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#
# The MIT License (MIT)
#
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# of this software and associated documentation files (the "Software"), to deal
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from os import environ
import math

try:
    import asyncio
except ImportError:
    # Trollius >= 0.3 was renamed
    import trollius as asyncio

from autobahn import wamp
from autobahn.wamp.exception import ApplicationError
from autobahn.asyncio.wamp import ApplicationSession, ApplicationRunner


@wamp.error(u"com.myapp.error1")
class AppError1(Exception):
    """
    An application specific exception that is decorated with a WAMP URI,
    and hence can be automapped by Autobahn.
    """


class Component(ApplicationSession):
    """
    Example WAMP application backend that raised exceptions.
    """

    @asyncio.coroutine
    def onJoin(self, details):

        # raising standard exceptions
        ##
        def sqrt(x):
            if x == 0:
                raise Exception("don't ask foolish questions;)")
            else:
                # this also will raise, if x < 0
                return math.sqrt(x)

        yield from self.register(sqrt, u'com.myapp.sqrt')

        # raising WAMP application exceptions
        ##
        def checkname(name):
            if name in ['foo', 'bar']:
                raise ApplicationError(u"com.myapp.error.reserved")

            if name.lower() != name.upper():
                # forward positional arguments in exceptions
                raise ApplicationError(u"com.myapp.error.mixed_case", name.lower(), name.upper())

            if len(name) < 3 or len(name) > 10:
                # forward keyword arguments in exceptions
                raise ApplicationError(u"com.myapp.error.invalid_length", min=3, max=10)

        yield from self.register(checkname, u'com.myapp.checkname')

        # defining and automapping WAMP application exceptions
        ##
        self.define(AppError1)

        def compare(a, b):
            if a < b:
                raise AppError1(b - a)

        yield from self.register(compare, u'com.myapp.compare')


if __name__ == '__main__':
    runner = ApplicationRunner(
        environ.get("AUTOBAHN_DEMO_ROUTER", u"ws://127.0.0.1:8080/ws"),
        u"crossbardemo",
    )
    runner.run(Component)