"""
.. module: lemur.schemas
    :platform: unix
    :copyright: (c) 2015 by Netflix Inc., see AUTHORS for more
    :license: Apache, see LICENSE for more details.

.. moduleauthor:: Kevin Glisson <kglisson@netflix.com>

"""
from sqlalchemy.orm.exc import NoResultFound

from marshmallow import fields, post_load, pre_load, post_dump, validates_schema
from marshmallow.exceptions import ValidationError

from lemur.common import validators
from lemur.common.schema import LemurSchema, LemurInputSchema, LemurOutputSchema

from lemur.plugins import plugins
from lemur.roles.models import Role
from lemur.users.models import User
from lemur.authorities.models import Authority
from lemur.certificates.models import Certificate
from lemur.destinations.models import Destination
from lemur.notifications.models import Notification


def get_object_attribute(data, many=False):
    if many:
        ids = [d.get('id') for d in data]
        names = [d.get('name') for d in data]

        if None in ids:
            if None in names:
                raise ValidationError('Associated object require a name or id.')
            else:
                return 'name'
        return 'id'
    else:
        if data.get('id'):
            return 'id'
        elif data.get('name'):
            return 'name'
        else:
            raise ValidationError('Associated object require a name or id.')


def fetch_objects(model, data, many=False):
    attr = get_object_attribute(data, many=many)

    if many:
        values = [v[attr] for v in data]
        items = model.query.filter(getattr(model, attr).in_(values)).all()
        found = [getattr(i, attr) for i in items]
        diff = set(values).symmetric_difference(set(found))

        if diff:
            raise ValidationError('Unable to locate {model} with {attr} {diff}'.format(
                model=model,
                attr=attr,
                diff=",".join(list(diff))))

        return items

    else:
        try:
            return model.query.filter(getattr(model, attr) == data[attr]).one()
        except NoResultFound:
            raise ValidationError('Unable to find {model} with {attr}: {data}'.format(
                model=model,
                attr=attr,
                data=data[attr]))


class AssociatedAuthoritySchema(LemurInputSchema):
    id = fields.Int()
    name = fields.String()

    @post_load
    def get_object(self, data, many=False):
        return fetch_objects(Authority, data, many=many)


class AssociatedRoleSchema(LemurInputSchema):
    id = fields.Int()
    name = fields.String()

    @post_load
    def get_object(self, data, many=False):
        return fetch_objects(Role, data, many=many)


class AssociatedDestinationSchema(LemurInputSchema):
    id = fields.Int()
    name = fields.String()

    @post_load
    def get_object(self, data, many=False):
        return fetch_objects(Destination, data, many=many)


class AssociatedNotificationSchema(LemurInputSchema):
    id = fields.Int()
    name = fields.String()

    @post_load
    def get_object(self, data, many=False):
        return fetch_objects(Notification, data, many=many)


class AssociatedCertificateSchema(LemurInputSchema):
    id = fields.Int()
    name = fields.String()

    @post_load
    def get_object(self, data, many=False):
        return fetch_objects(Certificate, data, many=many)


class AssociatedUserSchema(LemurInputSchema):
    id = fields.Int()
    name = fields.String()

    @post_load
    def get_object(self, data, many=False):
        return fetch_objects(User, data, many=many)


class PluginInputSchema(LemurInputSchema):
    plugin_options = fields.List(fields.Dict())
    slug = fields.String(required=True)
    title = fields.String()
    description = fields.String()

    @post_load
    def get_object(self, data, many=False):
        try:
            data['plugin_object'] = plugins.get(data['slug'])
            return data
        except Exception:
            raise ValidationError('Unable to find plugin: {0}'.format(data['slug']))


class PluginOutputSchema(LemurOutputSchema):
    id = fields.Integer()
    label = fields.String()
    description = fields.String()
    active = fields.Boolean()
    options = fields.List(fields.Dict(), dump_to='pluginOptions')
    slug = fields.String()
    title = fields.String()


plugins_output_schema = PluginOutputSchema(many=True)
plugin_output_schema = PluginOutputSchema


class BaseExtensionSchema(LemurSchema):
    @pre_load(pass_many=True)
    def preprocess(self, data, many):
        return self.under(data, many=many)

    @post_dump(pass_many=True)
    def post_process(self, data, many):
        if data:
            data = self.camel(data, many=many)
        return data


class BasicConstraintsSchema(BaseExtensionSchema):
    pass


class AuthorityIdentifierSchema(BaseExtensionSchema):
    use_authority_cert = fields.Boolean()


class AuthorityKeyIdentifierSchema(BaseExtensionSchema):
    use_key_identifier = fields.Boolean()


class CertificateInfoAccessSchema(BaseExtensionSchema):
    include_aia = fields.Boolean()

    @post_dump
    def handle_keys(self, data):
        return {'includeAIA': data['include_aia']}


class KeyUsageSchema(BaseExtensionSchema):
    use_crl_sign = fields.Boolean()
    use_data_encipherment = fields.Boolean()
    use_decipher_only = fields.Boolean()
    use_encipher_only = fields.Boolean()
    use_key_encipherment = fields.Boolean()
    use_digital_signature = fields.Boolean()
    use_non_repudiation = fields.Boolean()


class ExtendedKeyUsageSchema(BaseExtensionSchema):
    use_server_authentication = fields.Boolean()
    use_client_authentication = fields.Boolean()
    use_eap_over_lan = fields.Boolean()
    use_eap_over_ppp = fields.Boolean()
    use_ocsp_signing = fields.Boolean()
    use_smart_card_authentication = fields.Boolean()
    use_timestamping = fields.Boolean()


class SubjectKeyIdentifierSchema(BaseExtensionSchema):
    include_ski = fields.Boolean()

    @post_dump
    def handle_keys(self, data):
        return {'includeSKI': data['include_ski']}


class SubAltNameSchema(BaseExtensionSchema):
    name_type = fields.String(validate=validators.sub_alt_type)
    value = fields.String()

    @validates_schema
    def check_sensitive(self, data):
        if data.get('name_type') == 'DNSName':
            validators.sensitive_domain(data['value'])


class SubAltNamesSchema(BaseExtensionSchema):
    names = fields.Nested(SubAltNameSchema, many=True)


class CustomOIDSchema(BaseExtensionSchema):
    oid = fields.String()
    encoding = fields.String(validate=validators.encoding)
    value = fields.String()


class ExtensionSchema(BaseExtensionSchema):
    basic_constraints = fields.Nested(BasicConstraintsSchema)
    key_usage = fields.Nested(KeyUsageSchema)
    extended_key_usage = fields.Nested(ExtendedKeyUsageSchema)
    subject_key_identifier = fields.Nested(SubjectKeyIdentifierSchema)
    sub_alt_names = fields.Nested(SubAltNamesSchema)
    authority_identifier = fields.Nested(AuthorityIdentifierSchema)
    authority_key_identifier = fields.Nested(AuthorityKeyIdentifierSchema)
    certificate_info_access = fields.Nested(CertificateInfoAccessSchema)
    custom = fields.List(fields.Nested(CustomOIDSchema))


class EndpointNestedOutputSchema(LemurOutputSchema):
    __envelope__ = False
    id = fields.Integer()
    description = fields.String()
    name = fields.String()
    dnsname = fields.String()
    owner = fields.Email()
    type = fields.String()
    active = fields.Boolean()