"""Private X11 window that reports physical OCR click events."""
import json
import sys

from Xlib import X, Xatom, display


connection = display.Display()
screen = connection.screen()
root = screen.root
window = root.create_window(20, 20, 240, 140, 0, screen.root_depth,
                            X.InputOutput, X.CopyFromParent,
                            event_mask=X.ButtonPressMask | X.ButtonReleaseMask)
window.map()
root.change_property(connection.intern_atom("_NET_ACTIVE_WINDOW"), Xatom.WINDOW, 32, [window.id])
window.set_input_focus(X.RevertToParent, X.CurrentTime)
connection.sync()
initial_pointer = root.query_pointer()
print(json.dumps({"window": window.id, "width": screen.width_in_pixels,
                  "height": screen.height_in_pixels,
                  "pointer": [initial_pointer.root_x, initial_pointer.root_y]}), flush=True)
for line in sys.stdin:
    if line.strip() != "events":
        break
    connection.sync()
    events = []
    while connection.pending_events():
        event = connection.next_event()
        if event.type in (X.ButtonPress, X.ButtonRelease):
            events.append({"pressed": event.type == X.ButtonPress,
                           "button": event.detail, "x": event.root_x, "y": event.root_y})
    pointer = root.query_pointer()
    print(json.dumps({"events": events, "pointer": [pointer.root_x, pointer.root_y]}), flush=True)
connection.close()