from subprocess import run
from pathlib import Path
from typing import Optional

from libqtile.log_utils import logger
from libqtile.xcbq import Monitor

from .backlight import Backlight


Side = str # one of 'left-of', 'right-of', 'above', 'below' or 'same-as'


def enable_monitor(monitor: Monitor, primary: bool=False, side: Optional[Side]=None,
                   relative_monitor: Optional[Monitor]=None) -> None:
    command = ['xrandr', '--output', monitor.name, '--auto']
    if primary:
        command += ['--primary']
    if side:
        if not relative_monitor:
            raise Exception('Need a monitor to be relative to')
        command += ['--{}'.format(side), relative_monitor.name]
    run(command)
    logger.info(f'Running command: {" ".join(command)}')