using System;
using System.Runtime.InteropServices;

namespace Hardcodet.Wpf.TaskbarNotification.Interop
{
    /// <summary>
    /// Win32 API imports.
    /// </summary>
    internal static class WinApi
    {
        private const string User32 = "user32.dll";

        /// <summary>
        /// Creates, updates or deletes the taskbar icon.
        /// </summary>
        [DllImport("shell32.Dll", CharSet = CharSet.Unicode)]
        public static extern bool Shell_NotifyIcon(NotifyCommand cmd, [In] ref NotifyIconData data);


        /// <summary>
        /// Creates the helper window that receives messages from the taskar icon.
        /// </summary>
        [DllImport(User32, EntryPoint = "CreateWindowExW", SetLastError = true)]
        public static extern IntPtr CreateWindowEx(int dwExStyle, [MarshalAs(UnmanagedType.LPWStr)] string lpClassName,
            [MarshalAs(UnmanagedType.LPWStr)] string lpWindowName, int dwStyle, int x, int y,
            int nWidth, int nHeight, IntPtr hWndParent, IntPtr hMenu, IntPtr hInstance,
            IntPtr lpParam);


        /// <summary>
        /// Processes a default windows procedure.
        /// </summary>
        [DllImport(User32)]
        public static extern IntPtr DefWindowProc(IntPtr hWnd, uint msg, IntPtr wparam, IntPtr lparam);

        /// <summary>
        /// Registers the helper window class.
        /// </summary>
        [DllImport(User32, EntryPoint = "RegisterClassW", SetLastError = true)]
        public static extern short RegisterClass(ref WindowClass lpWndClass);

        /// <summary>
        /// Registers a listener for a window message.
        /// </summary>
        /// <param name="lpString"></param>
        /// <returns>uint</returns>
        [DllImport(User32, EntryPoint = "RegisterWindowMessageW")]
        public static extern uint RegisterWindowMessage([MarshalAs(UnmanagedType.LPWStr)] string lpString);

        /// <summary>
        /// Used to destroy the hidden helper window that receives messages from the
        /// taskbar icon.
        /// </summary>
        /// <param name="hWnd"></param>
        /// <returns>bool</returns>
        [DllImport(User32, SetLastError = true)]
        public static extern bool DestroyWindow(IntPtr hWnd);


        /// <summary>
        /// Gives focus to a given window.
        /// </summary>
        /// <param name="hWnd"></param>
        /// <returns>bool</returns>
        [DllImport(User32)]
        public static extern bool SetForegroundWindow(IntPtr hWnd);


        /// <summary>
        /// Gets the maximum number of milliseconds that can elapse between a
        /// first click and a second click for the OS to consider the
        /// mouse action a double-click.
        /// </summary>
        /// <returns>The maximum amount of time, in milliseconds, that can
        /// elapse between a first click and a second click for the OS to
        /// consider the mouse action a double-click.</returns>
        [DllImport(User32, CharSet = CharSet.Auto, ExactSpelling = true)]
        public static extern int GetDoubleClickTime();


        /// <summary>
        /// Gets the screen coordinates of the current mouse position.
        /// </summary>
        [DllImport(User32, SetLastError = true)]
        public static extern bool GetPhysicalCursorPos(ref Point lpPoint);


        [DllImport(User32, SetLastError = true)]
        public static extern bool GetCursorPos(ref Point lpPoint);
    }
}