import os
import sys
import json
import socket
import threading
import time


import prot_codec as pc



# tcp 客户端脚本
# 一个本地服务端
# 一个远程客户端



_LOCAL_PORT = 31234

_remote_client=None
_local_client=[]



# 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)
      return
  print(f"can not fond {ip},{port}")


# 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):
      item[0].close()
      break





# 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_remote:socket):
  global _remote_client
  global _local_client
  print("已连接代理服务器")
  recv_data=bytearray()
  cmd={'device':'client','option':'login'}
  data=pc.encode(json.dumps(cmd).encode('utf-8'),b'default')
  _remote_client.send(data)
  while True:
    try:
      recv = tcp_remote.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']=='server'):
            if(j['option']=='data'):
              send_to(j['ip'],j['port'],data)
            elif(j['option']=='disconnect'):
              close(j['ip'],j['port'])
        except Exception as e:
          print(str(e))
        recv_data=recv_data[end+1:]
    else:
      break
  tcp_remote.close()


# 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,addr):
  global _remote_client
  global _local_client
  print("addr:",addr)
  addr_info=(tcp_server,addr[0],addr[1])
  _local_client.append(addr_info)
  if(_remote_client is not None):
    cmd={'device':'client','option':'connect','ip':addr[0],'port':addr[1]}
    data=pc.encode(json.dumps(cmd).encode('utf-8'),b'default')
    _remote_client.send(data)
  while True:
    try:
      recv = tcp_server.recv(4096)
    except Exception as e:
      print("local:",str(e))
      break
    if recv:
      cmd={'device':'client','option':'data','ip':addr[0],'port':addr[1]}
      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 {addr[0]},{addr[1]}")
    else:
      break
  tcp_server.close()
  if(_remote_client is not None):
    cmd={'device':'client','option':'disconnect','ip':addr[0],'port':addr[1]}
    data=pc.encode(json.dumps(cmd).encode('utf-8'),b'default')
    _remote_client.send(data)
  _local_client.remove(addr_info)



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()
  tcp_server = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
  tcp_server.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,True)
  tcp_server.bind(("",_LOCAL_PORT))
  print(f"开始监听({_LOCAL_PORT})")
  tcp_server.listen(128)
  while True:
      temp , temp_address = tcp_server.accept()
      thd = threading.Thread(target = local_client_handler, args = (temp,temp_address))
      thd.start()


if __name__ == "__main__":
  main()