#!/usr/bin/env python3
""" usage:
        reaktor (get-config|run) [CONFIG]

    `get-config`    writes the reaktor configuration to stdout
                    if CONFIG is not given it will write the
                    reaktor default config.

                    use this for creating your own config


"""
import logging
import logging.handlers
import os
import threading
from asyncore import loop
from os.path import dirname
from re import match

import reaktor
from reaktor.getconf import make_getconf
from reaktor.ircasy import asybot
from reaktor.translate_colors import translate_colors

default_config = dirname(reaktor.__file__)+'/config.py'

log = logging.getLogger('Reaktor')


class Reaktor(asybot):
    def __init__(self, config=default_config, getconf=None):
        self.config = config

        if not getconf:
            self.getconf = make_getconf(self.conf)
        else:
            self.getconf = getconf
        log.info("using config file %s" % (config))

        asybot.__init__(
            self,
            getconf('irc_server'),
            getconf('irc_port'),
            getconf('irc_nickname'),
            getconf('irc_channels'),
            hammer_interval=getconf('irc_hammer_interval'),
            alarm_timeout=getconf('irc_alarm_timeout'),
            kill_timeout=getconf('irc_kill_timeout'),
            nickserv_password=getconf('nickserv_password'),
        )

    def is_admin(self, prefix):
        try:
            with open(self.getconf('auth_file')) as f:
                for line in f:
                    if line.strip() == prefix:
                        return True
        except Exception as e:
            log.info(e)
        return False

    def on_join(self, prefix, command, params, rest):
        for command in self.getconf('on_join', []):
            thread = threading.Thread(
                target=self.execute_command,
                args=(command, None, prefix, params),
            )
            thread.start()

    def on_ping(self, prefix, command, params, rest):
        for command in self.getconf('on_ping', []):
            prefix = '!'  # => env = { _prefix: '!', _from: '' }
            # TODO why don't we get a list here and use ','.join() ?
            params = command.get('targets')
            thread = threading.Thread(
                target=self.execute_command,
                args=(command, None, prefix, params),
            )
            thread.start()

    def on_privmsg(self, prefix, command, params, rest):
        if not (self.nickname == self.getconf('name')):
                # reload config if the name changed
                # TODO: this sucks, use another sidechannel to tell config the
                # new nickname
            log.debug("nickname differs ('{}' to '{}')".format(
                self.nickname, self.getconf('name')))

            os.environ['REAKTOR_NICKNAME'] = self.nickname
            self.getconf = make_getconf(self.config)
            log.info('nickname changed to {}'.format(self.getconf('name')))

        for command in self.getconf('commands'):
            y = match(command['pattern'], rest)
            if y:
                if not self.is_admin(prefix):
                    self.PRIVMSG(params, 'unauthorized!')
                else:
                    thread = threading.Thread(
                        target=self.execute_command,
                        args=(command, y, prefix, params),
                    )
                    thread.start()

        for command in self.getconf('public_commands'):
            y = match(command['pattern'], rest)
            if y:
                thread = threading.Thread(
                    target=self.execute_command,
                    args=(command, y, prefix, params),
                )
                thread.start()

    def execute_command(self, command, match, prefix, target):
        from os.path import realpath, dirname, join
        from subprocess import Popen as popen, PIPE
        from time import time

        # TODO: allow only commands below ./commands/
        exe = join(dirname(realpath(dirname(__file__))), command['argv'][0])
        myargv = [exe] + command['argv'][1:]
        try:
            if match and match.groupdict().get('args', None):
                myargv += [match.groupdict()['args']]
        except Exception as e:
            log.info("cannot parse args!: {}".format(e))

        cwd = self.getconf('workdir')
        if not os.access(cwd, os.W_OK):
            log.error(
                "Workdir '%s' is not Writable! Falling back to root dir" % cwd)
            cwd = "/"

        env = {}

        env.update(os.environ)  # first merge os.environ
        env.update(command.get('env', {}))  # then env of cfg

        env['_prefix'] = prefix
        env['_from'] = prefix.split('!', 1)[0]

        log.debug('self:' + self.nickname)
        # when receiving /query, answer to the user, not to self
        if self.nickname in target:
            target.remove(self.nickname)
            target.append(env['_from'])
        log.debug('target:' + str(target))

        start = time()
        try:
            log.debug("Running : %s" % str(myargv))
            log.debug("Environ : %s" % (str(env)))
            p = popen(myargv, bufsize=1, stdout=PIPE,
                      stderr=PIPE, env=env, cwd=cwd)
        except Exception as error:
            self.ME(target, 'brain damaged')
            log.error('OSError@%s: %s' % (myargv, error))
            return
        pid = p.pid
        for line in iter(p.stdout.readline, ''.encode()):
            try:
                self.PRIVMSG(target, translate_colors(line.decode()))
            except Exception as error:
                log.error('no send: %s' % error)
            log.debug('%s stdout: %s' % (pid, line))
        p.wait()
        elapsed = time() - start
        code = p.returncode
        log.info('command: %s -> %s in %d seconds' % (myargv, code, elapsed))
        [log.debug('%s stderr: %s' % (pid, x)) for x in p.stderr.readlines()]

        if code != 0:
            self.ME(target, 'mimimi')


def main():
    from docopt import docopt
    args = docopt(__doc__)
    conf = args['CONFIG'] if args['CONFIG'] else default_config
    getconf = make_getconf(conf)
    logging.basicConfig(level=logging.DEBUG if getconf('debug') else
                        logging.INFO)
    log.debug("Debug enabled")

    if args['run']:
        Reaktor(conf, getconf)
        loop()
    elif args['get-config']:
        print(open(conf).read())


if __name__ == "__main__":
    main()