# (c) Copyright 2014-2016 Hewlett-Packard Development Company, L.P.
#
# 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 requests

from oslo_serialization import jsonutils as json

from freezerclient import exceptions
from freezerclient import utils


class BackupsManager(object):

    def __init__(self, client, verify=True):
        self.client = client
        self.endpoint = self.client.endpoint + '/v1/backups/'
        self.verify = verify

    @property
    def headers(self):
        return utils.create_headers_for_request(self.client.auth_token)

    def create(self, backup_metadata):
        r = requests.post(self.endpoint,
                          data=json.dumps(backup_metadata),
                          headers=self.headers,
                          verify=self.verify)
        if r.status_code != 201:
            raise exceptions.ApiClientException(r)
        backup_id = r.json()['backup_id']
        return backup_id

    def delete(self, backup_id):
        endpoint = self.endpoint + backup_id
        r = requests.delete(endpoint, headers=self.headers, verify=self.verify)
        if r.status_code != 204:
            raise exceptions.ApiClientException(r)

    def list(self, limit=10, offset=0, search=None):
        """
        Retrieves a list of backup infos

        :param limit: number of result to return (optional, default 10)
        :param offset: order of first document (optional, default 0)
        :param search: structured query (optional)
                       can contain:
                       * "time_before": timestamp
                       * "time_after": timestamp
                       Example:
                       { "time_before": 1428529956 }
        """
        data = json.dumps(search) if search else None
        query = {'limit': int(limit), 'offset': int(offset)}
        r = requests.get(self.endpoint, headers=self.headers,
                         params=query, data=data, verify=self.verify)
        if r.status_code != 200:
            raise exceptions.ApiClientException(r)

        return r.json()['backups']

    def get(self, backup_id):
        endpoint = self.endpoint + backup_id
        r = requests.get(endpoint, headers=self.headers, verify=self.verify)
        if r.status_code == 200:
            return r.json()
        if r.status_code == 404:
            return None
        raise exceptions.ApiClientException(r)