from etcd3_wrapper import Etcd3Wrapper

from ucloud.common.host import HostPool
from ucloud.common.request import RequestPool
from ucloud.common.vm import VmPool
from ucloud.common.storage_handlers import FileSystemBasedImageStorageHandler, CEPHBasedImageStorageHandler

from decouple import Config, RepositoryEnv, RepositoryEmpty

# Replacing decouple inline
import configparser
import os
import os.path

import logging

log = logging.getLogger("ucloud.config")


conf_name = "ucloud.conf"

try:
    conf_dir = os.environ["UCLOUD_CONF_DIR"]
except KeyError:
    conf_dir = "/etc/ucloud"

config_file = os.path.join(conf_dir, conf_name)

config = configparser.ConfigParser()

try:
    with open(config_file, "r") as conf_fd:
        conf.read(conf_fd)
except FileNotFoundError:
    log.warn("Configuration file not found - using defaults")


# Try importing config, but don't fail if it does not exist
# try:
#     env_vars = Config(RepositoryEnv('/etc/ucloud/ucloud.conf'))
# except FileNotFoundError:
#     env_vars = Config(RepositoryEmpty())


etcd_wrapper_args = ()
etcd_wrapper_kwargs = {
    'host':      config['etcd']['ETCD_URL'],
    'port':      config['etcd']['ETCD_PORT'],
    'ca_cert':   config['etcd']['CA_CERT'],
    'cert_cert': config['etcd']['CERT_CERT'],
    'cert_key':  config['etcd']['CERT_KEY']
}

etcd_client = Etcd3Wrapper(*etcd_wrapper_args, **etcd_wrapper_kwargs)

host_pool = HostPool(etcd_client, config['etcd']['HOST_PREFIX'])
vm_pool = VmPool(etcd_client, config['etcd']['VM_PREFIX'])
request_pool = RequestPool(etcd_client, config['etcd']['REQUEST_PREFIX'])

running_vms = []

__storage_backend = config['storage']["STORAGE_BACKEND"]
if __storage_backend == "filesystem":
    image_storage_handler = FileSystemBasedImageStorageHandler(vm_base=config['storage']["VM_DIR"],
                                                               image_base=config['storage']["IMAGE_DIR"])
elif __storage_backend == "ceph":
    image_storage_handler = CEPHBasedImageStorageHandler(vm_base=config['storage']["CEPH_VM_POOL"],
                                                         image_base=config['storage']["CEPH_IMAGE_POOL"])
else:
    raise Exception("Unknown Image Storage Handler")