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# 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,
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from libcloud.common.types import LibcloudError
from libcloud.common.aws import SignedAWSConnection, DEFAULT_SIGNATURE_VERSION
from libcloud.storage.drivers.s3 import BaseS3Connection, S3Connection
from libcloud.storage.drivers.s3 import BaseS3StorageDriver, API_VERSION

__all__ = [
    'S3RGWStorageDriver',
    'S3RGWOutscaleStorageDriver'
]

S3_RGW_DEFAULT_REGION = 'default'

S3_RGW_OUTSCALE_HOSTS_BY_REGION =\
    {'eu-west-1': 'osu.eu-west-1.outscale.com',
     'eu-west-2': 'osu.eu-west-2.outscale.com',
     'us-west-1': 'osu.us-west-1.outscale.com',
     'us-east-2': 'osu.us-east-2.outscale.com',
     'cn-southeast-1': 'osu.cn-southeast-1.outscale.hk'}

S3_RGW_OUTSCALE_DEFAULT_REGION = 'eu-west-2'


class S3RGWConnectionAWS4(SignedAWSConnection, BaseS3Connection):
    service_name = 's3'
    version = 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(S3RGWConnectionAWS4, self).__init__(user_id, key,
                                                  secure, host,
                                                  port, url,
                                                  timeout,
                                                  proxy_url, token,
                                                  retry_delay,
                                                  backoff,
                                                  4)  # force aws4


class S3RGWConnectionAWS2(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(S3RGWConnectionAWS2, self).__init__(user_id, key,
                                                  secure, host,
                                                  port, url,
                                                  timeout,
                                                  proxy_url, token,
                                                  retry_delay,
                                                  backoff)


class S3RGWStorageDriver(BaseS3StorageDriver):
    name = 'Ceph RGW'
    website = 'http://ceph.com/'

    def __init__(self, key, secret=None, secure=True, host=None, port=None,
                 api_version=None, region=S3_RGW_DEFAULT_REGION, **kwargs):

        if host is None:
            raise LibcloudError('host required', driver=self)

        self.name = kwargs.pop('name', None)
        if self.name is None:
            self.name = 'Ceph RGW S3 (%s)' % (region)

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

        if self.signature_version not in ['2', '4']:
            raise ValueError('Invalid signature_version: %s' %
                             (self.signature_version))

        if self.signature_version == '2':
            self.connectionCls = S3RGWConnectionAWS2
        elif self.signature_version == '4':
            self.connectionCls = S3RGWConnectionAWS4
        self.connectionCls.host = host

        super(S3RGWStorageDriver, 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


class S3RGWOutscaleStorageDriver(S3RGWStorageDriver):
    name = 'RGW Outscale'
    website = 'https://en.outscale.com/'

    def __init__(self, key, secret=None, secure=True, host=None, port=None,
                 api_version=None, region=S3_RGW_OUTSCALE_DEFAULT_REGION,
                 **kwargs):
        if region not in S3_RGW_OUTSCALE_HOSTS_BY_REGION:
            raise LibcloudError('Unknown region (%s)' % (region), driver=self)
        host = S3_RGW_OUTSCALE_HOSTS_BY_REGION[region]
        kwargs['name'] = 'OUTSCALE Ceph RGW S3 (%s)' % region
        super(S3RGWOutscaleStorageDriver, self).__init__(key, secret,
                                                         secure, host, port,
                                                         api_version, region,
                                                         **kwargs)