import json

import stats


class NetworkReader:
	def __init__(self,stream):
		self._stream=stream

	def readMsg(self):
		data=self._stream.readline()
		assert data
		stats.logReceived(data)
		jsonLength=int(data.split(b":")[1].strip()) # "json-length: length" -> length

		data=self._stream.readline()
		assert data
		stats.logReceived(data)
		binLength=int(data.split(b":")[1].strip()) # "bin-length: length" -> length

		jsonData=self._stream.read(jsonLength)
		assert len(jsonData)==jsonLength
		stats.logReceived(jsonData)
		jsonData=json.loads(str(jsonData,encoding="utf-8"))

		binData=self._stream.read(binLength)
		assert len(binData)==binLength
		stats.logReceived(binData)
		
		return (jsonData,binData)
		

class NetworkWriter:
	def __init__(self,stream):
		self._stream=stream

	def writeMsg(self,*args):
		msg=self.prepMsg(*args)
		self._stream.write(msg)
		self._stream.flush()
		stats.logSent(msg)

	def prepMsg(self,jsonData,binData=b""):
		jsonData=bytes(json.dumps(jsonData)+"\n",encoding="utf-8")
		jsonLength=bytes("json-length: "+str(len(jsonData))+"\n",encoding="utf-8")
		binLength=bytes("bin-length: "+str(len(binData))+"\n",encoding="utf-8")

		return b"".join((jsonLength,binLength,jsonData,binData))