import { useState, useEffect } from 'react';

function useDebounce(value, delay) {
  const [debouncedValue, setDebouncedValue] = useState(value);

  useEffect(() => {
    // Set debouncedValue to value (passed in) after the specified delay
    const handler = setTimeout(() => {
      setDebouncedValue(value);
    }, delay);

    // Return a cleanup function that will be called every time useEffect is re-executed
    // or when the component unmounts. This clears the timeout if value changes
    // before the delay has passed, ensuring only the last value is debounced.
    return () => {
      clearTimeout(handler);
    };
  }, [value, delay]); // Only re-call effect if value or delay changes

  return debouncedValue;
}

// Usage example:
// function SearchInput() {
//   const [searchTerm, setSearchTerm] = useState('');
//   const debouncedSearchTerm = useDebounce(searchTerm, 500); // 500ms debounce

//   useEffect(() => {
//     if (debouncedSearchTerm) {
//       console.log('Fetching data for:', debouncedSearchTerm);
//       // Perform API call or heavy computation here
//     }
//   }, [debouncedSearchTerm]);

//   return (
//     <input
//       type="text"
//       placeholder="Search..."
//       value={searchTerm}
//       onChange={(e) => setSearchTerm(e.target.value)}
//     />
//   );
// }