pomodoro/src/hooks/useLocalStorage.ts

import { useState, useCallback } from 'react';

export function useLocalStorage<T>(key: string, initialValue: T): [T, (value: T | ((prev: T) => T)) => void] {
  const [storedValue, setStoredValue] = useState<T>(() => {
    if (typeof window === 'undefined') {
      return initialValue;
    }
    try {
      const item = window.localStorage.getItem(key);
      return item ? JSON.parse(item) : initialValue;
    } catch (error) {
      console.warn(`Error reading localStorage key "${key}":`, error);
      return initialValue;
    }
  });

  const setValue = useCallback((value: T | ((prev: T) => T)) => {
    try {
      const valueToStore = value instanceof Function ? value(storedValue) : value;
      setStoredValue(valueToStore);
      if (typeof window !== 'undefined') {
        window.localStorage.setItem(key, JSON.stringify(valueToStore));
      }
    } catch (error) {
      console.warn(`Error setting localStorage key "${key}":`, error);
    }
  }, [key, storedValue]);

  return [storedValue, setValue];
}