Nested if/else syntax for using diff. thumbnails for diff. post type

Hello,

I have a site that has 2 multimedia post types:
$media_type = ‘audio’;
$media_type = ‘video’;
and the site should pull the youtube thumbnail for the ‘video’ type and the post thumbnail for the ‘audio’ type, however, there isn’t any if/else statement to distinguish between the two types for what image to use (this was built by someone else and I’m trying to fix it).

I’m not sure (a.) if I should have the function inside functions.php do this or if it should be at the page template level.

This is what I have in functions.php — which tells WP to get one thing for ‘video’ but doesn’t tell it what to do for ‘audio’

function abc_media_thumbnail() { ?>
	<div class="thumb">
	  <!-- RUN TIME, CAST, etc... -->
	  <a>">
	    <?php $media_type = 'video';
	        get_youtube_thumbnail(get_field('media_url'));

	        $runtime = get_field('length');
	    ?>
	  </a>

	  <?php if (!empty($runtime)): ?>
	  	<div class="runtime"><?php echo $runtime; ?></div>
	  <?php endif; ?>

	  <div class='media-info'>
	    <p class='title'><a>"> <?php the_title(); ?></a></p>
	    <p class="date grayed"><?php the_time('F j, Y'); ?></p>
	  </div>
	</div>
<?php
}

This is what the page template has:

<?php get_header();
$url = get_bloginfo('url'); ?>

<div id="content">
  <?php if ( have_posts() ) while ( have_posts() ): the_post(); ?>
	  <?php
	  		$media_terms = get_the_terms($post->ID, 'media-type');

	  		if (is_array($media_terms)) {
	  			$media_type = array_pop($media_terms);
	  		}
	  ?>

	  <?php if (isset($media_type)): ?>

		    <div class="labels">
		      <a>slug; ?>"><?php echo $media_type->name; ?></a>
		    </div>
		    <div id="media" class="clearfix">
		      <?php
		        if ($media_type->slug == 'video') {
		          abc_video_post();
		        } else {
		          abc_audio_post();
		        }
		      ?>
		    </div>

	  <?php endif; ?>

  <?php endwhile;
    wp_reset_postdata();
  ?>

  <?php if (isset($media_type)): ?>

	  <h2 class="recent">Recently Featured</h2>
	  <?php
	    $args = array(
	      'posts_per_page' => 4,
	      'post__not_in' => array($post->ID),
	      'tax_query' => array(
	        array(
	          'taxonomy' => 'media-type',
	          'field' => 'slug',
	          'terms' => $media_type->slug
	        )
	      )
	    );
	    $recent_posts = new WP_Query( $args );
	    if ( $recent_posts->have_posts() ) while ( $recent_posts->have_posts() ): $recent_posts->the_post();
	      abc_media_thumbnail();
	    endwhile; ?>

  <?php endif; ?>

</div>

<?php get_sidebar(); ?>

<?php get_footer(); ?>

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Any help is much appreciated!