import javax.sound.midi.*;

/**
 * @author [av1m](https://www.github.com/av1m)
 * @author [Ilan Nizard](https://fr.linkedin.com/in/ilan-nizard-74a222140)
 * <p>
 * Thanks to [@wadael](https://github.com/wadael) for the initiation
 * </p>
 */
public class Fibo {

    /**
     * Calculate the fibonacci sequence
     *
     * @param n
     * @return long
     */
    private static long fibonacci(final long n) {
        return (1L >= n) ? n : Fibo.fibonacci(n - 1L) + Fibo.fibonacci(n - 2L);
    }

    /**
     * Function that calls playMidiSong according to a note
     *
     * @param note
     */
    public static int getTone(int note) {
        switch (note) {
            case 0:
            case 7:
                return 63; // Mi bemol
            case 1:
            case 8:
                return 64; // Mi
            case 3:
                return 68; // Sol #
            case 4:
                return 57; // La
            case 5:
                return 59; // Si
            case 6:
                return 73; // Do #
            case 9:
                return 0;
            default:
                return 66; // Fa #
        }
    }

    /**
     * main
     *
     * @param args nothing expected
     */
    public static void main(String[] args) throws MidiUnavailableException, InterruptedException {
        final int NUMBER_ITERATION = 40;
        final Synthesizer midiSynth = MidiSystem.getSynthesizer();
        long fiboNumber = 0;
        midiSynth.open();
        // Get and load default instrument and schannel lists
        final Instrument[] instr = midiSynth.getDefaultSoundbank().getInstruments();
        final MidiChannel[] mChannels = midiSynth.getChannels();
        midiSynth.loadInstrument(instr[0]); // Load an instrument
        for (long i = 1; i <= NUMBER_ITERATION; i++) {
            fiboNumber = Fibo.fibonacci(i);
            System.out.println("== Fibo number : " + fiboNumber);
            String notes = String.valueOf(fiboNumber);
            for (int j = 0; j < notes.length(); j++) {
                // Get size of string (long fibo) && transform each char to int
                int oneSong = Character.getNumericValue(notes.charAt(j));
                System.out.println("song Played : " + oneSong);
                mChannels[0].noteOn(Fibo.getTone(oneSong), 100);
                Thread.sleep(250L); // wait time in milliseconds to control duration
                mChannels[0].noteOff((int) i); // Turn off the note
            }
        }
        midiSynth.close();
    }
}