// Für Elise | Piano Contest. Created by Reinder Nijhoff 2023
// https://dittytoy.net/ditty/cb751b4b3b
//
// It would be fun to start an ongoing, informal piano competition. You can fork this ditty and write 
// your loops, synths, and filters to play the Für Elise with the best-sounding piano sound possible.
//
// I want to participate in this competition, but I need to learn more about sound synthesis. 
// Therefore, it will be appreciated if you all share tips and links to resources about sound synthesis
// in the comments of this ditty so we can all learn from it..
//

ditty.bpm = 60;

const numWorkers = 1; // increase number of workers when performance is low
const fürEliseData = fürElise();

//
// Write your loops, synths, and filters to play the Fur Elise with the best-sounding piano sound possible.
//
const piano = synth.def(class {
   constructor(options) {
            this.phase = 0;
            this.freq = midi_to_hz(options.note);
        }
        process(note, env, tick, options) {
            this.phase += this.freq * ditty.dt;
            return Math.sin(this.phase * Math.PI * 2) * env.value;
        }
}, {    
    levels: [0,1,0.1,0], 
    times:  [0.005,0.5,0.15], 
    curves: [0, -2, -2],
    env:    segenv,
});

for (let i=0; i<numWorkers; i++) {
    loop( () => {
        fürEliseData.notes.forEach( (n, index) => {
            sleep(second_to_tick(n.dt));
            
            if (index % numWorkers === i % numWorkers) {
                
                const duration = n.sustain ? Math.max(n.duration, Math.min(n.duration + 0.5, n.sustainMaxDuration)) : n.duration;
                piano.play(n.midi, { 
                    amp: n.velocity, 
                    duration: second_to_tick(duration), 
                    pan: (n.midi-50)/50 - .5
                });
                
            }
        });
    
    }, { name: `Piano ${i}`, sync: fürEliseData.duration, amp: 0.75 });
}

//
// Use this data. The data contains each note's velocity, duration, and time and whether the sustain pedal is active.
// The data is based on a midi file by: https://www.patreon.com/rousseau
// You can find the recording of the midi file here: https://youtu.be/wfF0zHeU3Zs 
//

function fürElise() {
    const data = 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