# Karma - handle karma (++ and --) tracking
# Copyright (C) 2010  Brian S. Stephan
#
# 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/>.

import re

from Module import Module

__author__ = "Mike Bloy <mike@bloy.org>"
__date__ = "$Oct 23, 2010 11:12:33 AM$"

class Karma(Module):

    def __init__(self, config, server, modlist):
        """
        Upon creation, determine the save file location
        """

        Module.__init__(self, config, server, modlist)

        pattern = "([a-zA-Z0-9_]+)"
        karmapattern = '^' + pattern + '(\+\+|--)'
        querypattern = '^!rank\s+' + pattern

        self.karmare = re.compile(karmapattern)
        self.queryre = re.compile(querypattern)

        # need to init the database if karma tables don't already exist
        version = self.db_module_registered(self.__class__.__name__)
        if (version == None):
            # have to create the database tables
            conn = self.get_db()
            try:
                conn.execute('''
                   CREATE TABLE karma_log (
                        id INTEGER PRIMARY KEY AUTOINCREMENT,
                        key TEXT NOT NULL,
                        delta INTEGER NOT NULL,
                        who TEXT NOT NULL,
                        userhost TEXT NOT NULL,
                        karmatime TEXT DEFAULT CURRENT_TIMESTAMP
                    )''')
                conn.execute('CREATE INDEX karma_log_key_ix ON karma_log (key)')
                conn.execute('CREATE INDEX karma_log_who_ix ON karma_log (who)')
                conn.execute('''
                    CREATE VIEW karma_values AS
                    SELECT key, SUM(delta) AS value
                    FROM karma_log
                    GROUP BY key''')
                
                sql = 'INSERT INTO drbotzo_modules VALUES (?,?)'
                conn.execute(sql, (self.__class__.__name__, 1))
                conn.commit()
            finally: conn.close()

    def do(self, connection, event, nick, userhost, replypath, what, admin_unlocked):
        """look for karma strings at the start of messages"""
        
        if (self.karmare.match(what)):
            self.handle_karma_change(connection, nick, userhost, replypath, what)
            
        elif (self.queryre.match(what)):
            self.handle_karma_query(connection, nick, userhost, replypath, what)

    def handle_karma_change(self, connection, nick, userhost, replypath, what):
        """
        handle the karma change and storage.
        """
        match = self.karmare.match(what)
        key = match.group(1)
        value = match.group(2)
        if (value == '++'):
            value = 1;
        else:
            value = -1;

        conn = self.get_db()
        try:
            sql = '''
            INSERT INTO karma_log (key, delta, who, userhost)
            VALUES (?, ?, ?, ?)
            '''
            conn.execute(sql, (key, value, nick, userhost))
            conn.commit()
        finally: conn.close()

        reply = "karma change for '" + key + "' (" + str(value) + ") by " + nick
        self.reply(connection, replypath, reply)

    def handle_karma_query(self, connection, nick, userhost, replypath, what):
        match = self.queryre.match(what)
        key = match.group(1)

        conn = self.get_db()
        reply = '{nick}: {key} has no karma'.format(nick=nick, key=key)
        try:
            query = '''
            SELECT value
            FROM karma_values
            WHERE key = :key
            '''
            value = conn.execute(query, {'key': key}).fetchone()
            if (value != None):
                reply = '{nick}: {key} has {value[0]!s} points of karma'.format(nick=nick, key=key, value=value)
       
        finally: conn.close()

        self.reply(connection, replypath, reply)

if __name__ == "__main__":
    print "Hello World"