# -*- coding: utf-8 -*-
from __future__ import print_function
import willie

import shelve
import time

from ffpb import ffpb_ping, playitsafe, pretty_date

monitored_nodes = None


def setup(bot):
    """Called by willie upon loading this plugin."""

    global monitored_nodes

    # load list of monitored nodes and their last status from disk
    monitored_nodes = shelve.open('nodes.monitored', writeback=True)


def shutdown(bot):
    """Called by willie upon unloading this plugin."""

    global monitored_nodes

    # store monitored nodes
    if not monitored_nodes is None:
        monitored_nodes.sync()
        monitored_nodes.close()
        monitored_nodes = None


@willie.module.interval(3*60)
def ffpb_monitor_ping(bot):
    """Ping each node currently under surveillance."""

    # determine where-to to send alerts
    notify_target = bot.config.core.owner
    if not bot.config.ffpb.msg_target is None:
        notify_target = bot.config.ffpb.msg_target

    # check each node under surveillance
    for node in monitored_nodes:
        mon = monitored_nodes[node]
        last_status = mon['status']
        last_check = mon['last_check']
        last_success = mon['last_success']

        current_status = ffpb_ping(bot=bot, target_name=node, reply_directly=False)

        if current_status is None:
            current_status = False

        mon['status'] = current_status
        mon['last_check'] = time.time()

        if current_status is True:
            mon['last_success'] = time.time()

        print("Monitoring ({0}) {1} (last: {2} at {3})".format(
            node,
            current_status,
            last_status,
            time.strftime('%Y-%m-%d %H:%M', time.localtime(last_check))),
        )
        if last_status != current_status and (last_status or current_status):
            if last_check is None:
                # erster Check, keine Ausgabe
                continue

            if current_status is True:
                msg = 'Monitoring: Knoten \'{0}\' pingt wieder (zuletzt {1})'
            else:
                msg = 'Monitoring: Knoten \'{0}\' DOWN'
            bot.msg(notify_target, msg.format(
                node,
                pretty_date(last_success) if not last_success is None else '[nie]',
            ))


@willie.module.commands('monitor')
def ffpb_monitor(bot, trigger):
    """
    Monitoring capability of the bot.
    Try subcommands add, del, info and list.
    """

    # command is restricted to bot admins
    if not playitsafe(bot, trigger, botadmin=True):
        return

    # ensure the user gave arguments
    if trigger.group(2) is None or len(trigger.group(2)) == 0:
        bot.say('Das Monitoring sagt du hast doofe Ohren.')
        return

    # read additional arguments
    cmd = trigger.group(3)
    node = trigger.group(4)
    if not node is None:
        node = str(node)

    # subcommand 'add': add a node to monitoring
    if cmd == "add":
        if node in monitored_nodes:
            bot.say('Knoten \'{0}\' wird bereits gemonitored.'.format(node))
            return

        monitored_nodes[node] = {
            'added': trigger.sender,
            'status': None,
            'last_check': None,
            'last_success': None,
        }

        bot.say('Knoten \'{0}\' wird jetzt ganz genau beobachtet.'.format(node))
        return

    # subcommand 'del': remote a node from monitoring
    if cmd == "del":
        if not node in monitored_nodes:
            bot.say('Knoten \'{0}\' war gar nicht im Monitoring?!?'.format(node))
            return
        del monitored_nodes[node]
        bot.say('Okidoki, \'{0}\' lasse ich jetzt links liegen.'.format(node))
        return

    # subcommand 'info': monitoring status of a node
    if cmd == "info":
        if node in monitored_nodes:
            info = monitored_nodes[node]
            bot.say('Knoten \'{0}\' wurde zuletzt {1} gepingt (Ergebnis: {2})'.format(node, pretty_date(info['last_check']) if not info['last_check'] is None else "^W noch nie", info['status']))
        else:
            bot.say('Knoten \'{0}\' ist nicht im Monitoring.'.format(node))
        return

    # subcommand 'list': enumerate all monitored nodes
    if cmd == "list":
        nodes = ""
        for node in monitored_nodes:
            nodes = nodes + " " + node
        bot.say('Monitoring aktiv für:' + nodes)
        return

    # subcommand 'help': give some hints what the user can do
    if cmd == "help":
        bot.say('Entweder "!monitor list" oder "!monitor {add|del|info} <node>"')
        return

    # no valid subcommand given: complain
    bot.say('Mit "' + str(cmd) + '" kann ich nix anfangen, probier doch mal "!monitor help".')