# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
#
# SPDX-License-Identifier: MPL-2.0
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0.  If a copy of the MPL was not distributed with this
# file, you can obtain one at https://mozilla.org/MPL/2.0/.
#
# See the COPYRIGHT file distributed with this work for additional
# information regarding copyright ownership.

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):
        if not zone.endswith("."):
            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.fullname != zone:  # shouldn't ever happen
                continue
            keyname = key.name if zone != "." else "."
            self._keydict[keyname][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