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

namespace Dongke.WinForm.Controls.InvoiceLayout
{
    public class DipClass
    {
        [DllImport("user32.dll")]
        static extern IntPtr GetDC(IntPtr ptr);

        [DllImport("gdi32.dll")]
        static extern int GetDeviceCaps(IntPtr hdc, int nIndex);

        [DllImport("user32.dll", EntryPoint = "ReleaseDC")]
        static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDC);

        const int HORZRES = 8;
        const int VERTRES = 10;
        const int LOGPIXELSX = 88;
        const int LOGPIXELSY = 90;
        const int DESKTOPVERTRES = 117;
        const int DESKTOPHORZRES = 118;

        /// <summary)
        /// 获取屏幕分辨率当前物理大小
        /// </summary)
        public static Size WorkingArea
        {
            get
            {
                IntPtr hdc = GetDC(IntPtr.Zero);
                Size size = new Size
                {
                    Width = GetDeviceCaps(hdc, HORZRES),
                    Height = GetDeviceCaps(hdc, VERTRES)
                };
                ReleaseDC(IntPtr.Zero, hdc);
                return size;
            }
        }

        /// <summary>
        /// 当前系统DPI_X 大小 一般为96
        /// </summary>
        public static int DpiX
        {
            get
            {
                IntPtr hdc = GetDC(IntPtr.Zero);
                int dpiX = GetDeviceCaps(hdc, LOGPIXELSX);
                ReleaseDC(IntPtr.Zero, hdc);
                return dpiX;
            }
        }

        /// <summary>
        /// 当前系统DPI_Y 大小 一般为96
        /// </summary>
        public static int DpiY
        {
            get
            {
                IntPtr hdc = GetDC(IntPtr.Zero);
                int dpiY = GetDeviceCaps(hdc, LOGPIXELSY);
                ReleaseDC(IntPtr.Zero, hdc);
                return dpiY;
            }
        }

        /// <summary>
        /// 当前系统DPI_XY 大小 一般为96
        /// </summary>
        public static Point Dpi
        {
            get
            {
                IntPtr hdc = GetDC(IntPtr.Zero);
                int dpiX = GetDeviceCaps(hdc, LOGPIXELSX);
                int dpiY = GetDeviceCaps(hdc, LOGPIXELSY);
                ReleaseDC(IntPtr.Zero, hdc);
                return new Point(dpiX, dpiY);
            }
        }

        /// <summary)
        /// 获取真实设置的桌面分辨率大小
        /// </summary)
        public static Size Desktop
        {
            get
            {
                IntPtr hdc = GetDC(IntPtr.Zero);
                Size size = new Size
                {
                    Width = GetDeviceCaps(hdc, DESKTOPHORZRES),
                    Height = GetDeviceCaps(hdc, DESKTOPVERTRES)
                };
                ReleaseDC(IntPtr.Zero, hdc);
                return size;
            }
        }

        /// <summary>
        /// 获取宽度缩放百分比
        /// </summary>
        public static float ScaleX
        {
            get
            {
                IntPtr hdc = GetDC(IntPtr.Zero);
                int t = GetDeviceCaps(hdc, DESKTOPHORZRES);
                int d = GetDeviceCaps(hdc, HORZRES);
                ReleaseDC(IntPtr.Zero, hdc);
                return (float)t / d;
            }
        }

        /// <summary>
        /// 获取高度缩放百分比
        /// </summary>
        public static float ScaleY
        {
            get
            {
                IntPtr hdc = GetDC(IntPtr.Zero);
                int t = GetDeviceCaps(hdc, DESKTOPVERTRES);
                int d = GetDeviceCaps(hdc, VERTRES);
                ReleaseDC(IntPtr.Zero, hdc);
                return (float)t / d;
            }
        }

        /// <summary>
        /// 当前系统DPI_XY 大小 一般为96
        /// </summary>
        public static PointF Scale
        {
            get
            {
                IntPtr hdc = GetDC(IntPtr.Zero);
                int t1 = GetDeviceCaps(hdc, DESKTOPHORZRES);
                int d1 = GetDeviceCaps(hdc, HORZRES);
                int t2 = GetDeviceCaps(hdc, DESKTOPVERTRES);
                int d2 = GetDeviceCaps(hdc, VERTRES);
                ReleaseDC(IntPtr.Zero, hdc);
                return new PointF((float)t1 / d1, (float)t2 / d2);
            }
        }

