import asyncnet, asyncdispatch, strutils, threadpool

proc fib(n: int): int   =
  if n < 2:
    result = n
  else:
    result = fib(n-1) + fib(n-2)

proc processClient(client: AsyncSocket) {.async.} =
  while true:
    let line = await client.recvLine()
    #let res = await 
    #await client.send(intToStr(res) & "\n")
    await client.send(intToStr( fib(line.parseInt())  ) & "\n")
    
proc serve() {.async.} =
  var server = newAsyncSocket()
  server.setSockOpt(OptReuseAddr, true)
  server.bindAddr(Port(25000))
  server.listen()
 
  while true:
    let client = await server.accept()
    discard processClient(client)
 
discard serve()
runForever()