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

namespace Clipman
{
    internal static class NativeMethods
    {
        public const int WM_HOTKEY = 0x0312;
        public const int WM_CLIPBOARDUPDATE = 0x031D;
        public const int SW_SHOWNORMAL = 1;
        public const int SW_RESTORE = 9;
        public const int VK_CONTROL = 0x11;
        public const int VK_SHIFT = 0x10;
        public const int VK_MENU = 0x12;
        public const int VK_LWIN = 0x5B;
        public const int VK_RWIN = 0x5C;
        public const int VK_V = 0x56;
        public const int KEYEVENTF_KEYUP = 0x0002;
        public const int INPUT_KEYBOARD = 1;

        [StructLayout(LayoutKind.Sequential)]
        public struct Input
        {
            public int Type;
            public InputUnion Data;

            public KeyboardInputData Keyboard
            {
                get { return Data.Keyboard; }
            }
        }

        [StructLayout(LayoutKind.Explicit)]
        public struct InputUnion
        {
            [FieldOffset(0)]
            public KeyboardInputData Keyboard;

            [FieldOffset(0)]
            public MouseInputData Mouse;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct KeyboardInputData
        {
            public ushort VirtualKey;
            public ushort ScanCode;
            public uint Flags;
            public uint Time;
            public UIntPtr ExtraInfo;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct MouseInputData
        {
            public int X;
            public int Y;
            public uint MouseData;
            public uint Flags;
            public uint Time;
            public UIntPtr ExtraInfo;
        }

        [Flags]
        public enum Modifiers : uint
        {
            None = 0,
            Alt = 0x0001,
            Control = 0x0002,
            Shift = 0x0004,
            Windows = 0x0008,
            NoRepeat = 0x4000
        }

        [DllImport("user32.dll")]
        public static extern IntPtr GetForegroundWindow();

        [DllImport("user32.dll")]
        public static extern IntPtr GetClipboardOwner();

        [DllImport("user32.dll")]
        public static extern bool SetForegroundWindow(IntPtr hWnd);

        [DllImport("user32.dll")]
        public static extern bool IsWindow(IntPtr hWnd);

        [DllImport("user32.dll")]
        public static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

        [DllImport("user32.dll")]
        public static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint processId);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool RegisterHotKey(IntPtr hWnd, int id, Modifiers fsModifiers, Keys vk);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool UnregisterHotKey(IntPtr hWnd, int id);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool AddClipboardFormatListener(IntPtr hwnd);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool RemoveClipboardFormatListener(IntPtr hwnd);

        [DllImport("user32.dll")]
        public static extern uint GetClipboardSequenceNumber();

        [DllImport("user32.dll")]
        public static extern int GetMessageTime();

        [DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
        public static extern uint RegisterClipboardFormat(string lpszFormat);

        [DllImport("user32.dll")]
        public static extern bool IsClipboardFormatAvailable(uint format);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool OpenClipboard(IntPtr hWndNewOwner);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern bool CloseClipboard();

        [DllImport("user32.dll", SetLastError = true)]
        public static extern IntPtr GetClipboardData(uint uFormat);

        [DllImport("kernel32.dll", SetLastError = true)]
        public static extern IntPtr GlobalLock(IntPtr hMem);

        [DllImport("kernel32.dll", SetLastError = true)]
        public static extern bool GlobalUnlock(IntPtr hMem);

        [DllImport("kernel32.dll", SetLastError = true)]
        public static extern UIntPtr GlobalSize(IntPtr hMem);

        [DllImport("user32.dll")]
        public static extern short GetAsyncKeyState(int vKey);

        [DllImport("user32.dll", SetLastError = true)]
        public static extern uint SendInput(uint inputCount, Input[] inputs, int inputSize);

    }
}