import json
import os
import time
from benedict import benedict
from utils.util_log import test_log as log
from utils.util_k8s import get_pod_ip_name_pairs
from common.cus_resource_opts import CustomResourceOperations as CusResource

template_yaml = os.path.join(os.path.dirname(__file__), 'template/default.yaml')
MILVUS_GRP = 'milvus.io'
# MILVUS_VER = 'v1alpha1'
MILVUS_VER = 'v1beta1'
# MILVUS_PLURAL = 'milvusclusters'
MILVUS_PLURAL = 'milvuses'
# MILVUS_KIND = 'MilvusCluster'
MILVUS_KIND = 'Milvus'


class MilvusOperator(object):
    def __init__(self):
        self.group = MILVUS_GRP
        self.version = MILVUS_VER
        self.plural = MILVUS_PLURAL.lower()

    @staticmethod
    def _update_configs(configs, template=None):
        """
        Method: update the template with customized configs
        Params:
            configs: a dict type of configurations that describe the properties of milvus to be deployed
            template: Optional. Pass the template file location if there is a template to apply
        Return: a dict type customized configs
        """
        if not isinstance(configs, dict):
            log.error("customize configurations must be in dict type")
            return None

        if template is None:
            # d_configs = benedict()
            log.debug(f'template yaml {template_yaml}')
            d_configs = benedict.from_yaml(template_yaml)
            d_configs['apiVersion'] = f'{MILVUS_GRP}/{MILVUS_VER}'
            d_configs['kind'] = MILVUS_KIND
        else:
            d_configs = benedict.from_yaml(template)

        for key in configs.keys():
            d_configs[key] = configs[key]

        # return a python dict if it is not none
        return d_configs._dict if d_configs._dict is not None else d_configs

    def install(self, configs, template=None):
        """
        Method: apply a custom resource object to install milvus
        Params:
            configs: a dict type of configurations that describe the properties of milvus to be deployed
            template: Optional. Pass the template file location if there is a template to apply
        Return: custom resource object instance
        """
        new_configs = self._update_configs(configs, template)
        log.debug(new_configs)
        namespace = new_configs['metadata'].get('namespace', 'default')
        # apply custom resource object to deploy milvus
        cus_res = CusResource(kind=self.plural, group=self.group,
                              version=self.version, namespace=namespace)
        log.info(f'install milvus with configs: {json.dumps(new_configs, indent=4)}')
        return cus_res.create(new_configs)

    def uninstall(self, release_name, namespace='default', delete_depends=True, delete_pvc=True):
        """
        Method: delete custom resource object to uninstall milvus
        Params:
            release_name: release name of milvus
            namespace: namespace that the milvus is running in
            delete_depends: whether to delete the dependent etcd, pulsar and minio services. default: True
            delete_pvc: whether to delete the data persistent pvc volumes. default: True
        """
        cus_res = CusResource(kind=self.plural, group=self.group,
                              version=self.version, namespace=namespace)
        del_configs = {}
        if delete_depends:
            del_configs = {'spec.dependencies.etcd.inCluster.deletionPolicy': 'Delete',
                           'spec.dependencies.pulsar.inCluster.deletionPolicy': 'Delete',
                           'spec.dependencies.kafka.inCluster.deletionPolicy': 'Delete',
                           'spec.dependencies.storage.inCluster.deletionPolicy': 'Delete'
                           }
        if delete_pvc:
            del_configs.update({'spec.dependencies.etcd.inCluster.pvcDeletion': True,
                                'spec.dependencies.pulsar.inCluster.pvcDeletion': True,
                                'spec.dependencies.kafka.inCluster.pvcDeletion': True,
                                'spec.dependencies.storage.inCluster.pvcDeletion': True
                                })
        if delete_depends or delete_pvc:
            self.upgrade(release_name, del_configs, namespace=namespace)
        cus_res.delete(release_name)

    def upgrade(self, release_name, configs, namespace='default'):
        """
        Method: patch custom resource object to upgrade milvus
        Params:
            release_name: release name of milvus
            configs: a dict type like configurations to be upgrade milvus
            namespace: namespace that the milvus is running in
        """
        if not isinstance(configs, dict):
            log.error("customize configurations must be in dict type")
            return None

