"""MAPID utility library.

This module contains an utility class to control MAPID/CP using pyserial.
"""

import os
import time
import dotenv  # 
import serial


DOTENV_LOADED = False
"""bool: Is .env loaded?

Prevents loading .env multiple times for speed.
"""


def load_dotenv():
	"""Load .env file
	"""
	basedir = os.path.abspath(os.path.dirname(__file__))
	dotenv.load_dotenv(os.path.join(basedir, ".env"))
	global DOTENV_LOADED
	DOTENV_LOADED = True


def get_serial_dev():
	"""Get SERIAL_DEV setting from dotenv.

	Returns:
		str: The device file.

	"""
	global DOTENV_LOADED
	if not DOTENV_LOADED:
		load_dotenv()
	return os.environ.get("SERIAL_DEV")


def get_serial_speed():
	"""Get SERIAL_SPEED setting from dotenv.
	
	Returns:
		int: Serial speed in baud.

	"""
	global DOTENV_LOADED
	if not DOTENV_LOADED:
		load_dotenv()
	return os.environ.get("SERIAL_SPEED")


class MAPIDCP:
	arduino = None
	
	def __init__(self):
		self.arduino = serial.Serial(port=get_serial_dev(), baudrate=get_serial_speed(), timeout=.1)

	def _cmd(self, cmd: str):
		self.arduino.write(bytes(cmd + "\r\n", "utf8"))
		time.sleep(0.1)

	def cls(self):
		self._cmd("CLS")
		
	def led(self, state: bool):
		if state:
			self._cmd("ON")
		else:
			self._cmd("OFF")

	def line(self, line_no: int):
		self._cmd("LINE " + str(line_no))

	def echo(self, text: str):
		self._cmd("ECHO " + text)