import { useState, useEffect } from 'react';

function useLocalStorage(key, initialValue) {
  // State to store our value
  // Pass initial state function to useState so logic is only executed once
  const [storedValue, setStoredValue] = useState(() => {
    try {
      const item = window.localStorage.getItem(key);
      // Parse stored json or if none return initialValue
      return item ? JSON.parse(item) : initialValue;
    } catch (error) {
      // If error also return initialValue
      console.error(error);
      return initialValue;
    }
  });

  // useEffect to update local storage when the state changes
  useEffect(() => {
    try {
      window.localStorage.setItem(key, JSON.stringify(storedValue));
    } catch (error) {
      console.error(error);
    }
  }, [key, storedValue]); // Only re-call effect if key or storedValue changes

  return [storedValue, setStoredValue];
}

// Example Usage:
// function ThemeSwitcher() {
//   const [theme, setTheme] = useLocalStorage('app-theme', 'light');

//   const toggleTheme = () => {
//     setTheme(theme === 'light' ? 'dark' : 'light');
//   };

//   return (
//     <div>
//       <p>Current theme: {theme}</p>
//       <button onClick={toggleTheme}>Toggle Theme</button>
//     </div>
//   );
// }