import os
import sys
import json
import socket
import threading


import prot_codec as pc







# tcp服务端脚本
# 一个连接远端转发服务器
# 另一个连接本地tcp服务器


_remote_client=None
_local_client=[]


# LOCAL_SERVER_IP = ("192.168.3.166",80)
# LOCAL_SERVER_IP = ("192.168.3.167",22)
LOCAL_SERVER_IP = ("10.0.24.251",80)



# 发送数据到指定ip地址和端口
def send_to(ip,port,data:bytearray):
  for item in _local_client:
    if(item[1]==ip and item[2]==port):
      print(f"recv from remote {ip},{port}")
      item[0].send(data)
      break

# 关闭指定地址的端口
def close(ip,port):
  for item in _local_client:
    if(item[1]==ip and item[2]==port):
      print(f"remote close:{ip},{port}")
      item[0].close()
      break

# 关闭所有
def close_all():
  for item in _local_client:
    item[0].close()
  print('remote close all')



# 本地数据处理，解包，把负载数据发送到本地服务器
def local_client_handler(tcp_server:socket,ip,port):
  global _remote_client
  global _local_client
  self_info=(tcp_server,ip,port)
  _local_client.append(self_info)
  while True:
    try:
      recv = tcp_server.recv(4096)
    except Exception as e:
      print("local:",str(e))
      break
    if recv:
      cmd={'device':'server','option':'data','ip':ip,'port':port}
      data=pc.encode(json.dumps(cmd).encode('utf-8'),recv)
      if _remote_client is not None:
        _remote_client.send(data)
        print(f"send to remote {ip},{port}")

    else:
      break
  tcp_server.close()
  cmd={'device':'server','option':'disconnect','ip':ip,'port':port}
  data=pc.encode(json.dumps(cmd).encode('utf-8'),b'default')
  if _remote_client is not None:
    _remote_client.send(data)
  _local_client.remove(self_info)




# 远端数据处理，解包，把负载数据发送到本地服务器
def remote_client_handler(tcp_client_1:socket):
  global _remote_client
  global _local_client
  print("已连接代理服务器")
  cmd={'device':'server','option':'login'}
  data=pc.encode(json.dumps(cmd).encode('utf-8'),b'default')
  _remote_client.send(data)
  recv_data=bytearray()
  while True:
    try:
      recv = tcp_client_1.recv(4096)
    except Exception as e:
      print("remote:",str(e))
      break
    if recv:
      recv_data+=recv
      while True:
        start=recv_data.find(b'\xff')
        end=recv_data.find(b'\xfe')
        if(start == -1 or end == -1):
          break
        cmd,data=pc.decode(recv_data[start:end+1])
        print(cmd.decode('utf-8'))
        try:
          j=json.loads(cmd)
          if(j['device']=='client'):
            if(j['option']=='connect'):
              temp = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
              temp.connect(LOCAL_SERVER_IP)
              thd = threading.Thread(target = local_client_handler, args = (temp,j['ip'],j['port']))
              thd.start()
            elif(j['option']=='disconnect'):
              close(j['ip'],j['port'])
            elif(j['option']=='data'):
              send_to(j['ip'],j['port'],data)
          elif(j['device']=='proxy'):
            if(j['option']=='close'):
              close_all()
        except Exception as e:
          print(str(e))
        recv_data=recv_data[end+1:]
    else:
      break
  tcp_client_1.close()
  print("proxy close.")
  close_all()


def main():
  global _remote_client
  global _local_client

  _remote_client = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
  _remote_client.connect(("1.92.113.30",5345))
  # thd = threading.Thread(target = remote_client_handler, args = (_remote_client,))
  # thd.start()
  # thd.join()

  remote_client_handler(_remote_client)





if __name__ == "__main__":
  main()