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import React, { useState, useEffect } from 'react';
import { useReducer } from 'react';

const stateReducer = (state, action) => {
  switch (action.type) {
    case 'ADD_ITEM':
      return { ...state, items: [...state.items, action.payload] };
    case 'REMOVE_ITEM':
      return { 
        ...state, 
        items: state.items.filter((_, index) => index !== action.payload)
      };
    default:
      return state;
  }
};

const OptimizedState = () => {
  const [state, dispatch] = useReducer(stateReducer, { items: [] });
  const [input, setInput] = useState('');

  const addItem = () => {
    if (input.trim()) {
      dispatch({ type: 'ADD_ITEM', payload: input });
      setInput('');
    }
  };

  return (
    <div>
      <input 
        type="text" 
        value={input} 
        onChange={(e) => setInput(e.target.value)}
        placeholder="Add an item"
      />
      <button onClick={addItem}>Add</button>
      <ul>
        {state.items.map((item, index) => (
          <li key={index}>
            {item}
            <button onClick={() => dispatch({ type: 'REMOVE_ITEM', payload: index })}>
              Remove
            </button>
          </li>
        ))}
      </ul>
    </div>
  );
};

export default OptimizedState;