import win32gui
import win32con
import win32api
import threading
from typing import Callable


def get_active_window() -> str:
    """Get the currently active window title on Windows"""
    try:
        hwnd = win32gui.GetForegroundWindow()
        return win32gui.GetWindowText(hwnd) or "Unknown Window"
    except:
        return "Error getting window title"


def register_session_listener(callback: Callable[[str], None]) -> None:
    """Register a callback for Windows session lock/unlock events"""

    def session_event_handler(hwnd, msg, wparam, lparam):
        # Check if the constant exists before using it
        try:
            if msg == win32con.WM_WTSSESSION_CHANGE:
                if wparam == getattr(win32con, 'WTS_SESSION_LOCK', 0x1):
                    callback("locked")
                elif wparam == getattr(win32con, 'WTS_SESSION_UNLOCK', 0x2):
                    callback("unlocked")
        except AttributeError:
            # Some versions of pywin32 might not have these constants
            # Use numeric values as fallback
            WM_WTSSESSION_CHANGE = 0x02B1
            WTS_SESSION_LOCK = 0x1
            WTS_SESSION_UNLOCK = 0x2

            if msg == WM_WTSSESSION_CHANGE:
                if wparam == WTS_SESSION_LOCK:
                    callback("locked")
                elif wparam == WTS_SESSION_UNLOCK:
                    callback("unlocked")

        return win32gui.DefWindowProc(hwnd, msg, wparam, lparam)

    def run_message_loop():
        hinst = win32api.GetModuleHandle(None)
        wndclass = win32gui.WNDCLASS()
        wndclass.hInstance = hinst
        wndclass.lpszClassName = "SessionWatcher"
        wndclass.lpfnWndProc = session_event_handler

        try:
            win32gui.RegisterClass(wndclass)
        except:
            pass  # Already registered

        # Corrected CreateWindow call with all required parameters
        hwnd = win32gui.CreateWindow(
            wndclass.lpszClassName,  # lpClassName
            "Session Watcher",  # lpWindowName
            0,  # dwStyle
            0,  # x
            0,  # y
            0,  # nWidth
            0,  # nHeight
            0,  # hWndParent
            0,  # hMenu
            hinst,  # hInstance
            None  # lParam
        )

        # Register for session notifications
        try:
            from win32ts import WTSRegisterSessionNotification
            WTSRegisterSessionNotification(hwnd, 1)  # NOTIFY_FOR_THIS_SESSION
        except ImportError:
            # pywin32 might not have win32ts on all systems
            pass

        # Start message loop
        win32gui.PumpMessages()

    # Run in a separate thread
    thread = threading.Thread(target=run_message_loop, daemon=True)
    thread.start()


def get_idle_time() -> int:
    """Get the system idle time in seconds on Windows"""
    from ctypes import Structure, windll, c_uint, sizeof, byref

    class LASTINPUTINFO(Structure):
        _fields_ = [('cbSize', c_uint), ('dwTime', c_uint)]

    lastInputInfo = LASTINPUTINFO()
    lastInputInfo.cbSize = sizeof(lastInputInfo)
    windll.user32.GetLastInputInfo(byref(lastInputInfo))

    millis = windll.kernel32.GetTickCount() - lastInputInfo.dwTime
    return millis // 1000  # Convert milliseconds to seconds