All files / src/components ThemeContext.tsx

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import { createContext, useContext, useEffect, useState, type ReactNode } from 'react';
 
type Theme = 'light' | 'dark';
 
interface ThemeContextType {
  theme: Theme;
  toggleTheme: () => void;
  setTheme: (theme: Theme) => void;
}
 
const ThemeContext = createContext<ThemeContextType | undefined>(undefined);
 
export function ThemeProvider({ children }: { children: ReactNode }) {
  const [theme, setThemeState] = useState<Theme>(() => {
    const stored = localStorage.getItem('theme') as Theme | null;
    if (stored) return stored;
    // Default to dark theme
    return 'dark';
  });
 
  useEffect(() => {
    const root = document.documentElement;
    if (theme === 'dark') {
      root.classList.add('dark');
    } else {
      root.classList.remove('dark');
    }
    localStorage.setItem('theme', theme);
  }, [theme]);
 
  const toggleTheme = () => {
    setThemeState((prev) => (prev === 'dark' ? 'light' : 'dark'));
  };
 
  const setTheme = (newTheme: Theme) => {
    setThemeState(newTheme);
  };
 
  return (
    <ThemeContext.Provider value={{ theme, toggleTheme, setTheme }}>
      {children}
    </ThemeContext.Provider>
  );
}
 
export function useTheme() {
  const context = useContext(ThemeContext);
  if (!context) {
    throw new Error('useTheme must be used within a ThemeProvider');
  }
  return context;
}