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import argparse
import platform
import sys

import txaio

txaio.use_twisted()

import autobahn
from autobahn.twisted.websocket import WebSocketServerFactory, WebSocketServerProtocol
from autobahn.websocket.compress import (
    PerMessageDeflateOffer,
    PerMessageDeflateOfferAccept,
)
from autobahn.websocket.util import parse_url
from twisted.internet import reactor

# FIXME: streaming mode API is currently incompatible with permessage-deflate!
USE_STREAMING_TESTEE = False


class TesteeServerProtocol(WebSocketServerProtocol):
    """
    A message-based WebSocket echo server.
    """

    def onMessage(self, payload, isBinary):
        self.sendMessage(payload, isBinary)


class StreamingTesteeServerProtocol(WebSocketServerProtocol):
    """
    A streaming WebSocket echo server.
    """

    def onMessageBegin(self, isBinary):
        WebSocketServerProtocol.onMessageBegin(self, isBinary)
        self.beginMessage(isBinary)

    def onMessageFrameBegin(self, length):
        WebSocketServerProtocol.onMessageFrameBegin(self, length)
        self.beginMessageFrame(length)

    def onMessageFrameData(self, payload):
        self.sendMessageFrameData(payload)

    def onMessageFrameEnd(self):
        pass

    def onMessageEnd(self):
        self.endMessage()


class TesteeServerFactory(WebSocketServerFactory):
    log = txaio.make_logger()

    if USE_STREAMING_TESTEE:
        protocol = StreamingTesteeServerProtocol
    else:
        protocol = TesteeServerProtocol

    def __init__(self, url):
        testee_ident = autobahn.twisted.__ident__
        self.log.info(
            "Testee identification: {testee_ident}", testee_ident=testee_ident
        )
        WebSocketServerFactory.__init__(self, url, server=testee_ident)

        self.setProtocolOptions(failByDrop=False)  # spec conformance
        # self.setProtocolOptions(utf8validateIncoming = False)

        if USE_STREAMING_TESTEE:
            self.setProtocolOptions(failByDrop=True)  # needed for streaming mode
        else:
            # enable permessage-deflate WebSocket protocol extension
            def accept(offers):
                for offer in offers:
                    if isinstance(offer, PerMessageDeflateOffer):
                        return PerMessageDeflateOfferAccept(offer)

            self.setProtocolOptions(perMessageCompressionAccept=accept)


if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Autobahn Testee Server (Twisted)")
    parser.add_argument(
        "--url",
        dest="url",
        type=str,
        default="ws://127.0.0.1:9001",
        help="The WebSocket fuzzing server URL.",
    )
    parser.add_argument(
        "--loglevel",
        dest="loglevel",
        type=str,
        default="info",
        help='Log level, eg "info" or "debug".',
    )

    options = parser.parse_args()

    txaio.start_logging(level=options.loglevel)

    factory = TesteeServerFactory(options.url)

    _, _, port, _, _, _ = parse_url(options.url)

    reactor.listenTCP(port, factory)
    reactor.run()
