#!/usr/bin/env python3
import sys

oldexcepthook = sys.excepthook
def newexcepthook(type,value,traceback):
	oldexcepthook(type,value,traceback)
	#input("Press ENTER to quit.")
sys.excepthook = newexcepthook

import os
p = os.path.join
pUp = os.path.dirname
s = False
if getattr(sys, 'frozen', False) and hasattr(sys, '_MEIPASS'):
	s = os.path.realpath(sys.executable)
else:
	s = os.path.realpath(__file__)
sp = pUp(s)

# script start
import threading
import queue
import socket
import subprocess
import configparser
import time

connections = {}
connectionsId = 0
connectionsLock = threading.Lock()

threadCount = 0
threadCountLock = threading.Lock()

fileLock = threading.Lock()

serverAddr = ("127.0.0.1",61920)
serverSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

bufferSize = 10000 # Buffer size in bytes
timeout = 15 # How long to wait for a connection to respond before timing out?
maxClients = 20 # How many clients can be connected at maximum?
maxClientsPerIP = 3 # How many clients can be connected at maximum, per IP?
maxAccumulatedData = 50*1000*1000 # How much data can be in an outbound thread's queue at maximum before the connection is closed? The maximum amount of queue data is maxAccumulatedData * maxClients bytes.
maxInboundTransferRate = 0 # Maximum upload speed for broadcasters. This sucks right now. Set to 0 to disable.

def addThread():
	global threadCount
	with threadCountLock:
		threadCount += 1
		print("Thread opened. Threads: " +str(threadCount)+ " (Actual: " +str(threading.active_count())+ ")")

def removeThread():
	global threadCount
	with threadCountLock:
		threadCount -= 1
		print("Thread closed. Threads: " +str(threadCount)+ " (Actual: " +str(threading.active_count())+ ")")

def commandToList(cmd):
	args = []
	cArg = ""
	escape = False
	quoted = False
	for letter in cmd:
		if escape == True:
			cArg += letter
			escape = False
			continue
		
		if letter == "\\":
			escape = True
			continue
		
		#if quoted == False and letter == ",":
		if letter == ",":
			if cArg == "": continue
			args.append(cArg)
			cArg = ""
			continue
		
		#if letter == '"':
		#	quoted = not quoted
		#	continue
		
		cArg += letter
	
	args.append(cArg)
	
	return args

def closeConnection(connectionId):
	if connectionId in connections:
		del connections[connectionId]

class outThread(threading.Thread):
	def __init__(self,connectionId):
		threading.Thread.__init__(self)
		self.queue = queue.Queue()
		self.connectionId = connectionId
	
	def getConnection(self):
		with connectionsLock:
			if self.connectionId in connections:
				return connections[self.connectionId]["connection"]
			return False
	
	def run(self):
		try:
			while True:
				data = self.queue.get(timeout=15)
				connection = self.getConnection()
				if not connection:
					removeThread()
					return
				connection.sendall(data)
			with connectionsLock: closeConnection(self.connectionId)
			removeThread()
			return
		except:
			with connectionsLock: closeConnection(self.connectionId)
			removeThread()
			print("Thread closed - Exception:")
			raise

class inThread(threading.Thread):
	def __init__(self,connectionId):
		threading.Thread.__init__(self)
		self.connectionId = connectionId
	
	def getConnection(self):
		with connectionsLock:
			if self.connectionId in connections:
				return connections[self.connectionId]["connection"]
			return False
	
	def run(self):
		try:
			connection = self.getConnection()
			if not connection:
				removeThread()
				return
			data = connection.recv(1000)
			if data == b"":
				with connectionsLock: closeConnection(self.connectionId)
				print("Thread closed - Client disconnected.")
				removeThread()
				return
			data = data.decode("utf-8")
			while data[-1] == " ": data = data[:-1]
			args = commandToList(data)
			cmd = args.pop(0)
			
			user = args[0]
			self.user = user
			password = False
			if len(args) > 1:
				password = args[1]
			
			userPath = p(sp,"users",user+ ".ini")
			with fileLock:
				if not os.path.isfile(userPath):
					with connectionsLock: closeConnection(self.connectionId)
					print("Thread closed - Invalid user given: " +user)
					removeThread()
					return
			
				config = configparser.ConfigParser()
				config.read(userPath)
			
			if cmd == "watch":
				if cmd in config and "pass" in config[cmd] and config[cmd]["pass"] != "" and config[cmd]["pass"] != password:
					with connectionsLock: closeConnection(self.connectionId)
					print("Thread closed - Invalid password given for user: " +user)
					removeThread()
					return
				
				with connectionsLock:
					if not self.connectionId in connections:
						removeThread()
						return
					connections[self.connectionId]["action"] = "watch"
					connections[self.connectionId]["user"] = user
					thread = outThread(self.connectionId)
					connections[self.connectionId]["outThread"] = thread
					thread.start()
					addThread()
					connections[self.connectionId]["inThread"] = False
					removeThread()
					return
			
