###############################################################################
#
# The MIT License (MIT)
#
# Copyright (c) typedef int GmbH
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# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
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# copies of the Software, and to permit persons to whom the Software is
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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import decimal
import sys
from os import environ

from autobahn import wamp
from autobahn.twisted.wamp import ApplicationRunner, ApplicationSession
from twisted.internet.defer import inlineCallbacks


class Calculator(ApplicationSession):
    @inlineCallbacks
    def onJoin(self, details):
        self.clear()
        yield self.register(self)
        print("Ok, calculator procedures registered!")

    @wamp.register("com.example.calculator.clear")
    def clear(self, arg=None):
        self.op = None
        self.current = decimal.Decimal(0)
        return str(self.current)

    @wamp.register("com.example.calculator.calc")
    def calc(self, op, num):
        num = decimal.Decimal(num)
        if self.op:
            if self.op == "+":
                self.current += num
            elif self.op == "-":
                self.current -= num
            elif self.op == "*":
                self.current *= num
            elif self.op == "/":
                self.current /= num
            self.op = op
        else:
            self.op = op
            self.current = num

        res = str(self.current)
        if op == "=":
            self.clear()

        return res


if __name__ == "__main__":
    decimal.getcontext().prec = 20

    import argparse
    import sys

    # parse command line arguments
    parser = argparse.ArgumentParser()

    parser.add_argument(
        "--web",
        type=int,
        default=8080,
        help="Web port to use for embedded Web server. Use 0 to disable.",
    )

    parser.add_argument(
        "--router",
        type=str,
        default=None,
        help="If given, connect to this WAMP router. Else run an embedded router on 9000.",
    )

    args = parser.parse_args()

    from twisted.python import log

    log.startLogging(sys.stdout)

    # run WAMP application component
    from autobahn.twisted.wamp import ApplicationRunner

    runner = ApplicationRunner(
        environ.get("AUTOBAHN_DEMO_ROUTER", "ws://127.0.0.1:8080/ws"),
        "crossbardemo",
    )
    runner.run(Calculator)
