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import { createContext, useContext, useEffect, useState } from "react";
type Theme = "dark" | "light" | "system";
// Define the state type for the ThemeProvider
export type ThemeProviderState = {
theme: Theme;
setTheme: (theme: Theme) => void;
};
// Define the initial state for the ThemeProvider
const initialState: ThemeProviderState = {
theme: "system",
setTheme: () => null,
};
// Creates a 'bucket' that holds data that any componen can access without props if inside the provider
export const ThemeProviderContext =
createContext<ThemeProviderState>(initialState);
// Define the props type for the ThemeProvider
type ThemeProviderProps = {
children: React.ReactNode;
defaultTheme?: Theme;
};
export const ThemeProvider: React.FC<ThemeProviderProps> = ({
children,
defaultTheme = "system",
}) => {
// Load theme from localStorage if available, otherwise use defaultTheme
const [theme, setTheme] = useState<Theme>(() => {
const storedTheme = localStorage.getItem("theme");
if (
storedTheme === "dark" ||
storedTheme === "light" ||
storedTheme === "system"
) {
return storedTheme;
}
return defaultTheme;
});
// Effect to update the theme when it changes
useEffect(() => {
// Get the root element, which is the entire html document
const root = window.document.documentElement;
// Remove all existing theme classes on the root element
root.classList.remove("light", "dark");
if (theme === "system") {
const systemTheme = window.matchMedia("(prefers-color-scheme: dark)")
.matches
? "dark"
: "light";
root.classList.add(systemTheme);
return;
}
root.classList.add(theme);
}, [theme]);
const value = {
theme,
setTheme: (theme: Theme) => {
setTheme(theme);
localStorage.setItem("theme", theme);
},
};
return (
<ThemeProviderContext.Provider value={value}>
{children}
</ThemeProviderContext.Provider>
);
};
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