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import Tone from 'tone'
import StartAudioContext from './startAudioContext'
const isIphone = (navigator.userAgent.match(/iPhone/i)) || (navigator.userAgent.match(/iPod/i))
const isIpad = (navigator.userAgent.match(/iPad/i))
const isAndroid = (navigator.userAgent.match(/Android/i))
const isMobile = isIphone || isIpad || isAndroid
const isDesktop = ! isMobile
document.body.classList.add(isMobile ? 'mobile' : 'desktop')
const browser = { isIphone, isIpad, isMobile, isDesktop }
function choice (a){ return a[ Math.floor(Math.random() * a.length) ] }
function mod(n,m){ return n-(m * Math.floor(n/m)) }
function norm(n, min, max){ return (n - min) / (max - min) }
function requestAudioContext (fn) {
if (isMobile) {
const container = document.createElement('div')
const button = document.createElement('div')
button.innerHTML = 'Tap to start - please unmute your phone'
Object.assign(container.style, {
position: 'absolute',
width: '100%',
height: '100%',
zIndex: '10000',
top: '0px',
left: '0px',
backgroundColor: 'rgba(0, 0, 0, 0.8)',
})
Object.assign(button.style, {
position: 'absolute',
left: '50%',
top: '50%',
padding: '20px',
backgroundColor: '#7F33ED',
color: 'white',
fontFamily: 'monospace',
borderRadius: '3px',
transform: 'translate3D(-50%,-50%,0)',
textAlign: 'center',
lineHeight: '1.5',
})
container.appendChild(button)
document.body.appendChild(container)
StartAudioContext.setContext(Tone.context)
StartAudioContext.on(button)
StartAudioContext.onStarted(_ => {
container.remove()
fn()
})
} else {
fn()
}
}
function dataURItoBlob(dataURI) {
// convert base64 to raw binary data held in a string
// doesn't handle URLEncoded DataURIs - see SO answer #6850276 for code that does this
var byteString = atob(dataURI.split(',')[1]);
// separate out the mime component
var mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0]
// write the bytes of the string to an ArrayBuffer
var ab = new ArrayBuffer(byteString.length);
// create a view into the buffer
var ia = new Uint8Array(ab);
// set the bytes of the buffer to the correct values
for (var i = 0; i < byteString.length; i++) {
ia[i] = byteString.charCodeAt(i);
}
// write the ArrayBuffer to a blob, and you're done
var blob = new Blob([ab], {type: mimeString});
return blob;
}
function ftom(f) {
// return (Math.log(f) - Math.log(261.626)) / Math.log(2) + 4.0
return 69 + 12 * Math.log2(f / 440)
}
function mtof(m) {
return 440 * Math.pow(2, (m - 69) / 12)
}
function tap (fn) {
return (e) => {
if (browser.isMobile) fn()
else if (e.press) fn()
}
}
/* get minimum and maximum variance from row-to-row */
function get_diff_bounds(rows){
const diffs = rows.map(row => {
const row_min = Math.min.apply(Math, row)
const row_max = Math.max.apply(Math, row)
return row_max - row_min
})
const min = Math.min.apply(Math, diffs)
const max = Math.max.apply(Math, diffs)
return { min, max }
}
/* get minimum and maximum values from a dataset */
function get_bounds(dataset){
let rows = dataset.lines
// rows.forEach(row => row.shift())
rows = rows.map(a => a.map(n => parseFloat(n)))
const max = rows.reduce((a,b) => {
return b.reduce((z,bb) => {
return Math.max(z, bb)
}, a)
}, -Infinity)
const min = rows.reduce((a,b) => {
return b.reduce((z,bb) => {
return Math.min(z, bb)
}, a)
}, Infinity)
return { rows, max, min }
}
export { choice, mod, norm, browser, get_bounds, get_diff_bounds, requestAudioContext, ftom, mtof, tap, dataURItoBlob }
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