#pylint: disable=C0111,R0903

'''Displays the name, IP address(es) and status of each available network interface.

Requires the following python module:
    * netifaces

Parameters:
    * nic.exclude: Comma-separated list of interface prefixes to exclude (defaults to 'lo,virbr,docker,vboxnet,veth,br')
    * nic.include: Comma-separated list of interfaces to include
    * nic.states: Comma-separated list of states to show (prefix with '^' to invert - i.e. ^down -> show all devices that are not in state down)
    * nic.format: Format string (defaults to '{intf} {state} {ip} {ssid}')
'''

import shutil
import netifaces
import subprocess

import core.widget
import core.module
import util.cli
import util.format

class Module(core.module.Module):
    def __init__(self, config):
        widgets = []
        super().__init__(config, widgets)
        self._exclude = tuple(filter(len, self.parameter('exclude', 'lo,virbr,docker,vboxnet,veth,br').split(',')))
        self._include = self.parameter('include', '').split(',')

        self._states = { 'include': [], 'exclude': []  }
        for state in tuple(filter(len, util.format.aslist(self.parameter('states', '')))):
            if state[0] == '^':
                self._states['exclude'].append(state[1:])
            else:
                self._states['include'].append(state)
        self._format = self.parameter('format','{intf} {state} {ip} {ssid}');
        self.iwgetid = shutil.which('iwgetid')
        self._update_widgets(widgets)

    def update(self):
        self._update_widgets(self.widgets())

    def state(self, widget):
        states = []

        if widget.get('state') == 'down':
            states.append('critical')
        elif widget.get('state') != 'up':
            states.append('warning')

        intf = widget.get('intf')
        iftype = 'wireless' if self._iswlan(intf) else 'wired'
        iftype = 'tunnel' if self._istunnel(intf) else iftype

        states.append('{}-{}'.format(iftype, widget.get('state')))

        return states

    def _iswlan(self, intf):
        # wifi, wlan, wlp, seems to work for me
        if intf.startswith('w'): return True
        return False

    def _istunnel(self, intf):
        return intf.startswith('tun') or intf.startswith('wg')

    def get_addresses(self, intf):
        retval = []
        try:
            for ip in netifaces.ifaddresses(intf).get(netifaces.AF_INET, []):
                if ip.get('addr', '') != '':
                    retval.append(ip.get('addr'))
        except Exception:
            return []
        return retval

    def _update_widgets(self, widgets):
        interfaces = [i for i in netifaces.interfaces() if not i.startswith(self._exclude)]
        interfaces.extend([i for i in netifaces.interfaces() if i in self._include])

        for widget in widgets:
            widget.set('visited', False)

        for intf in interfaces:
            addr = []
            state = 'down'
            for ip in self.get_addresses(intf):
                addr.append(ip)
                state = 'up'

            if len(self._states['exclude']) > 0 and state in self._states['exclude']: continue
            if len(self._states['include']) > 0 and state not in self._states['include']: continue

            widget = self.widget(intf)
            if not widget:
                widget = core.widget.Widget(name=intf, module=self)
                widgets.append(widget)
            # join/split is used to get rid of multiple whitespaces (in case SSID is not available, for instance
            widget.full_text(' '.join(self._format.format(ip=', '.join(addr),intf=intf,state=state,ssid=self.get_ssid(intf)).split()))
            widget.set('intf', intf)
            widget.set('state', state)
            widget.set('visited', True)

        for widget in widgets:
            if widget.get('visited') is False:
                widgets.remove(widget)

    def get_ssid(self, intf):
        if self._iswlan(intf) and self.iwgetid:
            return util.cli.execute('{} -r {}'.format(self.iwgetid, intf), ignore_errors=True)
        return ''

# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4