Initial open-source release

src/contexts/ThemeContext.tsx

@@ -0,0 +1,57 @@
+import { createContext, useContext, useEffect, useState } from "react";
+
+type Theme = "system" | "light" | "dark";
+
+interface ThemeContextType {
+  theme: Theme;
+  setTheme: (theme: Theme) => void;
+}
+
+const ThemeContext = createContext<ThemeContextType | undefined>(undefined);
+
+export function ThemeProvider({ children }: { children: React.ReactNode }) {
+  const [theme, setTheme] = useState<Theme>(() => {
+    // Try to get the saved theme from localStorage
+    const savedTheme = localStorage.getItem("theme") as Theme;
+    return savedTheme || "system";
+  });
+
+  useEffect(() => {
+    // Save theme preference to localStorage
+    localStorage.setItem("theme", theme);
+
+    // Handle system theme changes
+    const mediaQuery = window.matchMedia("(prefers-color-scheme: dark)");
+
+    const applyTheme = () => {
+      const root = window.document.documentElement;
+      const isDark =
+        theme === "dark" || (theme === "system" && mediaQuery.matches);
+
+      root.classList.remove("light", "dark");
+      root.classList.add(isDark ? "dark" : "light");
+    };
+
+    applyTheme();
+
+    // Listen for system theme changes
+    const listener = () => applyTheme();
+    mediaQuery.addEventListener("change", listener);
+
+    return () => mediaQuery.removeEventListener("change", listener);
+  }, [theme]);
+
+  return (
+    <ThemeContext.Provider value={{ theme, setTheme }}>
+      {children}
+    </ThemeContext.Provider>
+  );
+}
+
+export function useTheme() {
+  const context = useContext(ThemeContext);
+  if (context === undefined) {
+    throw new Error("useTheme must be used within a ThemeProvider");
+  }
+  return context;
+}