cleaning up desktop interactions. need to move things into individual files

src/main/kotlin/controllers/DesktopController.kt

@@ -84,14 +84,149 @@ interface DesktopController {
     }
 }
 
-class WindowsDesktopController : DesktopController {
+interface OSProxy{
+    fun getActiveWindowName(): String
+}
 
+/**
+ * Windows implementation of [DesktopController].
+ *
+ * This class provides methods to interact with the desktop on Windows
+ * by calling Win32 APIs.
+ *
+ * It implements the [DesktopController] interface to provide desktop
+ * functionality like getting the mouse pointer location on Windows.
+ */
+class WindowsDesktopController : DesktopController, OSProxy {
+
+    companion object{
+        /**
+         * Converts a native byte buffer to a String.
+         *
+         * This takes a byte array [byteBuffer] containing text from a native Win32 call,
+         * converts it to a String using JNA, and trims whitespace characters.
+         *
+         * Usage example:
+         *
+         * ```
+         * val buffer = ByteArray(256)
+         * GetWindowTextA(hwnd, buffer, buffer.size) // Win32 call
+         *
+         * val windowTitle = nativeByteBufferToString(buffer)
+         * println(windowTitle) // Print title string
+         * ```
+         *
+         * @param byteBuffer Byte array containing text from a native call
+         * @return The native text as a String
+         */
+        private fun nativeByteBufferToString(byteBuffer: ByteArray): String{
+            // I guess this prunes anything that isn't on the ascii table?
+            val wText = Native.toString(byteBuffer).trim { it <= ' ' }
+            return wText
+        }
+    }
+
+    /**
+     * Interface for calling Windows User32 API functions.
+     *
+     * This defines an interface extending StdCallLibrary to call native
+     * Windows User32 library functions like EnumWindows, GetWindowTextA etc.
+     *
+     * Classes can implement this interface to make direct calls to the
+     * User32 DLL on Windows.
+     */
     internal interface User32 : StdCallLibrary {
+
+        /**
+         * Interface for a Windows callback function to enumerate windows.
+         *
+         * This extends the StdCallLibrary.StdCallCallback to define a callback
+         * method that will be invoked by the Windows API EnumWindows function.
+         *
+         * The callback method accepts a window handle (HWND) and a user-defined
+         * pointer, and returns a Boolean indicating whether to continue enumeration.
+         *
+         * Usage example:
+         * ```
+         * val callback = object : WNDENUMPROC {
+         *   override fun callback(hWnd: Pointer?, arg: Pointer?): Boolean {
+         *     // Check if hWnd matches target window
+         *     if (matchesTarget(hWnd)) {
+         *       // Found target window, stop enumeration
+         *       return false
+         *     }
+         *     // Keep enumerating
+         *     return true
+         *   }
+         * }
+         * ```
+         *
+         * @param hWnd Window handle (HWND) for the current enumerated window.
+         * @param arg User-defined data pointer passed to EnumWindows.
+         * @return True to continue enumerating windows, false to stop.
+         */
         interface WNDENUMPROC : StdCallLibrary.StdCallCallback {
             fun callback(hWnd: Pointer?, arg: Pointer?): Boolean
         }
 
+        /**
+         * Enumerates windows on the system.
+         *
+         * This calls the Windows API EnumWindows function to enumerate all top-level windows.
+         *
+         * For each window, it calls the provided [WNDENUMPROC] callback function,
+         * passing the window handle [hWnd] and user-defined [userData] pointer.
+         *
+         * Enumeration can be stopped by returning false from the callback.
+         *
+         * Usage example:
+         *
+         * ```
+         * val windows = mutableListOf<HWND>()
+         *
+         * val callback = object : WNDENUMPROC {
+         *   override fun callback(hWnd: Pointer?, arg: Pointer?): Boolean {
+         *     windows.add(hWnd) // Add hWnd to list
+         *     return true // Continue enumerating
+         *   }
+         * }
+         *
+         * EnumWindows(callback, null) // Get all top-level windows
+         *
+         * println(windows) // Print list of HWNDs
+         * ```
+         *
+         * @param lpEnumFunc The [WNDENUMPROC] callback to call for each window.
+         * @param userData Optional user-defined data to pass to the callback.
+         * @return True if successful, false otherwise.
+         */
         fun EnumWindows(lpEnumFunc: WNDENUMPROC?, userData: Pointer?): Boolean
+
+        /**
+         * Gets the title text of the specified window.
+         *
+         * This calls the Win32 API GetWindowTextA function to get the title
+         * text for the window handle [hWnd].
+         *
+         * The window text is copied into the [lpString] buffer up to [nMaxCount] characters.
+         *
+         * Usage example:
+         *
+         * ```
+         * val buffer = ByteArray(256)
+         * val hwnd = getWindowHandle() // get some HWND
+         *
+         * GetWindowTextA(hwnd, buffer, buffer.size)
+         *
+         * val windowTitle = String(buffer)
+         * println(windowTitle)
+         * ```
+         *
+         * @param hWnd The window handle (HWND).
+         * @param lpString The buffer to receive the window text.
+         * @param nMaxCount The maximum number of characters to copy to the buffer.
+         * @return The length of the window text (excluding null-terminator).
+         */
         fun GetWindowTextA(hWnd: Pointer?, lpString: ByteArray?, nMaxCount: Int): Int
 
         fun GetForegroundWindow(): Pointer?
@@ -103,13 +238,28 @@ class WindowsDesktopController : DesktopController {
 
     }
 
-    fun getCurrentlyActiveWindowName(): String {
+    /**
+     * Gets the title of the active/foreground window.
+     *
+     * This calls Win32 APIs to get the handle of the foreground window,
+     * then gets its title text.
+     *
+     * Usage example:
+     *
+     * ```
+     * val activeWindowName = getActiveWindowName()
+     *
+     * println(activeWindowName) // Prints foreground window title
+     * ```
+     *
+     * @return The title text of the current foreground window.
+     */
+    override fun getActiveWindowName(): String {
         val user32 = User32.INSTANCE
+        val textBuffer = ByteArray(512)
 
-        val windowText = ByteArray(512)
-        val hWnd = user32.GetForegroundWindow()
-        user32.GetWindowTextA(hWnd, windowText, 512)
-        val wText = Native.toString(windowText).trim { it <= ' ' } //i have no idea what this does
-        return wText
+        user32.GetWindowTextA(user32.GetForegroundWindow(), textBuffer, 512)
+
+        return nativeByteBufferToString(textBuffer)
     }
 }

src/test/kotlin/controllers/DesktopControllerTest.kt

@@ -64,6 +64,6 @@ class DesktopControllerTest {
     @Test
     fun devTest(){
         val c = WindowsDesktopController()
-        println("TEXT: ${ c.getCurrentlyActiveWindowName()}")
+        println("TEXT: ${ c.getActiveWindowName()}")
     }
 }