# 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.
"""
Digital Ocean Driver
"""

from libcloud.utils.py3 import httplib

from libcloud.common.base import ConnectionUserAndKey, JsonResponse
from libcloud.compute.types import Provider, NodeState, InvalidCredsError
from libcloud.compute.base import NodeDriver
from libcloud.compute.base import Node, NodeImage, NodeSize, NodeLocation


class DigitalOceanResponse(JsonResponse):
    def parse_error(self):
        if self.status == httplib.FOUND and '/api/error' in self.body:
            # Hacky, but DigitalOcean error responses are awful
            raise InvalidCredsError(self.body)
        elif self.status == httplib.UNAUTHORIZED:
            body = self.parse_body()
            raise InvalidCredsError(body['message'])


class SSHKey(object):
    def __init__(self, id, name, pub_key):
        self.id = id
        self.name = name
        self.pub_key = pub_key

    def __repr__(self):
        return (('<SSHKey: id=%s, name=%s, pub_key=%s>') %
                (self.id, self.name, self.pub_key))


class DigitalOceanConnection(ConnectionUserAndKey):
    """
    Connection class for the DigitalOcean driver.
    """

    host = 'api.digitalocean.com'
    responseCls = DigitalOceanResponse

    def add_default_params(self, params):
        """
        Add parameters that are necessary for every request

        This method adds ``client_id`` and ``api_key`` to
        the request.
        """
        params['client_id'] = self.user_id
        params['api_key'] = self.key
        return params


class DigitalOceanNodeDriver(NodeDriver):
    """
    DigitalOceanNode node driver.
    """

    connectionCls = DigitalOceanConnection

    type = Provider.DIGITAL_OCEAN
    name = 'Digital Ocean'
    website = 'https://www.digitalocean.com'

    NODE_STATE_MAP = {'new': NodeState.PENDING,
                      'off': NodeState.REBOOTING,
                      'active': NodeState.RUNNING}

    def list_nodes(self):
        data = self.connection.request('/droplets').object['droplets']
        return list(map(self._to_node, data))

    def list_locations(self):
        data = self.connection.request('/regions').object['regions']
        return list(map(self._to_location, data))

    def list_images(self):
        data = self.connection.request('/images').object['images']
        return list(map(self._to_image, data))

    def list_sizes(self):
        data = self.connection.request('/sizes').object['sizes']
        return list(map(self._to_size, data))

    def create_node(self, name, size, image, location, ex_ssh_key_ids=None,
                    **kwargs):
        """
        Create a node.

        :keyword    ex_ssh_key_ids: A list of ssh key ids which will be added
                                   to the server. (optional)
        :type       ex_ssh_key_ids: ``list`` of ``str``

        :return: The newly created node.
        :rtype: :class:`Node`
        """
        params = {'name': name, 'size_id': size.id, 'image_id': image.id,
                  'region_id': location.id}

        if ex_ssh_key_ids:
            params['ssh_key_ids'] = ','.join(ex_ssh_key_ids)

        data = self.connection.request('/droplets/new', params=params).object
        return self._to_node(data=data['droplet'])

    def reboot_node(self, node):
        res = self.connection.request('/droplets/%s/reboot/' % (node.id))
        return res.status == httplib.OK

    def destroy_node(self, node):
        res = self.connection.request('/droplets/%s/destroy/' % (node.id))
        return res.status == httplib.OK

    def ex_list_ssh_keys(self):
        """
        List all the available SSH keys.

        :return: Available SSH keys.
        :rtype: ``list`` of :class:`SSHKey`
        """
        data = self.connection.request('/ssh_keys').object['ssh_keys']
        return list(map(self._to_ssh_key, data))

    def ex_create_ssh_key(self, name, ssh_key_pub):
        """
        Create a new SSH key.

        :param      name: Key name (required)
        :type       name: ``str``

        :param      name: Valid public key string (required)
        :type       name: ``str``
        """
        params = {'name': name, 'ssh_pub_key': ssh_key_pub}
        data = self.connection.request('/ssh_keys/new/', method='GET',
                                       params=params).object
        assert 'ssh_key' in data
        return self._to_ssh_key(data=data['ssh_key'])

    def ex_destroy_ssh_key(self, key_id):
        """
        Delete an existing SSH key.

        :param      key_id: SSH key id (required)
        :type       key_id: ``str``
        """
        res = self.connection.request('/ssh_keys/%s/destroy/' % (key_id))
        return res.status == httplib.OK

    def _to_node(self, data):
        extra_keys = ['backups_active', 'region_id']
        if 'status' in data:
            state = self.NODE_STATE_MAP.get(data['status'], NodeState.UNKNOWN)
        else:
            state = NodeState.UNKNOWN

        if 'ip_address' in data and data['ip_address'] is not None:
            public_ips = [data['ip_address']]
        else:
            public_ips = []

        extra = {}
        for key in extra_keys:
            if key in data:
                extra[key] = data[key]

        node = Node(id=data['id'], name=data['name'], state=state,
                    public_ips=public_ips, private_ips=None, extra=extra,
                    driver=self)
        return node

    def _to_image(self, data):
        extra = {'distribution': data['distribution']}
        return NodeImage(id=data['id'], name=data['name'], extra=extra,
                         driver=self)

    def _to_location(self, data):
        return NodeLocation(id=data['id'], name=data['name'], country=None,
                            driver=self)

    def _to_size(self, data):
        ram = data['name'].lower()

        if 'mb' in ram:
            ram = int(ram.replace('mb', ''))
        elif 'gb' in ram:
            ram = int(ram.replace('gb', '')) * 1024

        return NodeSize(id=data['id'], name=data['name'], ram=ram, disk=0,
                        bandwidth=0, price=0, driver=self)

    def _to_ssh_key(self, data):
        return SSHKey(id=data['id'], name=data['name'],
                      pub_key=data.get('ssh_pub_key', None))
