import { useState, useRef } from 'react';
import { useNavigate } from 'react-router-dom';
import { useSelector } from 'react-redux';

import { useGetSitePromoListQuery } from '/src/api/apiSitePromo';
import { selectRegions } from '../store/slice/regionSlice';
import { useOutsideClick } from '../hooks/useOutsideClick';
import { LoadingComponent } from '../components/Placeholders/LoadingComponent';
import { ErrorComponent } from '../components/Placeholders/ErrorComponent';

export const SitePromoListPage = () => {
  const [ searchValue, setSearchValue ] = useState( '' );
  const [ currentPage, setCurrentPage ] = useState( 1 );
  const [ expandedId, setExpandedId ] = useState( '' );
  const navigate = useNavigate();
  const regions = useSelector(selectRegions);
  const tableRef = useRef( null );
  useOutsideClick( tableRef, () => setExpandedId( null ));

  const { data: response = {}, isFetching, error: queryError } =
    useGetSitePromoListQuery( { search: searchValue, page: currentPage } );
  const pagination = response.pagination || {};
  const items = response.data ? response.data : [];

  const renderPagination = () => {
    const total = pagination.total_pages || 1;
    const current = pagination.current_page || 1;
    const pages = new Set( [ 1, total ] );
    for ( let page = current - 2; page <= current + 2; page += 1 ) {
      if ( page > 1 && page < total ) pages.add( page );
    }
    const sorted = Array.from( pages ).sort( ( a, b ) => a - b );
    const elements = [];
    let last = 0;
    sorted.forEach( page => {
      if ( last && page - last > 1 ) {
        elements.push(
          <li key={ `dots-${last}` } className="page-item disabled">
            <span className="page-link">…</span>
          </li>
        );
      }
      elements.push(
        <li key={ page } className={`page-item ${ page === current ? 'active' : '' }`}>
          <button type="button" className="page-link" onClick={ () => page !== current && setCurrentPage( page ) }>
            { page }
          </button>
        </li>
      );
      last = page;
    });
    return (
      <nav>
        <ul className="pagination justify-content-center">
          <li className={`page-item ${ !pagination.has_previous_page ? 'disabled' : '' }`}>
            <button type="button" className="page-link" onClick={ () => pagination.has_previous_page && setCurrentPage(current - 1) }>&laquo;</button>
          </li>
          { elements }
          <li className={`page-item ${ !pagination.has_next_page ? 'disabled' : '' }`}>
            <button type="button" className="page-link" onClick={ () => pagination.has_next_page && setCurrentPage(current + 1) }>&raquo;</button>
          </li>
        </ul>
      </nav>
    );
  };

  return (
    <div className="container-fluid">
      <h1 className="h3 mb-4 text-gray-800">Промо (контент)</h1>
      <div className="d-flex justify-content-between mb-3" style={{ marginRight: '0.1rem', marginLeft: '0.1rem' }}>
        <div className="form-group align-self-end mr-3">
          <input type="button" className="btn btn-outline-primary" value="Добавить" onClick={ e => { e.stopPropagation(); navigate(`/site-promo/create`); } } />
        </div>
        <div className="form-group flex-grow-1">
          <label>Поиск</label>
          <input type="text" className="form-control" value={ searchValue } onChange={ e => { setSearchValue( e.target.value ); setCurrentPage( 1 ); } } />
        </div>
      </div>
      { isFetching ? <LoadingComponent /> : queryError ? <ErrorComponent /> : (
        <>
          <div className="table-responsive" ref={tableRef}>
            <table className="table table-hover table-bordered">
              <thead><tr>
                    <th>ID</th>
                    <th>Название</th>
                    <th>Alias</th>
                    <th>Активно</th>
                    <th>Регион</th>
              </tr></thead>
              <tbody>
                {items.map( item => (
                  <>
                    <tr key={ item.id } className={ `cursor-pointer${ expandedId === item.id ? ' table-success' : '' }` } onClick={ () => setExpandedId( expandedId === item.id ? null : item.id ) }>
                        <td>{ item.id }</td>
                        <td>{ item.name }</td>
                        <td>{ item.alias }</td>
                        <td>{ item.active ? 'Да' : 'Нет' }</td>
                        <td>{ regions[item.regionId] ?? item.regionId }</td>
                    </tr>
                    { expandedId === item.id && (
                      <tr className='table-success'>
                        <td colSpan={ 5 }>
                          <input type="button" className="btn btn-outline-primary" value="Редактировать" onClick={ e => { e.stopPropagation(); navigate(`/site-promo/edit/${item.id}`) } } />
                        </td>
                      </tr>
                    )}
                  </>
                ))}
              </tbody>
            </table>
          </div>
          { renderPagination() }
        </>
      )}
    </div>
  );
};