############################################################################
# Copyright (C) 2016  Internet Systems Consortium, Inc. ("ISC")
#
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
# OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
# PERFORMANCE OF THIS SOFTWARE.
############################################################################

from collections import defaultdict
from . import dnskey
import os
import glob


########################################################################
# Class keydict
########################################################################
class keydict:
    """ A dictionary of keys, indexed by name, algorithm, and key id """

    _keydict = defaultdict(lambda: defaultdict(dict))
    _defttl = None
    _missing = []

    def __init__(self, dp=None, **kwargs):
        self._defttl = kwargs.get('keyttl', None)
        zones = kwargs.get('zones', None)

        if not zones:
            path = kwargs.get('path',None) or '.'
            self.readall(path)
        else:
            for zone in zones:
                if 'path' in kwargs and kwargs['path'] is not None:
                    path = kwargs['path']
                else:
                    path = dp and dp.policy(zone).directory or '.'
                if not self.readone(path, zone):
                    self._missing.append(zone)

    def readall(self, path):
        files = glob.glob(os.path.join(path, '*.private'))

        for infile in files:
            key = dnskey(infile, path, self._defttl)
            self._keydict[key.name][key.alg][key.keyid] = key

    def readone(self, path, zone):
        match='K' + zone + '.+*.private'
        files = glob.glob(os.path.join(path, match))

        found = False
        for infile in files:
            key = dnskey(infile, path, self._defttl)
            if key.name != zone: # shouldn't ever happen
                continue
            self._keydict[key.name][key.alg][key.keyid] = key
            found = True

        return found

    def __iter__(self):
        for zone, algorithms in self._keydict.items():
            for alg, keys in algorithms.items():
                for key in keys.values():
                    yield key

    def __getitem__(self, name):
        return self._keydict[name]

    def zones(self):
        return (self._keydict.keys())

    def algorithms(self, zone):
        return (self._keydict[zone].keys())

    def keys(self, zone, alg):
        return (self._keydict[zone][alg].keys())

    def missing(self):
        return (self._missing)