#!/usr/bin/env python3

import sys
import subprocess
from threading import Thread

## Console

class Console(object):

    @staticmethod
    def init():
        try:
            import termios
            Console.is_unix = True
            # Disable buffering
            Console.fd = sys.stdin.fileno()
            Console.oldattr = termios.tcgetattr(Console.fd)
            newattr = termios.tcgetattr(Console.fd)
            newattr[3] = newattr[3] & ~termios.ICANON & ~termios.ECHO
            termios.tcsetattr(Console.fd, termios.TCSANOW, newattr)
            # Get getch
            Console.getch = lambda : sys.stdin.read(1)
        except ImportError:
            Console.is_unix = False
            # Get getch
            import msvcrt
            if sys.version_info.major == 2:
                Console.getch = msvcrt.getch
            else:
                Console.getch = lambda : msvcrt.getch().decode('utf-8')

    @staticmethod
    def reset():
        if Console.is_unix:
            import termios
            termios.tcsetattr(Console.fd, termios.TCSANOW, Console.oldattr)

KEY_TIME = 0.3

KEY_TO_FREQ1 = {
    "a": 261.63,
    "w": 277.18,
    "s": 293.66,
    "e": 311.13,
    "d": 329.63,
    "f": 349.23,
    "t": 369.99,
    "g": 392.00,
    "y": 415.30,
    "h": 440.00,
    "u": 466.16,
    "j": 493.88,
    "k": 523.25,
    "o": 554.37,
    "l": 587.33,
    "p": 622.25,
    ";": 659.25,
    ":": 659.25,
    "'": 698.46,
    '"': 698.46,
    "]": 739.99,
    "}": 739.99,
}

KEY_TO_FREQ = FREQ_TO_FREQ1

def play_sound(freq, time):
    proc = subprocess.Popen(['speaker-test', '--frequency', str(freq), '--test', 'sine'],
                            stdout=subprocess.DEVNULL)
    try:
        proc.wait(timeout=time)
    except subprocess.TimeoutExpired:
        proc.kill()

class PlaySoundThread(Thread):
    def __init__(self, freq, time):
        Thread.__init__(self, daemon=True)
        self.freq = freq
        self.time = time

    def run(self):
        play_sound(self.freq, self.time)

def play_char(ch):
    ch = ch.lower()
    if ch in KEY_TO_FREQ:
        PlaySoundThread(KEY_TO_FREQ[ch], KEY_TIME).start()

def print_char(ch):
    if ch == '\x7f':
        ch = '\b \b'
    elif ch == '\x04':
        raise EOFError
    print(ch, end='', flush=True)

def main():
    Console.init()
    try:
        while(True):
            ch = Console.getch()
            print_char(ch)
            play_char(ch)
    except (KeyboardInterrupt, EOFError):
        print()
    finally:
        Console.reset()

if __name__ == '__main__':
    main()