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<?php
  $paged = $paged ?: 1;
  $view_num = 10;
  $the_query = new WP_Query([
    'post_type' => 'blog',
    'posts_per_page' => $view_num,
    'paged' => $paged,
  ]);
  $max_count = $the_query->found_posts;

  if ( $max_count > $view_num ) :
    $prev_url = $paged == 2 ? home_url( 'blog' ) : home_url( 'blog/page/'.($paged - 1) );
    $next_url = home_url( 'blog/page/'.($paged + 1) );
?>
<div class="c-paging">
  <ul class="c-paging__list">
    <li class="c-paging__item"><a href="<?php echo $prev_url ?>" class="c-paging__prev u-opacity <?php echo $paged == 1 ? '-disabled' : '' ?>" aria-label="前へ"></a></li>
    <?php
      $paging_max_num = ceil($max_count / $view_num);
      $paging_view_num = 5;
      $paging_start_num = 1;
      $paging_end_num = $paging_max_num > $paging_view_num ? $paging_view_num : $paging_max_num;
      $paging_end_harf_num = $paging_end_num / 2;

      if (ceil($paging_end_harf_num) < $paged) {
        $paging_start_num = $paged - floor($paging_end_harf_num);
        if ($paging_view_num < $paging_max_num) {
          $paging_end_num = $paged + floor($paging_end_harf_num);
        }
      }

      if ($paging_view_num < $paging_max_num && $paging_end_num > $paging_max_num) {
        $paging_start_num -= $paging_end_num - $paging_max_num;
        $paging_end_num = $paging_max_num;
      }

      for ( $i = $paging_start_num;$i <= $paging_end_num;$i++ ) :
        $url = $i == 1 ? home_url( 'blog' ) : home_url( 'blog/page/'.$i );
    ?>
    <li class="c-paging__item"><a href="<?php echo $url ?>" class="c-paging__number u-opacity <?php echo $i == $paged ? '-current' : '' ?>"><?php echo $i ?></a></li>
    <?php endfor ?>
    <li class="c-paging__item"><a href="<?php echo $next_url ?>" class="c-paging__next u-opacity <?php echo $paged == $paging_max_num ? '-disabled' : '' ?>" aria-label="次へ"></a></li>
  </ul>
</div>
<?php endif ?>