# Copyright (c) 2014 The Johns Hopkins University/Applied Physics Laboratory
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.

from kmip.core import enums

from kmip.core.enums import Tags

from kmip.core.errors import ErrorStrings

from kmip.core.primitives import Struct
from kmip.core.primitives import Integer
from kmip.core.primitives import Enumeration
from kmip.core.primitives import TextString

from kmip.core.utils import BytearrayStream
from enum import Enum


# 3.1
class UniqueIdentifier(TextString):

    def __init__(self, value=None):
        super(self.__class__, self).__init__(value,
                                             Tags.UNIQUE_IDENTIFIER)


# 3.2
class Name(Struct):

    class NameValue(TextString):

        def __init__(self, value=None):
            super(self.__class__, self).__init__(value, Tags.NAME_VALUE)

    class NameType(Enumeration):

        ENUM_TYPE = enums.NameType

        def __init__(self, value=None):
            super(self.__class__, self).__init__(value, Tags.NAME_TYPE)

    def __init__(self, name_value=None, name_type=None):
        super(self.__class__, self).__init__(tag=Tags.NAME)
        self.name_value = name_value
        self.name_type = name_type
        self.validate()

    def read(self, istream):
        super(self.__class__, self).read(istream)
        tstream = BytearrayStream(istream.read(self.length))

        # Read the value and type of the name
        self.name_value = Name.NameValue()
        self.name_type = Name.NameType()
        self.name_value.read(tstream)
        self.name_type.read(tstream)

        self.is_oversized(tstream)

    def write(self, ostream):
        tstream = BytearrayStream()

        # Write the value and type of the name
        self.name_value.write(tstream)
        self.name_type.write(tstream)

        # Write the length and value of the template attribute
        self.length = tstream.length()
        super(self.__class__, self).write(ostream)
        ostream.write(tstream.buffer)

    def validate(self):
        self.__validate()

    def __validate(self):
        # TODO (peter-hamilton) Finish implementation.
        pass

    @classmethod
    def create(cls, name_value, name_type):
        if isinstance(name_value, Name.NameValue):
            value = name_value
        elif isinstance(name_value, str):
            value = cls.NameValue(name_value)

        if isinstance(name_type, Name.NameType):
            n_type = name_type
        elif isinstance(name_type, Enum):
            n_type = cls.NameType(name_type)

        return Name(name_value=value,
                    name_type=n_type)


# 3.3
class ObjectType(Enumeration):

    ENUM_TYPE = enums.ObjectType

    def __init__(self, value=None):
        super(self.__class__, self).__init__(value, Tags.OBJECT_TYPE)


# 3.4
class CryptographicAlgorithm(Enumeration):

    ENUM_TYPE = enums.CryptographicAlgorithm

    def __init__(self, value=None):
        super(self.__class__, self).__init__(value,
                                             Tags.CRYPTOGRAPHIC_ALGORITHM)


# 3.5
class CryptographicLength(Integer):

    def __init__(self, value=None):
        super(self.__class__, self).__init__(value,
                                             Tags.CRYPTOGRAPHIC_LENGTH)


# 3.6
class CryptographicParameters(Struct):

    class BlockCipherMode(Enumeration):
        ENUM_TYPE = enums.BlockCipherMode

        def __init__(self, value=None):
            super(self.__class__, self).__init__(value,
                                                 Tags.BLOCK_CIPHER_MODE)

    class PaddingMethod(Enumeration):
        ENUM_TYPE = enums.PaddingMethod

        def __init__(self, value=None):
            super(self.__class__, self).__init__(value,
                                                 Tags.PADDING_METHOD)

    class HashingAlgorithm(Enumeration):
        ENUM_TYPE = enums.HashingAlgorithm

        def __init__(self, value=None):
            super(self.__class__, self).__init__(value,
                                                 Tags.HASHING_ALGORITHM)

    class KeyRoleType(Enumeration):
        ENUM_TYPE = enums.KeyRoleType

        def __init__(self, value=None):
            super(self.__class__, self).__init__(value,
                                                 Tags.KEY_ROLE_TYPE)

    def __init__(self,
                 block_cipher_mode=None,
                 padding_method=None,
                 hashing_algorithm=None,
                 key_role_type=None):
        super(self.__class__, self).__init__(tag=Tags.CRYPTOGRAPHIC_PARAMETERS)
        self.block_cipher_mode = block_cipher_mode
        self.padding_method = padding_method
        self.hashing_algorithm = hashing_algorithm
        self.key_role_type = key_role_type

    def read(self, istream):
        super(self.__class__, self).read(istream)
        tstream = BytearrayStream(istream.read(self.length))

        if self.is_tag_next(Tags.BLOCK_CIPHER_MODE, tstream):
            self.block_cipher_mode = CryptographicParameters.BlockCipherMode()
            self.block_cipher_mode.read(tstream)

        if self.is_tag_next(Tags.PADDING_METHOD, tstream):
            self.padding_method = CryptographicParameters.PaddingMethod()
            self.padding_method.read(tstream)

        if self.is_tag_next(Tags.HASHING_ALGORITHM, tstream):
            self.hashing_algorithm = CryptographicParameters.HashingAlgorithm()
            self.hashing_algorithm.read(tstream)

        if self.is_tag_next(Tags.KEY_ROLE_TYPE, tstream):
            self.key_role_type = CryptographicParameters.KeyRoleType()
            self.key_role_type.read(tstream)

        self.is_oversized(tstream)
        self.validate()

    def write(self, ostream):
        tstream = BytearrayStream()

