# Copyright (c) 2018, ZIH, Technische Universitaet Dresden, Federal Republic of Germany
#
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# are permitted provided that the following conditions are met:
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#       this list of conditions and the following disclaimer.
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#       may be used to endorse or promote products derived from this software
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from yarl import URL

from .client import Client
from .logging import get_logger

logger = get_logger(__name__)


class DataClient(Client):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        self.data_server_address = None
        self.data_connection = None
        self.data_channel = None
        self.data_exchange = None

    async def data_config(self, dataServerAddress, **kwargs):
        """
        You should not call this in child classes because it is a registered RPC handler
        """
        logger.debug("data_config(dataServerAddress={})", dataServerAddress)
        if not dataServerAddress:
            raise ValueError(
                "invalid dataServerAddress provided: {}".format(dataServerAddress)
            )
        dataServerAddress = self.add_credentials(dataServerAddress)
        if self.data_connection:
            if dataServerAddress != self.data_server_address:
                logger.error(
                    "attempting to change dataServerAddress on the fly, not supported."
                )
            logger.info("ignoring new config")
        else:
            logger.info(
                "setting up data connection to {}",
                URL(dataServerAddress).with_password("***"),
            )
            self.data_server_address = dataServerAddress
            self.data_connection = await self.make_connection(self.data_server_address)
            # publisher confirms seem to be buggy, disable for now
            self.data_channel = await self.data_connection.channel(
                publisher_confirms=False
            )
            # TODO configurable prefetch count
            await self.data_channel.set_qos(prefetch_count=400)

    async def stop(self):
        logger.info("closing data channel and connection.")
        if self.data_channel:
            await self.data_channel.close()
            self.data_channel = None
        if self.data_connection:
            await self.data_connection.close()
            self.data_connection = None
        self.data_exchange = None
        await super().stop()
