import asyncio
import threading
from scapy.all import *
import argparse

DEBUG=False

def print_dbg(s):
    if DEBUG:
        print(s)

class NGServer:
    def __init__(self, bridge_ip='127.0.0.1', bridge_port=8000,
            ioip='127.0.0.1', 
            incoming_port=8001, outgoing_port=8002):
        self.incoming_queue = asyncio.Queue()
        self.outgoing_queue = asyncio.Queue()
        self.client_reader = None
        self.client_writer = None
        self.server_reader = None
        self.server_writer = None
        self.server_thread = None

        self.bridge_ip = bridge_ip
        self.bridge_port = bridge_port
        self.ioip = ioip
        self.incoming_port = incoming_port
        self.outgoing_port = outgoing_port

    async def handle_client(self, reader, writer):
        self.client_reader = reader
        self.client_writer = writer
        while True:
            data = await reader.read(1024)
            if not data:
                writer.close()
                break
            await self.incoming_queue.put(data)

    async def handle_incoming(self, reader, writer):
        while True:
            data = await self.incoming_queue.get()
            writer.write(data)
            await writer.drain()

    async def handle_outgoing(self, reader, writer):
        self.server_reader = reader
        self.server_writer = writer
        print_dbg("handle_outgoing - ENTER")
        while True:
            print_dbg("handle_outgoing - IN LOOP")
            data = await reader.read(1024)
            print_dbg("handle_outgoing - IP(data))={}".format(
                IP(data)))
            self.client_writer.write(data)
            await self.client_writer.drain()

    async def read_from_server(self):
        print_dbg("read_from_server - ENTER")
        while True:
            # Switch reader to writer
            print_dbg("read_from_server - IN LOOP")
            data = await self.client_reader.read(1024)
            print_dbg("read_from_server - IP(data))={}".format(
                IP(data)))
            if not data:
                self.client_writer.close()
                break
            await self.outgoing_queue.put(data)

    async def start_server(self):
        server = await asyncio.start_server(
                self.handle_client,
                host=self.bridge_ip,
                port=self.bridge_port)
        async with server:
            await server.serve_forever()

    async def start_incoming_server(self):
        server = await asyncio.start_server(
                self.handle_incoming,
                host=self.ioip,
                port=self.incoming_port)
        async with server:
            await server.serve_forever()

    async def start_outgoing_server(self):
        server = await asyncio.start_server(
                self.handle_outgoing,
                host=self.ioip,
                port=self.outgoing_port)
        async with server:
            await server.serve_forever()

async def start_thread(ng):
    """ """
    await asyncio.gather(
        ng.start_server(),
        ng.start_incoming_server(),
        ng.start_outgoing_server(),
        )

    await asyncio.gather(
        ng.read_from_server(),
        ng.handle_incoming(),
        ng.handle_outgoing(),
        )

def run_thread(ng):
    asyncio.run(start_thread(ng))


def startServerAndWait(args):
    ng = NGServer(bridge_ip=args.bridge_ip,
            bridge_port=args.bridge_port,
            ioip=args.ioip,
            incoming_port=args.incoming_port,
            outgoing_port=args.outgoing_port)
    ng.server_thread = threading.Thread(
            target=run_thread,
            args=(ng,))
    ng.server_thread.start()
    ng.server_thread.join()

def startThread(ng):

    ng.server_thread = threading.Thread(
            target=run_thread,
            args=(ng,))
    ng.server_thread.start()

def connectIO(inaddr='127.0.0.1', inport=8001, outaddr='127.0.0.1', outport=8002):
    insock = socket.socket(socket.AF_INET, socket.SOCK_STREAM, socket.IPPROTO_TCP)
    insock.connect((inaddr, inport))
    outsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM, socket.IPPROTO_TCP)
    outsock.connect((outaddr, outport))
    return insock, outsock


def parseArgs():
    args = argparse.ArgumentParser()
    # The bridge ip and port
    args.add_argument("-B","--bridge_ip", default='127.0.0.1',
            help='The IP that listens for NetGenie mobile app client connections.')
    args.add_argument("-b","--bridge_port", default=8000, help='The port that listens for NetGenie mobile app client connections.')

    # The IO ip and ports
    args.add_argument("-I","--ioip", default='127.0.0.1', help='The IP that listens on the server for connections from whoever is debugging the phone.')
    args.add_argument("-i","--incoming_port", default=8001,
            help='The port that the person debugging will read packets from the device.')
    args.add_argument("-o","--outgoing_port", default=8002,
            help='The port that the person debugging will write packets to the device.')
    return args.parse_args()


def main():
    """
    The NGServer class implements our NetGenie debug/bridge server.

    """
    args = parseArgs()
    startServerAndWait(args)

if __name__ == '__main__':
    main()