# Copyright 2022-2024 ETSI OSG/SDG TeraFlowSDN (TFS) (https://tfs.etsi.org/)
#
# 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 grpc, json, logging

from flask import current_app, render_template, Blueprint, flash, session, redirect, url_for
from common.proto.context_pb2 import Empty, Link, LinkId, LinkList
from common.proto.qkd_app_pb2 import App, QKDAppStatusEnum, QKDAppTypesEnum
from common.tools.context_queries.Context import get_context
from common.tools.context_queries.Device import get_device
from common.tools.context_queries.Topology import get_topology
from context.client.ContextClient import ContextClient
from app.client.QKDAppClient import QKDAppClient


LOGGER = logging.getLogger(__name__)
app = Blueprint('qkd_app', __name__, url_prefix='/app')

qkd_app_client = QKDAppClient()
context_client = ContextClient()

@app.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()
    device_names = dict()

    context_obj = get_context(context_client, context_uuid, rw_copy=False)
    if context_obj is None:
        flash('Context({:s}) not found'.format(str(context_uuid)), 'danger')
        apps = list()
    else:
        try:
            apps = qkd_app_client.ListApps(context_obj.context_id)
            apps = apps.apps
        except grpc.RpcError as e:
            if e.code() != grpc.StatusCode.NOT_FOUND: raise
            if e.details() != 'Context({:s}) not found'.format(context_uuid): raise
            apps = list()
        else:
            # Too many requests to context_client if it has too many apps (update in the future)
            for app in apps:
                if app.local_device_id.device_uuid.uuid not in device_names:
                    device = get_device(context_client, app.local_device_id.device_uuid.uuid)
                    if device is not None:
                        device_names[app.local_device_id.device_uuid.uuid] = device.name
                
                if app.remote_device_id.device_uuid.uuid and app.remote_device_id.device_uuid.uuid not in device_names:
                    device = get_device(context_client, app.remote_device_id.device_uuid.uuid)
                    if device is not None:
                        device_names[app.remote_device_id.device_uuid.uuid] = device.name

    context_client.close()
    return render_template(
        'app/home.html', apps=apps, device_names=device_names, ate=QKDAppTypesEnum, ase=QKDAppStatusEnum)


@app.route('detail/<path:app_uuid>', methods=('GET', 'POST'))
def detail(app_uuid: str):
    '''
    context_client.connect()
    link_obj = get_link(context_client, link_uuid, rw_copy=False)
    if link_obj is None:
        flash('Link({:s}) not found'.format(str(link_uuid)), 'danger')
        link_obj = Link()
        device_names, endpoints_data = dict(), dict()
    else:
        device_names, endpoints_data = get_endpoint_names(context_client, link_obj.link_endpoint_ids)
    context_client.close()
    return render_template('link/detail.html',link=link_obj, device_names=device_names, endpoints_data=endpoints_data)
    '''
    pass

@app.get('<path:app_uuid>/delete')
def delete(app_uuid):
    '''
    try:

        # first, check if link exists!
        # request: LinkId = LinkId()
        # request.link_uuid.uuid = link_uuid
        # response: Link = client.GetLink(request)
        # TODO: finalize implementation

        request = LinkId()
        request.link_uuid.uuid = link_uuid # pylint: disable=no-member
        context_client.connect()
        context_client.RemoveLink(request)
        context_client.close()

        flash(f'Link "{link_uuid}" deleted successfully!', 'success')
    except Exception as e: # pylint: disable=broad-except
        flash(f'Problem deleting link "{link_uuid}": {e.details()}', 'danger')
        current_app.logger.exception(e)
    return redirect(url_for('link.home'))
    '''
    pass
