// Copyright (c) Microsoft Corporation
// The Microsoft Corporation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System;
using System.Runtime.InteropServices;

namespace MouseJumpUI.Helpers
{
    // Win32 functions required for temporary workaround for issue #1273
    internal class NativeMethods
    {
        [DllImport("user32.dll")]
        internal static extern uint SendInput(uint nInputs, INPUT[] pInputs, int cbSize);

        [DllImport("user32.dll")]
        internal static extern int GetSystemMetrics(SystemMetric smIndex);

        [StructLayout(LayoutKind.Sequential)]
        public struct INPUT
        {
            internal INPUTTYPE type;
            internal InputUnion data;

            internal static int Size
            {
                get { return Marshal.SizeOf(typeof(INPUT)); }
            }
        }

        [StructLayout(LayoutKind.Explicit)]
        internal struct InputUnion
        {
            [FieldOffset(0)]
            internal MOUSEINPUT mi;
            [FieldOffset(0)]
            internal KEYBDINPUT ki;
            [FieldOffset(0)]
            internal HARDWAREINPUT hi;
        }

        [StructLayout(LayoutKind.Sequential)]
        internal struct MOUSEINPUT
        {
            internal int dx;
            internal int dy;
            internal int mouseData;
            internal uint dwFlags;
            internal uint time;
            internal UIntPtr dwExtraInfo;
        }

        [StructLayout(LayoutKind.Sequential)]
        internal struct KEYBDINPUT
        {
            internal short wVk;
            internal short wScan;
            internal uint dwFlags;
            internal int time;
            internal UIntPtr dwExtraInfo;
        }

        [StructLayout(LayoutKind.Sequential)]
        internal struct HARDWAREINPUT
        {
            internal int uMsg;
            internal short wParamL;
            internal short wParamH;
        }

        internal enum INPUTTYPE : uint
        {
            INPUT_MOUSE = 0,
            INPUT_KEYBOARD = 1,
            INPUT_HARDWARE = 2,
        }

        internal enum MOUSE_INPUT_FLAGS : uint
        {
            MOUSEEVENTF_MOVE = 0x0001,
            MOUSEEVENTF_LEFTDOWN = 0x0002,
            MOUSEEVENTF_LEFTUP = 0x0004,
            MOUSEEVENTF_RIGHTDOWN = 0x0008,
            MOUSEEVENTF_RIGHTUP = 0x0010,
            MOUSEEVENTF_MIDDLEDOWN = 0x0020,
            MOUSEEVENTF_MIDDLEUP = 0x0040,
            MOUSEEVENTF_XDOWN = 0x0080,
            MOUSEEVENTF_XUP = 0x0100,
            MOUSEEVENTF_WHEEL = 0x0800,
            MOUSEEVENTF_HWHEEL = 0x1000,
            MOUSEEVENTF_MOVE_NOCOALESCE = 0x2000,
            MOUSEEVENTF_VIRTUALDESK = 0x4000,
            MOUSEEVENTF_ABSOLUTE = 0x8000,
        }

        internal enum SystemMetric
        {
            SM_CXSCREEN = 0,
            SM_CYSCREEN = 1,
        }

        internal static int CalculateAbsoluteCoordinateX(int x)
        {
            return (x * 65536) / GetSystemMetrics(SystemMetric.SM_CXSCREEN);
        }

        internal static int CalculateAbsoluteCoordinateY(int y)
        {
            return (y * 65536) / GetSystemMetrics(SystemMetric.SM_CYSCREEN);
        }
    }
}