import threading
import time

import pyperclip


class ClipboardWatcher:
    """Watches clipboard for changes and updates IO placeholder"""

    def __init__(self, io, verbose=False):
        self.io = io
        self.verbose = verbose
        self.stop_event = None
        self.watcher_thread = None
        self.last_clipboard = None
        self.io.clipboard_watcher = self

    def start(self):
        """Start watching clipboard for changes"""
        self.stop_event = threading.Event()
        self.last_clipboard = pyperclip.paste()

        def watch_clipboard():
            while not self.stop_event.is_set():
                try:
                    current = pyperclip.paste()
                    if current != self.last_clipboard:
                        self.last_clipboard = current
                        self.io.interrupt_input()
                        self.io.placeholder = current
                        if len(current.splitlines()) > 1:
                            self.io.placeholder = "\n" + self.io.placeholder + "\n"

                    time.sleep(0.5)
                except Exception as e:
                    if self.verbose:
                        from aider.dump import dump

                        dump(f"Clipboard watcher error: {e}")
                    continue

        self.watcher_thread = threading.Thread(target=watch_clipboard, daemon=True)
        self.watcher_thread.start()

    def stop(self):
        """Stop watching clipboard for changes"""
        if self.stop_event:
            self.stop_event.set()
        if self.watcher_thread:
            self.watcher_thread.join()
            self.watcher_thread = None
            self.stop_event = None


def main():
    """Example usage of the clipboard watcher"""
    from aider.io import InputOutput

    io = InputOutput()
    watcher = ClipboardWatcher(io, verbose=True)

    try:
        watcher.start()
        while True:
            time.sleep(1)
    except KeyboardInterrupt:
        print("\nStopped watching clipboard")
        watcher.stop()


if __name__ == "__main__":
    main()