"""
Module to handle interaction with Kube
"""
import base64
import os
import urllib3
import yaml

from kubernetes import client as kclient, config as kconfig
from kubernetes.stream import stream
from kubernetes.client.rest import ApiException

from cfg_checker.common import logger, logger_cli
from cfg_checker.common.decorators import retry
from cfg_checker.common.exception import InvalidReturnException, KubeException
from cfg_checker.common.file_utils import create_temp_file_with_content
from cfg_checker.common.other import utils, shell
from cfg_checker.common.ssh_utils import ssh_shell_p
from cfg_checker.common.const import ENV_LOCAL


urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)


def _init_kube_conf_local(config):
    # Init kube library locally
    _path = "local:{}".format(config.kube_config_path)
    try:
        kconfig.load_kube_config(config_file=config.kube_config_path)
        if config.insecure:
            kconfig.assert_hostname = False
            kconfig.client_side_validation = False
        logger_cli.debug(
            "... found Kube env: core, {}". format(
                ",".join(
                    kclient.CoreApi().get_api_versions().versions
                )
            )
        )
        return kconfig, kclient.ApiClient(), _path
    except Exception as e:
        logger.warn("Failed to init local Kube client: {}".format(
                str(e)
            )
        )
        return None, None, _path


def _init_kube_conf_remote(config):
    # init remote client
    # Preload Kube token
    """
    APISERVER=$(kubectl config view --minify |
            grep server | cut -f 2- -d ":" | tr -d " ")
    SECRET_NAME=$(kubectl get secrets |
            grep ^default | cut -f1 -d ' ')
    TOKEN=$(kubectl describe secret $SECRET_NAME |
            grep -E '^token' | cut -f2 -d':' | tr -d " ")

    echo "Detected API Server at: '${APISERVER}'"
    echo "Got secret: '${SECRET_NAME}'"
    echo "Loaded token: '${TOKEN}'"

    curl $APISERVER/api
        --header "Authorization: Bearer $TOKEN" --insecure
    """
    import yaml
    _path = ''
    # Try to load remote config only if it was not detected already
    if not config.kube_config_detected and not config.env_name == ENV_LOCAL:
        _path = "{}@{}:{}".format(
            config.ssh_user,
            config.ssh_host,
            config.kube_config_path
        )
        _c_data = ssh_shell_p(
            "cat " + config.kube_config_path,
            config.ssh_host,
            username=config.ssh_user,
            keypath=config.ssh_key,
            piped=False,
            use_sudo=config.ssh_uses_sudo,
        )
    else:
        _path = "local:{}".format(config.kube_config_path)
        with open(config.kube_config_path, 'r') as ff:
            _c_data = ff.read()

    if len(_c_data) < 1:
        return None, None, _path

    _conf = yaml.load(_c_data, Loader=yaml.SafeLoader)

    _kube_conf = kclient.Configuration()
    # A remote host configuration

    # To work with remote cluster, we need to extract these
    # keys = ['host', 'ssl_ca_cert', 'cert_file', 'key_file', 'verify_ssl']
    # When v12 of the client will be release, we will use load_from_dict

    _kube_conf.ssl_ca_cert = create_temp_file_with_content(
        base64.standard_b64decode(
            _conf['clusters'][0]['cluster']['certificate-authority-data']
        )
    )
    _host = _conf['clusters'][0]['cluster']['server']
    _kube_conf.cert_file = create_temp_file_with_content(
        base64.standard_b64decode(
            _conf['users'][0]['user']['client-certificate-data']
        )
    )
    _kube_conf.key_file = create_temp_file_with_content(
        base64.standard_b64decode(
            _conf['users'][0]['user']['client-key-data']
        )
    )
    if "http" not in _host or "443" not in _host:
        logger_cli.error(
            "Failed to extract Kube host: '{}'".format(_host)
        )
    else:
        logger_cli.debug(
            "... 'context' host extracted: '{}' via SSH@{}".format(
                _host,
                config.ssh_host
            )
        )

    # Substitute context host to ours
    _tmp = _host.split(':')
    _kube_conf.host = \
        _tmp[0] + "://" + config.mcp_host + ":" + _tmp[2]
    config.kube_port = _tmp[2]
    logger_cli.debug(
        "... kube remote host updated to {}".format(
            _kube_conf.host
        )
    )
    _kube_conf.verify_ssl = False
    _kube_conf.debug = config.debug
    if config.insecure:
        _kube_conf.assert_hostname = False
        _kube_conf.client_side_validation = False

    # Nevertheless if you want to do it
    # you can with these 2 parameters
    # configuration.verify_ssl=True
    # ssl_ca_cert is the filepath
    # to the file that contains the certificate.
    # configuration.ssl_ca_cert="certificate"

