fix-visual-stability/environment/app/src/components/ThemeProvider.tsx

'use client';

import { createContext, useContext, useState, useEffect, ReactNode } from 'react';

type Theme = 'light' | 'dark';

const ThemeContext = createContext<{
  theme: Theme;
  toggleTheme: () => void;
}>({ theme: 'light', toggleTheme: () => {} });

export function useTheme() {
  return useContext(ThemeContext);
}

export function ThemeProvider({ children }: { children: ReactNode }) {
  const [theme, setTheme] = useState<Theme>('light');

  useEffect(() => {
    const savedTheme = localStorage.getItem('theme') as Theme;
    if (savedTheme) {
      setTheme(savedTheme);
    }
  }, []);

  useEffect(() => {
    document.documentElement.setAttribute('data-theme', theme);
  }, [theme]);

  const toggleTheme = () => {
    const newTheme = theme === 'light' ? 'dark' : 'light';
    setTheme(newTheme);
    localStorage.setItem('theme', newTheme);
  };

  return (
    <ThemeContext.Provider value={{ theme, toggleTheme }}>
      <div data-testid="theme-wrapper" id="theme-wrapper" className={`min-h-screen ${theme === 'dark' ? 'bg-[#1a1a1a] text-white' : 'bg-white text-black'}`}>
        {children}
      </div>
    </ThemeContext.Provider>
  );
}