from keystoneclient.v2_0 import client as keystone_client
from glance import client as glance_client
from novaclient.v1_1 import client as nova_client
from PLC.Config import Config
from PLC.Logger import logger

def parse_novarc(filename):
    opts = {}
    f = open(filename, 'r')
    for line in f:
        try:
            line = line.replace('export', '').strip()
            parts = line.split('=')
            if len(parts) > 1:
                value = parts[1].replace("\'", "")
                value = value.replace('\"', '') 
                opts[parts[0]] = value
        except:
            pass
    f.close()
    return opts


class Client:
    def __init__(self, username=None, password=None, tenant=None, url=None, config=None, *args, **kwds):
        if config:
            config = Config(config)
        else:
            config = Config() 
        self.username = config.nova_admin_user
        self.password = config.nova_admin_password
        self.tenant = config.nova_admin_tenant
        self.url = config.nova_url

        if username:
            self.username = username
        if password:
            self.password = password
        if tenant:
            self.tenant = tenant
        if url:
            self.url = url  

class KeystoneClient(Client):
    def __init__(self, *args, **kwds):
        Client.__init__(self, *args, **kwds)
        self.client = keystone_client.Client(username=self.username,
                                             password=self.password,
                                             tenant_name=self.tenant,
                                             auth_url=self.url)

    def connect(self, *args, **kwds):
        self.__init__(*args, **kwds)
   
    def __getattr__(self, name):
        return getattr(self.client, name) 


class GlanceClient(Client):
    def __init__(self, *args, **kwds):
        Client.__init__(self, *args, **kwds)
        self.client = glance_client.get_client(host='0.0.0.0',
                                               username=self.username,
                                               password=self.password,
                                               tenant=self.tenant,
                                               auth_url=self.url)
    def __getattr__(self, name):
        return getattr(self.client, name)

class NovaClient(Client):
    def __init__(self, *args, **kwds):
        Client.__init__(self, *args, **kwds)
        self.client = nova_client.Client(username=self.username,
                                         api_key=self.password,
                                         project_id=self.tenant,
                                         auth_url=self.url,
                                         region_name='',
                                         extensions=[],
                                         service_type='compute',
                                         service_name='',  
                                         )

    def connect(self, *args, **kwds):
        self.__init__(*args, **kwds)
                              
    def __getattr__(self, name):
        return getattr(self.client, name)       

class NovaShell:
    """
    A simple native shell to a nova backend.
    This class can receive all nova calls to the underlying testbed
    """

    def __init__ ( self, *args, **kwds) :
        # instantiate managers
        self.keystone = KeystoneClient(*args, **kwds)
        self.glance = GlanceClient(*args, **kwds)
        self.nova = NovaClient(*args, **kwds)

    def authenticate(self):
        return self.keystone.authenticate()