# 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 make_response
from flask.json import jsonify
from flask_restful import Resource
from common.orm.Database import Database
from common.tools.grpc.Tools import grpc_message_to_json
from context.proto.context_pb2 import ConnectionId, ContextId, DeviceId, Empty, LinkId, ServiceId, TopologyId
from context.service.grpc_server.ContextServiceServicerImpl import ContextServiceServicerImpl

def format_grpc_to_json(grpc_reply):
    return jsonify(grpc_message_to_json(grpc_reply))

def grpc_connection_id(connection_uuid):
    return ConnectionId(**{
        'connection_uuid': {'uuid': connection_uuid}
    })

def grpc_context_id(context_uuid):
    return ContextId(**{
        'context_uuid': {'uuid': context_uuid}
    })

def grpc_device_id(device_uuid):
    return DeviceId(**{
        'device_uuid': {'uuid': device_uuid}
    })

def grpc_link_id(link_uuid):
    return LinkId(**{
        'link_uuid': {'uuid': link_uuid}
    })

def grpc_service_id(context_uuid, service_uuid):
    return ServiceId(**{
        'context_id': {'context_uuid': {'uuid': context_uuid}},
        'service_uuid': {'uuid': service_uuid}
    })

def grpc_topology_id(context_uuid, topology_uuid):
    return TopologyId(**{
        'context_id': {'context_uuid': {'uuid': context_uuid}},
        'topology_uuid': {'uuid': topology_uuid}
    })

class _Resource(Resource):
    def __init__(self, database : Database) -> None:
        super().__init__()
        self.database = database
        self.servicer = ContextServiceServicerImpl(self.database, None)

class ContextIds(_Resource):
    def get(self):
        return format_grpc_to_json(self.servicer.ListContextIds(Empty(), None))

class Contexts(_Resource):
    def get(self):
        return format_grpc_to_json(self.servicer.ListContexts(Empty(), None))

class Context(_Resource):
    def get(self, context_uuid : str):
        return format_grpc_to_json(self.servicer.GetContext(grpc_context_id(context_uuid), None))

class TopologyIds(_Resource):
    def get(self, context_uuid : str):
        return format_grpc_to_json(self.servicer.ListTopologyIds(grpc_context_id(context_uuid), None))

class Topologies(_Resource):
    def get(self, context_uuid : str):
        return format_grpc_to_json(self.servicer.ListTopologies(grpc_context_id(context_uuid), None))

class Topology(_Resource):
    def get(self, context_uuid : str, topology_uuid : str):
        return format_grpc_to_json(self.servicer.GetTopology(grpc_topology_id(context_uuid, topology_uuid), None))

class ServiceIds(_Resource):
    def get(self, context_uuid : str):
        return format_grpc_to_json(self.servicer.ListServiceIds(grpc_context_id(context_uuid), None))

class Services(_Resource):
    def get(self, context_uuid : str):
        return format_grpc_to_json(self.servicer.ListServices(grpc_context_id(context_uuid), None))

class Service(_Resource):
    def get(self, context_uuid : str, service_uuid : str):
        return format_grpc_to_json(self.servicer.GetService(grpc_service_id(context_uuid, service_uuid), None))

class DeviceIds(_Resource):
    def get(self):
        return format_grpc_to_json(self.servicer.ListDeviceIds(Empty(), None))

class Devices(_Resource):
    def get(self):
        return format_grpc_to_json(self.servicer.ListDevices(Empty(), None))

class Device(_Resource):
    def get(self, device_uuid : str):
        return format_grpc_to_json(self.servicer.GetDevice(grpc_device_id(device_uuid), None))

class LinkIds(_Resource):
    def get(self):
        return format_grpc_to_json(self.servicer.ListLinkIds(Empty(), None))

class Links(_Resource):
    def get(self):
        return format_grpc_to_json(self.servicer.ListLinks(Empty(), None))

class Link(_Resource):
    def get(self, link_uuid : str):
        return format_grpc_to_json(self.servicer.GetLink(grpc_link_id(link_uuid), None))

