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const key = "color-scheme"
type scheme = "dark" | "light" | null
function createResetTimer(cleanup: () => void, timeout = 1) {
let tag = 0
return () => {
clearTimeout(tag)
tag = setTimeout(() => {
cleanup()
}, timeout * 1000)
}
}
let current = localStorage.getItem(key) as scheme
let inited = false
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 themeToast = createToast()
function setTheme(value: scheme) {
let message = ""
current = value
if (value == null) {
const prefersDarkScheme = window.matchMedia("(prefers-color-scheme: dark)").matches
value = prefersDarkScheme ? "dark" : "light"
message = `theme: system(${value})`
localStorage.removeItem(key)
} else {
message = `theme: force(${value})`
localStorage.setItem(key, value)
}
document.body.dataset["theme"] = value
if (inited) {
themeToast(message)
}
}
setTheme(current)
inited = true
function next(scheme: scheme): scheme {
switch (scheme) {
case "dark":
return "light"
case "light":
return null
default:
return "dark"
}
}
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) {
setTheme(next(current))
clicks = 0
}
})
})
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