nxy/bot/mcmaniac.py

# -*- coding: utf-8 -*-
import irc3
from docopt import Dict
from irc3.plugins.command import command
from irc3.utils import IrcString
from psycopg2 import Error

from . import DatabasePlugin
from .utils import parse_int


class McManiac(DatabasePlugin):
    @command(options_first=True)
    def mcmaniac(self, mask: IrcString, target: IrcString, args: Dict):
        """Get a random McManiaC or by index.

        %%mcmaniac [<index>]
        """
        index = args.get('<index>')

        if index:
            index = parse_int(index)
            if not index:
                return
            index, order = index
            order = 'id {order}'.format(order=order)
            offset = 'offset %s'
        else:
            order = 'random()'
            offset = ''

        # Fetch result from database
        self.cur.execute('''
        select
          item,
          rank() over (order by id),
          count(*) over (rows between unbounded preceding
                                  and unbounded following) as total
        from
          mcmaniacs
        order by
          {order}
        limit
          1
        {offset}
        '''.format(order=order, offset=offset), [index])
        result = self.cur.fetchone()

        if result:
            return '[{rank}/{total}] {item}'.format(**result)

    # TODO: fix regex ("McFooiaC McBariaC" adds "Mc\S+iaC")
    @irc3.event(r'^:(?P<mask>\S+) PRIVMSG \S+ :.*(?P<item>Mc\S+iaC).*')
    def save(self, mask: str, item: str):
        if IrcString(mask).nick != self.bot.nick:
            try:
                # Insert into database
                self.cur.execute('''
                INSERT INTO
                  mcmaniacs (item)
                VALUES
                  (%s)
                ''', [item])
                self.con.commit()
            except Error:
                # Rollback transaction on error
                self.con.rollback()