#!/usr/bin/env python3

'''
monitor-menu.py
Usage:
    monitor-menu.py
    monitor-menu.py <profile>
'''

from os.path import expanduser

import dialog
import docopt
import json
import subprocess

d = dialog.Dialog()

class MonitorMenu():
    def __init__(self, config_file='~/.config/monitor-profiles.json'):
        with open(expanduser(config_file)) as fd:
            self.profiles = json.load(fd)

    def run(self, profile_idx=None):
        choices = []

        if profile_idx is None:
            i = 0
            for p in self.profiles:
                choices.append((str(i), p['name']))
                i += 1

            code, profile_idx = d.menu('Select the profile you want to use.', choices=choices)

            if code == d.ESC or code == d.CANCEL:
                return

        profile = self.profiles[int(profile_idx)]

        # We build the command line starting from just "xrandr" and adding arguments.
        xrandr_cmd = ['xrandr']
        feh_cmd = ['feh', '--bg-fill']

        try:
            xrandr_cmd += profile['xrandr-opts']
        except KeyError:
            pass

        for monitor in profile['monitors']:
            xrandr_cmd.extend(monitor['xrandr-opts'])

            if monitor['background'] is not None:
                feh_cmd.append(monitor['background']);

        subprocess.run(xrandr_cmd)
        subprocess.run(feh_cmd)


def main(argv=None):
    args = docopt.docopt(__doc__, version='1', argv=argv)

    menu = MonitorMenu()

    try:
        if '<profile>' in args and args['<profile>'] is not None:
            menu.run(int(args['<profile>']))
        else:
            menu.run()

    except ValueError as e:
        raise docopt.DocoptExit(str(e))

if __name__ == '__main__':
    main()