# 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.

from flask import current_app, render_template, Blueprint, flash, session, redirect, url_for
from common.proto.context_pb2 import (
    ConfigActionEnum, ConfigRule,
    Device, DeviceDriverEnum, DeviceId, DeviceList, DeviceOperationalStatusEnum,
    Empty, TopologyId, ContextId)
from common.tools.object_factory.Context import json_context_id
from common.tools.object_factory.Topology import json_topology_id
from common.tools.context_queries.Device import add_device_to_topology
from context.client.ContextClient import ContextClient
from device.client.DeviceClient import DeviceClient
from webui.service.device.forms import AddDeviceForm
from common.DeviceTypes import DeviceTypeEnum
from webui.service.device.forms import ConfigForm
from webui.service.device.forms import UpdateDeviceForm

device = Blueprint('device', __name__, url_prefix='/device')
context_client = ContextClient()
device_client = DeviceClient()

@device.get('/')
def home():
    if 'context_uuid' not in session or 'topology_uuid' not in session:
        flash("Please select a context!", "warning")
        return redirect(url_for("main.home"))

    context_uuid = session['context_uuid']
    topology_uuid = session['topology_uuid']

    context_client.connect()
    json_topo_id = json_topology_id(topology_uuid, context_id=json_context_id(context_uuid))
    grpc_topology = context_client.GetTopology(TopologyId(**json_topo_id))
    topo_device_uuids = {device_id.device_uuid.uuid for device_id in grpc_topology.device_ids}
    grpc_devices: DeviceList = context_client.ListDevices(Empty())
    context_client.close()

    devices = [
        device for device in grpc_devices.devices
        if device.device_id.device_uuid.uuid in topo_device_uuids
    ]

    return render_template(
        'device/home.html', devices=devices, dde=DeviceDriverEnum,
        dose=DeviceOperationalStatusEnum)

@device.route('add', methods=['GET', 'POST'])
def add():
    form = AddDeviceForm()

    # listing enum values
    form.operational_status.choices = []
    for key, value in DeviceOperationalStatusEnum.DESCRIPTOR.values_by_name.items():
        form.operational_status.choices.append(
            (DeviceOperationalStatusEnum.Value(key), key.replace('DEVICEOPERATIONALSTATUS_', '')))

    # items for Device Type field
    for device_type in DeviceTypeEnum:
        form.device_type.choices.append((device_type.value,device_type.value))    

    if form.validate_on_submit():
        device = Device()
        # Device UUID: 
        device.device_id.device_uuid.uuid = form.device_id.data

        # Device type: 
        device.device_type = str(form.device_type.data)

        # Device configurations: 
        config_rule = device.device_config.config_rules.add()
        config_rule.action = ConfigActionEnum.CONFIGACTION_SET
        config_rule.custom.resource_key = '_connect/address'
        config_rule.custom.resource_value = form.device_config_address.data

        config_rule = device.device_config.config_rules.add()
        config_rule.action = ConfigActionEnum.CONFIGACTION_SET
        config_rule.custom.resource_key = '_connect/port'
        config_rule.custom.resource_value = form.device_config_port.data

        config_rule = device.device_config.config_rules.add()
        config_rule.action = ConfigActionEnum.CONFIGACTION_SET
        config_rule.custom.resource_key = '_connect/settings'
        config_rule.custom.resource_value = form.device_config_settings.data

        # Device status: 
        device.device_operational_status = form.operational_status.data

        # Device drivers: 
        if form.device_drivers_undefined.data:
            device.device_drivers.append(DeviceDriverEnum.DEVICEDRIVER_UNDEFINED)
        if form.device_drivers_openconfig.data:
            device.device_drivers.append(DeviceDriverEnum.DEVICEDRIVER_OPENCONFIG)
        if form.device_drivers_transport_api.data:
            device.device_drivers.append(DeviceDriverEnum.DEVICEDRIVER_TRANSPORT_API)
        if form.device_drivers_p4.data:
            device.device_drivers.append(DeviceDriverEnum.DEVICEDRIVER_P4)
        if form.device_drivers_ietf_network_topology.data:
            device.device_drivers.append(DeviceDriverEnum.DEVICEDRIVER_IETF_NETWORK_TOPOLOGY)
        if form.device_drivers_onf_tr_352.data:
            device.device_drivers.append(DeviceDriverEnum.DEVICEDRIVER_ONF_TR_352)
        if form.device_drivers_xr.data:
            device.device_drivers.append(DeviceDriverEnum.DEVICEDRIVER_XR)

