#!/usr/bin/env python

###
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"""
The Lookup plugin handles looking up various values by their key.
"""

__revision__ = "$Id$"

import supybot.plugins as plugins

import os
import re
import sys
import sets
import getopt
import string

import supybot.conf as conf
import supybot.utils as utils
import supybot.privmsgs as privmsgs
import supybot.registry as registry
import supybot.callbacks as callbacks

try:
    import sqlite
except ImportError:
    raise callbacks.Error, 'You need to have PySQLite installed to use this ' \
                           'plugin.  Download it at <http://pysqlite.sf.net/>'

def configure(advanced):
    from supybot.questions import output, expect, anything, something, yn
    conf.registerPlugin('Lookup', True)
    lookups = conf.supybot.plugins.Lookup.lookups
    output("""This module allows you to define commands that do a simple key
              lookup and return some simple value.  It has a command "add"
              that takes a command name and a file from the data dir and adds a
              command with that name that responds with the mapping from that
              file. The file itself should be composed of lines
              of the form key:value.""")
    while yn('Would you like to add a file?'):
        filename = something('What\'s the filename?')
        try:
            fd = file(filename)
        except EnvironmentError, e:
            output('I couldn\'t open that file: %s' % e)
            continue
        counter = 1
        try:
            for line in fd:
                line = line.rstrip('\r\n')
                if not line or line.startswith('#'):
                    continue
                (key, value) = line.split(':', 1)
                counter += 1
        except ValueError:
            output('That\'s not a valid file; '
                   'line #%s is malformed.' % counter)
            continue
        command = something('What would you like the command to be?')
        conf.registerGlobalValue(lookups,command, registry.String(filename,''))


conf.registerPlugin('Lookup')
conf.registerGroup(conf.supybot.plugins.Lookup, 'lookups')

class LookupDB(plugins.DBHandler):
    def makeDb(self, filename):
        return sqlite.connect(filename)

class Lookup(callbacks.Privmsg):
    def __init__(self):
        callbacks.Privmsg.__init__(self)
        self.lookupDomains = sets.Set()
        dataDir = conf.supybot.directories.data()
        self.dbHandler = LookupDB(name=os.path.join(dataDir, 'Lookup'))
        for (name, value) in registry._cache.iteritems():
            name = name.lower()
            if name.startswith('supybot.plugins.lookup.lookups.'):
                name = name[len('supybot.plugins.lookup.lookups.'):]
                if '.' in name:
                    continue
                self.addRegistryValue(name, value)
        group = conf.supybot.plugins.Lookup.lookups
        for (name, value) in group.getValues(fullNames=False):
            name = name.lower() # Just in case.
            filename = value()
            try:
                self.addDatabase(name, filename)
                self.addCommand(name)
            except Exception, e:
                self.log.warning('Couldn\'t add lookup %s: %s', name, e)

    def _shrink(self, s):
        return utils.ellipsisify(s, 50)

    def die(self):
        self.dbHandler.die()

    def remove(self, irc, msg, args):
        """<name>

        Removes the lookup for <name>.
        """
        name = privmsgs.getArgs(args)
        name = callbacks.canonicalName(name)
        if name not in self.lookupDomains:
            irc.error('That\'s not a valid lookup to remove.')
            return
        db = self.dbHandler.getDb()
        cursor = db.cursor()
        try:
            cursor.execute("""DROP TABLE %s""" % name)
            db.commit()
            delattr(self.__class__, name)
            irc.replySuccess()
        except sqlite.DatabaseError:
            irc.error('No such lookup exists.')
    remove = privmsgs.checkCapability(remove, 'admin')

    _splitRe = re.compile(r'(?<!\\):')
    def add(self, irc, msg, args):
        """<name> <filename>

        Adds a lookup for <name> with the key/value pairs specified in the
        colon-delimited file specified by <filename>.  <filename> is searched
        for in conf.supybot.directories.data.  If <name> is not singular, we
        try to make it singular before creating the command.
        """
        (name, filename) = privmsgs.getArgs(args, required=2)
        name = utils.depluralize(name)
        name = callbacks.canonicalName(name)
        if hasattr(self, name):
            s = 'I already have a command in this plugin named %s' % name
            irc.error(s)
            return
        db = self.dbHandler.getDb()
        cursor = db.cursor()
        try:
            cursor.execute("""SELECT * FROM %s LIMIT 1""" % name)
            self.addCommand(name)
        except sqlite.DatabaseError:
            try:
                self.addDatabase(name, filename)
            except EnvironmentError, e:
                irc.error('Could not open %s: %s' % (filename, e.args[1]))
                return
            self.addCommand(name)
        self.addRegistryValue(name, filename)
        irc.replySuccess('Lookup %s added.' % name)
    add = privmsgs.checkCapability(add, 'admin')

    def addRegistryValue(self, name, filename):
        v = registry.String(filename, '')
        conf.supybot.plugins.Lookup.lookups.register(name, v)

