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'use strict'
function Clock (terminal) {
this.isPaused = true
this.timer = null
this.speed = { value: 120, target: 120 }
this.start = function () {
this.setTimer(120)
this.play()
}
this.update = function () {
// Animate
if (this.speed.target !== this.speed.value) {
this.set(this.speed.value + (this.speed.value < this.speed.target ? 1 : -1), null, true)
}
}
this.set = function (value, target = null, setTimer = false) {
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.mod = function (mod = 0, animate = false) {
if (animate === true) {
this.set(null, this.speed.target + mod)
} else {
this.set(this.speed.value + mod, this.speed.value + mod, true)
terminal.update()
}
}
// Controls
this.togglePlay = function () {
if (this.isPaused === true) {
this.play()
} else {
this.stop()
}
}
this.play = function () {
if (!this.isPaused) { console.warn('Already playing'); return }
console.log('Clock', 'Play')
this.isPaused = false
this.set(this.speed.target, this.speed.target, true)
}
this.stop = function () {
if (this.isPaused) { console.warn('Already stopped'); return }
console.log('Clock', 'Stop')
terminal.io.midi.silence()
this.isPaused = true
this.clearTimer()
}
// Midi Tap
this.intervals = []
this.lastTap = 0
this.tap = function () {
if (this.intervals.length > 8) {
this.intervals.shift()
}
if (this.intervals.length === 8) {
const sum = this.intervals.reduce((sum, interval) => { return sum + interval })
const bpm = parseInt((1000 / sum) * 60)
if (Math.abs(bpm - this.speed.target) > 1) {
this.set(null, bpm)
}
}
const now = performance.now()
this.intervals.push(now - this.lastTap)
this.lastTap = now
}
// Timer
this.clearTimer = function () {
if (this.timer) {
clearInterval(this.timer)
}
}
this.setTimer = function (bpm) {
this.clearTimer()
this.timer = setInterval(() => { terminal.run(); this.update() }, (60000 / bpm) / 4)
}
this.resetFrame = function () {
terminal.orca.f = 0
}
this.setFrame = function (f) {
if (isNaN(f)) { return }
terminal.orca.f = clamp(f, 0, 9999999)
}
// UI
this.toString = function () {
const diff = this.speed.target - this.speed.value
const _offset = diff > 0 ? `+${diff}` : diff < 0 ? diff : ''
const _beat = diff === 0 && terminal.orca.f % 4 === 0 ? '*' : ''
return `${this.speed.value}${_offset}${_beat}`
}
function clamp (v, min, max) { return v < min ? min : v > max ? max : v }
}
module.exports = Clock
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