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function createResetTimer(cleanup: () => void, timeout = 1) {
let tag = 0
return () => {
clearTimeout(tag)
tag = setTimeout(() => {
cleanup()
}, timeout * 1000)
}
}
function createToast(duration: number = 1): (text: string) => void {
const toast = document.createElement("div")
toast.className = "toast"
const reset = createResetTimer(() => {
toast.remove()
}, duration)
return (text) => {
if (!toast.isConnected) {
document.body.appendChild(toast)
}
toast.textContent = text
reset()
}
}
const setToast = createToast()
const key = "force-color-scheme"
const dark = "dark"
const light = "light"
type Scheme = typeof dark | typeof light
const mediaQuery = window.matchMedia("(prefers-color-scheme: dark)")
function fromMediaQuery(value: boolean | null): Scheme {
if (value == null) { value = mediaQuery.matches}
return value ? dark : light
}
function opposite(scheme: Scheme): Scheme {
return scheme === dark ? light : dark
}
function updateScheme(theme: Scheme | null): Scheme {
if (theme == null) { theme = fromMediaQuery(null) }
document.querySelector("html")!.dataset["theme"] = theme
return theme
}
mediaQuery.addEventListener("change", (e) => updateScheme(current || fromMediaQuery(e.matches)))
let current: Scheme | null = null
{
const saved = localStorage.getItem(key)
if ([null, dark, light].includes(saved)) {
current = saved as never
} else {
console.log(`invalid saved theme: ${saved}`)
localStorage.removeItem(key)
}
}
updateScheme(current)
function saveScheme(value: Scheme | null) {
current = value
if (value == null) {
localStorage.removeItem(key)
} else {
localStorage.setItem(key, value)
}
const real = updateScheme(value)
setToast(`theme: ${current == null ? "system" : "force"}(${real})`)
}
function next(): Scheme | null {
const sys = fromMediaQuery(null)
if (current == null) {
return opposite(sys)
} else {
if (current === sys) {
return null;
} else {
return opposite(current)
}
}
}
window.addEventListener("load", () => {
const slogon = document.getElementById("slogan")!
let clicks: number = 0
const reset = createResetTimer(() => {
clicks = 0
})
slogon.addEventListener("click", () => {
reset()
clicks += 1
if (clicks === 3) {
saveScheme(next())
clicks = 0
}
})
})
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