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const angleInput = document.querySelector('[data-input="range"]')

const thicknessInput = document.querySelector('[data-input="thickness"]')

const widthInput = document.querySelector('[data-input="width"]')

const colorInput = document.querySelector('[data-input="color1"]')

const contrastInput = document.querySelector('[data-input="contrast"]')

const outputContainer = document.querySelector('[data-output]')

const bg = document.querySelector('[data-bg]')

const inputs = [...document.querySelectorAll('[data-input]')]

const angleChange = (target) => {

const newAngle = `${target.value}deg`

setItem('--angle', newAngle, 'angle', target.value)

}

const thicknessChange = (target) => {

const newThickness = `${target.value}px`

setItem('--t', newThickness, 'thickness', target.value)

}

const setItem = (cssVar, newValue, property, unitlessValue) => {

bg.style.setProperty(cssVar, newValue)

getCSSOutput()

localStorage.setItem(property, unitlessValue)

}

const widthChange = (target) => {

const newWidth = `${target.value}px`

setItem('--w', newWidth, 'width', target.value)

}

const colorChange = (target) => {

const newColor = `${target.value}deg`

setItem('--h1', newColor, 'color', target.value)

}

const setContrast = (contrast) => {

const newL = `${contrast}%`

const newD = `${100 - contrast}%`

bg.style.setProperty('--l', newL)

bg.style.setProperty('--d', newD)

}

const contrastChange = (target) => {

setContrast(target.value)

getCSSOutput()

localStorage.setItem('contrast', target.value)

}

const getCSSOutput = () => {

const backgroundImage = getComputedStyle(bg, '::after').backgroundImage

const backgroundSize = getComputedStyle(bg, '::after').backgroundSize

const width = getComputedStyle(bg, '::after').width

const mask = getComputedStyle(bg, '::after').webkitMaskSize

const cssOutput = `

<pre>

.bg {

position:relative;

overflow:hidden;

}

.bg::before,

.bg::after {

content: '';

position: absolute;

inset:0;

width:${width};

background-image: ${backgroundImage};

background-size: ${backgroundSize};

}

.bg::after {

transform:scaleX(-1);

-webkit-mask: linear-gradient(90deg,#000 50%, #0000 0) 0/${mask};

mask: linear-gradient(90deg,#000 50%, #0000 0) 0/${mask};

}

</pre>`

outputContainer.innerHTML = cssOutput

}

const setStyle = (input, property, unitlessValue, value) => {

if (unitlessValue) {

input.value = unitlessValue

bg.style.setProperty(property, value)

}

}

const getInitialStateFromLocalStorage = () => {

const angle = localStorage.getItem('angle')

const thickness = localStorage.getItem('thickness')

const width = localStorage.getItem('width')

const color = localStorage.getItem('color')

const contrast = localStorage.getItem('contrast')

setStyle(angleInput, '--angle', angle, `${angle}deg`)

setStyle(thicknessInput, '--t', thickness, `${thickness}px`)

setStyle(widthInput, '--w', width, `${width}px`)

setStyle(colorInput, '--h1', color, `${color}deg`)

if (contrast) {

setContrast(contrast)

contrastInput.value = contrast

}

}

getInitialStateFromLocalStorage()

getCSSOutput()

let activeInput

const handleMouseDown = (e) => {

activeInput = e.target

}

const updateValues = (target) => {

const { id } = target

if (id === 'angle') {

angleChange(target)

}

if (id === 'thickness') {

thicknessChange(target)

}

if (id === 'color1') {

colorChange(target)

}

if (id === 'width') {

widthChange(target)

}

if (id === 'contrast') {

contrastChange(target)

}

}

const handleMouseMove = (e) => {

if (activeInput === e.target) {

updateValues(e.target)

}

}

const handleChange = (e) => {

updateValues(e.target)

}

inputs.forEach(el => {

el.addEventListener('change', handleChange)

el.addEventListener('mousedown', handleMouseDown)

el.addEventListener('mousemove', _.throttle(handleMouseMove, 100))

updateValues(el)

})

CSS.registerProperty({

name: '--angle',

syntax: '<angle>',

inherits: true,

initialValue: `${angleInput.value}deg`,

})

CSS.registerProperty({

name: '--t',

syntax: '<length>',

inherits: true,

initialValue: `${thicknessInput.value}px`,

})

CSS.registerProperty({

name: '--w',

syntax: '<length>',

inherits: true,

initialValue: `${widthInput.value}px`,

})