#!/usr/bin/env python

import os
import requests
import yaml
import argparse

from novaclient.client import Client as nova_auth
from keystoneclient.v3.client import Client as keystone_auth

def get_credentials(site_id):
    home = os.environ['HOME']
    with open('{}/clouds.yaml'.format(home),'r') as stream:
        creds = yaml.safe_load(stream)['clouds'][site_id]['auth']

    creds['version'] = '2'
    return creds

def get_auth_token(creds):
    keystone_client = keystone_auth(**creds)
    
    return keystone_client.auth_token

def get_servers(creds):
    nova_client = nova_auth(**creds)

    print(nova_client.servers.list())

def get_cores(creds):
    url="http://placement.example.com:8778"

    token = get_auth_token(creds)

    headers = {}
    headers['content-type'] = 'application/json'
    headers['x-auth-token'] = token

    request = "/resource_providers"

    r = requests.get("{}/{}".format(url,request),headers=headers)

    for res in r.json()['resource_providers']:
      uuid = res['uuid']
      hostname = res['name']

      request = "/resource_providers/{}/inventories".format(uuid)
    
      r = requests.get("{}/{}".format(url,request),headers=headers)

      inventory = r.json()['inventories']

      cores=0

      if 'VCPU' in inventory:
        cores+=inventory['VCPU']['total']
      if 'PCPU' in inventory:
        cores+=inventory['PCPU']['total']


      print("{}: {}".format(hostname,cores))

def _parse_args():
    parser = argparse.ArgumentParser()
    parser.add_argument('-s', '--site', metavar="<site-id>",
                        help="Site to run against", dest="site_id",
                        required=True)
    return parser.parse_args()

def main(args):
    creds = get_credentials(args.site_id)

    get_servers(creds)
    get_cores(creds)

if __name__ == '__main__':
    main(_parse_args())