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

namespace Capture
{
    [System.Security.SuppressUnmanagedCodeSecurity()]
    internal sealed class NativeMethods
    {
        private NativeMethods() { }

        internal static bool IsWindowInForeground(IntPtr hWnd)
        {
            return hWnd == GetForegroundWindow();
        }

        #region kernel32
        
        [DllImport("kernel32.dll")]
        public static extern IntPtr GetModuleHandle(string lpModuleName);

        #endregion

        #region user32

        #region ShowWindow
        /// <summary>Shows a Window</summary>
        /// <remarks>
        /// <para>To perform certain special effects when showing or hiding a
        /// window, use AnimateWindow.</para>
        ///<para>The first time an application calls ShowWindow, it should use
        ///the WinMain function's nCmdShow parameter as its nCmdShow parameter.
        ///Subsequent calls to ShowWindow must use one of the values in the
        ///given list, instead of the one specified by the WinMain function's
        ///nCmdShow parameter.</para>
        ///<para>As noted in the discussion of the nCmdShow parameter, the
        ///nCmdShow value is ignored in the first call to ShowWindow if the
        ///program that launched the application specifies startup information
        ///in the structure. In this case, ShowWindow uses the information
        ///specified in the STARTUPINFO structure to show the window. On
        ///subsequent calls, the application must call ShowWindow with nCmdShow
        ///set to SW_SHOWDEFAULT to use the startup information provided by the
        ///program that launched the application. This behavior is designed for
        ///the following situations: </para>
        ///<list type="">
        ///    <item>Applications create their main window by calling CreateWindow
        ///    with the WS_VISIBLE flag set. </item>
        ///    <item>Applications create their main window by calling CreateWindow
        ///    with the WS_VISIBLE flag cleared, and later call ShowWindow with the
        ///    SW_SHOW flag set to make it visible.</item>
        ///</list></remarks>
        /// <param name="hWnd">Handle to the window.</param>
        /// <param name="nCmdShow">Specifies how the window is to be shown.
        /// This parameter is ignored the first time an application calls
        /// ShowWindow, if the program that launched the application provides a
        /// STARTUPINFO structure. Otherwise, the first time ShowWindow is called,
        /// the value should be the value obtained by the WinMain function in its
        /// nCmdShow parameter. In subsequent calls, this parameter can be one of
        /// the WindowShowStyle members.</param>
        /// <returns>
        /// If the window was previously visible, the return value is nonzero.
        /// If the window was previously hidden, the return value is zero.
        /// </returns>
        [DllImport("user32.dll")]
        internal static extern bool ShowWindow(IntPtr hWnd, WindowShowStyle nCmdShow);

        /// <summary>Enumeration of the different ways of showing a window using
        /// ShowWindow</summary>
        internal enum WindowShowStyle : uint
        {
            /// <summary>Hides the window and activates another window.</summary>
            /// <remarks>See SW_HIDE</remarks>
            Hide = 0,
            /// <summary>Activates and displays a window. If the window is minimized
            /// or maximized, the system restores it to its original size and
            /// position. An application should specify this flag when displaying
            /// the window for the first time.</summary>
            /// <remarks>See SW_SHOWNORMAL</remarks>
            ShowNormal = 1,
            /// <summary>Activates the window and displays it as a minimized window.</summary>
            /// <remarks>See SW_SHOWMINIMIZED</remarks>
            ShowMinimized = 2,
            /// <summary>Activates the window and displays it as a maximized window.</summary>
            /// <remarks>See SW_SHOWMAXIMIZED</remarks>
            ShowMaximized = 3,
            /// <summary>Maximizes the specified window.</summary>
            /// <remarks>See SW_MAXIMIZE</remarks>
            Maximize = 3,
            /// <summary>Displays a window in its most recent size and position.
            /// This value is similar to "ShowNormal", except the window is not
            /// actived.</summary>
            /// <remarks>See SW_SHOWNOACTIVATE</remarks>
            ShowNormalNoActivate = 4,
            /// <summary>Activates the window and displays it in its current size
            /// and position.</summary>
            /// <remarks>See SW_SHOW</remarks>
            Show = 5,
            /// <summary>Minimizes the specified window and activates the next
            /// top-level window in the Z order.</summary>
            /// <remarks>See SW_MINIMIZE</remarks>
            Minimize = 6,
            /// <summary>Displays the window as a minimized window. This value is
            /// similar to "ShowMinimized", except the window is not activated.</summary>
            /// <remarks>See SW_SHOWMINNOACTIVE</remarks>
            ShowMinNoActivate = 7,
            /// <summary>Displays the window in its current size and position. This
            /// value is similar to "Show", except the window is not activated.</summary>
            /// <remarks>See SW_SHOWNA</remarks>
            ShowNoActivate = 8,
            /// <summary>Activates and displays the window. If the window is
            /// minimized or maximized, the system restores it to its original size
            /// and position. An application should specify this flag when restoring
            /// a minimized window.</summary>
            /// <remarks>See SW_RESTORE</remarks>
            Restore = 9,
            /// <summary>Sets the show state based on the SW_ value specified in the
            /// STARTUPINFO structure passed to the CreateProcess function by the
            /// program that started the application.</summary>
            /// <remarks>See SW_SHOWDEFAULT</remarks>
            ShowDefault = 10,
            /// <summary>Windows 2000/XP: Minimizes a window, even if the thread
            /// that owns the window is hung. This flag should only be used when
            /// minimizing windows from a different thread.</summary>
            /// <remarks>See SW_FORCEMINIMIZE</remarks>
            ForceMinimized = 11
        }
        #endregion
        
        /// <summary>
        /// The GetForegroundWindow function returns a handle to the foreground window.
        /// </summary>
        [DllImport("user32.dll")]
        internal static extern IntPtr GetForegroundWindow();

        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        internal static extern bool SetForegroundWindow(IntPtr hWnd);

        [DllImport("user32.dll")]
        [return: MarshalAs(UnmanagedType.Bool)]
        internal static extern bool IsIconic(IntPtr hWnd);

        //Get window position
        [DllImport("user32.dll")]
        public static extern bool GetWindowRect(IntPtr hwnd, ref Rect rectangle);

        public struct Rect
        {
            public int Left { get; set; }
            public int Top { get; set; }
            public int Right { get; set; }
            public int Bottom { get; set; }
        }

        #endregion
    }
}