        public static Rectangle ToScale(Rectangle rect)
        {
            IntPtr hdc = GetDC(IntPtr.Zero);
            int t1 = GetDeviceCaps(hdc, DESKTOPHORZRES);
            int d1 = GetDeviceCaps(hdc, HORZRES);
            int t2 = GetDeviceCaps(hdc, DESKTOPVERTRES);
            int d2 = GetDeviceCaps(hdc, VERTRES);

            if (t1 != d1)
            {
                float sx = (float)t1 / d1;
                rect.X = (int)(rect.X * sx);
                rect.Width = (int)(rect.Width * sx);
            }
            if (t2 != d2)
            {
                float sy = (float)t2 / d2;
                rect.Y = (int)(rect.Y * sy);
                rect.Height = (int)(rect.Height * sy);
            }

            return rect;
        }

        public static RectangleF ToScale(RectangleF rect)
        {
            IntPtr hdc = GetDC(IntPtr.Zero);
            int t1 = GetDeviceCaps(hdc, DESKTOPHORZRES);
            int d1 = GetDeviceCaps(hdc, HORZRES);
            int t2 = GetDeviceCaps(hdc, DESKTOPVERTRES);
            int d2 = GetDeviceCaps(hdc, VERTRES);

            if (t1 != d1)
            {
                float sx = (float)t1 / d1;
                rect.X *= sx;
                rect.Width *= sx;
            }
            if (t2 != d2)
            {
                float sy = (float)t2 / d2;
                rect.Y *= sy;
                rect.Height *= sy;
            }

            return rect;
        }

        /// <summary>
        /// 多屏
        /// </summary>
        /// <param name="ctl"></param>
        /// <param name="rect"></param>
        /// <returns></returns>
        public static Rectangle ToScale2(Control ctl, Rectangle rect)
        {
            Screen cs = Screen.FromControl(ctl);
            //Rectangle rw = cs.WorkingArea;
            //Rectangle bb = cs.Bounds;

            DEVMODE dm = new DEVMODE
            {
                dmSize = (short)Marshal.SizeOf(typeof(DEVMODE))
            };
            EnumDisplaySettings(cs.DeviceName, ENUM_CURRENT_SETTINGS, ref dm);

            int t1 = dm.dmPelsWidth;
            int d1 = cs.Bounds.Width;
            int t2 = dm.dmPelsHeight;
            int d2 = cs.Bounds.Height;

            /*
            IntPtr hdc = GetDC(ctl.Handle);
            int t1 = GetDeviceCaps(hdc, DESKTOPHORZRES);
            int d1 = GetDeviceCaps(hdc, HORZRES);
            int t2 = GetDeviceCaps(hdc, DESKTOPVERTRES);
            int d2 = GetDeviceCaps(hdc, VERTRES);
            */

            if (t1 != d1)
            {
                float sx = (float)t1 / d1;
                rect.X = (int)(rect.X * sx);
                rect.Width = (int)(rect.Width * sx);
            }
            if (t2 != d2)
            {
                float sy = (float)t2 / d2;
                rect.Y = (int)(rect.Y * sy);
                rect.Height = (int)(rect.Height * sy);
            }

            return rect;
        }

        const int ENUM_CURRENT_SETTINGS = -1;
        [DllImport("user32.dll")]
        public static extern bool EnumDisplaySettings(string lpszDeviceName, int iModeNum, ref DEVMODE lpDevMode);

        [StructLayout(LayoutKind.Sequential)]
        public struct DEVMODE
        {
            private const int CCHDEVICENAME = 0x20;
            private const int CCHFORMNAME = 0x20;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 0x20)]
            public string dmDeviceName;
            public short dmSpecVersion;
            public short dmDriverVersion;
            public short dmSize;
            public short dmDriverExtra;
            public int dmFields;
            public int dmPositionX;
            public int dmPositionY;
            public ScreenOrientation dmDisplayOrientation;
            public int dmDisplayFixedOutput;
            public short dmColor;
            public short dmDuplex;
            public short dmYResolution;
            public short dmTTOption;
            public short dmCollate;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 0x20)]
            public string dmFormName;
            public short dmLogPixels;
            public int dmBitsPerPel;
            public int dmPelsWidth;
            public int dmPelsHeight;
            public int dmDisplayFlags;
            public int dmDisplayFrequency;
            public int dmICMMethod;
            public int dmICMIntent;
            public int dmMediaType;
            public int dmDitherType;
            public int dmReserved1;
            public int dmReserved2;
            public int dmPanningWidth;
            public int dmPanningHeight;
        }
    }
}