#!/usr/bin/python3

# file: server-clear.py
# date: 26.07.2019
# email: berhsi@web.de

# server, who listen for connections for localhost, port 64000 and ipv4.

import socket
from time import time, ctime
from sys import exit


def connection_handle(conn):

    data = conn.recv(1).decode()
    if data == '0' or data == '1':
        if update_status(data) == True:
            conn.send(data.encode())
        else:
            conn.send(b'3')
    else:
        print('Invalid argument')
        return False
    return True


def update_status(data):

    try:
        print('Update status ...')
        if data == '0':
            status = 'false'
        else:
            status = 'true'
        lastchange = str(time()).split('.')[0]
        print('Change status: {}: {}'.format(lastchange, status))
    except Exception as e:
        print('Error: {}'.format(e))
        return False
    return True


def main():

    HOST = '127.0.0.1'
    PORT = 64000
    
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0) as mySocket:
        print('Socket created')
        try:
            mySocket.bind((HOST, PORT))
            mySocket.listen(5)
            print('Listen on {} at Port {}'.format(HOST, PORT))
        except Exception as e:
            print('Error: unable to bind and listen')
            print('Error: {}'.format(e))
        while True:
            conn = None
            try:
                conn, addr = mySocket.accept()
                print('Connection from {}:{}'.format(addr[0], addr[1]))
                conn.settimeout(3.0)
                connection_handle(conn)
            except KeyboardInterrupt:
                print('\b\bExit')
                exit()
            except Exception as e:
                print('Error: {}'.format(e))
            finally:
                if conn:
                    conn.close()


if __name__ == '__main__':
    main()