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

namespace Yaulw.Win32
{
    /// <summary>
    /// Win32 Structs
    /// </summary>
    public static class Structures
    {
        [StructLayout(LayoutKind.Sequential)]
        public struct RECT
        {
            public int left;
            public int top;
            public int right;
            public int bottom;
            public static RECT FromXYWH(int x, int y, int width, int height)
            {
                RECT rect = new RECT();
                rect.left = x;
                rect.top = y;
                rect.right = x + width;
                rect.bottom = y + height;
                return rect;
            }
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct SIZE
        {
            public int cx;
            public int cy;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct ShellExecuteInfo
        {
            public int cbSize;
            public uint fMask;
            public IntPtr hwnd;
            public string lpVerb;
            public string lpFile;
            public string lpParameters;
            public string lpDirectory;
            public uint nShow;
            public IntPtr hInstApp;
            public IntPtr lpIDList;
            public string lpClass;
            public IntPtr hkeyClass;
            public uint dwHotKey;
            public IntPtr hIcon_Monitor; // union DUMMYUNIONNAME
            public IntPtr hProcess;
        }

        [StructLayout(LayoutKind.Explicit, Size = 28)]
        public struct INPUT
        {
            [FieldOffset(0)]
            public uint type;
            [FieldOffset(4)]
            public KEYBDINPUT ki;
        };

        [StructLayout(LayoutKind.Sequential)]
        public struct KEYBDINPUT
        {
            public ushort wVk;
            public ushort wScan;
            public uint dwFlags;
            public long time;
            public uint dwExtraInfo;
        };

        [StructLayout(LayoutKind.Sequential)]
        public struct MONITORINFOEX
        {
            public int cbSize;
            public RECT rcMonitor;
            public RECT rcWork;
            public int dwFlags;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
            public string szDeviceName;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 4)]
        public struct PAINTSTRUCT
        {
            public IntPtr hdc;
            public int fErase;
            public RECT rcPaint;
            public int fRestore;
            public int fIncUpdate;
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)]
            public byte[] rgbReserved;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct NCCALCSIZE_PARAMS
        {
            public RECT rgrc0, rgrc1, rgrc2;
            public IntPtr lppos;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct SERVICE_STATUS_PROCESS
        {
            public int dwServiceType;
            public int dwCurrentState;
            public int dwControlsAccepted;
            public int dwWin32ExitCode;
            public int dwServiceSpecificExitCode;
            public int dwCheckPoint;
            public int dwWaitHint;
            public int dwProcessId;
            public int dwServiceFlags;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct FileDescriptorSet
        {
            // how many are set?
            public int Count;         
            // an array of Socket handles            
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = MaxCount)]
            public IntPtr[] Array;

            public static readonly int Size = Marshal.SizeOf(typeof(FileDescriptorSet));
            public static readonly FileDescriptorSet Empty = new FileDescriptorSet(0);
            public const int MaxCount = 64;

            public FileDescriptorSet(int count)
            {
                Count = count;
                Array = count == 0 ? null : new IntPtr[MaxCount];
            }
        }

        /// <summary>
        /// Structure used in select() call, taken from the BSD file sys/time.h.
        /// </summary>
        [StructLayout(LayoutKind.Sequential)]
        public struct TimeValue
        {
            public int Seconds;  // seconds
            public int Microseconds; // and microseconds
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct WSAData
        {
            public short wVersion;
            public short wHighVersion;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 257)]
            public string szDescription;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 129)]
            public string szSystemStatus;
            public short iMaxSockets;
            public short iMaxUdpDg;
            public int lpVendorInfo;
        }
    }
}