using System;
using System.Runtime.InteropServices;

namespace Notify.Interop;

internal static partial class Win32
{
    [LibraryImport("user32.dll")]
    internal static partial IntPtr GetForegroundWindow();

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

    [LibraryImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    internal static partial bool AllowSetForegroundWindow(uint dwProcessId);

    [LibraryImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    internal static partial bool AttachThreadInput(uint idAttach, uint idAttachTo, [MarshalAs(UnmanagedType.Bool)] bool fAttach);

    [LibraryImport("user32.dll")]
    internal static partial uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId);

    [LibraryImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    internal static partial bool BringWindowToTop(IntPtr hWnd);

    [LibraryImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    internal static partial bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int x, int y, int cx, int cy, uint uFlags);

    [LibraryImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    internal static partial bool ShowWindow(IntPtr hWnd, int nCmdShow);

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

    [LibraryImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    internal static partial bool IsWindow(IntPtr hWnd);

    [LibraryImport("user32.dll")]
    internal static partial void SwitchToThisWindow(IntPtr hWnd, [MarshalAs(UnmanagedType.Bool)] bool fAltTab);

    [LibraryImport("user32.dll")]
    internal static partial void keybd_event(byte bVk, byte bScan, uint dwFlags, IntPtr dwExtraInfo);

    [LibraryImport("kernel32.dll")]
    internal static partial uint GetCurrentThreadId();

    [LibraryImport("user32.dll", EntryPoint = "GetClassNameW", StringMarshalling = StringMarshalling.Utf16)]
    internal static partial int GetClassName(IntPtr hWnd, ref char lpClassName, int nMaxCount);

    [LibraryImport("user32.dll", EntryPoint = "GetWindowLongPtrW")]
    internal static partial IntPtr GetWindowLongPtr(IntPtr hWnd, int nIndex);

    [LibraryImport("user32.dll", EntryPoint = "SetWindowLongPtrW")]
    internal static partial IntPtr SetWindowLongPtr(IntPtr hWnd, int nIndex, IntPtr dwNewLong);

    // 把窗口设为工具窗口：从任务栏与 Alt+Tab 中隐藏
    internal static void MakeToolWindow(IntPtr hWnd)
    {
        var ex = GetWindowLongPtr(hWnd, GWL_EXSTYLE).ToInt64();
        ex = (ex | WS_EX_TOOLWINDOW) & ~WS_EX_APPWINDOW;
        SetWindowLongPtr(hWnd, GWL_EXSTYLE, new IntPtr(ex));
    }

    // 取窗口类名
    internal static string GetClassNameOf(IntPtr hWnd)
    {
        var buf = new char[256];
        var n = GetClassName(hWnd, ref buf[0], buf.Length);
        return n > 0 ? new string(buf, 0, n) : "";
    }

    // --- 常量 ---
    internal const uint ASFW_ANY = 0xFFFFFFFF;
    internal const int SW_RESTORE = 9;
    internal const int SW_SHOW = 5;
    internal const uint SWP_NOSIZE = 0x0001;
    internal const uint SWP_NOMOVE = 0x0002;
    internal const uint SWP_SHOWWINDOW = 0x0040;
    internal const byte VK_MENU = 0x12;
    internal const uint KEYEVENTF_KEYUP = 0x0002;
    internal const int GWL_EXSTYLE = -20;
    internal const long WS_EX_TOOLWINDOW = 0x00000080;
    internal const long WS_EX_APPWINDOW = 0x00040000;
}