    def addDatabase(self, name, filename):
        db = self.dbHandler.getDb()
        cursor = db.cursor()
        dataDir = conf.supybot.directories.data()
        filename = os.path.join(dataDir, filename)
        fd = file(filename)
        try:
            cursor.execute("""SELECT COUNT(*) FROM %s""" % name)
        except sqlite.DatabaseError:
            cursor.execute("CREATE TABLE %s (key TEXT, value TEXT)" % name)
            sql = "INSERT INTO %s VALUES (%%s, %%s)" % name
            for line in utils.nonCommentNonEmptyLines(fd):
                line = line.rstrip('\r\n')
                try:
                    (key, value) = self._splitRe.split(line, 1)
                    key = key.replace('\\:', ':')
                except ValueError:
                    cursor.execute("""DROP TABLE %s""" % name)
                    s = 'Invalid line in %s: %r' % (filename, line)
                    raise callbacks.Error, s
                cursor.execute(sql, key, value)
            cursor.execute("CREATE INDEX %s_keys ON %s (key)" % (name, name))
            db.commit()

    def addCommand(self, name):
        def f(self, irc, msg, args):
            args.insert(0, name)
            self._lookup(irc, msg, args)
        db = self.dbHandler.getDb()
        cursor = db.cursor()
        cursor.execute("""SELECT COUNT(*) FROM %s""" % name)
        rows = int(cursor.fetchone()[0])
        docstring = """[<key>]

        If <key> is given, looks up <key> in the %s database.  Otherwise,
        returns a random key: value pair from the database.  There are
        %s in the database.
        """ % (name, utils.nItems(name, rows))
        f = utils.changeFunctionName(f, name, docstring)
        self.lookupDomains.add(name)
        setattr(self.__class__, name, f)

    _sqlTrans = string.maketrans('*?', '%_')
    def search(self, irc, msg, args):
        """[--{regexp}=<value>] [--values] <name> <glob>

        Searches the domain <name> for lookups matching <glob>.  If --regexp
        is given, its associated value is taken as a regexp and matched
        against the lookups.  If --values is given, search the values rather
        than the keys.
        """
        column = 'key'
        while '--values' in args:
            column = 'value'
            args.remove('--values')
        (options, rest) = getopt.getopt(args, '', ['regexp='])
        (name, globs) = privmsgs.getArgs(rest, optional=1)
        db = self.dbHandler.getDb()
        criteria = []
        formats = []
        predicateName = 'p'
        for (option, arg) in options:
            if option == '--regexp':
                criteria.append('%s(%s)' % (predicateName, column))
                try:
                    r = utils.perlReToPythonRe(arg)
                except ValueError, e:
                    irc.error('%r is not a valid regular expression' %
                              arg)
                    return
                def p(s, r=r):
                    return int(bool(r.search(s)))
                db.create_function(predicateName, 1, p)
                predicateName += 'p'
        for glob in globs.split():
            if '?' not in glob and '*' not in glob:
                glob = '*%s*' % glob
            criteria.append('%s LIKE %%s' % column)
            formats.append(glob.translate(self._sqlTrans))
        if not criteria:
            raise callbacks.ArgumentError
        #print 'criteria: %s' % repr(criteria)
        #print 'formats: %s' % repr(formats)
        cursor = db.cursor()
        sql = """SELECT key, value FROM %s WHERE %s""" % \
              (name, ' AND '.join(criteria))
        #print 'sql: %s' % sql
        cursor.execute(sql, formats)
        if cursor.rowcount == 0:
            irc.reply('No entries in %s matched that query.' % name)
        else:
            lookups = ['%s: %s' % (item[0], self._shrink(item[1]))
                       for item in cursor.fetchall()]
            irc.reply(utils.commaAndify(lookups))

    def _lookup(self, irc, msg, args):
        """<name> <key>

        Looks up the value of <key> in the domain <name>.
        """
        (name, key) = privmsgs.getArgs(args, optional=1)
        db = self.dbHandler.getDb()
        cursor = db.cursor()
        if key:
            sql = """SELECT value FROM %s WHERE key LIKE %%s""" % name
            try:
                cursor.execute(sql, key)
            except sqlite.DatabaseError, e:
                if 'no such table' in str(e):
                    irc.error('I don\'t have a domain %s' % name)
                else:
                    irc.error(str(e))
                return
            if cursor.rowcount == 0:
                irc.error('I couldn\'t find %s in %s.' % (key, name))
            elif cursor.rowcount == 1:
                irc.reply(cursor.fetchone()[0])
            else:
                values = [t[0] for t in cursor.fetchall()]
                irc.reply('%s could be %s' % (key, ', or '.join(values)))
        else:
            sql = """SELECT key, value FROM %s
                     ORDER BY random() LIMIT 1""" % name
            try:
                cursor.execute(sql)
            except sqlite.DatabaseError, e:
                if 'no such table' in str(e):
                    irc.error('I don\'t have a domain %r' % name)
                else:
                    irc.error(str(e))
                return
            (key, value) = cursor.fetchone()
            irc.reply('%s: %s' % (key, value))


Class = Lookup

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