#!/usr/bin/python2

# sockets are the interface to network
# connections for programmers
import socket

# the regular expressions are needed
# to parse the protocol; see FGDP or
# https://docs.python.org/2/howto/regex.html
import re

# some global variables for configuration
username = "123456"
password = "random@rhrk.uni-kl.de"
chathost = "131.246.19.102"
chatport = 1337

# setup connection to the chat server
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.setblocking(True)
s.connect((chathost, chatport))

print "Note: Press CTRL+C to exit client.\n"

def primfaktoren(n):
    faktoren = []
    z = n
    while z > 1:
        # bestimme den kleinsten Primfaktor p von z
        i = 2
        gefunden = False
        while i*i <= n and not gefunden:
            if z % i == 0:
                gefunden = True
                p = i
            else:
                i = i + 1
        if not gefunden:
            p = z
        faktoren = faktoren + [p]
        z = z // p
    return faktoren

# line by line
for m in s.makefile():
    msg = re.match("^([0-9]+)(#(.+))?\r\n$", m)

    if msg is None:
        print "Warning: server sent message with unknown format:\n\t'%s'" % m
        continue # skip this message

    cmd, _, args = msg.groups()

    # server message
    if cmd == "0":
        print "Server: %s" % args

    # servers requests username
    elif cmd == "1":
        print "Server: %s" % args
        s.send("1#%s\r\n" % username)
        print "Client: My name is '%s'" % username

    # server requests password
    elif cmd == "2":
        print "Server: %s" % args
        s.send("2#%s\r\n" % password)
        print "Client: Password is '%s'" % password

    # logged in successfully
    elif cmd == "3":
        print "Server: %s" % args
        s.send("6\r\n") # request list of online users
        print "Client: Who's online?"

    # another user logged in
    elif cmd == "4":
        print "Server: User '%s' joined the chat." % args

    # another user logged out
    elif cmd == "5":
        print "Server: User '%s' left the chat." % args

    # list of online users
    elif cmd == "6":
        usrs = args.split("#")
        print "Server: Online users are "+", ".join(usrs)
        s.send("9\r\n")
        print "Client: Which exercises did I pass so far?"

    # message from another user
    elif cmd == "7":
        user, text = re.match("^(.+?)#(.+)$", args).groups()
        print "%s: %s" % (user, text)

    # list of all finished assignments
    elif cmd == "9":
        if (args == None):
            print "Server: You've not completed any task yet? Come ooooonn...."
            continue
        exs = args.split("#")
        print "Server: You've completed exercises "+", ".join(exs)
        s.send("10\r\n")

    elif cmd == "10":
        print "Server: " + args
        send = "11"
        for p in primfaktoren(int(args)):
            send += "#" + str(p)
        send += "\r\n"
        s.send(send)
        print "Client: " + send

    elif cmd == "11":
        print "Server: " + args

    # unknown message type
    else:
        print "Warning: Received unimplemented message of type %s." % cmd

print "Exiting..."