# pylint: disable=C0111,R0903

"""Displays the current keyboard layout using libX11

Requires the following library:
    * libX11.so.6
and python module:
    * xkbgroup

Parameters:
    * layout-xkb.showname: Boolean that indicate whether the full name should be displayed. Defaults to false (only the symbol will be displayed)
    * layout-xkb.show_variant: Boolean that indecates whether the variant name should be displayed. Defaults to true.
"""

from xkbgroup import *

import logging
log = logging.getLogger(__name__)

import core.module
import core.widget
import core.input

import util.format

class Module(core.module.Module):
    def __init__(self, config, theme):
        super().__init__(config, theme, core.widget.Widget(self.current_layout))

        core.input.register(self, button=core.input.LEFT_MOUSE,
            cmd=self.__next_keymap)
        core.input.register(self, button=core.input.RIGHT_MOUSE,
            cmd=self.__prev_keymap)
        self.__show_variant = util.format.asbool(self.parameter('show_variant', True))

    def __next_keymap(self, event):
        self.__set_keymap(1)

    def __prev_keymap(self, event):
        self.__set_keymap(-1)

    def __set_keymap(self, rotation):
        xkb = XKeyboard()
        if xkb.groups_count < 2: return # nothing to do
        layouts = xkb.groups_symbols
        idx = layouts.index(xkb.group_symbol)
        xkb.group_symbol = str(layouts[(idx + rotation) % len(layouts)])

    def current_layout(self, widget):
        try:
            xkb = XKeyboard()
            log.debug('group num: {}'.format(xkb.group_num))
            name = xkb.group_name if util.format.asbool(self.parameter('showname'), False) else xkb.group_symbol
            if self.__show_variant:
                return '{} ({})'.format(name, xkb.group_variant) if xkb.group_variant else name
            return name
        except Exception as e:
            print('got exception: {}'.format(e))
            return 'n/a'

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