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#
# The MIT License (MIT)
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import sys

try:
    from autobahn import xbr  # noqa
    HAS_XBR = True
except ImportError as e:
    sys.stderr.write('WARNING: could not import autobahn.xbr - {}\n'.format(e))
    HAS_XBR = False


if HAS_XBR:
    import txaio
    txaio.use_twisted()
    from twisted.internet.threads import deferToThread
    from twisted.internet.task import LoopingCall
    from twisted.internet.defer import ensureDeferred

    import uuid

    from autobahn.util import hl
    from autobahn.xbr._interfaces import IProvider, ISeller, IConsumer, IBuyer, IDelegate
    from autobahn.xbr import _seller, _buyer, _blockchain

    class SimpleBlockchain(_blockchain.SimpleBlockchain):
        log = txaio.make_logger()
        backgroundCaller = deferToThread

    class KeySeries(_seller.KeySeries):
        log = txaio.make_logger()

        def __init__(self, api_id, price, interval=None, count=None, on_rotate=None):
            super().__init__(api_id, price, interval, count, on_rotate)
            self.running = False
            self._run_loop = None
            self._started = None

        async def start(self):
            """
            Start offering and selling data encryption keys in the background.
            """
            assert self._run_loop is None

            self.log.info('Starting key rotation every {interval} seconds for api_id="{api_id}" ..',
                          interval=hl(self._interval), api_id=hl(uuid.UUID(bytes=self._api_id)))

            self.running = True

            self._run_loop = LoopingCall(lambda: ensureDeferred(self._rotate()))
            self._started = self._run_loop.start(self._interval)

            return self._started

        def stop(self):
            """
            Stop offering/selling data encryption keys.
            """
            if not self._run_loop:
                raise RuntimeError('cannot stop {} - not currently running'.format(self.__class__.__name__))

            self._run_loop.stop()
            self._run_loop = None

            return self._started

    class SimpleSeller(_seller.SimpleSeller):
        """
        Simple XBR seller component. This component can be used by a XBR seller delegate to
        handle the automated selling of data encryption keys to the XBR market maker.
        """
        log = txaio.make_logger()
        KeySeries = KeySeries

    class SimpleBuyer(_buyer.SimpleBuyer):
        log = txaio.make_logger()

    ISeller.register(SimpleSeller)
    IProvider.register(SimpleSeller)
    IDelegate.register(SimpleSeller)
    IBuyer.register(SimpleBuyer)
    IConsumer.register(SimpleBuyer)
    IDelegate.register(SimpleBuyer)