# Copyright 2021-2023 H2020 TeraFlow (https://www.teraflow-h2020.eu/)
#
# 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
from typing import List, Set, Union
from common.DeviceTypes import DeviceTypeEnum
from common.proto.context_pb2 import Context, ContextId, Device, Empty, Link, Topology, TopologyId
from common.tools.object_factory.Context import json_context, json_context_id
from common.tools.object_factory.Topology import json_topology, json_topology_id
from context.client.ContextClient import ContextClient

LOGGER = logging.getLogger(__name__)

def create_context(
    context_client : ContextClient, context_uuid : str
) -> None:
    existing_context_ids = context_client.ListContextIds(Empty())
    existing_context_uuids = {context_id.context_uuid.uuid for context_id in existing_context_ids.context_ids}
    if context_uuid in existing_context_uuids: return
    context_client.SetContext(Context(**json_context(context_uuid)))

def create_topology(
    context_client : ContextClient, context_uuid : str, topology_uuid : str
) -> None:
    context_id = ContextId(**json_context_id(context_uuid))
    existing_topology_ids = context_client.ListTopologyIds(context_id)
    existing_topology_uuids = {topology_id.topology_uuid.uuid for topology_id in existing_topology_ids.topology_ids}
    if topology_uuid in existing_topology_uuids: return
    context_client.SetTopology(Topology(**json_topology(topology_uuid, context_id=context_id)))

def create_missing_topologies(
    context_client : ContextClient, context_id : ContextId, topology_uuids : List[str]
) -> None:
    # Find existing topologies within own context
    existing_topology_ids = context_client.ListTopologyIds(context_id)
    existing_topology_uuids = {topology_id.topology_uuid.uuid for topology_id in existing_topology_ids.topology_ids}

    # Create topologies within provided context
    for topology_uuid in topology_uuids:
        if topology_uuid in existing_topology_uuids: continue
        grpc_topology = Topology(**json_topology(topology_uuid, context_id=context_id))
        context_client.SetTopology(grpc_topology)

def get_existing_device_uuids(context_client : ContextClient) -> Set[str]:
    existing_device_ids = context_client.ListDeviceIds(Empty())
    existing_device_uuids = {device_id.device_uuid.uuid for device_id in existing_device_ids.device_ids}
    return existing_device_uuids

def get_existing_link_uuids(context_client : ContextClient) -> Set[str]:
    existing_link_ids = context_client.ListLinkIds(Empty())
    existing_link_uuids = {link_id.link_uuid.uuid for link_id in existing_link_ids.link_ids}
    return existing_link_uuids

def add_device_to_topology(
    context_client : ContextClient, context_id : ContextId, topology_uuid : str, device_uuid : str
) -> bool:
    topology_id = TopologyId(**json_topology_id(topology_uuid, context_id=context_id))
    topology_ro = context_client.GetTopology(topology_id)
    device_uuids = {device_id.device_uuid.uuid for device_id in topology_ro.device_ids}
    if device_uuid in device_uuids: return False # already existed

    topology_rw = Topology()
    topology_rw.CopyFrom(topology_ro)
    topology_rw.device_ids.add().device_uuid.uuid = device_uuid
    context_client.SetTopology(topology_rw)
    return True

def add_link_to_topology(
    context_client : ContextClient, context_id : ContextId, topology_uuid : str, link_uuid : str
) -> bool:
    topology_id = TopologyId(**json_topology_id(topology_uuid, context_id=context_id))
    topology_ro = context_client.GetTopology(topology_id)
    link_uuids = {link_id.link_uuid.uuid for link_id in topology_ro.link_ids}
    if link_uuid in link_uuids: return False # already existed

    topology_rw = Topology()
    topology_rw.CopyFrom(topology_ro)
    topology_rw.link_ids.add().link_uuid.uuid = link_uuid
    context_client.SetTopology(topology_rw)
    return True

def get_uuids_of_devices_in_topology(
    context_client : ContextClient, context_id : ContextId, topology_uuid : str
) -> List[str]:
    topology_id = TopologyId(**json_topology_id(topology_uuid, context_id=context_id))
    topology = context_client.GetTopology(topology_id)
    device_uuids = [device_id.device_uuid.uuid for device_id in topology.device_ids]
    return device_uuids

def get_uuids_of_links_in_topology(
    context_client : ContextClient, context_id : ContextId, topology_uuid : str
) -> List[str]:
    topology_id = TopologyId(**json_topology_id(topology_uuid, context_id=context_id))
    topology = context_client.GetTopology(topology_id)
    link_uuids = [link_id.link_uuid.uuid for link_id in topology.link_ids]
    return link_uuids

def get_devices_in_topology(
    context_client : ContextClient, context_id : ContextId, topology_uuid : str
) -> List[Device]:
    device_uuids = get_uuids_of_devices_in_topology(context_client, context_id, topology_uuid) 

    all_devices = context_client.ListDevices(Empty())
    devices_in_topology = list()
    for device in all_devices.devices:
        device_uuid = device.device_id.device_uuid.uuid
        if device_uuid not in device_uuids: continue
        devices_in_topology.append(device)

    return devices_in_topology

def get_links_in_topology(
    context_client : ContextClient, context_id : ContextId, topology_uuid : str
) -> List[Link]:
    link_uuids = get_uuids_of_links_in_topology(context_client, context_id, topology_uuid) 

    all_links = context_client.ListLinks(Empty())
    links_in_topology = list()
    for link in all_links.links:
        link_uuid = link.link_id.link_uuid.uuid
        if link_uuid not in link_uuids: continue
        links_in_topology.append(link)

    return links_in_topology

def device_type_is_datacenter(device_type : Union[str, DeviceTypeEnum]) -> bool:
    return device_type in {
        DeviceTypeEnum.DATACENTER, DeviceTypeEnum.DATACENTER.value,
        DeviceTypeEnum.EMULATED_DATACENTER, DeviceTypeEnum.EMULATED_DATACENTER.value
    }

def device_type_is_network(device_type : Union[str, DeviceTypeEnum]) -> bool:
    return device_type in {DeviceTypeEnum.NETWORK, DeviceTypeEnum.NETWORK.value}

def endpoint_type_is_border(endpoint_type : str) -> bool:
    return str(endpoint_type).endswith('/border')