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

namespace Karna.Magnification
{
    // Magnifier Window Styles
    internal enum MagnifierStyle : int
    {
        MS_SHOWMAGNIFIEDCURSOR = 0x0001,
        MS_CLIPAROUNDCURSOR = 0x0002,
        MS_INVERTCOLORS = 0x0004
    }

    // Filter Modes
    internal enum FilterMode
    {
        MW_FILTERMODE_EXCLUDE = 0,
        MW_FILTERMODE_INCLUDE = 1
    }

    [StructLayout(LayoutKind.Sequential)]
    internal struct Transformation
    {
        public float m00;
        public float m10;
        public float m20;
        public float m01;
        public float m11;
        public float m21;
        public float m02;
        public float m12;
        public float m22;

        public Transformation(float magnificationFactor)
            : this()
        {
            m00 = magnificationFactor;
            m11 = magnificationFactor;
            m22 = 1.0f;
        }
    }

    [StructLayout(LayoutKind.Sequential)]
    internal struct ColorEffect
    {
        public float transform00;
        public float transform10;
        public float transform20;
        public float transform30;
        public float transform40;
        public float transform01;
        public float transform02;
        public float transform03;
        public float transform04;
        public float transform11;
        public float transform12;
        public float transform13;
        public float transform14;
        public float transform21;
        public float transform22;
        public float transform23;
        public float transform24;
        public float transform31;
        public float transform32;
        public float transform33;
        public float transform34;
        public float transform41;
        public float transform42;
        public float transform43;
        public float transform44;
    }

    /// <summary>
    /// A Wrapper for a POINT struct
    /// </summary>
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "POINT"), System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1034:NestedTypesShouldNotBeVisible")]
    [StructLayout(LayoutKind.Sequential)]
    internal struct POINT
    {
        /// <summary>
        /// The X coordinate of the point
        /// </summary>
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly", MessageId = "X")]
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1051:DoNotDeclareVisibleInstanceFields")]
        public int x;

        /// <summary>
        /// The Y coordinate of the point
        /// </summary>
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly", MessageId = "Y")]
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1051:DoNotDeclareVisibleInstanceFields")]
        public int y;

        /// <summary>
        /// Initialize the point
        /// </summary>
        /// <param name="x">The x coordinate of the point.</param>
        /// <param name="y">The y coordinate of the point.</param>
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly", MessageId = "y"), System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly", MessageId = "x")]
        public POINT(int x, int y)
        {
            this.x = x;
            this.y = y;
        }
    }

    /// <summary>
    /// A Wrapper for a RECT struct
    /// </summary>
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "RECT"), System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1034:NestedTypesShouldNotBeVisible")]
    [StructLayout(LayoutKind.Sequential)]
    internal struct RECT
    {
        /// <summary>
        /// Position of left edge
        /// </summary>
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1051:DoNotDeclareVisibleInstanceFields")]
        public int left;

        /// <summary>
        /// Position of top edge
        /// </summary>
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1051:DoNotDeclareVisibleInstanceFields")]
        public int top;

        /// <summary>
        /// Position of right edge
        /// </summary>
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1051:DoNotDeclareVisibleInstanceFields")]
        public int right;

        /// <summary>
        /// Position of bottom edge
        /// </summary>
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1051:DoNotDeclareVisibleInstanceFields")]
        public int bottom;

        public RECT(int left, int top, int right, int bottom)
        {
            this.left = left;
            this.right = right;
            this.top = top;
            this.bottom = bottom;
        }

        public RECT(int width, int height)
        {
            this.left = 0;
            this.top = 0;
            this.right = width;
            this.bottom = height;
        }

        public override bool Equals(object obj)
        {
            RECT r = (RECT)obj;
            return (r.left == left && r.right == right && r.top == top && r.bottom == bottom);
        }

        public override int GetHashCode()
        {
            // Attempting a minor degree of "hash-ness" here
            return ((left ^ top) ^ right) ^ bottom;
        }

        public static bool operator ==(RECT a, RECT b)
        {
            return (a.left == b.left && a.right == b.right && a.top == b.top && a.bottom == b.bottom);
        }

        public static bool operator !=(RECT a, RECT b)
        {
            return !(a == b);
        }

