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#! /usr/bin/env python
#
# //Reaktor/IRC/asybot.py
#
import logging
import logging.handlers
from asynchat import async_chat as asychat
from datetime import datetime as date
from datetime import timedelta
from re import search, split
from signal import SIGALRM, alarm, signal
from socket import AF_INET, SOCK_STREAM
from textwrap import TextWrapper
from time import sleep

# s/\x1B\[([0-9]{1,2}(;[0-9]{1,2})?)?[m|K]//g -- removes color codes


class asybot(asychat):
    def __init__(
        self, server, port, nickname, channels, realname=False, username=False,
        hostname=False, hammer_interval=10, alarm_timeout=300,
        kill_timeout=360, loglevel=logging.ERROR, nickserv_password=None
    ):
        asychat.__init__(self)
        # logger magic
        self.log = logging.getLogger('asybot_' + nickname)
        self.nickname = nickname

        if realname:
            self.realname = realname
        else:
            self.realname = nickname

        if username:
            self.username = username
        else:
            self.username = nickname

        if hostname:
            self.hostname = hostname
        else:
            self.hostname = nickname

        self.retry = True
        self.server = server
        self.port = port
        self.channels = channels
        self.data = ''
        self.myterminator = '\r\n'
        self.set_terminator(self.myterminator.encode())
        self.create_socket(AF_INET, SOCK_STREAM)
        self.connect((self.server, self.port))
        self.wrapper = TextWrapper(subsequent_indent=" ", width=400)
        self.nickserv_password = nickserv_password

        self.log.info('=> irc://%s@%s:%s/%s' %
                      (self.nickname, self.server, self.port, self.channels))

        # When we don't receive data for alarm_timeout seconds then issue a
        # PING every hammer_interval seconds until kill_timeout seconds have
        # passed without a message.  Any incoming message will reset alarm.
        self.alarm_timeout = alarm_timeout
        self.hammer_interval = hammer_interval
        self.kill_timeout = kill_timeout
        try:
            signal(SIGALRM, lambda signum, frame: self.alarm_handler())
        except Exception as e:
            print('asybot: ' + str(e))
        self.reset_alarm()

    def reset_alarm(self):
        self.last_activity = date.now()
        alarm(self.alarm_timeout)

    def alarm_handler(self):
        delta = date.now() - self.last_activity
        if delta > timedelta(seconds=self.kill_timeout):
            self.log.error('No data for %s.  Giving up...' % delta)
            self.handle_disconnect()
        else:
            self.log.error('No data for %s.  PINGing server...' % delta)
            self.push('PING :%s' % self.nickname)
            alarm(self.hammer_interval)

    def collect_incoming_data(self, data):
        try:
            self.data += data.decode()
        except Exception as e:
            print('error decoding message: ' + str(e))
            print('current data: %s' % self.data)
            print('received data: %s' % data)
            print('trying to decode as latin1')
            self.data += data.decode('latin1')

    def found_terminator(self):
        self.log.debug('<< %s' % self.data)

        message = self.data
        self.data = ''
        try:
            _, prefix, command, params, rest, _ = \
                split(
                    '^(?::(\S+)\s)?(\S+)((?:\s[^:]\S*)*)(?:\s:(.*))?$',
                    message,
                )
        except Exception as e:
            print("cannot split message :(\nmsg: %s" % message)
            return
        params = params.split(' ')[1:]

        if command == 'PING':
            self.push('PONG :%s' % rest)
            self.log.debug("Replying to servers PING with PONG :%s" % rest)
            self.on_ping(prefix, command, params, rest)

        elif command == 'PRIVMSG':
            self.on_privmsg(prefix, command, params, rest)

        elif command == 'INVITE':
            self.on_invite(prefix, command, params, rest)

        elif command == 'KICK':
            self.on_kick(prefix, command, params, rest)

        elif command == 'JOIN':
            self.on_join(prefix, command, params, rest)

        elif command == '433':
            # ERR_NICKNAMEINUSE, retry with another name
            self.on_nickinuse(prefix, command, params, rest)

        elif command == '376' or command == '422':
            self.on_welcome(prefix, command, params, rest)

        elif command == 'NOTICE' and rest.startswith('You are now identified'):
            self.push('JOIN %s' % ','.join(self.channels))

        self.reset_alarm()

    def push(self, message):
        try:
            self.log.debug('>> %s' % message)
            msg = (message + self.myterminator).encode()
            self.log.debug('>> %s' % msg)
            asychat.push(self, msg)
        except Exception as e:
            self.log.error("Exception durin push {}".format(e))
            pass

    def disconnect(self):
        self.push('QUIT')
        self.close()

    def reconnect(self):
        if self.connected:
            self.push('QUIT')
        self.close()
        self.create_socket(AF_INET, SOCK_STREAM)
        self.connect((self.server, self.port))

    def handle_connect(self):
        self.push('NICK %s' % self.nickname)
        self.push('USER %s %s %s :%s' %
                  (self.username, self.hostname, self.server, self.realname))

    def handle_disconnect(self):
        if self.retry:
            self.reconnect()
        else:
            self.log.error('No retry set, giving up')

    def PRIVMSG(self, target, text):
        for line in self.wrapper.wrap(text):
            msg = 'PRIVMSG %s :%s' % (','.join(target), line)
            self.log.info(msg)
            self.push(msg)
            sleep(1)

    def ME(self, target, text):
        self.PRIVMSG(target, ('ACTION ' + text + ''))

    def on_welcome(self, prefix, command, params, rest):
        if self.nickserv_password:
            self.push(f'PRIVMSG nickserv :IDENTIFY {self.nickserv_password}')
        self.push('JOIN %s' % ','.join(self.channels))

    def on_kick(self, prefix, command, params, rest):
        self.log.debug(params)
        if params[-1] == self.nickname:
            for chan in params[:-1]:
                self.channels.remove(chan)

    def on_join(self, prefix, command, params, rest):
        pass

    def on_ping(self, prefix, command, params, rest):
        pass

    def on_privmsg(self, prefix, command, params, rest):
        pass

    def on_invite(self, prefix, command, params, rest):
        pass

    def on_nickinuse(self, prefix, command, params, rest):
        regex = search('(\d+)$', self.nickname)
        if regex:
            theint = int(regex.group(0))
            self.nickname = self.nickname.strip(str(theint)) + str(theint + 1)
        else:
            self.nickname = self.nickname + '0'
        self.handle_connect()