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'use strict'
/* global Blob */
function Clock (client) {
const workerScript = 'onmessage = (e) => { setInterval(() => { postMessage(true) }, e.data)}'
const worker = window.URL.createObjectURL(new Blob([workerScript], { type: 'text/javascript' }))
this.isPaused = true
this.timer = null
this.isPuppet = false
this.speed = { value: 120, target: 120 }
this.start = function () {
const memory = parseInt(window.localStorage.getItem('bpm'))
const target = memory >= 60 ? memory : 120
this.setSpeed(target, target, true)
this.play()
}
this.touch = function () {
this.stop()
client.run()
}
this.run = function () {
if (this.speed.target === this.speed.value) { return }
this.setSpeed(this.speed.value + (this.speed.value < this.speed.target ? 1 : -1), null, true)
}
this.setSpeed = (value, target = null, setTimer = false) => {
if (this.speed.value === value && this.speed.target === target && this.timer) { return }
if (value) { this.speed.value = clamp(value, 60, 300) }
if (target) { this.speed.target = clamp(target, 60, 300) }
if (setTimer === true) { this.setTimer(this.speed.value) }
}
this.modSpeed = function (mod = 0, animate = false) {
if (animate === true) {
this.setSpeed(null, this.speed.target + mod)
} else {
this.setSpeed(this.speed.value + mod, this.speed.value + mod, true)
client.update()
}
}
// Controls
this.togglePlay = function (msg = false) {
if (this.isPaused === true) {
this.play(msg)
} else {
this.stop(msg)
}
client.update()
}
this.play = function (msg = false, midiStart = false) {
console.log('Clock', 'Play', msg, midiStart)
if (this.isPaused === false && !midiStart) { return }
this.isPaused = false
if (this.isPuppet === true) {
console.warn('Clock', 'External Midi control')
if (!pulse.frame || midiStart) { // no frames counted while paused (starting from no clock, unlikely) or triggered by MIDI clock START
this.setFrame(0) // make sure frame aligns with pulse count for an accurate beat
pulse.frame = 0
pulse.count = 5 // by MIDI standard next pulse is the beat
}
} else {
if (msg === true) { client.io.midi.sendClockStart() }
this.setSpeed(this.speed.target, this.speed.target, true)
}
}
this.stop = function (msg = false) {
console.log('Clock', 'Stop')
if (this.isPaused === true) { return }
this.isPaused = true
if (this.isPuppet === true) {
console.warn('Clock', 'External Midi control')
} else {
if (msg === true || client.io.midi.isClock) { client.io.midi.sendClockStop() }
this.clearTimer()
}
client.io.midi.allNotesOff()
client.io.midi.silence()
}
// External Clock
const pulse = {
count: 0,
last: null,
timer: null,
frame: 0 // paused frame counter
}
this.tap = function () {
pulse.count = (pulse.count + 1) % 6
pulse.last = performance.now()
if (!this.isPuppet) {
console.log('Clock', 'Puppeteering starts..')
this.isPuppet = true
this.clearTimer()
pulse.timer = setInterval(() => {
if (performance.now() - pulse.last < 2000) { return }
this.untap()
}, 2000)
} else {
if (pulse.count == 0) {
if (this.isPaused) { pulse.frame++ }
else {
if (pulse.frame > 0) {
this.setFrame(client.orca.f + pulse.frame)
pulse.frame = 0
}
client.run()
}
}
}
}
this.untap = function () {
console.log('Clock', 'Puppeteering stops..')
clearInterval(pulse.timer)
this.isPuppet = false
pulse.frame = 0
pulse.last = null
if (!this.isPaused) {
this.setTimer(this.speed.value)
}
}
// Timer
this.setTimer = function (bpm) {
if (bpm < 60) { console.warn('Clock', 'Error ' + bpm); return }
this.clearTimer()
window.localStorage.setItem('bpm', bpm)
this.timer = new Worker(worker)
this.timer.postMessage((60000 / parseInt(bpm)) / 4)
this.timer.onmessage = (event) => {
client.io.midi.sendClock()
client.run()
}
}
this.clearTimer = function () {
if (this.timer) {
this.timer.terminate()
}
this.timer = null
}
this.setFrame = function (f) {
if (isNaN(f)) { return }
client.orca.f = clamp(f, 0, 9999999)
}
// UI
this.toString = function () {
const diff = this.speed.target - this.speed.value
const _offset = Math.abs(diff) > 5 ? (diff > 0 ? `+${diff}` : diff) : ''
const _message = this.isPuppet === true ? 'midi' : `${this.speed.value}${_offset}`
const _beat = diff === 0 && client.orca.f % 4 === 0 ? '*' : ''
return `${_message}${_beat}`
}
function clamp (v, min, max) { return v < min ? min : v > max ? max : v }
}
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