# 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.
# libcloud.org 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.
"""
VPS.net driver
"""
from libcloud.providers import Provider
from libcloud.types import NodeState, InvalidCredsException
from libcloud.base import Node, Response, ConnectionUserAndKey, NodeDriver
from libcloud.base import NodeSize, NodeImage, NodeLocation

import base64

# JSON is included in the standard library starting with Python 2.6.  For 2.5
# and 2.4, there's a simplejson egg at: http://pypi.python.org/pypi/simplejson
try: import json
except: import simplejson as json

API_HOST = 'api.vps.net'
API_VERSION = 'api10json'

RAM_PER_NODE = 256
DISK_PER_NODE = 10
BANDWIDTH_PER_NODE = 250
PRICE_PER_NODE = {1: 20,
                  2: 19,
                  3: 18,
                  4: 17,
                  5: 16,
                  6: 15,
                  7: 14,
                  15: 13,
                  30: 12,
                  60: 11,
                  100: 10}

class VPSNetResponse(Response):
    
    def parse_body(self):
        try:
            js = json.loads(self.body)
            return js
        except ValueError:
            return self.body

    def success(self):
        # vps.net wrongly uses 406 for invalid auth creds
        if self.status == 406 or self.status == 403:
          raise InvalidCredsException()
        return True

    def parse_error(self):
        try:
            errors = json.loads(self.body)['errors'][0]
        except ValueError:
            return self.body
        else:
            return "\n".join(errors)

class VPSNetConnection(ConnectionUserAndKey):

    host = API_HOST
    responseCls = VPSNetResponse

    def add_default_headers(self, headers):
        user_b64 = base64.b64encode('%s:%s' % (self.user_id, self.key))
        headers['Authorization'] = 'Basic %s' % (user_b64)
        return headers

class VPSNetNodeDriver(NodeDriver):
    
    type = Provider.VPSNET
    name = "vps.net"
    connectionCls = VPSNetConnection

    def _to_node(self, vm):
        if vm['running']:
            state = NodeState.RUNNING
        else:
            state = NodeState.PENDING

        n = Node(id=vm['id'],
                 name=vm['label'],
                 state=state,
                 public_ip=[vm.get('primary_ip_address', None)],
                 private_ip=[],
                 driver=self.connection.driver)
        return n

    def _to_image(self, image, cloud):
        image = NodeImage(id=image['id'],
                          name="%s: %s" % (cloud, image['label']),
                          driver=self.connection.driver)

        return image

    def _to_size(self, num):
        size = NodeSize(id=num,
                        name="%d Node" % (num,),
                        ram=RAM_PER_NODE * num,
                        disk=DISK_PER_NODE,
                        bandwidth=BANDWIDTH_PER_NODE * num,
                        price=self._get_price_per_node(num) * num,
                        driver=self.connection.driver)
        return size

    def _get_price_per_node(self, num):
        keys = sorted(PRICE_PER_NODE.keys())

        if num >= max(keys):
            return PRICE_PER_NODE[keys[-1]]

        for i in range(0,len(keys)):
            if keys[i] <= num < keys[i+1]:
                return PRICE_PER_NODE[keys[i]]

    def create_node(self, name, image, size, **kwargs):
        headers = {'Content-Type': 'application/json'}
        request = {'virtual_machine':
                        {'label': name,
                         'fqdn': kwargs.get('fqdn', ''),
                         'system_template_id': image.id,
                         'backups_enabled': kwargs.get('backups_enabled', 0),
                         'slices_required': size.id}}

        res = self.connection.request('/virtual_machines.%s' % (API_VERSION,),
                                    data=json.dumps(request),
                                    headers=headers,
                                    method='POST')
        node = self._to_node(res.object['virtual_machine'])
        return node

    def reboot_node(self, node):
        res = self.connection.request('/virtual_machines/%s/%s.%s' % 
                                        (node.id, 'reboot', API_VERSION),
                                        method="POST")
        node = self._to_node(res.object['virtual_machine'])
        return True
    
    def list_sizes(self, location=None):
        res = self.connection.request('/nodes.%s' % (API_VERSION,))
        available_nodes = len([size for size in res.object 
                            if not size['slice']["virtual_machine_id"]])
        sizes = [self._to_size(i) for i in range(1,available_nodes + 1)]
        return sizes

    def destroy_node(self, node):
        res = self.connection.request('/virtual_machines/%s.%s'
                                      % (node.id, API_VERSION),
                                      method='DELETE')
        return res.status == 200

    def list_nodes(self):
        res = self.connection.request('/virtual_machines.%s' % (API_VERSION,))
        return [self._to_node(i['virtual_machine']) for i in res.object] 

    def list_images(self, location=None):
        res = self.connection.request('/available_clouds.%s' % (API_VERSION,))

        images = []
        for cloud in res.object:
            label = cloud['cloud']['label']
            templates = cloud['cloud']['system_templates']
            images.extend([self._to_image(image, label)
                           for image in templates])

        return images

    def list_locations(self):
        return [NodeLocation(0, "VPS.net Western US", 'US', self)]