        try:
            device_client.connect()
            response: DeviceId = device_client.AddDevice(device)
            device_client.close()
            context_uuid = session['context_uuid']
            topology_uuid = session['topology_uuid']
            context_client.connect()
            context_id = ContextId(**json_context_id(context_uuid))
            add_device_to_topology(context_client, context_id, topology_uuid, device.device_id.device_uuid.uuid)
            context_client.close()
            flash(f'New device was created with ID "{response.device_uuid.uuid}".', 'success')
            return redirect(url_for('device.home'))
        except Exception as e:
            flash(f'Problem adding the device. {e.details()}', 'danger')
        
    return render_template('device/add.html', form=form,
                        submit_text='Add New Device')

@device.route('detail/<path:device_uuid>', methods=['GET', 'POST'])
def detail(device_uuid: str):
    request = DeviceId()
    request.device_uuid.uuid = device_uuid
    context_client.connect()
    response = context_client.GetDevice(request)
    context_client.close()
    return render_template('device/detail.html', device=response,
                                                 dde=DeviceDriverEnum,
                                                 dose=DeviceOperationalStatusEnum)

@device.get('<path:device_uuid>/delete')
def delete(device_uuid):
    try:

        # first, check if device exists!
        # request: DeviceId = DeviceId()
        # request.device_uuid.uuid = device_uuid
        # response: Device = client.GetDevice(request)
        # TODO: finalize implementation

        request = DeviceId()
        request.device_uuid.uuid = device_uuid
        device_client.connect()
        response = device_client.DeleteDevice(request)
        device_client.close()

        flash(f'Device "{device_uuid}" deleted successfully!', 'success')
    except Exception as e:
        flash(f'Problem deleting device "{device_uuid}": {e.details()}', 'danger')
        current_app.logger.exception(e)
    return redirect(url_for('device.home'))

@device.route('<path:device_uuid>/addconfig', methods=['GET', 'POST'])
def addconfig(device_uuid):
    form = ConfigForm()
    request = DeviceId()
    request.device_uuid.uuid = device_uuid
    context_client.connect()
    response = context_client.GetDevice(request)
    context_client.close()

    if form.validate_on_submit():
        device = Device()
        device.CopyFrom(response)
        config_rule = device.device_config.config_rules.add()
        config_rule.action = ConfigActionEnum.CONFIGACTION_SET
        config_rule.custom.resource_key = form.device_key_config.data
        config_rule.custom.resource_value = form.device_value_config.data
        try:
            device_client.connect()
            response: DeviceId = device_client.ConfigureDevice(device)
            device_client.close()
            flash(f'New configuration was created with ID "{response.device_uuid.uuid}".', 'success')
            return redirect(url_for('device.home'))
        except Exception as e:
             flash(f'Problem adding the device. {e.details()}', 'danger')

    return render_template('device/addconfig.html', form=form,  submit_text='Add New Configuration')

@device.route('updateconfig', methods=['GET', 'POST'])
def updateconfig():

        
    return render_template('device/updateconfig.html')


@device.route('<path:device_uuid>/update', methods=['GET', 'POST'])
def update(device_uuid):
    form = UpdateDeviceForm()
    request = DeviceId()
    request.device_uuid.uuid = device_uuid
    context_client.connect()
    response = context_client.GetDevice(request)
    context_client.close()

    # listing enum values
    form.update_operational_status.choices = []
    for key, value in DeviceOperationalStatusEnum.DESCRIPTOR.values_by_name.items():
        form.update_operational_status.choices.append((DeviceOperationalStatusEnum.Value(key), key.replace('DEVICEOPERATIONALSTATUS_', '')))

    form.update_operational_status.default = response.device_operational_status

    if form.validate_on_submit():
        device = Device()
        device.CopyFrom(response)
        device.device_operational_status = form.update_operational_status.data
        try:
            device_client.connect()
            response: DeviceId = device_client.ConfigureDevice(device)
            device_client.close()
            flash(f'Status of device with ID "{response.device_uuid.uuid}" was updated.', 'success')
            return redirect(url_for('device.home'))
        except Exception as e:
             flash(f'Problem updating the device. {e.details()}', 'danger')  
    return render_template('device/update.html', device=response, form=form, submit_text='Update Device')