# TCPServer.py

from socket import *
import sys

args = sys.argv
if len(args) != 2:
    print "Usage: python TCPServer.py port"
    exit()
port = int(args[1])

# Create welcoming socket using the given port
welcomeSocket = socket(AF_INET, SOCK_STREAM)
welcomeSocket.bind(('', port))
welcomeSocket.listen(1)

print 'Listening on port', port, '...'

# While loop to handle arbitrary sequence of clients making requests
while 1:
    # Waits for some client to connect and creates new socket
    # for connection
    connectionSocket, addr = welcomeSocket.accept()
    print 'Client Made Connection'
    
    # Read input line from socket
    clientSentence = connectionSocket.recv(1024)
    print 'FROM CLIENT:', clientSentence

    # Capitalize the sentence
    serverSentence = clientSentence.upper()

    # Write output line to socket
    connectionSocket.send(serverSentence)
    print 'TO CLIENT', serverSentence
    
    # Close the connection socket
    connectionSocket.close()