from etcd3_wrapper import Etcd3Wrapper

from common.host import HostPool
from common.request import RequestPool
from common.vm import VmPool
from common.storage_handlers import FileSystemBasedImageStorageHandler, CEPHBasedImageStorageHandler
from decouple import Config, RepositoryEnv


env_vars = Config(RepositoryEnv('/etc/ucloud/ucloud.conf'))

etcd_wrapper_args = ()
etcd_wrapper_kwargs = {'host': env_vars.get('ETCD_URL')}

etcd_client = Etcd3Wrapper(*etcd_wrapper_args, **etcd_wrapper_kwargs)

host_pool = HostPool(etcd_client, env_vars.get('HOST_PREFIX'))
vm_pool = VmPool(etcd_client, env_vars.get('VM_PREFIX'))
request_pool = RequestPool(etcd_client, env_vars.get('REQUEST_PREFIX'))

running_vms = []

__storage_backend = env_vars.get("STORAGE_BACKEND")
if __storage_backend == "filesystem":
    image_storage_handler = FileSystemBasedImageStorageHandler(vm_base=env_vars.get("VM_DIR"),
                                                               image_base=env_vars.get("IMAGE_DIR"))
elif __storage_backend == "ceph":
    image_storage_handler = CEPHBasedImageStorageHandler(vm_base="ssd", image_base="ssd")
else:
    raise Exception("Unknown Image Storage Handler")