Initial commit: Online documentation site with CMS, notes, and message board

src/components/ThemeProvider.tsx

@@ -0,0 +1,62 @@
+"use client";
+
+import { createContext, useContext, useEffect, useState } from "react";
+
+type Theme = "light" | "dark";
+
+interface ThemeContextType {
+  theme: Theme;
+  toggleTheme: () => void;
+}
+
+const ThemeContext = createContext<ThemeContextType | undefined>(undefined);
+
+export function ThemeProvider({ children }: { children: React.ReactNode }) {
+  const [theme, setTheme] = useState<Theme>("light");
+  const [mounted, setMounted] = useState(false);
+
+  useEffect(() => {
+    setMounted(true);
+    const savedTheme = localStorage.getItem("theme") as Theme | null;
+    if (savedTheme) {
+      setTheme(savedTheme);
+      if (savedTheme === "dark") {
+        document.documentElement.classList.add("dark");
+      }
+    } else if (window.matchMedia("(prefers-color-scheme: dark)").matches) {
+      setTheme("dark");
+      document.documentElement.classList.add("dark");
+    }
+  }, []);
+
+  const toggleTheme = () => {
+    setTheme((prev) => {
+      const newTheme = prev === "light" ? "dark" : "light";
+      localStorage.setItem("theme", newTheme);
+      if (newTheme === "dark") {
+        document.documentElement.classList.add("dark");
+      } else {
+        document.documentElement.classList.remove("dark");
+      }
+      return newTheme;
+    });
+  };
+
+  if (!mounted) {
+    return <>{children}</>;
+  }
+
+  return (
+    <ThemeContext.Provider value={{ theme, toggleTheme }}>
+      {children}
+    </ThemeContext.Provider>
+  );
+}
+
+export function useTheme() {
+  const context = useContext(ThemeContext);
+  if (!context) {
+    throw new Error("useTheme must be used within a ThemeProvider");
+  }
+  return context;
+}