#!/usr/bin/env python
# vim: set fileencoding=utf-8 :

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"""Starts the worker process (%(version)s)

Based on the Majordomo Protocol broker example of the ZMQ Guide.

Usage:
  %(prog)s [-v ... | --verbose ...] <port>
  %(prog)s (--help | -h)
  %(prog)s (--version | -V)


Options:
  -h, --help                 Show this screen
  -V, --version              Show version
  -v, --verbose              Increases the output verbosity level
"""
import os
import sys

from docopt import docopt

from ..bcpapi.broker import BeatComputationBroker
from ..utils import setup_logging
from ..version import __version__


def run(port=5555, verbose=1, callbacks=None):
    """Start the broker

    Parameters:

        port (int): Port to use for tcp connection
        verbose (int): Level of verbosity
        callbacks (tuple): Pair of methods to call when workers are ready or gone
    """

    setup_logging(verbose, __name__, __name__)

    address = "tcp://*:{}".format(port)
    broker = BeatComputationBroker(verbose == 3)
    if callbacks:
        broker.set_worker_callbacks(*callbacks)
    broker.bind(address)
    broker.mediate()


def main(argv=None):
    if argv is None:
        argv = sys.argv[1:]

    prog = os.path.basename(sys.argv[0])
    completions = dict(prog=prog, version=__version__)
    args = docopt(
        __doc__ % completions,
        argv=argv,
        options_first=True,
        version="v%s" % __version__,
    )
    broker_port = args.pop("<port>")

    return run(broker_port, args["--verbose"])


if __name__ == "__main__":
    main()
