(info.hwndItem, EM_SETCUEBANNER, 0, text);
            }
            else
            {
                SendMessage(control.Handle, EM_SETCUEBANNER, 0, text);
            }
        }

        private static COMBOBOXINFO GetComboBoxInfo(Control control)
        {
            COMBOBOXINFO info = new COMBOBOXINFO();
            info.cbSize = Marshal.SizeOf(info);
            GetComboBoxInfo(control.Handle, ref info);
            return info;
        }
    }
}