# 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.

import hmac
import time
import hashlib

from libcloud.utils.py3 import httplib, urlencode
from libcloud.common.base import JsonResponse, ConnectionUserAndKey
from libcloud.common.types import LibcloudError, InvalidCredsError
from libcloud.storage.base import Container, StorageDriver

try:
    import simplejson as json
except ImportError:
    import json  # type: ignore  # noqa: F401


class NimbusResponse(JsonResponse):
    valid_response_codes = [
        httplib.OK,
        httplib.NOT_FOUND,
        httplib.CONFLICT,
        httplib.BAD_REQUEST,
    ]

    def success(self):
        return self.status in self.valid_response_codes

    def parse_error(self):
        if self.status in [httplib.UNAUTHORIZED]:
            raise InvalidCredsError(self.body)
        raise LibcloudError(
            "Unknown error. Status code: %d" % (self.status),
            driver=self.connection.driver,
        )


class NimbusConnection(ConnectionUserAndKey):
    host = "nimbus.io"
    responseCls = NimbusResponse

    def __init__(self, *args, **kwargs):
        self.id = kwargs.pop("id")
        super().__init__(*args, **kwargs)

    def pre_connect_hook(self, params, headers):
        timestamp = str(int(time.time()))
        signature = self._calculate_signature(
            user_id=self.user_id,
            method=self.method,
            params=params,
            path=self.action,
            timestamp=timestamp,
            key=self.key,
        )
        headers["X-NIMBUS-IO-Timestamp"] = timestamp
        headers["Authorization"] = "NIMBUS.IO {}:{}".format(self.id, signature)
        return params, headers

    def _calculate_signature(self, user_id, method, params, path, timestamp, key):
        if params:
            uri_path = path + "?" + urlencode(params)
        else:
            uri_path = path

        string_to_sign = [user_id, method, str(timestamp), uri_path]
        string_to_sign = "\n".join(string_to_sign)

        hmac_value = hmac.new(key, string_to_sign, hashlib.sha256)
        return hmac_value.hexdigest()


class NimbusStorageDriver(StorageDriver):
    name = "Nimbus.io"
    website = "https://nimbus.io/"
    connectionCls = NimbusConnection

    def __init__(self, *args, **kwargs):
        self.user_id = kwargs["user_id"]
        super().__init__(*args, **kwargs)

    def iterate_containers(self):
        response = self.connection.request("/customers/%s/collections" % (self.user_id))
        return self._to_containers(response.object)

    def create_container(self, container_name):
        params = {"action": "create", "name": container_name}
        response = self.connection.request(
            "/customers/%s/collections" % (self.user_id), params=params, method="POST"
        )
        return self._to_container(response.object)

    def _to_containers(self, data):
        for item in data:
            yield self._to_container(item)

    def _to_container(self, data):
        name = data[0]
        extra = {"date_created": data[2]}
        return Container(name=name, extra=extra, driver=self)

    def _ex_connection_class_kwargs(self):
        result = {"id": self.user_id}
        return result