    }

    /// <summary>
    /// Specifies the style of the window being created
    /// </summary>
    [FlagsAttribute]
    [Description("Specifies the style of the window being created")]
    internal enum WindowStyles : int
    {
        /// <summary>
        /// Creates an overlapped window. An overlapped window has a title bar and a border 
        /// </summary>
        WS_OVERLAPPED = 0x00000000,
        /// <summary>
        /// Creates a pop-up window
        /// </summary>
        WS_POPUP = -2147483648,
        /// <summary>
        /// Creates a child window. A window with this style cannot have a menu bar. 
        /// This style cannot be used with the WS_POPUP style.
        /// </summary>
        WS_CHILD = 0x40000000,
        /// <summary>
        /// Creates a window that is initially minimized. 
        /// Same as the WS_ICONIC style.
        /// </summary>
        WS_MINIMIZE = 0x20000000,
        /// <summary>
        /// Creates a window that is initially visible.
        /// </summary>
        WS_VISIBLE = 0x10000000,
        /// <summary>
        /// Creates a window that is initially disabled. 
        /// A disabled window cannot receive input from the user
        /// </summary>
        WS_DISABLED = 0x08000000,
        /// <summary>
        /// Clips child windows relative to each other; that is, when a particular child window 
        /// receives a WM_PAINT message, the WS_CLIPSIBLINGS style clips all other overlapping 
        /// child windows out of the region of the child window to be updated. 
        /// If WS_CLIPSIBLINGS is not specified and child windows overlap, it is possible, 
        /// when drawing within the client area of a child window, to draw within the client area 
        /// of a neighboring child window.
        /// </summary>
        WS_CLIPSIBLINGS = 0x04000000,
        /// <summary>
        /// Excludes the area occupied by child windows when drawing occurs within the parent window. 
        /// This style is used when creating the parent window.
        /// </summary>
        WS_CLIPCHILDREN = 0x02000000,
        /// <summary>
        /// Creates a window that is initially maximized.
        /// </summary>
        WS_MAXIMIZE = 0x01000000,
        /// <summary>
        /// Creates a window that has a title bar (includes the WS_BORDER style).
        /// </summary>
        WS_CAPTION = 0x00C00000,
        /// <summary>
        /// Creates a window that has a thin-line border.
        /// </summary>
        WS_BORDER = 0x00800000,
        /// <summary>
        /// Creates a window that has a border of a style typically used with dialog boxes. 
        /// A window with this style cannot have a title bar.
        /// </summary>
        WS_DLGFRAME = 0x00400000,
        /// <summary>
        /// Creates a window that has a vertical scroll bar.
        /// </summary>
        WS_VSCROLL = 0x00200000,
        /// <summary>
        /// Creates a window that has a horizontal scroll bar.
        /// </summary>
        WS_HSCROLL = 0x00100000,
        /// <summary>
        /// Creates a window that has a window menu on its title bar. 
        /// The WS_CAPTION style must also be specified.
        /// </summary>
        WS_SYSMENU = 0x00080000,
        /// <summary>
        /// Creates a window that has a sizing border. 
        /// Same as the WS_SIZEBOX style.
        /// </summary>
        WS_THICKFRAME = 0x00040000,
        /// <summary>
        /// Specifies the first control of a group of controls. 
        /// The group consists of this first control and all controls defined after it, 
        /// up to the next control with the WS_GROUP style. The first control in each group 
        /// usually has the WS_TABSTOP style so that the user can move from group to group. 
        /// The user can subsequently change the keyboard focus from one control in the group 
        /// to the next control in the group by using the direction keys.
        /// </summary>
        WS_GROUP = 0x00020000,
        /// <summary>
        /// Specifies a control that can receive the keyboard focus when the user presses the TAB key. 
        /// Pressing the TAB key changes the keyboard focus to the next control with the 
        /// WS_TABSTOP style. 
        /// </summary>
        WS_TABSTOP = 0x00010000,
        /// <summary>
        /// Creates a window that has a minimize button. Cannot be combined with the WS_EX_CONTEXTHELP 
        /// style. The WS_SYSMENU style must also be specified. 
        /// </summary>
        WS_MINIMIZEBOX = 0x00020000,
        /// <summary>
        /// Creates a window that has a maximize button. Cannot be combined with the 
        /// WS_EX_CONTEXTHELP style. The WS_SYSMENU style must also be specified. 
        /// </summary>
        WS_MAXIMIZEBOX = 0x00010000
    }

