const body = document.body
const queryAll = sel => document.querySelectorAll(sel)

const initTheme = () => {
	const curTheme = localStorage.getItem('theme')
	const oldTheme = curTheme	== 'dark' ? 'light' : 'dark'
	body.classList.add(`${curTheme}-theme`)
	body.classList.remove(`${oldTheme}-theme`)
}

if (localStorage.getItem('theme') === null) {
	localStorage.setItem('theme', window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light')
}

initTheme()

const toggleTheme = ev => {
	localStorage.setItem('theme', localStorage.getItem('theme') == 'dark' ? 'light' : 'dark')
	initTheme()
	if (!!ev.target) ev.preventDefault()
	return false
}

queryAll('.theme-toggler').forEach(a => a.addEventListener('click', toggleTheme))
queryAll('.js-only').forEach(a => a.classList.remove('js-only'))
queryAll('.js-disabled-only').forEach(a => a.remove())

const initAlign = () => {
	const cur = localStorage.getItem('align')
	const prev = cur == 'center' ? 'left' : 'center'
	body.classList.add('align-' + cur)
	body.classList.remove('align-' + prev)
}

if (localStorage.getItem('align') === null) localStorage.setItem('align', 'center')

initAlign()

const toggleAlign = ev => {
	localStorage.setItem('align', localStorage.getItem('align') == 'center' ? 'left' : 'center')
	initAlign()
	if (!!ev.target) ev.preventDefault()
	return false
}

queryAll('.align-toggler').forEach(a => a.addEventListener('click', toggleAlign))

window.addEventListener('load', _ev => {
	console.log('loaded')
	const selector = [1, 2, 3, 4, 5, 6].map(n => `h${n}[id]`).join(',')
	console.log(selector)
	queryAll(selector).forEach(el => {
		console.log(el)
		const anchorLink = document.createElement('a')
		anchorLink.classList.add('anchor-link')
		anchorLink.textContent = '§'
		anchorLink.href = `#${el.id}`
		el.appendChild(anchorLink)
	})
})