import sys
from time import sleep
from typing import Sequence, Optional

from pyo import Server, Sine, Adsr
from morseman import morse

WPM = 20
STD_WORD_LENGTH = 26 # PARIS, 26 dits
DIT = 60 / WPM / 26 # seconds
DAH = 3 * DIT
CHAR_PAUSE = 3 * DIT
WORD_PAUSE = 7 * DIT


def play_morse(morse: Sequence[Optional[morse.MorseChar]], note_controller):
	for char in morse:
		if char is None:
			print("None encountered in morse to play")
			continue

		if char.dashdots == "/":
			sleep(WORD_PAUSE - CHAR_PAUSE)
			continue

		for ditdah in char.dashdots:
			if ditdah == ".":
				note_controller.dur = DIT
				note_controller.play()
				sleep(DIT + DIT)
			elif ditdah == "-":
				note_controller.dur = DAH
				note_controller.play()
				sleep(DAH + DIT)

		sleep(CHAR_PAUSE - DIT)


def main():
	# Creates a Server object with default arguments.
	# See the manual about how to change the sampling rate, the buffer
	# size, the number of channels or one of the other global settings.
	s = Server()

	# Boots the server. This step initializes audio and midi streams.
	# Audio and midi configurations (if any) must be done before that call.
	s.boot()

	envelope = Adsr(attack=0.01, sustain=1, release=0.01)
	# setExp method can be used to create exponential or logarithmic envelope.
	envelope.setExp(0.75)

	tone = Sine(600, mul=envelope).out()

	# Starts the server. This step activates the server processing loop.
	s.start()

	for line in sys.stdin:
		play_morse(morse.encode(line), envelope)