    # _kube_conf.api_key = {
    #     "authorization": "Bearer " + config.kube_token
    # }

    # Create a ApiClient with our config
    _kube_api = kclient.ApiClient(_kube_conf)

    return _kube_conf, _kube_api, _path


class KubeApi(object):
    def __init__(self, config):
        self.config = config
        self.initialized = self._init_kclient()
        self.last_response = None

    def _init_kclient(self):
        # if there is no password - try to get local, if this available
        logger_cli.debug("... init kube config")
        if self.config.env_name == "local":
            self.kConf, self.kApi, self.kConfigPath = _init_kube_conf_local(
                self.config
            )
            self.is_local = True
            # Try to load local config data
            if self.config.kube_config_path and \
               os.path.exists(self.config.kube_config_path):
                _cmd = "cat " + self.config.kube_config_path
                _c_data = shell(_cmd)
                _conf = yaml.load(_c_data, Loader=yaml.SafeLoader)
                self.user_keypath = create_temp_file_with_content(
                    base64.standard_b64decode(
                        _conf['users'][0]['user']['client-key-data']
                    )
                )
                self.yaml_conf = _c_data
        else:
            self.kConf, self.kApi, self.kConfigPath = _init_kube_conf_remote(
                self.config
            )
            self.is_local = False

        if self.kConf is None or self.kApi is None:
            return False
        else:
            return True

    def get_versions_api(self):
        # client.CoreApi().get_api_versions().versions
        return kclient.VersionApi(self.kApi)


class KubeRemote(KubeApi):
    def __init__(self, config):
        super(KubeRemote, self).__init__(config)
        self._coreV1 = None
        self._appsV1 = None
        self._podV1 = None
        self._custom = None

    @property
    def CustomObjects(self):
        if not self._custom:
            self._custom = kclient.CustomObjectsApi(self.kApi)
        return self._custom

    @property
    def CoreV1(self):
        if not self._coreV1:
            if self.is_local:
                self._coreV1 = kclient.CoreV1Api(kclient.ApiClient())
            else:
                self._coreV1 = kclient.CoreV1Api(kclient.ApiClient(self.kConf))
        return self._coreV1

    @property
    def AppsV1(self):
        if not self._appsV1:
            self._appsV1 = kclient.AppsV1Api(self.kApi)
        return self._appsV1

    @property
    def PodsV1(self):
        if not self._podsV1:
            self._podsV1 = kclient.V1Pod(self.kApi)
        return self._podsV1

    @staticmethod
    def _typed_list_to_dict(i_list):
        _dict = {}
        for _item in i_list:
            _d = _item.to_dict()
            _type = _d.pop("type")
            _dict[_type.lower()] = _d

        return _dict

    @staticmethod
    def _get_listed_attrs(items, _path):
        _list = []
        for _n in items:
            _list.append(utils.rgetattr(_n, _path))

        return _list

    @staticmethod
    def safe_get_item_by_name(api_resource, _name):
        for item in api_resource.items:
            if item.metadata.name == _name:
                return item

        return None

    def get_node_info(self, http=False):
        # Query API for the nodes and do some presorting
        _nodes = {}
        if http:
            _raw_nodes = self.CoreV1.list_node_with_http_info()
        else:
            _raw_nodes = self.CoreV1.list_node()

        if not isinstance(_raw_nodes, kclient.models.v1_node_list.V1NodeList):
            raise InvalidReturnException(
                "Invalid return type: '{}'".format(type(_raw_nodes))
            )

        for _n in _raw_nodes.items:
            _name = _n.metadata.name
            _d = _n.to_dict()
            # parse inner data classes as dicts
            _d['addresses'] = self._typed_list_to_dict(_n.status.addresses)
            _d['conditions'] = self._typed_list_to_dict(_n.status.conditions)
            # Update 'status' type
            if isinstance(_d['conditions']['ready']['status'], str):
                _d['conditions']['ready']['status'] = utils.to_bool(
                    _d['conditions']['ready']['status']
                )
            # Parse image names?
            # TODO: Here is the place where we can parse each node image names

            # Parse roles
            _d['labels'] = {}
            for _label, _data in _d["metadata"]["labels"].items():
                if _data.lower() in ["true", "false"]:
                    _d['labels'][_label] = utils.to_bool(_data)
                else:
                    _d['labels'][_label] = _data

