# Copyright © 2016, 2018 Bruce Cowan <bruce@bcowan.eu>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from collections import defaultdict
import re

from errbot import BotPlugin, botcmd, re_botcmd


class Karma(BotPlugin):
    """Karma service"""

    def activate(self):
        super().activate()

        self.karma = self.get('karma', defaultdict(int))

    def deactivate(self):
        self['karma'] = self.karma

        super().deactivate()

    def _change_karma(self, target, value, message):
        self.karma[target] += value
        return "Karma for '{}' is now {}".format(target, self.karma[target])

    @re_botcmd(pattern=r'(.+)\+\+', prefixed=False, flags=re.IGNORECASE)
    def on_karma_inc(self, message, match):
        """Adds karma"""
        if message.frm == self.bot_identifier:
            return

        return self._change_karma(match.group(1), 1, message)

    @re_botcmd(pattern=r'(.+)--', prefixed=False, flags=re.IGNORECASE)
    def on_karma_dec(self, message, match):
        """Removes karma"""
        if message.frm == self.bot_identifier:
            return

        return self._change_karma(match.group(1), -1, message)

    @botcmd
    def karma(self, message, args):
        """Gets karma"""
        if not args:
            return "**Usage**: !karma <target>"

        return "Karma for '{}' is {}".format(args, self.karma[args])

    def _get_num_from_args(self, args):
        try:
            num = int(args[0])
            return num
        except ValueError:
            return None
        except IndexError:
            return 5

    @botcmd
    def karma_top(self, message, args):
        """Gets the top 5 karmaed items"""
        if not self.karma:
            return "There are no karmaed items"

        num = self._get_num_from_args(args)
        if not num:
            return "**Error**: Couldn't convert to an integer"

        keys = sorted(self.karma, key=self.karma.get, reverse=True)[:num]
        values = sorted(self.karma.values(), reverse=True)[:num]

        return ", ".join(["{}: {}".format(k, v) for k, v in zip(keys, values)])

    @botcmd
    def karma_bottom(self, message, args):
        """Gets the bottom 5 karmaed items"""
        if not self.karma:
            return "There are no karmaed items"

        num = self._get_num_from_args(args)
        if not num:
            return "**Error**: Couldn't convert to an integer"

        keys = sorted(self.karma, key=self.karma.get)[:num]
        values = sorted(self.karma.values())[:num]

        return ", ".join(["{}: {}".format(k, v) for k, v in zip(keys, values)])