# Copyright 2014 Rackspace US Inc.  All rights reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

import time

from tempest.lib import exceptions
from tempest.lib.services.network import base

from vmware_nsx_tempest_plugin._i18n import _
from vmware_nsx_tempest_plugin.services import network_client_base \
    as base_client

LB_NOTFOUND = "loadbalancer {lb_id} not found"


class LoadBalancersClient(base.BaseNetworkClient):
    resource = 'loadbalancer'
    resource_plural = 'loadbalancers'
    path = 'lbaas/loadbalancers'
    resource_base_path = '/%s' % path
    resource_object_path = '/%s/%%s' % path
    resource_object_status_path = '/%s/%%s/statuses' % path
    resource_object_stats_path = '/%s/%%s/stats' % path

    def create_load_balancer(self, **kwargs):
        uri = self.resource_base_path
        post_data = {self.resource: kwargs}
        return self.create_resource(uri, post_data)

    def update_load_balancer(self, load_balancer_id, **kwargs):
        uri = self.resource_object_path % load_balancer_id
        post_data = {self.resource: kwargs}
        return self.update_resource(uri, post_data)

    def show_load_balancer(self, load_balancer_id, **fields):
        uri = self.resource_object_path % load_balancer_id
        return self.show_resource(uri, **fields)

    def show_load_balancer_status_tree(self, load_balancer_id, **fields):
        uri = self.resource_object_status_path % load_balancer_id
        return self.show_resource(uri, **fields)

    def show_load_balancer_stats(self, load_balancer_id, **fields):
        uri = self.resource_object_stats_path % load_balancer_id
        return self.show_resource(uri, **fields)

    def delete_load_balancer(self, load_balancer_id):
        uri = self.resource_object_path % load_balancer_id
        return self.delete_resource(uri)

    def list_load_balancers(self, **filters):
        uri = self.resource_base_path
        return self.list_resources(uri, **filters)

    def wait_for_load_balancer_status(self, load_balancer_id,
                                      provisioning_status='ACTIVE',
                                      operating_status='ONLINE',
                                      is_delete_op=False):
        """Must have utility method for load-balancer CRUD operation.

        This is the method you must call to make sure load_balancer_id is
        in provisioning_status=ACTIVE and opration_status=ONLINE status
        before manipulating any lbaas resource under load_balancer_id.
        """

        interval_time = self.build_interval
        timeout = self.build_timeout
        end_time = time.time() + timeout
        lb = None
        while time.time() < end_time:
            try:
                lb = self.show_load_balancer(load_balancer_id)
                if not lb:
                    if is_delete_op:
                        break
                    else:
                        raise Exception(
                            LB_NOTFOUND.format(lb_id=load_balancer_id))
                lb = lb.get(self.resource, lb)
                if (lb.get('provisioning_status') == provisioning_status and
                    lb.get('operating_status') == operating_status):
                    break
                time.sleep(interval_time)
            except exceptions.NotFound as e:
                if is_delete_op:
                    break
                else:
                    raise e
        else:
            if is_delete_op:
                raise exceptions.TimeoutException(
                    _("Waited for load balancer {lb_id} to be deleted for "
                      "{timeout} seconds but can still observe that it "
                      "exists.").format(
                          lb_id=load_balancer_id,
                          timeout=timeout))
            else:
                raise exceptions.TimeoutException(
                    _("Wait for load balancer ran for {timeout} seconds and "
                      "did not observe {lb_id} reach {provisioning_status} "
                      "provisioning status and {operating_status} "
                      "operating status.").format(
                          timeout=timeout,
                          lb_id=load_balancer_id,
                          provisioning_status=provisioning_status,
                          operating_status=operating_status))
        return lb


def get_client(client_mgr):
    """create a lbaas load-balancers client from manager or networks_client

    For itempest user:
        from itempest import load_our_solar_system as osn
        from vmware_nsx_tempest_plugin.services.lbaas import
            load_balancers_client
        lbaas_client = load_balancers_client.get_client(osn.adm.manager)
    For tempest user:
        lbaas_client = load_balancers_client.get_client(osn.adm)
    """
    manager = getattr(client_mgr, 'manager', client_mgr)
    net_client = getattr(manager, 'networks_client')
    try:
        _params = base_client.default_params_with_timeout_values.copy()
    except Exception:
        _params = {}
    client = LoadBalancersClient(net_client.auth_provider,
                                 net_client.service,
                                 net_client.region,
                                 net_client.endpoint_type,
                                 **_params)
    return client