    /// <summary>
    ///Common window styles
    /// </summary>
    [Description("Common window styles")]
    internal enum CommonWindowStyles : int
    {
        /// <summary>
        ///Creates an overlapped window. An overlapped window has a title bar and a border. Same as the WS_OVERLAPPED style. 
        /// </summary>
        WS_TILED = WindowStyles.WS_OVERLAPPED,
        /// <summary>
        ///Creates a window that is initially minimized. Same as the WS_MINIMIZE style.
        /// </summary>
        WS_ICONIC = WindowStyles.WS_MINIMIZE,
        /// <summary>
        ///Creates a window that has a sizing border. Same as the WS_THICKFRAME style.
        /// </summary>
        WS_SIZEBOX = WindowStyles.WS_THICKFRAME,
        /// <summary>
        /// Creates an overlapped window with the WS_OVERLAPPED, WS_CAPTION, WS_SYSMENU, WS_THICKFRAME, WS_MINIMIZEBOX, and WS_MAXIMIZEBOX styles. Same as the WS_TILEDWINDOW style. 
        /// </summary>
        WS_OVERLAPPEDWINDOW = (WindowStyles.WS_OVERLAPPED | WindowStyles.WS_CAPTION | WindowStyles.WS_SYSMENU | WindowStyles.WS_THICKFRAME | WindowStyles.WS_MINIMIZEBOX | WindowStyles.WS_MAXIMIZEBOX),
        /// <summary>
        ///Creates an overlapped window with the WS_OVERLAPPED, WS_CAPTION, WS_SYSMENU, WS_THICKFRAME, WS_MINIMIZEBOX, and WS_MAXIMIZEBOX styles. Same as the WS_OVERLAPPEDWINDOW style.  
        /// </summary>
        WS_TILEDWINDOW = WS_OVERLAPPEDWINDOW,
        /// <summary>
        ///Creates a pop-up window with WS_BORDER, WS_POPUP, and WS_SYSMENU styles. The WS_CAPTION and WS_POPUPWINDOW styles must be combined to make the window menu visible.
        /// </summary>
        WS_POPUPWINDOW = (WindowStyles.WS_POPUP |
                          WindowStyles.WS_BORDER |
                          WindowStyles.WS_SYSMENU),
        /// <summary>
        ///Same as the WS_CHILD style.
        /// </summary>
        WS_CHILDWINDOW = (WindowStyles.WS_CHILD)
    }

    [FlagsAttribute]
    internal enum SetWindowPosFlags : int
    {
        SWP_NOSIZE = 1,
        SWP_NOMOVE = 2,
        SWP_NOZORDER = 4,
        SWP_NOREDRAW = 8,
        SWP_NOACTIVATE = 0x10,
        SWP_FRAMECHANGED = 0x20,
        SWP_SHOWWINDOW = 0x40,
        SWP_HIDEWINDOW = 0x80,
        SWP_NOCOPYBITS = 0x100,
        SWP_NOOWNERZORDER = 0x200,
        SWP_NOSENDCHANGING = 0x400
    }

