import { Pattern, noteToMidi, valueToMidi } from '@strudel.cycles/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 };
    });
};