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# Copyright (c) 2017-2018 Wind River Systems, Inc.
#
# 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 logging
import traceback

from common.exceptions import VimDriverNewtonException
from newton_base.util import VimDriverUtils

from keystoneauth1.exceptions import HttpError
from rest_framework import status
from rest_framework.response import Response
from rest_framework.views import APIView
from common.msapi import extsys

logger = logging.getLogger(__name__)


class CapacityCheck(APIView):
    def __init__(self):
        self._logger = logger

    def post(self, request, vimid=""):
        self._logger.info("vimid, data> %s, %s" % (vimid, request.data))
        self._logger.debug("META> %s" % request.META)

        try:
            # Get the specified tenant id
            specified_project_idorname = request.META.get("Project", None)

            hasEnoughResource = self.get_tenant_cap_info(vimid, request.data, specified_project_idorname)
            self._logger.info("RESP with data> result:%s" % hasEnoughResource)
            return Response(data={'result': hasEnoughResource}, status=status.HTTP_200_OK)
        except VimDriverNewtonException as e:
            self._logger.error("Plugin exception> status:%s,error:%s"
                               % (e.status_code, e.content))
            return Response(data={'result': False,
                                  'error': e.content}, status=e.status_code)
        except HttpError as e:
            self._logger.error("HttpError: status:%s, response:%s" % (e.http_status, e.response.json()))
            resp = e.response.json()
            resp.update({'result': False})
            return Response(data=e.response.json(), status=e.http_status)
        except Exception as e:
            self._logger.error(traceback.format_exc())
            return Response(data={'result': False, 'error': str(e)},
                            status=status.HTTP_500_INTERNAL_SERVER_ERROR)

    def get_tenant_cap_info(self, vimid, resource_demand, project_idorname=None):
        hasEnoughResource = False
        tenant_name = None
        vim = VimDriverUtils.get_vim_info(vimid)
        sess = None
        if project_idorname:
            try:
                # check if specified with tenant id
                sess = VimDriverUtils.get_session(
                    vim, tenant_name=None,
                    tenant_id=project_idorname
                )
            except Exception as e:
                pass

            if not sess:
                try:
                    # check if specified with tenant name
                    sess = VimDriverUtils.get_session(
                        vim, tenant_name=project_idorname,
                        tenant_id=None
                    )
                except Exception as e:
                    pass

        if not sess:
            sess = VimDriverUtils.get_session(
                vim, tenant_name=tenant_name, tenant_id=None)

        # get token:
        # cloud_owner, regionid = extsys.decode_vim_id(vimid)
        interface = 'public'
        service = {'service_type': 'compute',
                   'interface': interface,
                   'region_name': vim['openstack_region_id']
                   if vim.get('openstack_region_id')
                   else vim['cloud_region_id']
                   }

        # get limit for this tenant
        req_resouce = "/limits"
        self._logger.info("check limits> URI:%s" % req_resouce)
        resp = sess.get(req_resouce, endpoint_filter=service)
        self._logger.info("check limits> status:%s" % resp.status_code)
        content = resp.json()
        compute_limits = content['limits']['absolute']
        self._logger.debug("check limits> resp data:%s" % content)

        # get total resource of this cloud region
        try:
            req_resouce = "/os-hypervisors/statistics"
            self._logger.info("check os-hypervisors statistics> URI:%s" % req_resouce)
            resp = sess.get(req_resouce, endpoint_filter=service)
            self._logger.info("check os-hypervisors statistics> status:%s" % resp.status_code)
            content = resp.json()
            hypervisor_statistics = content['hypervisor_statistics']
            self._logger.debug("check os-hypervisors statistics> resp data:%s" % content)
        except HttpError as e:
            if e.http_status == status.HTTP_403_FORBIDDEN:
                # Due to non administrator account cannot get hypervisor data,
                # so construct enough resource data
                conVCPUS = int(resource_demand['vCPU'])
                conFreeRamMB = int(resource_demand['Memory'])
                conFreeDiskGB = int(resource_demand['Storage'])
                self._logger.info("Non administator forbidden to access hypervisor statistics data")
                hypervisor_statistics = {'vcpus_used': 0,
                                         'vcpus': conVCPUS,
                                         'free_ram_mb': conFreeRamMB,
                                         'free_disk_gb': conFreeDiskGB}
            else:
                # non forbiden exeption will be redirected
                raise e

        # get storage limit for this tenant
        service['service_type'] = 'volumev2'
        req_resouce = "/limits"
        self._logger.info("check volumev2 limits> URI:%s" % req_resouce)
        resp = sess.get(req_resouce, endpoint_filter=service)
        self._logger.info("check volumev2> status:%s" % resp.status_code)
        content = resp.json()
        storage_limits = content['limits']['absolute']
        self._logger.debug("check volumev2> resp data:%s" % content)

        # compute actual available resource for this tenant
        remainVCPU = compute_limits['maxTotalCores'] - compute_limits['totalCoresUsed']
        remainHypervisorVCPU = hypervisor_statistics['vcpus'] - hypervisor_statistics['vcpus_used']

        if (remainVCPU > remainHypervisorVCPU):
            remainVCPU = remainHypervisorVCPU

        remainMEM = compute_limits['maxTotalRAMSize'] - compute_limits['totalRAMUsed']
        remainHypervisorMEM = hypervisor_statistics['free_ram_mb']
        if remainMEM > remainHypervisorMEM:
            remainMEM = remainHypervisorMEM

        remainStorage = storage_limits['maxTotalVolumeGigabytes'] - storage_limits['totalGigabytesUsed']
        remainHypervisorStorage = hypervisor_statistics['free_disk_gb']
        if (remainStorage > remainHypervisorStorage):
            remainStorage = remainHypervisorStorage

        # compare resource demanded with available
        if (int(resource_demand['vCPU']) > remainVCPU):
            hasEnoughResource = False
        elif (int(resource_demand['Memory']) > remainMEM):
            hasEnoughResource = False
        elif (int(resource_demand['Storage']) > remainStorage):
            hasEnoughResource = False
        else:
            hasEnoughResource = True

        return hasEnoughResource

class APIv1CapacityCheck(CapacityCheck):
    def __init__(self):
        super(APIv1CapacityCheck, self).__init__()
        # self._logger = logger

    def post(self, request, cloud_owner="", cloud_region_id=""):
        self._logger.info("vimid, data> %s,%s, %s" % (cloud_owner, cloud_region_id, request.data))
        self._logger.debug("META> %s" % request.META)

        vimid = extsys.encode_vim_id(cloud_owner, cloud_region_id)
        return super(APIv1CapacityCheck, self).post(request, vimid)