#!/usr/bin/python3.7
# -*-python-*-
# This file is part of avahi.
#
# avahi is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.
#
# avahi 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 Lesser General Public
# License along with avahi; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
# USA.

try:
    import anydbm as dbm
except ImportError:
    import dbm

import locale
import re

locale.setlocale(locale.LC_ALL, '')

class ServiceTypeDatabase:
    """ServiceTypeDatabase maps service types to descriptions"""

    def __init__(self, filename = "/usr/lib64/avahi/service-types.db"):

        self.db = dbm.open(filename, "r")

        l = locale.getlocale(locale.LC_MESSAGES)

        self.suffixes = ()

        if not l[0] is None:

            if not l[1] is None:
                self.suffixes += (l[0] + "@" + l[1], )

            self.suffixes += (l[0], )

            i = l[0].find("_")

            if i >= 0:

                k = l[0][:i]

                if not l[1] is None:
                    self.suffixes += (k + "@" + l[1], )

                self.suffixes += (k, )


        self.suffixes = tuple(map(lambda x:  "["+x+"]", self.suffixes)) + ("", )

    def __getitem__(self, key):

        for suffix in self.suffixes:
            try:
                return self.db[key + suffix]
            except KeyError:
                pass

        raise KeyError()

    def items(self):

        return list(self.iteritems())

    def has_key(self, key):

        for suffix in self.suffixes:

            if self.db.has_key(key + suffix):
                return True

        return False

    def __contains__(self, item):

        for suffix in self.suffixes:

            if item+suffix in self.db:
                return True

        return False


    def __iter__(self):

        def want_key(key):
            if not re.search('_[a-zA-Z0-9-]+\._[a-zA-Z0-9-]+', key):
                return False
            if re.search('_[a-zA-Z0-9-]+\._[a-zA-Z0-9-]+\[.*\]', key):
                return False
            return True

        try:
            key = self.db.firstkey()
        except AttributeError:
            for key in self.db.keys():
                if want_key(key):
                    yield key
        else:
            while key is not None:
                if want_key(key):
                    yield key
                key = self.db.nextkey(key)

    def __len__(self):

        count = 0
        for _ in self:

            count+=1

        self.__len__ = lambda : count
        return len(self)

    def get(self, key, default=None):

        if key in self:
            return self[key]
        else:
            return default

    def iteritems(self):

        return ((key, self[key]) for key in self)

    def iterkeys(self):

        return self.__iter__()

    def itervalues(self):

        return (self[key] for key in self)

    def keys(self):

        return list(self)

    def values(self):

        return list(self.itervalues())

if __name__ == "__main__":

    b = ServiceTypeDatabase()
    print (b.items())

    print (b["_http._tcp"])
    print (b["_ftp._tcp"])
    print (b["_webdav._tcp"])
    print (b["_webdavs._tcp"])

    print (b.get("gurki._tcp"))
    print (len(b))

    for key, _ in zip(b, xrange(3)):

        print (key)

    for key, _ in zip(b.iteritems(), xrange(3)):

        print (key)

    for key, _ in zip(b.itervalues(), xrange(3)):

        print (key)