    /// <summary>
    /// Specifies the extended style of the window
    /// </summary>
    [FlagsAttribute]
    [Description("Specifies the extended style of the window")]
    internal enum ExtendedWindowStyles : int
    {
        /// <summary>
        /// Creates a window that has a double border; the window can, optionally, 
        /// be created with a title bar by specifying the WS_CAPTION style in the dwStyle parameter.
        /// </summary>
        WS_EX_DLGMODALFRAME = 0x00000001,
        /// <summary>
        /// Specifies that a child window created with this style does not send 
        /// the WM_PARENTNOTIFY message to its parent window when it is created or destroyed.
        /// </summary>
        WS_EX_NOPARENTNOTIFY = 0x00000004,
        /// <summary>
        /// Specifies that a window created with this style should be placed above all nontopmost 
        /// windows and stay above them even when the window is deactivated
        /// </summary>
        WS_EX_TOPMOST = 0x00000008,
        /// <summary>
        /// Windows that can accept dragged objects must be created with this style so that 
        /// Windows can determine that the window will accept objects and can change the drag/drop 
        /// cursor as the user drags an object over the window. 
        /// </summary>
        WS_EX_ACCEPTFILES = 0x00000010,
        /// <summary>
        /// The WS_EX_TRANSPARENT style makes a window transparent; that is, the window can be seen through, 
        /// and anything under the window is still visible. Transparent windows are not transparent 
        /// to mouse or keyboard events. A transparent window receives paint messages when anything 
        /// under it changes. Transparent windows are useful for drawing drag handles on top of other 
        /// windows or for implementing "hot-spot" areas without having to hit test because the transparent 
        /// window receives click messages. 
        /// </summary>
        WS_EX_TRANSPARENT = 0x00000020,
        /// <summary>
        /// Creates an MDI child window. 
        /// </summary>
        WS_EX_MDICHILD = 0x00000040,
        /// <summary>
        /// Creates a tool window, which is a window intended to be used as a floating toolbar. 
        /// A tool window has a title bar that is shorter than a normal title bar, and the window title 
        /// is drawn using a smaller font. A tool window does not appear in the task bar or in the window 
        /// that appears when the user presses ALT+TAB. 
        /// </summary>
        WS_EX_TOOLWINDOW = 0x00000080,
        /// <summary>
        /// Specifies that a window has a border with a raised edge. 
        /// </summary>
        WS_EX_WINDOWEDGE = 0x00000100,
        /// <summary>
        ///  Specifies that a window has a 3D look — that is, a border with a sunken edge. 
        /// </summary>
        WS_EX_CLIENTEDGE = 0x00000200,
        /// <summary>
        /// Includes a question mark in the title bar of the window. 
        /// When the user clicks the question mark, the cursor changes to a question mark with a pointer. 
        /// If the user then clicks a child window, the child receives a WM_HELP message. 
        /// </summary>
        WS_EX_CONTEXTHELP = 0x00000400,
        /// <summary>
        /// Gives a window generic right-aligned properties. This depends on the window class. 
        /// </summary>
        WS_EX_RIGHT = 0x00001000,
        /// <summary>
        /// Gives window generic left-aligned properties. This is the default. 
        /// </summary>
        WS_EX_LEFT = 0x00000000,
        /// <summary>
        /// Displays the window text using right-to-left reading order properties. 
        /// </summary>
        WS_EX_RTLREADING = 0x00002000,
        /// <summary>
        /// Displays the window text using left-to-right reading order properties. This is the default. 
        /// </summary>
        WS_EX_LTRREADING = 0x00000000,
        /// <summary>
        /// Places a vertical scroll bar to the left of the client area. 
        /// </summary>
        WS_EX_LEFTSCROLLBAR = 0x00004000,
        /// <summary>
        /// Places a vertical scroll bar (if present) to the right of the client area. This is the default. 
        /// </summary>
        WS_EX_RIGHTSCROLLBAR = 0x00000000,
        /// <summary>
        /// Allows the user to navigate among the child windows of the window by using the TAB key. 
        /// </summary>
        WS_EX_CONTROLPARENT = 0x00010000,
        /// <summary>
        /// Creates a window with a three-dimensional border style intended to be used for items that 
        /// do not accept user input. 
        /// </summary>
        WS_EX_STATICEDGE = 0x00020000,
        /// <summary>
        /// Forces a top-level window onto the taskbar when the window is visible. 
        /// </summary>
        WS_EX_APPWINDOW = 0x00040000,
        /// <summary>
        /// Creates a layered window. Note that this cannot be used for child windows
        /// </summary>
        WS_EX_LAYERED = 0x00080000,
        /// <summary>
        /// A window created with this style does not pass its window layout to its child windows.
        /// </summary>
        WS_EX_NOINHERITLAYOUT = 0x00100000,
        /// <summary>
        /// Creates a window whose horizontal origin is on the right edge. 
        /// Increasing horizontal values advance to the left. 
        /// </summary>
        WS_EX_LAYOUTRTL = 0x00400000,
        /// <summary>
        /// Paints all descendants of a window in bottom-to-top painting order using double-buffering. 
        /// </summary>
        WS_EX_COMPOSITED = 0x02000000,
        /// <summary>
        /// A top-level window created with this style does not become the foreground window when the user 
        /// clicks it. The system does not bring this window to the foreground when the user minimizes 
        /// or closes the foreground window. 
        /// </summary>
        WS_EX_NOACTIVATE = 0x08000000
    }

    /// <summary>
    /// Common extended window styles
    /// </summary>
    [Description("Common extended window styles")]
    internal enum CommonExtendedWindowStyles : int
    {
        /// <summary>
        /// Combines the WS_EX_CLIENTEDGE and WS_EX_WINDOWEDGE styles.
        /// </summary>
        WS_EX_OVERLAPPEDWINDOW = (ExtendedWindowStyles.WS_EX_WINDOWEDGE |
                                  ExtendedWindowStyles.WS_EX_CLIENTEDGE),
        /// <summary>
        /// Combines the WS_EX_WINDOWEDGE, WS_EX_TOOLWINDOW, and WS_EX_TOPMOST styles.
        /// </summary>
        WS_EX_PALETTEWINDOW = (ExtendedWindowStyles.WS_EX_WINDOWEDGE |
                                  ExtendedWindowStyles.WS_EX_TOOLWINDOW |
                                  ExtendedWindowStyles.WS_EX_TOPMOST)
    }

