import javax.sound.sampled.AudioFormat
import javax.sound.sampled.AudioSystem

val morseCode = hashMapOf(
        'a' to ".-", 'b' to "-...", 'c' to "-.-.",
        'd' to "-..", 'e' to ".", 'f' to "..-.",
        'g' to "--.", 'h' to "....", 'i' to "..",
        'j' to ".---", 'k' to "-.-", 'l' to ".-..",
        'm' to "--", 'n' to "-.", 'o' to "---",
        'p' to ".--.", 'q' to "--.-", 'r' to ".-.",
        's' to "...", 't' to "-", 'u' to "..-",
        'v' to "...-", 'w' to ".--", 'x' to "-..-",
        'y' to "-.--", 'z' to "--..",

        '0' to ".....", '1' to "-....", '2' to "--...",
        '3' to "---..", '4' to "----.", '5' to "-----",
        '6' to ".----", '7' to "..---", '8' to "...--",
        '9' to "....-",

        ' ' to "/", ',' to "--..--", '!' to "-.-.--",
        '"' to ".-..-.", '.' to ".-.-.-", '?' to "..--..",
        '\'' to ".----.", '/' to "-..-.", '-' to "-....-",
        '(' to "-.--.-", ')' to "-.--.-"
)

val symbolDurationInMs = hashMapOf('.' to 200, '-' to 500, '/' to 1000)


fun toMorseCode(message: String) = message.filter { morseCode.containsKey(it) }
                                          .fold("") { acc, ch -> acc + morseCode[ch]!! }

fun playMorseCode(morseCode: String) = morseCode.forEach { symbol -> beep(symbolDurationInMs[symbol]!!) }

fun beep(durationInMs: Int) {
    val soundBuffer = ByteArray(durationInMs * 8)
    for ((i, _) in soundBuffer.withIndex()) {
        soundBuffer[i] = (Math.sin(i / 8.0 * 2.0 * Math.PI) * 80.0).toByte()
    }

    val audioFormat = AudioFormat(
            /*sampleRate*/ 8000F,
            /*sampleSizeInBits*/ 8,
            /*channels*/ 1,
            /*signed*/ true,
            /*bigEndian*/ false
    )
    with (AudioSystem.getSourceDataLine(audioFormat)!!) {
        open(audioFormat)

        start()
        write(soundBuffer, 0, soundBuffer.size)
        drain()

        close()
    }
}

fun main(args: Array<String>) {
    args.forEach {
        playMorseCode(toMorseCode(it.toLowerCase()))
    }
}