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from webkitpy.tool.bot.queueengine import TerminateQueue
from webkitpy.tool.bot.irc_command import IRCCommand
from webkitpy.common.net.irc.ircbot import IRCBotDelegate
from webkitpy.common.thread.threadedmessagequeue import ThreadedMessageQueue


class _IRCThreadTearoff(IRCBotDelegate):
    def __init__(self, name, password, message_queue, wakeup_event):
        self._name = name
        self._password = password
        self._message_queue = message_queue
        self._wakeup_event = wakeup_event

    # IRCBotDelegate methods

    def irc_message_received(self, nick, message):
        self._message_queue.post([nick, message])
        self._wakeup_event.set()

    def irc_nickname(self):
        return self._name

    def irc_password(self):
        return self._password


class UnknownCommand(IRCCommand):
    def execute(self, nick, args, tool, sheriff):
        return "%s: %s" % (nick, "...")


class IRCBot(object):
    def __init__(self, name, tool, agent, commands):
        self._name = name
        self._tool = tool
        self._agent = agent
        self._message_queue = ThreadedMessageQueue()
        self._commands = commands

    def irc_delegate(self):
        return _IRCThreadTearoff(self._name, self._tool.irc_password,
            self._message_queue, self._tool.wakeup_event)

    def _parse_command_and_args(self, request):
        tokenized_request = request.strip().split(" ")
        command = self._commands.get(tokenized_request[0])
        args = tokenized_request[1:]
        if not command:
            # Give the peoples someone to talk with.
            command = UnknownCommand
            args = tokenized_request
        return (command, args)

    def process_message(self, requester_nick, request):
        command, args = self._parse_command_and_args(request)
        try:
            response = command().execute(requester_nick, args, self._tool, self._agent)
            if response:
                self._tool.irc().post(response)
        except TerminateQueue:
            raise
        # This will catch everything else. SystemExit and KeyboardInterrupt are not subclasses of Exception, so we won't catch those.
        except Exception as e:
            self._tool.irc().post("Exception executing command: %s" % e)

    def process_pending_messages(self):
        (messages, is_running) = self._message_queue.take_all()
        for message in messages:
            (nick, request) = message
            self.process_message(nick, request)