<?php
global $post;
$category_id = get_post_meta($post->ID, 'dynamic-menu', true);
$term = get_term_by('name', $category_id, 'category');
if($term != false) {
    $category_id = $term->term_id;
    update_post_meta($post->ID, 'dynamic-menu', $category_id);
}


if(!empty($category_id) && $category_id != 0) {
    //testing resets
    delete_transient('dynamic-menu');

    $prebuilt_menu = get_transient('dynamic-menu', array());
    if(!empty($prebuilt_menu[$category_id])) { echo $prebuilt_menu[$category_id]; }
    else {
        $cats = get_categories(array('child_of' => $category_id, 'order_by' => 'id', 'order' => 'asc'));
        $exclude = array();
        foreach($cats as $cat) { $exclude[] = $cat->term_id; }
        ob_start(); ?>
        <ul id='collapsible-menu'>
        <?php $query = new WP_query(array('order' => 'desc', 'category__in' => array($category_id), 'orderby' => 'id', 'post_type' => array('post'), 'category__not_in' => $exclude )); ?>
        <?php while($query->have_posts()) : $query->the_post(); ?>
            <ul class="section">
                <li class="header"><a href="<?php the_permalink(); ?>"><?php echo theme_functions::menu_title($query->post->ID); ?></a></li>
            </ul>
        <?php endwhile; ?>
        <?php foreach($cats as $cat):
            $menu = get_term_by('name', $cat->name, 'nav_menu');
            if(isset($menu->term_id)) :
            $items = wp_get_nav_menu_items($menu->term_id); ?>
            <ul class="section">
                <li class="header"><?php echo $cat->name; ?></li>
                <li class="children">
                    <ul>
                    <?php foreach((array)$items as $key => $menu_item) { echo "<li><a href='{$menu_item->url}'>{$menu_item->title}</a></li>"; } ?>
                    </ul>
                </li>
            </ul>
            <?php
            else:
            $query = new WP_query(array(
                'category__in' => array($cat->term_id),
                'orderby' => 'id',
                'order' => 'desc',
                'post_type' => array('post'),
                'nopaging' => true));
            ?>
            <ul class="section">
                <li class="header"><?php echo $cat->name; ?></li>
                <li class="children">
                    <ul>
                    <?php while($query->have_posts()) : $query->the_post(); ?>
                        <li><a href="<?php the_permalink(); ?>"><?php echo theme_functions::menu_title($query->post->ID); ?></a></li>
                    <?php endwhile; ?>
                    </ul>
                </li>
            </ul>
            <?php endif; ?>
        <?php endforeach; ?>
        </ul>
        <?php
        $menu = ob_get_contents();
        ob_end_flush();
        $prebuilt_menu[$category_id] = $menu;
        set_transient('dynamic-menu', $prebuilt_menu, 60*60*12);
    }
}
?>