# pylint: disable=C0111,R0903

"""Displays APT package update information (<to upgrade>/<to remove >)
Requires the following packages:
    * aptitude

"""

import re
import threading

import core.module
import core.widget
import core.decorators

import util.cli

PATTERN = '{} packages upgraded, {} newly installed, {} to remove and {} not upgraded.'

def parse_result(to_parse):
    # We want to line with the iforamtion about package upgrade
    line_to_parse = to_parse.split('\n')[-4]
    result = re.search('(.+) packages upgraded, (.+) newly installed, (.+) to remove', line_to_parse)

    return int(result.group(1)), int(result.group(3))

def get_apt_check_info(module):
    widget = module.widget()
    try:
        res = util.cli.execute('aptitude full-upgrade --simulate --assume-yes')
        widget.set('error', None)
    except (RuntimeError, FileNotFoundError) as e:
        widget.set('error', 'unable to query APT: {}'.format(e))
        return

    to_upgrade = 0
    to_remove = 0
    try:
        to_upgrade, to_remove = parse_result(res)
        widget.set('to_upgrade', to_upgrade)
        widget.set('to_remove', to_remove)
    except Exception as e:
        widget.set('error', 'parse error: {}'.format(e))

    core.event.trigger('update', [ module.id ], redraw_only=True)

class Module(core.module.Module):
    @core.decorators.every(minutes=30)
    def __init__(self, config, theme):
        super().__init__(config, theme, core.widget.Widget(self.updates))
        self.__thread = None

    def updates(self, widget):
        if widget.get('error'):
            return widget.get('error')
        return '{} to upgrade, {} to remove'.format(
            widget.get('to_upgrade', 0), widget.get('to_remove', 0)
        )

    def update(self):
        if self.__thread and self.__thread.isAlive(): return

        self.__thread = threading.Thread(target=get_apt_check_info, args=(self,))
        self.__thread.start()

    def state(self, widget):
        cnt = 0
        ret = 'good'
        for t in ['to_upgrade', 'to_remove']:
            cnt += widget.get(t, 0)
        if cnt > 50:
            ret = 'critical'
        elif cnt > 0:
            ret = 'warning'
        if widget.get('error'):
            ret = 'critical'

        return ret

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