# -*- coding: utf-8  -*-
#
# Copyright (C) 2009-2015 Ben Kurtovic <ben.kurtovic@gmail.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

__all__ = ["Command"]

class Command:
    """
    **EarwigBot: Base IRC Command**

    This package provides built-in IRC "commands" used by the bot's front-end
    component. Additional commands can be installed as plugins in the bot's
    working directory.

    This class (import with ``from earwigbot.commands import Command``), can be
    subclassed to create custom IRC commands.

    This docstring is reported to the user when they type ``"!help
    <command>"``.
    """
    # The command's name, as reported to the user when they use !help:
    name = None

    # A list of names that will trigger this command. If left empty, it will
    # be triggered by the command's name and its name only:
    commands = []

    # Hooks are "msg", "msg_private", "msg_public", "join", "part", and "rc".
    # "msg" is the default behavior; if you wish to override that, change the
    # value in your command subclass:
    hooks = ["msg"]

    def __init__(self, bot):
        """Constructor for new commands.

        This is called once when the command is loaded (from
        :py:meth:`commands.load() <earwigbot.managers._ResourceManager.load>`).
        *bot* is out base :py:class:`~earwigbot.bot.Bot` object. Don't override
        this directly; if you do, remember to place ``super().__init()`` first.
        Use :py:meth:`setup` for typical command-init/setup needs.
        """
        self.bot = bot
        self.config = bot.config
        self.logger = bot.commands.logger.getChild(self.name)

        # Convenience functions:
        self.say = lambda target, msg, hidelog=False: self.bot.frontend.say(target, msg, hidelog)
        self.reply = lambda data, msg, hidelog=False: self.bot.frontend.reply(data, msg, hidelog)
        self.action = lambda target, msg, hidelog=False: self.bot.frontend.action(target, msg, hidelog)
        self.notice = lambda target, msg, hidelog=False: self.bot.frontend.notice(target, msg, hidelog)
        self.join = lambda chan, hidelog=False: self.bot.frontend.join(chan, hidelog)
        self.part = lambda chan, msg=None, hidelog=False: self.bot.frontend.part(chan, msg, hidelog)
        self.mode = lambda t, level, msg, hidelog=False: self.bot.frontend.mode(t, level, msg, hidelog)
        self.ping = lambda target, hidelog=False: self.bot.frontend.ping(target, hidelog)
        self.pong = lambda target, hidelog=False: self.bot.frontend.pong(target, hidelog)

        self.setup()

    def __repr__(self):
        """Return the canonical string representation of the Command."""
        res = "Command(name={0!r}, commands={1!r}, hooks={2!r}, bot={3!r})"
        return res.format(self.name, self.commands, self.hooks, self.bot)

    def __str__(self):
        """Return a nice string representation of the Command."""
        return "<Command {0} of {1}>".format(self.name, self.bot)

    def setup(self):
        """Hook called immediately after the command is loaded.

        Does nothing by default; feel free to override.
        """
        pass

    def check(self, data):
        """Return whether this command should be called in response to *data*.

        Given a :py:class:`~earwigbot.irc.data.Data` instance, return ``True``
        if we should respond to this activity, or ``False`` if we should ignore
        it and move on. Be aware that since this is called for each message
        sent on IRC, it should be cheap to execute and unlikely to throw
        exceptions.

        Most commands return ``True`` only if :py:attr:`data.command
        <earwigbot.irc.data.Data.command>` ``==`` :py:attr:`self.name <name>`,
        or :py:attr:`data.command <earwigbot.irc.data.Data.command>` is in
        :py:attr:`self.commands <commands>` if that list is overriden. This is
        the default behavior; you should only override it if you wish to change
        that.
        """
        if self.commands:
            return data.is_command and data.command in self.commands
        return data.is_command and data.command == self.name

    def process(self, data):
        """Main entry point for doing a command.

        Handle an activity (usually a message) on IRC. At this point, thanks
        to :py:meth:`check` which is called automatically by the command
        handler, we know this is something we should respond to. Place your
        command's body here.
        """
        pass

    def unload(self):
        """Hook called immediately before a command is unloaded.

        Does nothing by default; feel free to override.
        """
        pass
