import React, { useState } from 'react';
import { FaBook, FaSearch, FaChevronLeft, FaChevronRight } from 'react-icons/fa';
import '../styles/BookList.css';

/**
 * Componente para mostrar y buscar libros en el catálogo
 */
const BookList = ({ books, onBookSelect, isLoading }) => {
  const [searchTerm, setSearchTerm] = useState('');
  const [currentPage, setCurrentPage] = useState(1);
  const [itemsPerPage, setItemsPerPage] = useState(10);

  // Filtrar libros según el término de búsqueda
  const filteredBooks = books.filter((book) =>
    book.title.toLowerCase().includes(searchTerm.toLowerCase())
  );

  // Calcular paginación
  const totalPages = Math.ceil(filteredBooks.length / itemsPerPage);
  const startIndex = (currentPage - 1) * itemsPerPage;
  const endIndex = startIndex + itemsPerPage;
  const currentBooks = filteredBooks.slice(startIndex, endIndex);

  // Resetear a la primera página cuando cambia la búsqueda o items por página
  const handleSearchChange = (value) => {
    setSearchTerm(value);
    setCurrentPage(1);
  };

  const handleItemsPerPageChange = (value) => {
    setItemsPerPage(Number(value));
    setCurrentPage(1);
  };

  const goToPage = (page) => {
    setCurrentPage(Math.max(1, Math.min(page, totalPages)));
  };

  if (isLoading) {
    return (
      <div className="book-list-container">
        <div className="loading">
          <div className="spinner"></div>
          <p>Cargando catálogo desde IPFS...</p>
        </div>
      </div>
    );
  }

  return (
    <div className="book-list-container">
      <div className="search-box" role="search">
        <label htmlFor="search-input" className="visually-hidden">Buscar libros por título</label>
        <FaSearch className="search-icon" aria-hidden="true" />
        <input
          id="search-input"
          type="search"
          placeholder="Buscar libros por título..."
          value={searchTerm}
          onChange={(e) => handleSearchChange(e.target.value)}
          className="search-input"
          aria-label="Buscar libros"
          aria-describedby="search-results-count"
          aria-controls="book-list"
        />
        {searchTerm && (
          <button
            className="clear-search"
            onClick={() => handleSearchChange('')}
            aria-label="Limpiar búsqueda"
          >
            ✕
          </button>
        )}
      </div>

      <div className="controls-bar">
        <div className="book-count" id="search-results-count" role="status" aria-live="polite" aria-atomic="true">
          {filteredBooks.length} {filteredBooks.length === 1 ? 'libro encontrado' : 'libros encontrados'}
        </div>
        
        <div className="items-per-page">
          <label htmlFor="items-per-page">Mostrar:</label>
          <select
            id="items-per-page"
            value={itemsPerPage}
            onChange={(e) => handleItemsPerPageChange(e.target.value)}
            className="items-select"
            aria-label="Libros por página"
            aria-describedby="search-results-count"
            aria-controls="book-list"
          >
            <option value={10}>10</option>
            <option value={50}>50</option>
            <option value={100}>100</option>
          </select>
          <span>por página</span>
        </div>
      </div>

      <ul className="book-list" id="book-list" role="list" aria-label="Lista de libros">
        {filteredBooks.length === 0 ? (
          <li className="no-results" role="status">
            <FaBook className="no-results-icon" aria-hidden="true" />
            <p>No se encontraron libros</p>
            <small>Intenta con otros términos de búsqueda</small>
          </li>
        ) : (
          currentBooks.map((book, index) => (
            <li key={book.id} className="book-list-item" role="listitem">
              <a
                href={`?epub=${book.ipfsHash}&gateway=${encodeURIComponent(window.location.origin)}`}
                className="book-item"
                onClick={(e) => {
                  e.preventDefault();
                  onBookSelect(book);
                }}
                aria-label={`Abrir libro: ${book.title}`}
              >
                <FaBook className="book-icon" aria-hidden="true" />
                <div className="book-info">
                  <h3 className="book-title">{book.title}</h3>
                  <p className="book-filename" aria-label={`Archivo: ${book.filename}`}>
                    <small>{book.filename}</small>
                  </p>
                </div>
              </a>
            </li>
          ))
        )}
      </ul>

      {totalPages > 1 && (
        <nav className="pagination" role="navigation" aria-label="Paginación de libros">
          <button
            className="pagination-button"
            onClick={() => goToPage(currentPage - 1)}
            disabled={currentPage === 1}
            aria-label="Ir a página anterior"
            aria-disabled={currentPage === 1}
          >
            <FaChevronLeft aria-hidden="true" />
            <span className="visually-hidden">Anterior</span>
          </button>
          
          <div className="pagination-info">
            <label htmlFor="page-input" className="visually-hidden">Ir a página número</label>
            <span aria-hidden="true">Página </span>
            <input
              id="page-input"
              type="number"
              min="1"
              max={totalPages}
              value={currentPage}
              onChange={(e) => goToPage(Number(e.target.value))}
              className="page-input"
              aria-label={`Página actual ${currentPage} de ${totalPages}`}
            />
            <span aria-hidden="true"> de {totalPages}</span>
          </div>
          
          <button
            className="pagination-button"
            onClick={() => goToPage(currentPage + 1)}
            disabled={currentPage === totalPages}
            aria-label="Ir a página siguiente"
            aria-disabled={currentPage === totalPages}
          >
            <FaChevronRight aria-hidden="true" />
            <span className="visually-hidden">Siguiente</span>
          </button>
        </nav>
      )}
    </div>
  );
};

export default BookList;