using System.Runtime.InteropServices;

namespace BinaryObjectScanner.Models.PortableExecutable
{
    /// <summary>
    /// Defines the dimensions and style of a dialog box. This structure, always the first
    /// in a standard template for a dialog box, also specifies the number of controls in
    /// the dialog box and therefore specifies the number of subsequent DLGITEMTEMPLATE
    /// structures in the template.
    /// </summary>
    /// <see href="https://learn.microsoft.com/en-us/windows/win32/api/winuser/ns-winuser-dlgtemplate"/>
    [StructLayout(LayoutKind.Sequential)]
    public sealed class DialogTemplate
    {
        /// <summary>
        /// The style of the dialog box. This member can be a combination of window style
        /// values (such as WS_CAPTION and WS_SYSMENU) and dialog box style values (such
        /// as DS_CENTER).
        /// 
        /// If the style member includes the DS_SETFONT style, the header of the dialog box
        /// template contains additional data specifying the font to use for text in the
        /// client area and controls of the dialog box. The font data begins on the WORD
        /// boundary that follows the title array. The font data specifies a 16-bit point
        /// size value and a Unicode font name string. If possible, the system creates a
        /// font according to the specified values. Then the system sends a WM_SETFONT
        /// message to the dialog box and to each control to provide a handle to the font.
        /// If DS_SETFONT is not specified, the dialog box template does not include the
        /// font data.
        /// 
        /// The DS_SHELLFONT style is not supported in the DLGTEMPLATE header.
        /// </summary>
        public WindowStyles Style;

        /// <summary>
        /// The extended styles for a window. This member is not used to create dialog boxes,
        /// but applications that use dialog box templates can use it to create other types
        /// of windows.
        /// </summary>
        public ExtendedWindowStyles ExtendedStyle;

        /// <summary>
        /// The number of items in the dialog box.
        /// </summary>
        public ushort ItemCount;

        /// <summary>
        /// The x-coordinate, in dialog box units, of the upper-left corner of the dialog box.
        /// </summary>
        /// <remarks>
        /// The x, y, cx, and cy members specify values in dialog box units. You can convert these values
        /// to screen units (pixels) by using the MapDialogRect function.
        /// </remarks>
        public short PositionX;

        /// <summary>
        /// The y-coordinate, in dialog box units, of the upper-left corner of the dialog box.
        /// </summary>
        /// <remarks>
        /// The x, y, cx, and cy members specify values in dialog box units. You can convert these values
        /// to screen units (pixels) by using the MapDialogRect function.
        /// </remarks>
        public short PositionY;

        /// <summary>
        /// The width, in dialog box units, of the dialog box.
        /// </summary>
        /// <remarks>
        /// The x, y, cx, and cy members specify values in dialog box units. You can convert these values
        /// to screen units (pixels) by using the MapDialogRect function.
        /// </remarks>
        public short WidthX;

        /// <summary>
        /// The height, in dialog box units, of the dialog box.
        /// </summary>
        /// <remarks>
        /// The x, y, cx, and cy members specify values in dialog box units. You can convert these values
        /// to screen units (pixels) by using the MapDialogRect function.
        /// </remarks>
        public short HeightY;

        // In a standard template for a dialog box, the DLGTEMPLATE structure is always immediately
        // followed by three variable-length arrays that specify the menu, class, and title for the
        // dialog box. When the DS_SETFONT style is specified, these arrays are also followed by a
        // 16-bit value specifying point size and another variable-length array specifying a
        // typeface name. Each array consists of one or more 16-bit elements. The menu, class, title,
        // and font arrays must be aligned on WORD boundaries.

        /// <summary>
        /// Immediately following the DLGTEMPLATE structure is a menu array that identifies a menu
        /// resource for the dialog box. If the first element of this array is 0x0000, the dialog box
        /// has no menu and the array has no other elements. If the first element is 0xFFFF, the array
        /// has one additional element that specifies the ordinal value of a menu resource in an
        /// executable file. If the first element has any other value, the system treats the array as
        /// a null-terminated Unicode string that specifies the name of a menu resource in an executable
        /// file.
        /// </summary>
        /// <remarks>
        /// If you specify character strings in the menu, class, title, or typeface arrays, you must use
        /// Unicode strings.
        /// </remarks>
        public string MenuResource;

        /// <summary>
        /// The ordinal value of a menu resource in an executable file.
        /// </summary>
        public ushort MenuResourceOrdinal;

        /// <summary>
        /// Following the menu array is a class array that identifies the window class of the dialog box.
        /// If the first element of the array is 0x0000, the system uses the predefined dialog box class
        /// for the dialog box and the array has no other elements. If the first element is 0xFFFF,
        /// the array has one additional element that specifies the ordinal value of a predefined system
        /// window class. If the first element has any other value, the system treats the array as a
        /// null-terminated Unicode string that specifies the name of a registered window class.
        /// </summary>
        /// <remarks>
        /// If you specify character strings in the menu, class, title, or typeface arrays, you must use
        /// Unicode strings.
        /// </remarks>
        public string ClassResource;

        /// <summary>
        /// The ordinal value of a predefined system class.
        /// </summary>
        public ushort ClassResourceOrdinal;

        /// <summary>
        /// Following the class array is a title array that specifies a null-terminated Unicode string
        /// that contains the title of the dialog box. If the first element of this array is 0x0000,
        /// the dialog box has no title and the array has no other elements.
        /// </summary>
        /// <remarks>
        /// If you specify character strings in the menu, class, title, or typeface arrays, you must use
        /// Unicode strings.
        /// </remarks>
        public string TitleResource;

        /// <summary>
        /// The 16-bit point size value and the typeface array follow the title array, but only if the
        /// style member specifies the DS_SETFONT style. The point size value specifies the point size
        /// of the font to use for the text in the dialog box and its controls. When these values are
        /// specified, the system creates a font having the specified size and typeface (if possible)
        /// and sends a WM_SETFONT message to the dialog box procedure and the control window
        /// procedures as it creates the dialog box and controls.
        /// </summary>
        public ushort PointSizeValue;

        /// <summary>
        /// The 16-bit point size value and the typeface array follow the title array, but only if the
        /// style member specifies the DS_SETFONT style. The typeface array is a null-terminated Unicode
        /// string specifying the name of the typeface for the font. When these values are specified,
        /// the system creates a font having the specified size and typeface (if possible) and sends a
        /// WM_SETFONT message to the dialog box procedure and the control window procedures as it
        /// creates the dialog box and controls.
        /// </summary>
        /// <remarks>
        /// If you specify character strings in the menu, class, title, or typeface arrays, you must use
        /// Unicode strings.
        /// </remarks>
        public string Typeface;
    }
}