PaletteSwitcher/client/src/ThemeToggler.tsx

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import {
faMoon,
faSun,
IconDefinition,
} from "@fortawesome/free-solid-svg-icons";
import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
import { useEffect, useState } from "react";
type Theme = "light" | "dark";
function ThemeToggler() {
const userPrefersDarkMode = (): boolean => {
return (
localStorage.theme === "dark" ||
(!("theme" in localStorage) &&
window.matchMedia("(prefers-color-scheme: dark)").matches)
);
};
const getCurrentTheme = (): Theme => {
// We have a theme set
if ("theme" in localStorage) {
const theme = localStorage.getItem("theme");
// Is it valid ?
if (theme === "dark" || theme === "light") {
return theme;
} else {
// Invalid theme, remove it and return default
localStorage.removeItem("theme");
return userPrefersDarkMode() ? "dark" : "light";
}
} else {
return userPrefersDarkMode() ? "dark" : "light";
}
};
const [theme, setTheme] = useState<Theme>(getCurrentTheme());
const rotateTheme = () => {
switch (theme) {
case "light":
setTheme("dark");
break;
case "dark":
setTheme("light");
break;
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default:
setTheme("light");
break;
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}
};
const getIcon = (): IconDefinition => {
switch (theme) {
case "light":
return faMoon;
case "dark":
return faSun;
}
};
useEffect(() => {
localStorage.theme = theme;
if (theme === "dark") {
document.documentElement.classList.add("dark");
} else if (theme === "light") {
document.documentElement.classList.remove("dark");
}
}, [theme]);
return (
<FontAwesomeIcon
icon={getIcon()}
onClick={rotateTheme}
className="fa-2x hover:text-nord-7 mx-2"
/>
);
}
export default ThemeToggler;