# -*- coding: UTF-8 -*-
'''
rtx - RetroText
rtxModem: Modem-Funktionen
by Anna Christina Naß <acn@acn.wtf>
released under GPL
'''

import glob
import serial
import config
import logging

def init_modem():
	""" send the modem init strings to the modem """
	logging.debug("init_modem")
	if config.MODEM_INIT1 != "":
		logging.debug("sending MODEM_INIT1")
		glob.ser.write(bytes(config.MODEM_INIT1 + "\r", "latin-1"))
		rc = _serial_readline()
		logging.info("MODEM_INIT1: %s", rc)
		rc = _serial_readline()
		logging.info("MODEM_INIT1: %s", rc)

	if config.MODEM_INIT2 != "":
		logging.debug("sending MODEM_INIT2")
		glob.ser.write(bytes(config.MODEM_INIT2 + "\r", "latin-1"))
		rc = _serial_readline()
		logging.info("MODEM_INIT2: %s", rc)
		rc = _serial_readline()
		logging.info("MODEM_INIT2: %s", rc)

def wait_for_caller():
	""" waits for the RING of the modem and answers it """
	modem_answered = False
	logging.debug("wait_for_caller")
	while not modem_answered:
		rc = _serial_readline()
		if rc.startswith(config.MODEM_RING):
			logging.info("modem ringing! Answering.")
			glob.ser.write(bytes(config.MODEM_ANSWER + "\r", "latin-1"))
			rc = _serial_readline()
			logging.info("Answer: %s", rc)
			rc = _serial_readline()
			logging.info("Answer: %s", rc)
			modem_answered=True
		else:
			modem_answered=False

def _serial_readline():
	line = ""
	in_byte = ""
	
	while not in_byte == b"\n":
		in_byte = glob.ser.read(1)
		#print(in_byte)
		line += str(in_byte, encoding="latin-1")

	return line