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src/time_tracker/platform/windows.py

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+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):
+        if msg == win32con.WM_WTSSESSION_CHANGE:
+            if wparam == win32con.WTS_SESSION_LOCK:
+                callback("locked")
+            elif wparam == win32con.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
+
+        hwnd = win32gui.CreateWindow(
+            wndclass.lpszClassName,
+            "Session Watcher",
+            0, 0, 0, 0, 0,
+            0, hinst, None
+        )
+
+        # 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