# Copyright (c) Microsoft. All rights reserved.
# Licensed under the MIT license. See LICENSE file in the project root for
# full license information.

import logging
from uuid import uuid4
import json
from .. import adapter_config
from urllib.parse import quote_plus
from connection_string import connection_string_to_dictionary, generate_auth_token
import uamqp

logger = logging.getLogger(__name__)


def _build_iothub_amqp_endpoint(config):
    hub_name = config["HostName"].split(".")[0]
    endpoint = "{}@sas.root.{}".format(config["SharedAccessKeyName"], hub_name)
    endpoint = quote_plus(endpoint)
    sas_token = generate_auth_token(
        config["HostName"],
        config["SharedAccessKeyName"],
        config["SharedAccessKey"] + "=",
    )
    endpoint = endpoint + ":{}@{}".format(quote_plus(sas_token), config["HostName"])
    return endpoint


class AmqpServiceClient:
    async def connect(self, service_connection_string):
        self.config = connection_string_to_dictionary(service_connection_string)
        self.endpoint = _build_iothub_amqp_endpoint(self.config)

        send_operation = "/messages/devicebound"
        send_target = "amqps://" + self.endpoint + send_operation
        logger.info("send target: {}".format(send_target))
        self.send_client = uamqp.async_ops.client_async.SendClientAsync(
            send_target, debug=True
        )

        self.blob_status_receive_client = None
        self.blob_status_receive_iter = None

        adapter_config.logger("AMQP service client connected")

    async def disconnect(self):
        if self.send_client:
            await self.send_client.close_async()
            self.send_client = None
            adapter_config.logger("AMQP send client disconnected")

        if self.blob_status_receive_client:
            await self.blob_status_receive_client.close_async()
            self.blob_status_receive_client = None
            adapter_config.logger("AMQP blob status receive client disconnected")

    async def send_to_device(self, device_id, message):
        msg_content = json.dumps(message)
        app_properties = {}
        msg_props = uamqp.message.MessageProperties()
        msg_props.to = "/devices/{}/messages/devicebound".format(device_id)
        msg_props.message_id = str(uuid4())
        amqp_message = uamqp.Message(
            msg_content, properties=msg_props, application_properties=app_properties
        )
        await self.send_client.send_message_async(amqp_message)
        adapter_config.logger("AMQP service client sent: {}".format(message))

    async def get_next_blob_status(self):
        if not self.blob_status_receive_client:
            blob_status_receive_operation = "/messages/serviceBound/filenotifications"
            blob_status_receive_source = (
                "amqps://" + self.endpoint + blob_status_receive_operation
            )

            logger.info(
                "blob status receive source: {}".format(blob_status_receive_source)
            )

            self.blob_status_receive_client = uamqp.async_ops.client_async.ReceiveClientAsync(
                blob_status_receive_source
            )
            self.blob_status_receive_iter = (
                self.blob_status_receive_client.receive_messages_iter_async()
            )

        async for message in self.blob_status_receive_iter:
            return message