/**
 * Get the placeholder image URL for courses
 *
 * @access public
 * @return string
 */
function llms_placeholder_img_src() {
	return apply_filters( 'lifterlms_placeholder_img_src', llms()->plugin_url() . '/assets/images/placeholder.png' );
}

/**
 * Get the placeholder image
 *
 * @access public
 * @return string
 */
function llms_placeholder_img( $size = 'full' ) {
	return apply_filters( 'lifterlms_placeholder_img', '<img src="' . llms_placeholder_img_src() . '" alt="placeholder" class="llms-placeholder llms-featured-image wp-post-image" />' );
}

/**
 * Get the featured image.
 *
 * @since unknown
 * @since 7.1.2 Fix bug when the featured image file is not available.
 *
 * @access public
 *
 * @param int|WP_Post  $post_id Post ID or WP_Post object.
 * @param string|int[] $size    Accepts any registered image size name, or an array of width and height values in pixels (in that order).
 * @return string
 */
function llms_featured_img( $post_id, $size ) {
	$img  = wp_get_attachment_image_src( get_post_thumbnail_id( $post_id ), $size );
	$html = '';

	if ( isset( $img[0] ) ) {
		$html = '<img src="' . $img[0] . '" alt="' . get_the_title( $post_id ) . '" class="llms-featured-image wp-post-image">';
	}

	/**
	 * Filters the featured image of a given LifterLMS post.
	 *
	 * @since unknown
	 * @since 7.1.2 Added `$post_id` parameter.