# Copyright 2016 - Nokia
#
# 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.

from vitrage.common.constants import DatasourceProperties as DSProps
from vitrage.common.constants import EdgeLabel
from vitrage.common.constants import EntityCategory
from vitrage.common.constants import VertexProperties as VProps
from vitrage.datasources.alarm_properties import AlarmProperties as AlarmProps
from vitrage.datasources.alarm_transformer_base import AlarmTransformerBase
from vitrage.datasources import transformer_base as tbase
from vitrage.datasources.zabbix.properties import ZabbixProperties as ZProps
from vitrage.datasources.zabbix.properties import ZabbixTriggerSeverity \
    as TriggerSeverity
from vitrage.datasources.zabbix.properties import ZabbixTriggerValue\
    as TriggerValue
from vitrage.datasources.zabbix import ZABBIX_DATASOURCE
import vitrage.graph.utils as graph_utils
from vitrage.utils.datetime import change_time_str_format
from vitrage.utils.datetime import format_unix_timestamp


class ZabbixTransformer(AlarmTransformerBase):

    def __init__(self, transformers, conf):
        super(ZabbixTransformer, self).__init__(transformers, conf)

    def _create_snapshot_entity_vertex(self, entity_event):
        return self._create_vertex(entity_event)

    def _create_update_entity_vertex(self, entity_event):
        return self._create_vertex(entity_event)

    def _create_vertex(self, entity_event):
        self._unify_time_format(entity_event)

        update_timestamp = entity_event[ZProps.TIMESTAMP]

        vitrage_sample_timestamp = entity_event[DSProps.SAMPLE_DATE]

        update_timestamp = \
            self._format_update_timestamp(update_timestamp,
                                          vitrage_sample_timestamp)

        zabbix_hostname = entity_event[ZProps.ZABBIX_RESOURCE_NAME]
        vitrage_hostname = entity_event[ZProps.RESOURCE_NAME]
        entity_event[ZProps.DESCRIPTION] = entity_event[ZProps.DESCRIPTION]\
            .replace(zabbix_hostname, vitrage_hostname)

        value = entity_event[ZProps.VALUE]
        entity_state = AlarmProps.INACTIVE_STATE if \
            value == TriggerValue.OK else AlarmProps.ACTIVE_STATE

        metadata = {
            VProps.NAME: entity_event[ZProps.DESCRIPTION],
            VProps.SEVERITY: TriggerSeverity.str(
                entity_event[ZProps.PRIORITY]),
            VProps.RAWTEXT: entity_event[ZProps.RAWTEXT],
            VProps.RESOURCE_ID: entity_event[ZProps.RESOURCE_NAME]
        }

        return graph_utils.create_vertex(
            self._create_entity_key(entity_event),
            vitrage_category=EntityCategory.ALARM,
            vitrage_type=entity_event[DSProps.ENTITY_TYPE],
            vitrage_sample_timestamp=vitrage_sample_timestamp,
            entity_state=entity_state,
            update_timestamp=update_timestamp,
            metadata=metadata)

    def _create_snapshot_neighbors(self, entity_event):
        return self._create_zabbix_neighbors(entity_event)

    def _create_update_neighbors(self, entity_event):
        return self._create_zabbix_neighbors(entity_event)

    def _create_zabbix_neighbors(self, entity_event):
        self._unify_time_format(entity_event)

        resource_type = entity_event[ZProps.RESOURCE_TYPE]
        if resource_type:
            return [self._create_neighbor(
                entity_event,
                entity_event[ZProps.RESOURCE_NAME],
                resource_type,
                EdgeLabel.ON,
                neighbor_category=EntityCategory.RESOURCE)]

        return []

    def _ok_status(self, entity_event):
        return entity_event[ZProps.VALUE] == TriggerValue.OK

    def _create_entity_key(self, entity_event):

        entity_type = entity_event[DSProps.ENTITY_TYPE]
        alarm_id = entity_event[ZProps.TRIGGER_ID]
        resource_name = entity_event[ZProps.RESOURCE_NAME]
        return tbase.build_key((EntityCategory.ALARM,
                                entity_type,
                                resource_name,
                                alarm_id))

    @staticmethod
    def _unify_time_format(entity_event):
        try:
            entity_event[ZProps.TIMESTAMP] = format_unix_timestamp(
                entity_event[ZProps.LAST_CHANGE], tbase.TIMESTAMP_FORMAT)
        except ValueError:
            entity_event[ZProps.TIMESTAMP] = change_time_str_format(
                entity_event[ZProps.LAST_CHANGE],
                ZProps.ZABBIX_TIMESTAMP_FORMAT,
                tbase.TIMESTAMP_FORMAT)

    def get_vitrage_type(self):
        return ZABBIX_DATASOURCE
