const css = `
#environment-adviser {
	background-color: #ff0000;
	color: white;
	padding: 10px 20px;
	border-radius: 5px;
	font-family: sans-serif;
	font-weight: bold;
	cursor: pointer;
	z-index: 9999;
}
`

function addStyles() {
	const styleSheet = document.createElement('style')
	styleSheet.type = 'text/css'
	styleSheet.innerText = css
	document.head.appendChild(styleSheet)
}

export function showEnvironmentAdviser(options?: {
	scale?: number
	opacity?: number
	animation?: 'none' | 'slide' | 'spin' | 'pulse'
	transitionSpeed?: number
}) {
	if (process.env.NODE_ENV === 'production') {
		return
	}

	const scale = options?.scale ?? 1
	const opacity = options?.opacity ?? 1
	const animation = options?.animation ?? 'none'
	const speedMultiplier = options?.transitionSpeed ?? 1
	const duration = 1 / speedMultiplier

	const adviser = document.createElement('div')
	adviser.id = 'environment-adviser'
	adviser.textContent = `ENVIRONMENT: ${process.env.NODE_ENV}`

	adviser.style.position = 'fixed'
	adviser.style.backgroundColor = '#ff0000'
	adviser.style.color = 'white'
	adviser.style.padding = `${0.625 * scale}rem ${1.25 * scale}rem`
	adviser.style.borderRadius = `${0.3125 * scale}rem`
	adviser.style.fontFamily = 'sans-serif'
	adviser.style.fontWeight = 'bold'
	adviser.style.fontSize = `${1 * scale}rem`
	adviser.style.cursor = 'pointer'
	adviser.style.zIndex = '9999'
	adviser.style.opacity = opacity.toString()

	const styleSheet = document.createElement('style')
	styleSheet.innerHTML = `
		@keyframes adviser-spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
		.adviser-spin { animation: adviser-spin ${duration}s linear; }
		@keyframes adviser-pulse { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.2); } }
		.adviser-pulse { animation: adviser-pulse ${duration}s ease-in-out; }
	`
	document.head.appendChild(styleSheet)
	document.body.appendChild(adviser)

	const corners = ['top-right', 'bottom-right', 'bottom-left', 'top-left']
	let currentCornerIndex = 0
	let isMoving = false

	const setPosition = (cornerName: string) => {
		const offsetRem = 1.25 * scale
		const { offsetHeight: elHeight, offsetWidth: elWidth } = adviser

		adviser.style.right = ''
		adviser.style.bottom = ''
		adviser.style.top = ''
		adviser.style.left = ''

		switch (cornerName) {
			case 'top-right':
				adviser.style.top = `${offsetRem}rem`
				adviser.style.left = `calc(100vw - ${elWidth}px - ${offsetRem}rem)`
				break
			case 'bottom-right':
				adviser.style.top = `calc(100vh - ${elHeight}px - ${offsetRem}rem)`
				adviser.style.left = `calc(100vw - ${elWidth}px - ${offsetRem}rem)`
				break
			case 'bottom-left':
				adviser.style.top = `calc(100vh - ${elHeight}px - ${offsetRem}rem)`
				adviser.style.left = `${offsetRem}rem`
				break
			case 'top-left':
				adviser.style.top = `${offsetRem}rem`
				adviser.style.left = `${offsetRem}rem`
				break
		}
	}

	const moveAdviser = () => {
		if (isMoving) return
		isMoving = true

		currentCornerIndex = (currentCornerIndex + 1) % corners.length
		const nextCorner = corners[currentCornerIndex]

		if (animation === 'slide') {
			adviser.style.transition = `top ${duration}s linear, left ${duration}s linear`
		} else {
			adviser.style.transition = `all ${duration}s ease-in-out`
		}

		if (animation === 'spin' || animation === 'pulse') {
			adviser.classList.add(`adviser-${animation}`)
		}

		setPosition(nextCorner)

		setTimeout(() => {
			isMoving = false
			if (animation === 'spin' || animation === 'pulse') {
				adviser.classList.remove(`adviser-${animation}`)
			}
		}, duration * 1000)
	}

	setTimeout(() => {
		adviser.style.transition = 'none'
		setPosition(corners[currentCornerIndex])
	}, 50)

	window.addEventListener('resize', () => {
		adviser.style.transition = 'none'
		setPosition(corners[currentCornerIndex])
	})

	adviser.addEventListener('mouseenter', moveAdviser)
	adviser.addEventListener('click', moveAdviser)
}