'''
BBS.py

A BBS that was shamelessly based entirely on the blog post found: https://www.fsxnet.nz/tutorials/bbs/python-bbs/start
'''
import configparser
import sys
import socket
import threading

 
from comms import comms
 
nodes = []
 
class bbsServer():
    def __init__(self, port, host='0.0.0.0', nodemax=1):
        self.port = port
        self.host = host
        self.server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        # try:
        config = configparser.ConfigParser()
        config.read("config.ini")
        self.nodemax = config.getint("Main","MaxConnections")
        # except:
            # self.nodemax = nodemax
 
        for index in range(nodemax):
            nodes.append(False)
 
        try:
            self.server.bind((self.host, self.port))
        except socket.error:
            print("Couldn't bind %s" % (socket.error))
            sys.exit()
 
        self.server.listen(10)
 
    def run_thread(self, conn, addr, node):
        global nodes
 
        try:
            comms(conn, addr, node + 1)
 
        except (RuntimeError, OSError):
            print("Node %s hung up..." % (node + 1))
 
        print("Node %s offline." % (node + 1))
        nodes[node] = False
        conn.close()
        sys.exit()
 
    def run(self):
        print("Starting BBS on port %s" % (self.port))
 
        while True:
            conn, addr = self.server.accept()
 
            for index in range(self.nodemax):
                if nodes[index] == False:
 
                    nodes[index] = True
                    threading.Thread(target=self.run_thread, args=(conn, addr, index)).start()
                    break
                else:
                    conn.sendall("BUSY\r\n")
                    conn.close()
 
if __name__ == "__main__":
 
    if len(sys.argv) < 2:
 
        print("Usage python bbs.py config.ini")
        exit(1)
 
    config = configparser.ConfigParser()
    config.read(sys.argv[1])
 
    server = bbsServer(config.getint("Main", "Port"))
 
    server.run()