"""GTK provider geometry paired with independently measured X11 rectangles."""
import json
import os
import sys
import gi

gi.require_version('Gtk', '3.0')
gi.require_version('GdkX11', '3.0')
gi.require_version('Gdk', '3.0')
from gi.repository import Gdk, GdkX11, GLib, Gtk
from Xlib import X, Xatom, display


def main():
    window = Gtk.Window(title='OCR geometry fixture')
    window.set_decorated(False)
    window.set_default_size(300, 200)
    window.move(40, 30)
    fixed = Gtk.Fixed()
    window.add(fixed)
    painted = Gtk.DrawingArea()
    painted.set_size_request(80, 50)
    painted.set_can_focus(True)
    painted.get_accessible().set_name('Painted target')

    def draw(_widget, context):
        context.set_source_rgb(0.2, 0.4, 0.6)
        context.paint()
        return False

    painted.connect('draw', draw)
    fixed.put(painted, 10, 15)
    password = Gtk.Entry()
    password.set_visibility(False)
    password.get_accessible().set_name('Protected target')
    fixed.put(password, 10, 90)
    window.show_all()
    painted.grab_focus()
    Gdk.Display.get_default().sync()
    connection = display.Display()
    root = connection.screen().root
    activeAtom = connection.intern_atom('_NET_ACTIVE_WINDOW')
    clientId = GdkX11.X11Window.get_xid(window.get_window())
    client = connection.create_resource_object('window', clientId)
    root.change_property(activeAtom, Xatom.WINDOW, 32, [clientId])
    client.change_property(connection.intern_atom('_NET_WM_PID'), Xatom.CARDINAL, 32, [os.getpid()])
    client.set_input_focus(X.RevertToParent, X.CurrentTime)
    connection.sync()

    def rectangle(widget):
        native = connection.create_resource_object('window', GdkX11.X11Window.get_xid(widget.get_window()))
        origin = root.translate_coords(native, 0, 0)
        geometry = native.get_geometry()
        return [origin.x, origin.y, origin.x + geometry.width, origin.y + geometry.height]

    def state():
        connection.sync()
        return dict(window=clientId, target=rectangle(painted), focus=connection.get_input_focus().focus.id)

    GLib.idle_add(lambda: (print(json.dumps(state()), flush=True), False)[1])

    def command_ready(_source, condition):
        if condition & GLib.IO_HUP:
            Gtk.main_quit()
            return False
        line = sys.stdin.readline()
        if not line:
            Gtk.main_quit()
            return False
        command = json.loads(line)
        action = command['action']
        if action == 'hide':
            painted.hide()
        elif action == 'password':
            password.grab_focus()
        elif action == 'move':
            window.move(100, 60)
        elif action != 'state':
            raise ValueError('unknown fixture action')
        GLib.idle_add(lambda: (print(json.dumps(state()), flush=True), False)[1])
        return True

    GLib.io_add_watch(sys.stdin, GLib.IO_IN | GLib.IO_HUP, command_ready)
    Gtk.main()
    connection.close()


if __name__ == '__main__':
    main()