# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You 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 libcloud.common.types import LibcloudError
from libcloud.common.aws import SignedAWSConnection
from libcloud.storage.drivers.s3 import BaseS3Connection, S3Connection
from libcloud.storage.drivers.s3 import S3StorageDriver

__all__ = [
    'DigitalOceanSpacesStorageDriver'
]

DO_SPACES_HOSTS_BY_REGION = {'nyc3': 'nyc3.digitaloceanspaces.com'}
DO_SPACES_DEFAULT_REGION = 'nyc3'
DEFAULT_SIGNATURE_VERSION = '2'
S3_API_VERSION = '2006-03-01'


class DOSpacesConnectionAWS4(SignedAWSConnection, BaseS3Connection):
    service_name = 's3'
    version = S3_API_VERSION

    def __init__(self, user_id, key, secure=True, host=None, port=None,
                 url=None, timeout=None, proxy_url=None, token=None,
                 retry_delay=None, backoff=None, **kwargs):

        super(DOSpacesConnectionAWS4, self).__init__(user_id, key,
                                                     secure, host,
                                                     port, url,
                                                     timeout,
                                                     proxy_url, token,
                                                     retry_delay,
                                                     backoff,
                                                     signature_version=4)


class DOSpacesConnectionAWS2(S3Connection):

    def __init__(self, user_id, key, secure=True, host=None, port=None,
                 url=None, timeout=None, proxy_url=None, token=None,
                 retry_delay=None, backoff=None, **kwargs):

        super(DOSpacesConnectionAWS2, self).__init__(user_id, key,
                                                     secure, host,
                                                     port, url,
                                                     timeout,
                                                     proxy_url, token,
                                                     retry_delay,
                                                     backoff)


class DigitalOceanSpacesStorageDriver(S3StorageDriver):
    name = 'DigitalOcean Spaces'
    website = 'https://www.digitalocean.com/products/object-storage/'
    supports_chunked_encoding = False
    supports_s3_multipart_upload = True

    def __init__(self, key, secret=None, secure=True, host=None, port=None,
                 api_version=None, region=DO_SPACES_DEFAULT_REGION, **kwargs):

        if region not in DO_SPACES_HOSTS_BY_REGION:
            raise LibcloudError('Unknown region (%s)' % (region), driver=self)

        host = DO_SPACES_HOSTS_BY_REGION[region]
        self.name = 'DigitalOcean Spaces (%s)' % (region)

        self.region_name = region
        self.signature_version = str(kwargs.pop('signature_version',
                                                DEFAULT_SIGNATURE_VERSION))

        if self.signature_version == '2':
            self.connectionCls = DOSpacesConnectionAWS2
        elif self.signature_version == '4':
            self.connectionCls = DOSpacesConnectionAWS4
        else:
            raise ValueError('Invalid signature_version: %s' %
                             (self.signature_version))
        self.connectionCls.host = host

        super(DigitalOceanSpacesStorageDriver,
              self).__init__(key, secret,
                             secure, host, port,
                             api_version, region,
                             **kwargs)

    def _ex_connection_class_kwargs(self):
        kwargs = {}
        kwargs['signature_version'] = self.signature_version
        return kwargs