        # Write the contents of the request payload
        if self.block_cipher_mode is not None:
            self.block_cipher_mode.write(tstream)
        if self.padding_method is not None:
            self.padding_method.write(tstream)
        if self.hashing_algorithm is not None:
            self.hashing_algorithm.write(tstream)
        if self.key_role_type is not None:
            self.key_role_type.write(tstream)

        # Write the length and value of the request payload
        self.length = tstream.length()
        super(self.__class__, self).write(ostream)
        ostream.write(tstream.buffer)

    def validate(self):
        self.__validate()

    def __validate(self):
        # TODO (peter-hamilton) Finish implementation.
        pass


# 3.8
class CertificateType(Enumeration):
    ENUM_TYPE = enums.CertificateType

    def __init__(self, value=None):
        super(self.__class__, self).__init__(value,
                                             Tags.CERTIFICATE_TYPE)


# 3.19
class CryptographicUsageMask(Integer):

    ENUM_TYPE = enums.CryptographicUsageMask

    def __init__(self, value=None):
        super(self.__class__, self).__init__(value,
                                             Tags.CRYPTOGRAPHIC_USAGE_MASK)


# 3.33
class ObjectGroup(TextString):

    def __init__(self, value=None):
        super(self.__class__,
              self).__init__(value, Tags.OBJECT_GROUP)


# 3.36
class ApplicationSpecificInformation(Struct):

    class ApplicationNamespace(TextString):

        def __init__(self, value=None):
            super(self.__class__,
                  self).__init__(value, Tags.APPLICATION_NAMESPACE)

    class ApplicationData(TextString):

        def __init__(self, value=None):
            super(self.__class__,
                  self).__init__(value, Tags.APPLICATION_DATA)

    def __init__(self, application_namespace=None,
                 application_data=None):
        super(self.__class__,
              self).__init__(Tags.APPLICATION_SPECIFIC_INFORMATION)

        self.application_namespace = application_namespace
        self.application_data = application_data

        self.validate()

    def read(self, istream):
        super(self.__class__, self).read(istream)
        tstream = BytearrayStream(istream.read(self.length))

        self.application_namespace = self.ApplicationNamespace()
        self.application_data = self.ApplicationData()

        self.application_namespace.read(tstream)
        self.application_data.read(tstream)

        self.is_oversized(tstream)
        self.validate()

    def write(self, ostream):
        tstream = BytearrayStream()

        self.application_namespace.write(tstream)
        self.application_data.write(tstream)

        # Write the length and value of the request payload
        self.length = tstream.length()
        super(self.__class__, self).write(ostream)
        ostream.write(tstream.buffer)

    def validate(self):
        self.__validate()

    def __validate(self):
        name = self.__class__.__name__
        msg = ErrorStrings.BAD_EXP_RECV

        if self.application_namespace is not None:
            if self.application_data is None:
                member = 'application_data'
                raise ValueError(msg.format('{}.{}'.format(name, member),
                                            'value', 'not None', 'None'))
            else:
                member = 'application_namespace'
                exp_type = self.ApplicationNamespace
                if not isinstance(self.application_namespace, exp_type):
                    rcv_type = type(self.application_namespace)
                    raise TypeError(msg.format('{}.{}'.format(name, member),
                                               'type', exp_type, rcv_type))

        if self.application_data is not None:
            if self.application_namespace is None:
                member = 'application_namespace'
                raise ValueError(msg.format('{}.{}'.format(name, member),
                                            'value', 'not None', 'None'))
            else:
                member = 'application_data'
                exp_type = self.ApplicationData
                if not isinstance(self.application_data, exp_type):
                    rcv_type = type(self.application_data)
                    raise TypeError(msg.format('{}.{}'.format(name, member),
                                               'type', exp_type, rcv_type))

    @classmethod
    def create(cls, application_namespace, application_data):
        namespace = ApplicationSpecificInformation.\
            ApplicationNamespace(application_namespace)
        data = ApplicationSpecificInformation.\
            ApplicationData(application_data)
        return ApplicationSpecificInformation(application_namespace=namespace,
                                              application_data=data)


# 3.37
class ContactInformation(TextString):

    def __init__(self, value=None):
        super(self.__class__,
              self).__init__(value, Tags.CONTACT_INFORMATION)


# 3.39
# TODO (peter-hamilton) A CustomAttribute TextString is not sufficient to
# TODO (peter-hamilton) cover all potential custom attributes. This is a
# TODO (peter-hamilton) temporary stopgap.
class CustomAttribute(TextString):

    def __init__(self, value=None):
        super(self.__class__,
              self).__init__(value, Tags.ATTRIBUTE_VALUE)