            # Save
            _nodes[_name] = _d

        # debug report on how many nodes detected
        logger_cli.debug("...node items returned '{}'".format(len(_nodes)))

        return _nodes

    def get_pod_names_by_partial_name(self, partial_name, ns):
        logger_cli.debug('... searching for pods with {}'.format(partial_name))
        _pods = self.CoreV1.list_namespaced_pod(ns)
        _names = self._get_listed_attrs(_pods.items, "metadata.name")
        _pnames = [n for n in _names if partial_name in n]
        if len(_pnames) > 1:
            logger_cli.debug(
                "... more than one pod found for '{}': {}\n".format(
                    partial_name,
                    ", ".join(_pnames)
                )
            )
        elif len(_pnames) < 1:
            logger_cli.warning(
                "WARNING: No pods found for '{}'".format(partial_name)
            )

        return _pnames

    def get_pods_by_partial_name(self, partial_name, ns):
        logger_cli.debug('... searching for pods with {}'.format(partial_name))
        _all_pods = self.CoreV1.list_namespaced_pod(ns)
        # _names = self._get_listed_attrs(_pods.items, "metadata.name")
        _pods = [_pod for _pod in _all_pods.items
                 if partial_name in _pod.metadata.name]
        if len(_pods) > 1:
            logger_cli.debug(
                "... more than one pod found for '{}': {}\n".format(
                    partial_name,
                    ", ".join(partial_name)
                )
            )
        elif len(_pods) < 1:
            logger_cli.warning(
                "WARNING: No pods found for '{}'".format(partial_name)
            )

        return _pods

    def exec_on_target_pod(
        self,
        cmd,
        pod_name,
        namespace,
        strict=False,
        _request_timeout=120,
        **kwargs
    ):
        _pname = ""
        if not strict:
            logger_cli.debug(
                "... searching for pods with the name '{}'".format(pod_name)
            )
            _pods = {}
            _pods = self.CoreV1.list_namespaced_pod(namespace)
            _names = self._get_listed_attrs(_pods.items, "metadata.name")
            _pnames = [n for n in _names if n.startswith(pod_name)]
            if len(_pnames) > 1:
                logger_cli.debug(
                    "... more than one pod found for '{}': {}\n"
                    "... using first one".format(
                        pod_name,
                        ", ".join(_pnames)
                    )
                )
                _pname = _pnames[0]
            elif len(_pnames) < 1:
                raise KubeException("No pods found for '{}'".format(pod_name))
        else:
            _pname = pod_name
        logger_cli.debug(
            "... cmd: [CoreV1] exec {} -n {} -- {}".format(
                _pname,
                namespace,
                cmd
            )
        )
        # Set preload_content to False to preserve JSON
        # If not, output gets converted to str
        # Which causes to change " to '
        # After that json.loads(...) fail
        cmd = cmd if isinstance(cmd, list) else cmd.split()
        _pod_stream = stream(
            self.CoreV1.connect_get_namespaced_pod_exec,
            _pname,
            namespace,
            command=cmd,
            stderr=True,
            stdin=False,
            stdout=True,
            tty=False,
            _request_timeout=_request_timeout,
            _preload_content=False,
            **kwargs
        )
        # run for timeout
        _pod_stream.run_forever(timeout=_request_timeout)
        # read the output
        _output = _pod_stream.read_stdout()
        # Force recreate of api objects
        self._coreV1 = None
        # Send output
        return _output

    def ensure_namespace(self, ns):
        """
        Ensure that given namespace exists
        """
        # list active namespaces
        _v1NamespaceList = self.CoreV1.list_namespace()
        _ns = self.safe_get_item_by_name(_v1NamespaceList, ns)

        if _ns is None:
            logger_cli.debug("... creating namespace '{}'".format(ns))
            _new_ns = kclient.V1Namespace()
            _new_ns.metadata = kclient.V1ObjectMeta(name=ns)
            _r = self.CoreV1.create_namespace(_new_ns)
            # TODO: check return on fail
            if not _r:
                return False
        else:
            logger_cli.debug("... found existing namespace '{}'".format(ns))

        return True

    def get_daemon_set_by_name(self, ns, name):
        return self.safe_get_item_by_name(
            self.AppsV1.list_namespaced_daemon_set(ns),
            name
        )

    def create_config_map(self, ns, name, source, recreate=True):
        """
        Creates/Overwrites ConfigMap in working namespace
        """
        # Prepare source
        logger_cli.debug(
            "... preparing config map '{}/{}' with files from '{}'".format(
                ns,
                name,
                source
            )
        )
        _data = {}
        if os.path.isfile(source):
            # populate data with one file
            with open(source, 'rt') as fS:
                _data[os.path.split(source)[1]] = fS.read()
        elif os.path.isdir(source):
            # walk dirs and populate all 'py' files
            for path, dirs, files in os.walk(source):
                _e = ('.py')
                _subfiles = (_fl for _fl in files
                             if _fl.endswith(_e) and not _fl.startswith('.'))
                for _file in _subfiles:
                    with open(os.path.join(path, _file), 'rt') as fS:
                        _data[_file] = fS.read()