    /// <summary>
    /// Layered window flags
    /// </summary>
    [FlagsAttribute]
    [Description("Layered window flags")]
    internal enum LayeredWindowAttributeFlags : int
    {
        /// <summary>
        /// Use key as a transparency color
        /// </summary>
        LWA_COLORKEY = 0x00000001,
        /// <summary>
        /// Use Alpha to determine the opacity of the layered window.
        /// </summary>
        LWA_ALPHA = 0x00000002
    }


    [FlagsAttribute]
    internal enum LayeredWindowUpdateFlags : int
    {
        ULW_COLORKEY = 0x00000001,
        ULW_ALPHA = 0x00000002,
        ULW_OPAQUE = 0x00000004
    }

    [FlagsAttribute]
    internal enum BlendOperations : byte
    {
        AC_SRC_OVER = 0x00,
        AC_SRC_ALPHA = 0x01
    }

    internal enum ShowWindowStyles : short
    {
        SW_HIDE = 0,
        SW_SHOWNORMAL = 1,
        SW_NORMAL = 1,
        SW_SHOWMINIMIZED = 2,
        SW_SHOWMAXIMIZED = 3,
        SW_MAXIMIZE = 3,
        SW_SHOWNOACTIVATE = 4,
        SW_SHOW = 5,
        SW_MINIMIZE = 6,
        SW_SHOWMINNOACTIVE = 7,
        SW_SHOWNA = 8,
        SW_RESTORE = 9,
        SW_SHOWDEFAULT = 10,
        SW_FORCEMINIMIZE = 11,
        SW_MAX = 11
    }

    internal enum WindowMessage : int
    {
        WM_CREATE = 0x0001,
        WM_DESTROY = 0x0002,
        WM_PAINT = 0x000F,
        WM_CLOSE = 0x0010,
        WM_QUERYENDSESSION = 0x0011,
        WM_QUIT = 0x0012,
        WM_ENDSESSION = 0x0016,
        WM_SETCURSOR = 0x0020,
        WM_MOVE = 0x0003,
        WM_SIZE = 0x0005,
        WM_MOUSEMOVE = 0x0200,
        WM_NCMOUSEMOVE = 0x00A0,
        WM_KEYDOWN = 0x0100,
        WM_SYSKEYDOWN = 0x0104,
        WM_KEYUP = 0x0101,
        WM_CHAR = 0x0102,
        WM_SYSCHAR = 0x0106,
        WM_LBUTTONDOWN = 0x0201,
        WM_LBUTTONUP = 0x0202,
        WM_LBUTTONDBLCLK = 0x0203,
        WM_RBUTTONDOWN = 0x0204,
        WM_RBUTTONUP = 0x0205,
        WM_RBUTTONDBLCLK = 0x0206,
        WM_MBUTTONDOWN = 0x0207,
        WM_MBUTTONUP = 0x0208,
        WM_MBUTTONDBLCLK = 0x0209,
        WM_MOUSEWHEEL = 0x020A,
        WM_MOUSEHOVER = 0x02A1,
        WM_MOUSELEAVE = 0x02A3,
        WM_NCLBUTTONDOWN = 0x00A1,
        WM_NCLBUTTONUP = 0x00A2,
        WM_NCLBUTTONDBLCLK = 0x00A3,
        WM_NCRBUTTONDOWN = 0x00A4,
        WM_NCRBUTTONUP = 0x00A5,
        WM_NCRBUTTONDBLCLK = 0x00A6,
        WM_NCMBUTTONDOWN = 0x00A7,
        WM_NCMBUTTONUP = 0x00A8,
        WM_NCMBUTTONDBLCLK = 0x00A9,
        WM_NCXBUTTONDOWN = 0x00AB,
        WM_NCXBUTTONUP = 0x00AC,
        WM_GETDLGCODE = 0x0087,
        WM_NCHITTEST = 0x0084,
        WM_WINDOWPOSCHANGING = 0x0046,
        WM_WINDOWPOSCHANGED = 0x0047,
        WM_KILLTIMER = 0x402,
        WM_TIMER = 0x113,
        WM_NCPAINT = 0x85,
        WM_ERASEBKGND = 20,
        WM_DROPFILES = 0x233,
        WM_MOUSEACTIVATE = 0x0021,
        WM_ACTIVATE = 0x0006,
        WM_ACTIVATEAPP = 0x001C,
        WM_KILLFOCUS = 8
    }

}