#
# Copyright 2017 the original author or authors.
#
# 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.
#

"""
This facade handles kafka-formatted messages from the Core, extracts the kafka
formatting and forwards the request to the concrete handler.
"""

from twisted.internet.defer import inlineCallbacks
from zope.interface import implementer

from adapters.interface import IAdapterInterface
from adapters.protos.core_adapter_pb2 import IntType, InterAdapterMessage
from adapters.protos.device_pb2 import Device
from adapters.protos.openflow_13_pb2 import FlowChanges, FlowGroups, Flows, \
    FlowGroupChanges


class MacAddressError(BaseException):
    def __init__(self, error):
        self.error = error


class IDError(BaseException):
    def __init__(self, error):
        self.error = error


@implementer(IAdapterInterface)
class AdapterRequestFacade(object):
    """
    Gate-keeper between CORE and device adapters.

    On one side it interacts with Core's internal model and update/dispatch
    mechanisms.

    On the other side, it interacts with the adapters standard interface as
    defined in
    """

    def __init__(self, adapter):
        self.adapter = adapter

    @inlineCallbacks
    def start(self):
        self.log.debug('starting')

    @inlineCallbacks
    def stop(self):
        self.log.debug('stopping')

    def adopt_device(self, device):
        d = Device()
        if device:
            device.Unpack(d)
            return True, self.adapter.adopt_device(d)
        else:
            return False, d

    def get_ofp_device_info(self, device):
        d = Device()
        if device:
            device.Unpack(d)
            return True, self.adapter.get_ofp_device_info(d)
        else:
            return False, d

    def get_ofp_port_info(self, device, port_no):
        d = Device()
        if device:
            device.Unpack(d)
        else:
            return (False, d)

        p = IntType()
        port_no.Unpack(p)

        return True, self.adapter.get_ofp_port_info(d, p.val)

    def reconcile_device(self, device):
        return self.adapter.reconcile_device(device)

    def abandon_device(self, device):
        return self.adapter.abandon_device(device)

    def disable_device(self, device):
        d = Device()
        if device:
            device.Unpack(d)
            return True, self.adapter.disable_device(d)
        else:
            return False, d

    def reenable_device(self, device):
        d = Device()
        if device:
            device.Unpack(d)
            return True, self.adapter.reenable_device(d)
        else:
            return False, d

    def reboot_device(self, device):
        d = Device()
        if device:
            device.Unpack(d)
            return (True, self.adapter.reboot_device(d))
        else:
            return (False, d)

    def download_image(self, device, request):
        return self.adapter.download_image(device, request)

    def get_image_download_status(self, device, request):
        return self.adapter.get_image_download_status(device, request)

    def cancel_image_download(self, device, request):
        return self.adapter.cancel_image_download(device, request)

    def activate_image_update(self, device, request):
        return self.adapter.activate_image_update(device, request)

    def revert_image_update(self, device, request):
        return self.adapter.revert_image_update(device, request)

    def self_test(self, device):
        return self.adapter.self_test_device(device)

    def delete_device(self, device):
        d = Device()
        if device:
            device.Unpack(d)
            return (True, self.adapter.delete_device(d))
        else:
            return (False, d)

    def get_device_details(self, device):
        return self.adapter.get_device_details(device)

    def update_flows_bulk(self, device, flows, groups):
        d = Device()
        if device:
            device.Unpack(d)
        else:
            return (False, d)

        f = Flows()
        if flows:
            flows.Unpack(f)

        g = FlowGroups()
        if groups:
            groups.Unpack(g)

        return (True, self.adapter.update_flows_bulk(d, f, g))

    def update_flows_incrementally(self, device, flow_changes, group_changes):
        d = Device()
        if device:
            device.Unpack(d)
        else:
            return (False, d)

        f = FlowChanges()
        if flow_changes:
            flow_changes.Unpack(f)

        g = FlowGroupChanges()
        if group_changes:
            group_changes.Unpack(g)

        return (True, self.adapter.update_flows_incrementally(d, f, g))

    def suppress_alarm(self, filter):
        return self.adapter.suppress_alarm(filter)

    def unsuppress_alarm(self, filter):
        return self.adapter.unsuppress_alarm(filter)

    def process_inter_adapter_message(self, msg):
        m = InterAdapterMessage()
        if msg:
            msg.Unpack(m)
        else:
            return (False, m)

        return (True, self.adapter.process_inter_adapter_message(m))