        _cm = kclient.V1ConfigMap()
        _cm.metadata = kclient.V1ObjectMeta(name=name, namespace=ns)
        _cm.data = _data
        logger_cli.debug(
            "... prepared config map with {} scripts".format(len(_data))
        )
        # Query existing configmap, delete if needed
        _existing_cm = self.safe_get_item_by_name(
            self.CoreV1.list_namespaced_config_map(namespace=ns),
            name
        )
        if _existing_cm is not None:
            self.CoreV1.replace_namespaced_config_map(
                namespace=ns,
                name=name,
                body=_cm
            )
            logger_cli.debug(
                "... replaced existing config map '{}/{}'".format(
                    ns,
                    name
                )
            )
        else:
            # Create it
            self.CoreV1.create_namespaced_config_map(
                namespace=ns,
                body=_cm
            )
            logger_cli.debug("... created config map '{}/{}'".format(
                ns,
                name
            ))

        return _data.keys()

    def prepare_daemonset_from_yaml(self, ns, ds_yaml):
        _name = ds_yaml['metadata']['name']
        _ds = self.get_daemon_set_by_name(ns, _name)

        if _ds is not None:
            logger_cli.debug(
                "... found existing daemonset '{}'".format(_name)
            )
            _r = self.AppsV1.replace_namespaced_daemon_set(
                _ds.metadata.name,
                _ds.metadata.namespace,
                body=ds_yaml
            )
            logger_cli.debug(
                "... replacing existing daemonset '{}'".format(_name)
            )
            return _r
        else:
            logger_cli.debug(
                "... creating daemonset '{}'".format(_name)
            )
            _r = self.AppsV1.create_namespaced_daemon_set(ns, body=ds_yaml)
            return _r

    def delete_daemon_set_by_name(self, ns, name):
        return self.AppsV1.delete_namespaced_daemon_set(name, ns)

    def exec_on_all_pods(self, pods):
        """
        Create multiple threads to execute script on all target pods
        """
        # Create map for threads: [[node_name, ns, pod_name]...]
        _pod_list = []
        for item in pods.items:
            _pod_list.append(
                [
                    item.spec.nodeName,
                    item.metadata.namespace,
                    item.metadata.name
                ]
            )

        # map func and cmd
        logger_cli.error("ERROR: 'exec_on_all_pods'is not implemented yet")
        # create result list

        return []

    @retry(ApiException)
    def get_pods_for_daemonset(self, ds):
        # get all pod names for daemonset
        logger_cli.debug(
            "... extracting pod names from daemonset '{}'".format(
                ds.metadata.name
            )
        )
        _ns = ds.metadata.namespace
        _name = ds.metadata.name
        _pods = self.CoreV1.list_namespaced_pod(
            namespace=_ns,
            label_selector='name={}'.format(_name)
        )
        return _pods

    def put_string_buffer_to_pod_as_textfile(
        self,
        pod_name,
        namespace,
        buffer,
        filepath,
        _request_timeout=120,
        **kwargs
    ):
        _command = ['/bin/sh']
        response = stream(
            self.CoreV1.connect_get_namespaced_pod_exec,
            pod_name,
            namespace,
            command=_command,
            stderr=True,
            stdin=True,
            stdout=True,
            tty=False,
            _request_timeout=_request_timeout,
            _preload_content=False,
            **kwargs
        )

        # if json
        # buffer = json.dumps(_dict, indent=2).encode('utf-8')

        commands = [
            bytes("cat <<'EOF' >" + filepath + "\n", 'utf-8'),
            buffer,
            bytes("\n" + "EOF\n", 'utf-8')
        ]

        while response.is_open():
            response.update(timeout=1)
            if response.peek_stdout():
                logger_cli.debug("... STDOUT: %s" % response.read_stdout())
            if response.peek_stderr():
                logger_cli.debug("... STDERR: %s" % response.read_stderr())
            if commands:
                c = commands.pop(0)
                logger_cli.debug("... running command... {}\n".format(c))
                response.write_stdin(str(c, encoding='utf-8'))
            else:
                break
        response.close()

        # Force recreate of Api objects
        self._coreV1 = None

        return

    def get_custom_resource(self, group, version, plural):
        # Get it
        # Example:
        # kubernetes.client.CustomObjectsApi().list_cluster_custom_object(
        #   group="networking.istio.io",
        #   version="v1alpha3",
        #   plural="serviceentries"
        # )
        return self.CustomObjects.list_cluster_custom_object(
            group=group,
            version=version,
            plural=plural
        )