// audio for events
// AUDIO SETUP
let audioEngine = new(window.AudioContext || window.webkitAudioContext)()
let masterGain = audioEngine.createGain()

let voice = {
  gain: audioEngine.createGain(),
  osc: audioEngine.createOscillator(),
  adsr: {
    a: typeof amount === 'number' ? amount * 1000 : 0.025,
    d: typeof amount === 'number' ? amount * 1000 : 0.5,
    sv: typeof amount === 'number' ? amount : 0.8,
    r: typeof amount === 'number' ? amount * 1000 : 0.5,
    t: audioEngine.currentTime
  },
  play: function(note) {
    freq = typeof note === 'number' ? note : (Math.random() * 350) + 50
    this.osc.frequency.setValueAtTime(freq, audioEngine.currentTime)
    this.engage()
  },
  engage: function() {

    // clear preScheduled events
    this.gain.gain.cancelScheduledValues(this.adsr.t)
    // initial value
    this.gain.gain.setValueAtTime(0.0, this.adsr.t)
    // attack
    this.gain.gain.setTargetAtTime(0.9, this.adsr.t, this.adsr.a)
    // decay
    this.gain.gain.setTargetAtTime(this.adsr.sv, this.adsr.t + this.adsr.a, this.adsr.d)
  },
  release: function() {
    this.adsr.t = audioEngine.currentTime
    // release
    this.gain.gain.setTargetAtTime(0.0, this.adsr.t, this.adsr.r)
  }
}

window.onload = function() {
  // create gain
  voice.gain.gain.setValueAtTime(0.0001, audioEngine.currentTime)
  masterGain.gain.value = 0.9
  voice.gain.connect(masterGain)

  // create oscilator
  voice.osc.type = 'sine'
  voice.osc.connect(voice.gain)
  voice.osc.start()

  masterGain.connect(audioEngine.destination)
}


// AMBIENT



// BUTTON HOVER