product by category

Hi everyone.
I am using categories and attributes form my products.

I obtain a list of my attributes like this.

echo '<ul>';
    $terms = get_terms( 'pa_country' );
    foreach($terms as $item_term ): ?>
      <li class="data_tag">
      <?php $term_link = get_term_link( $item_term ) ?>

         <a href="<?php echo  $term_link; ?>" class="name_category"> <?php echo $item_term->name; ?> </a>
          <img src="<?php echo get_template_directory_uri(); ?>/img/<?php echo $item_term->name; ?>.jpg" class="img-responsive"/>
      </li>
    <?php endforeach;
    echo '</ul>';

when I click in the links this show me all the product with the same attribute, but How to do , if I want the product by category and attribute…

For example, I have three products all with attribute “dark” but two of this are from category “day” and the other one is category “night”

Now when I click in the link this show me three, but I want to show the categories like Day (2product) and Night (1 product) How to do that?

Any idea, thanks in advances!

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