Update package layout

lib/provider/theme/ThemeProvider.tsx

@@ -0,0 +1,62 @@
+import type { Theme, ThemeProviderProps, ThemeProviderState } from "$/types/ThemeTypes";
+import { createContext, useContext, useEffect, useMemo, useState } from "react";
+
+
+const themeInitialState: ThemeProviderState = {
+	theme: "system",
+	setTheme: () => null
+}
+
+const ThemeProviderContext = createContext<ThemeProviderState>(themeInitialState);
+
+
+export default function ThemeProvider(props: Readonly<ThemeProviderProps>){
+	const {
+		children,
+		defaultTheme = "system",
+		storageKey = "mattrixwv-ui-theme"
+	} = props;
+
+	const [ theme, setTheme ] = useState<Theme>((localStorage.getItem(storageKey) as Theme) || defaultTheme);
+
+	useEffect(() => {
+		const root = globalThis.document.documentElement;
+
+		root.classList.remove("light", "dark");
+
+		if(theme === "system"){
+			const systemTheme = globalThis.matchMedia("(prefers-color-scheme: light)").matches ? "light" : "dark";
+
+			root.classList.add(systemTheme);
+		}
+		else{
+			root.classList.add(theme);
+		}
+	}, [ theme ]);
+
+	const value: ThemeProviderState = useMemo(() => ({
+		theme,
+		setTheme: (theme: Theme) => {
+			localStorage.setItem(storageKey, theme);
+			setTheme(theme);
+		}
+	}), [storageKey, theme]);
+
+	return (
+		<ThemeProviderContext.Provider value={value}>
+			{children}
+		</ThemeProviderContext.Provider>
+	);
+}
+
+
+// eslint-disable-next-line react-refresh/only-export-components
+export function useTheme(){
+	const context = useContext(ThemeProviderContext);
+
+	if(!context){
+		throw new Error("useTheme must be used within a ThemeProvider");
+	}
+
+	return context;
+}