"""Text-Einfügung via pynput Clipboard + Ctrl+V (Windows)."""

import asyncio
import logging

from pynput.keyboard import Controller, Key

logger = logging.getLogger(__name__)

PASTE_DELAY = 0.2


class Win32Inserter:
    def __init__(self):
        self._keyboard = Controller()

    def _get_clipboard(self) -> str:
        """Liest den aktuellen Clipboard-Inhalt (Text)."""
        import win32clipboard
        try:
            win32clipboard.OpenClipboard()
            try:
                data = win32clipboard.GetClipboardData(win32clipboard.CF_UNICODETEXT)
                return data
            except TypeError:
                return ""
            finally:
                win32clipboard.CloseClipboard()
        except Exception:
            return ""

    def _set_clipboard(self, text: str) -> None:
        """Setzt den Clipboard-Inhalt."""
        import win32clipboard
        win32clipboard.OpenClipboard()
        try:
            win32clipboard.EmptyClipboard()
            win32clipboard.SetClipboardText(text, win32clipboard.CF_UNICODETEXT)
        finally:
            win32clipboard.CloseClipboard()

    def _send_paste(self) -> None:
        """Simuliert Ctrl+V."""
        self._keyboard.press(Key.ctrl)
        self._keyboard.press('v')
        self._keyboard.release('v')
        self._keyboard.release(Key.ctrl)

    async def insert(self, text: str) -> None:
        """Fügt Text ins aktive Fenster ein via Clipboard + Ctrl+V."""
        if not text:
            return

        old_clipboard = await asyncio.to_thread(self._get_clipboard)

        try:
            await asyncio.to_thread(self._set_clipboard, text)
            await asyncio.sleep(0.05)
            await asyncio.to_thread(self._send_paste)
            await asyncio.sleep(PASTE_DELAY)
        finally:
            await asyncio.to_thread(self._set_clipboard, old_clipboard)

        logger.info("Text eingefügt (%d Zeichen)", len(text))