import { Pattern, noteToMidi, valueToMidi } from '@strudel/core';

const maxPan = noteToMidi('C8');

const panwidth = (pan, width) => pan * width + (1 - width) / 2;

Pattern.prototype.piano = function () {

  return this.clip(1)

    .s('piano')

    .release(0.1)

    .fmap((value) => {

      const midi = valueToMidi(value);

      // pan by pitch

      const pan = panwidth(Math.min(Math.round(midi) / maxPan, 1), 0.5);

      return { ...value, pan: (value.pan || 1) * pan };

    });

};