        d_configs = benedict()

        for key in configs.keys():
            d_configs[key] = configs[key]

        cus_res = CusResource(kind=self.plural, group=self.group,
                              version=self.version, namespace=namespace)
        log.debug(f"upgrade milvus with configs: {d_configs}")
        cus_res.patch(release_name, d_configs)
        self.wait_for_healthy(release_name, namespace=namespace)

    def rolling_update(self, release_name, new_image_name, namespace='default'):
        """
        Method: patch custom resource object to rolling update milvus
        Params:
            release_name: release name of milvus
            namespace: namespace that the milvus is running in
        """
        cus_res = CusResource(kind=self.plural, group=self.group,
                              version=self.version, namespace=namespace)
        rolling_configs = {'spec.components.enableRollingUpdate': True,
                           'spec.components.imageUpdateMode': "rollingUpgrade",
                           'spec.components.image': new_image_name}
        log.debug(f"rolling update milvus with configs: {rolling_configs}")
        cus_res.patch(release_name, rolling_configs)
        self.wait_for_healthy(release_name, namespace=namespace)

    def scale(self, release_name, component, replicas, namespace='default'):
        """
        Method: scale milvus components by replicas
        Params:
            release_name: release name of milvus
            replicas: the number of replicas to scale
            component: the component to scale, e.g: dataNode, queryNode, indexNode, proxy
            namespace: namespace that the milvus is running in
        """
        cus_res = CusResource(kind=self.plural, group=self.group,
                              version=self.version, namespace=namespace)
        component = component.replace('node', 'Node')
        scale_configs = {f'spec.components.{component}.replicas': replicas}
        log.info(f"scale milvus with configs: {scale_configs}")
        self.upgrade(release_name, scale_configs, namespace=namespace)
        self.wait_for_healthy(release_name, namespace=namespace)

    def wait_for_healthy(self, release_name, namespace='default', timeout=600):
        """
        Method: wait a milvus instance until healthy or timeout
        Params:
            release_name: release name of milvus
            namespace: namespace that the milvus is running in
            timeout: default: 600 seconds
        """
        cus_res = CusResource(kind=self.plural, group=self.group,
                              version=self.version, namespace=namespace)
        starttime = time.time()
        log.info(f"start to check healthy: {starttime}")
        while time.time() < starttime + timeout:
            time.sleep(10)
            res_object = cus_res.get(release_name)
            mic_status = res_object.get('status', None)
            if mic_status is not None:
                if 'Healthy' == mic_status.get('status'):
                    log.info(f"milvus healthy in {time.time() - starttime} seconds")
                    return True
                else:
                    log.info(f"milvus status is: {mic_status.get('status')}")
        log.info(f"end to check healthy until timeout {timeout}")
        return False

    def endpoint(self, release_name, namespace='default'):
        """
        Method: get Milvus endpoint by name and namespace
        Return: a string type endpoint. e.g: host:port
        """
        endpoint = None
        cus_res = CusResource(kind=self.plural, group=self.group,
                              version=self.version, namespace=namespace)
        res_object = cus_res.get(release_name)
        if res_object.get('status', None) is not None:
            endpoint = res_object['status']['endpoint']

        return endpoint

    def etcd_endpoints(self, release_name, namespace='default'):
        """
        Method: get etcd endpoints by name and namespace
        Return: a string type etcd endpoints. e.g: host:port
        """
        etcd_endpoints = None
        cus_res = CusResource(kind=self.plural, group=self.group,
                              version=self.version, namespace=namespace)
        res_object = cus_res.get(release_name)
        try:
            etcd_endpoints = res_object['spec']['dependencies']['etcd']['endpoints']
        except KeyError:
            log.info("etcd endpoints not found")
        # get pod ip by pod name
        label_selector = f"app.kubernetes.io/instance={release_name}-etcd, app.kubernetes.io/name=etcd"
        res = get_pod_ip_name_pairs(namespace, label_selector)
        if res:
            etcd_endpoints = [f"{pod_ip}:2379" for pod_ip in res.keys()]
        return etcd_endpoints[0]