			if cmd == "broadcast":
				if cmd in config and "pass" in config[cmd] and config[cmd]["pass"] != "" and config[cmd]["pass"] != password:
					with connectionsLock: closeConnection(self.connectionId)
					print("Thread closed - Invalid password given for user: " +user)
					removeThread()
					return
				
				with connectionsLock:
					deleteList = []
					for connectionId in connections:
						if connectionId == self.connectionId: continue
						if connections[connectionId]["action"] != "broadcast": continue
						if connections[connectionId]["user"] != user: continue
						deleteList.append(connectionId)
					
					for connectionId in deleteList:
						closeConnection[connectionId]
					
					connections[connectionId]["action"] = "broadcast"
					connections[connectionId]["user"] = user
				
				if maxInboundTransferRate > 0: startTime = time.time()
				while True:
					connection = self.getConnection()
					if not connection:
						removeThread()
						return
					data = connection.recv(bufferSize)
					if data == b"":
						with connectionsLock: closeConnection(self.connectionId)
						print("Thread closed - Client disconnected.")
						removeThread()
						return
					
					with connectionsLock:
						for connectionId in connections:
							connectionData = connections[connectionId]
							thread = connectionData["outThread"]
							if not thread: continue
							if connectionData["user"] != user: continue
							accumulatedData = thread.queue.qsize() * bufferSize
							if accumulatedData > maxAccumulatedData:
								print("Thread closed - Too much accumulated data.")
								closeConnection(connectionId)
								removeThread()
								return
							
							thread.queue.put(data)
					
					if maxInboundTransferRate > 0:
						endTime = time.time()
						timeTaken = endTime - startTime
						if timeTaken <= 0: timeTaken = 0.00001 # this isn't good enough
						transferSpeed = bufferSize / timeTaken
						if transferSpeed > maxInboundTransferRate:
							maxSleep = (bufferSize/maxInboundTransferRate) - timeTaken
							if maxSleep > 0:
								sleepTime = (transferSpeed / maxInboundTransferRate) - 1
								if sleepTime > maxSleep: sleepTime = maxSleep
								time.sleep(sleepTime)
						
						startTime = endTime
			
			with connectionsLock: closeConnection(self.connectionId)
			removeThread()
			return
		except:
			with connectionsLock: closeConnection(self.connectionId)
			removeThread()
			print("Thread closed - Exception:")
			raise

class debugThread(threading.Thread):
	def __init__(self):
		threading.Thread.__init__(self)
	
	def run(self):
		while True:
			with connectionsLock:
				print("\n---\n")
				print("Threads - IN:  " +str(len(inThreads)))
				print("Threads - OUT: " +str(len(outThreads)))
				print("\nACCUMULATED DATA:")
				for threadId in outThreads:
					thread = outThreads[threadId]
					print(threadId + ": " + str(thread.queue.qsize() * bufferSize))
				
				print("\nCONNECTIONS:")
				connCount = 0
				connCountIp = {}
				with connectionsLock:
					for connId in connections:
						conn = connections[connId]
						ip = conn[1][0]
						if not ip in connCountIp:
							connCountIp[ip] = 0
						connCountIp[ip] += 1
						connCount += 1
				
				for ip in connCountIp:
					print(ip+ ": " +str(connCountIp[ip]))
				
				print("Overall: " +str(connCount))
				
			time.sleep(1)

def readConfig():
	config = configparser.ConfigParser()
	config.read(p(os.path.splitext(s)[0] + ".ini"))
	global serverAddr
	serverAddrSplit = config["default"]["serverAddr"].rsplit(":",1)
	serverAddrSplit[1] = int(serverAddrSplit[1])
	serverAddr = tuple(serverAddrSplit)

def main():
	global connectionsId
	readConfig()
	
	serverSocket.bind(serverAddr)
	serverSocket.listen(1024)
	
	# DEBUG
	#debug = debugThread()
	#debug.start()
	# DEBUG END
	
	while True:
		connection, address = serverSocket.accept()
		connection.settimeout(timeout)
		
		with connectionsLock:
			clientCount = 0
			ipClientCount = 0
			for connectionId in connections:
				clientCount += 1
				if connections[connectionId]["address"][0] == address[0]:
					ipClientCount += 1
		
			if clientCount + 1 > maxClients:
				print("Connection closed - too many clients.")
				closeConnection(connectionId)
				continue
			
			if ipClientCount + 1 > maxClientsPerIP:
				print("Connection closed - same IP connected too many times.")
				closeConnection(connectionId)
				continue
			
			connectionsId += 1
			threadIn = inThread(str(connectionsId))
			connections[str(connectionsId)] = {
				"connection": connection,
				"address":    address,
				"inThread":   threadIn,
				"outThread":  False,
				"action":     False,
				"user":       False
			}
			
			threadIn.start()
			addThread()

if __name__ == '__main__':
	main()