class ConnectionIds(_Resource):
    def get(self, context_uuid : str, service_uuid : str):
        return format_grpc_to_json(self.servicer.ListConnectionIds(grpc_service_id(context_uuid, service_uuid), None))

class Connections(_Resource):
    def get(self, context_uuid : str, service_uuid : str):
        return format_grpc_to_json(self.servicer.ListConnections(grpc_service_id(context_uuid, service_uuid), None))

class Connection(_Resource):
    def get(self, connection_uuid : str):
        return format_grpc_to_json(self.servicer.GetConnection(grpc_connection_id(connection_uuid), None))

class DumpText(Resource):
    def __init__(self, database : Database) -> None:
        super().__init__()
        self.database = database

    def get(self):
        db_entries = self.database.dump()
        num_entries = len(db_entries)
        response = ['----- Database Dump [{:3d} entries] -------------------------'.format(len(db_entries))]
        for db_entry in db_entries:
            response.append('  [{:>4s}] {:40s} :: {:s}'.format(*db_entry)) # pragma: no cover
        response.append('-----------------------------------------------------------')
        headers = {'Content-Type': 'text/plain'}
        return make_response('\n'.join(response), 200, headers)

class DumpHtml(Resource):
    def __init__(self, database : Database) -> None:
        super().__init__()
        self.database = database

    def get(self):
        db_entries = self.database.dump()
        num_entries = len(db_entries)
        response = []
        response.append('<HTML><HEAD><TITLE>Database Dump [{:3d} entries]</TITLE></HEAD><BODY>'.format(num_entries))
        response.append('<H3>Database Dump [{:3d} entries]</H3><HR/>'.format(num_entries))
        response.append('<TABLE border=1>')
        response.append('<TR><TH>Type</TH><TH>Key</TH><TH>Value</TH></TR>')
        for db_entry in db_entries:
            response.append('<TR><TD>{:s}</TD><TD>{:s}</TD><TD>{:s}</TD></TR>'.format(*db_entry))
        response.append('</TABLE></BODY></HTML>')

        headers = {'Content-Type': 'text/html'}
        return make_response(''.join(response), 200, headers)


# Use 'path' type in Service and Sink because service_uuid and link_uuid might contain char '/' and Flask is unable to
# recognize them in 'string' type.
RESOURCES = [
    # (endpoint_name, resource_class, resource_url)
    ('api.context_ids',    ContextIds,    '/context_ids'),
    ('api.contexts',       Contexts,      '/contexts'),
    ('api.context',        Context,       '/context/<string:context_uuid>'),

    ('api.topology_ids',   TopologyIds,   '/context/<string:context_uuid>/topology_ids'),
    ('api.topologies',     Topologies,    '/context/<string:context_uuid>/topologies'),
    ('api.topology',       Topology,      '/context/<string:context_uuid>/topology/<string:topology_uuid>'),

    ('api.service_ids',    ServiceIds,    '/context/<string:context_uuid>/service_ids'),
    ('api.services',       Services,      '/context/<string:context_uuid>/services'),
    ('api.service',        Service,       '/context/<string:context_uuid>/service/<path:service_uuid>'),

    ('api.device_ids',     DeviceIds,     '/device_ids'),
    ('api.devices',        Devices,       '/devices'),
    ('api.device',         Device,        '/device/<string:device_uuid>'),

    ('api.link_ids',       LinkIds,       '/link_ids'),
    ('api.links',          Links,         '/links'),
    ('api.link',           Link,          '/link/<path:link_uuid>'),

    ('api.connection_ids', ConnectionIds, '/context/<string:context_uuid>/service/<path:service_uuid>/connection_ids'),
    ('api.connections',    Connections,   '/context/<string:context_uuid>/service/<path:service_uuid>/connections'),
    ('api.connection',     Connection,    '/connection/<path:connection_uuid>'),

    ('api.dump.text',      DumpText,      '/dump/text'),
    ('api.dump.html',      DumpHtml,      '/dump/html'),
]