#
#    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.

import six

from heat.common import exception
from heat.common.i18n import _
from heat.engine import attributes
from heat.engine import clients
from heat.engine import constraints
from heat.engine import properties
from heat.engine import resource


class Order(resource.Resource):

    PROPERTIES = (
        NAME, PAYLOAD_CONTENT_TYPE, MODE, EXPIRATION,
        ALGORITHM, BIT_LENGTH,
    ) = (
        'name', 'payload_content_type', 'mode', 'expiration',
        'algorithm', 'bit_length',
    )

    ATTRIBUTES = (
        STATUS, ORDER_REF, SECRET_REF,
    ) = (
        'status', 'order_ref', 'secret_ref',
    )

    properties_schema = {
        NAME: properties.Schema(
            properties.Schema.STRING,
            _('Human readable name for the secret.'),
        ),
        PAYLOAD_CONTENT_TYPE: properties.Schema(
            properties.Schema.STRING,
            _('The type/format the secret data is provided in.'),
            default='application/octet-stream',
            constraints=[
                constraints.AllowedValues([
                    'application/octet-stream',
                ]),
            ],
        ),
        EXPIRATION: properties.Schema(
            properties.Schema.STRING,
            _('The expiration date for the secret in ISO-8601 format.'),
            constraints=[
                constraints.CustomConstraint('iso_8601'),
            ],
        ),
        ALGORITHM: properties.Schema(
            properties.Schema.STRING,
            _('The algorithm type used to generate the secret.'),
            default='aes',
            constraints=[
                constraints.AllowedValues([
                    'aes',
                ]),
            ],
        ),
        BIT_LENGTH: properties.Schema(
            properties.Schema.NUMBER,
            _('The bit-length of the secret.'),
            constraints=[
                constraints.AllowedValues([
                    128,
                    196,
                    256,
                ]),
            ],
        ),
        MODE: properties.Schema(
            properties.Schema.STRING,
            _('The type/mode of the algorithm associated with the secret '
              'information.'),
            default='cbc',
            constraints=[
                constraints.AllowedValues([
                    'cbc',
                ]),
            ],
        ),
    }

    attributes_schema = {
        STATUS: attributes.Schema(_('The status of the order.')),
        ORDER_REF: attributes.Schema(_('The URI to the order.')),
        SECRET_REF: attributes.Schema(_('The URI to the created secret.')),
    }

    def barbican(self):
        return self.client('barbican')

    def handle_create(self):
        info = dict(self.properties)
        order = self.barbican().orders.create_key(**info)
        order_ref = order.submit()
        self.resource_id_set(order_ref)
        return order_ref

    def check_create_complete(self, order_href):
        order = self.barbican().orders.get(order_href)

        if order.status == 'ERROR':
            reason = order.error_reason
            code = order.error_status_code
            msg = (_("Order '%(name)s' failed: %(code)s - %(reason)s")
                   % {'name': self.name, 'code': code, 'reason': reason})
            raise exception.Error(msg)

        return order.status == 'ACTIVE'

    def handle_delete(self):
        if not self.resource_id:
            return

        client = self.barbican()
        try:
            client.orders.delete(self.resource_id)
        except Exception as exc:
            # This is the only exception the client raises
            # Inspecting the message to see if it's a 'Not Found'
            if 'Not Found' not in six.text_type(exc):
                raise

    def _resolve_attribute(self, name):
        order = self.barbican().orders.get(self.resource_id)
        return getattr(order, name)


def resource_mapping():
    return {
        'OS::Barbican::Order': Order,
    }


def available_resource_mapping():
    if not clients.has_client('barbican'):
        return {}

    return resource_mapping()
