/**
 * Undo demo setup and reverts back to state before importing the sample contents.
 * Does not remove post/pages that have been modified by the user.
 *
 * @since 1.7.6
 */
function themify_undo_import_sample_content()
{
    do_action('themify_before_demo_erase');
    themify_import_sample_content_setup();
    $import = new Themify_Import();
    $data = $import->parse(themify_get_sample_content_file());
    foreach ($data['categories'] as $cat) {
        $term_id = term_exists($cat['category_nicename'], 'category');
        if ($term_id) {
            if (is_array($term_id)) {
                $term_id = $term_id['term_id'];
            }
            if (isset($cat['term_id'])) {
                wp_delete_category($term_id);
            }
        }
    }
    foreach ($data['tags'] as $tag) {
        $term_id = term_exists($tag['tag_slug'], 'post_tag');
        if ($term_id) {
            if (is_array($term_id)) {
                $term_id = $term_id['term_id'];
            }
            if (isset($tag['term_id'])) {
                wp_delete_term($term_id, 'post_tag');
            }
        }
    }
    foreach ($data['terms'] as $term) {
        $term_id = term_exists($term['slug'], $term['term_taxonomy']);
        if ($term_id) {
            if (is_array($term_id)) {
                $term_id = $term_id['term_id'];
            }
            if (isset($term['term_id'])) {
                wp_delete_term($term_id, $term['term_taxonomy']);
            }
        }
    }
    foreach ($data['posts'] as $post) {
        $post_exists = post_exists($post['post_title'], '', $post['post_date']);
        if ($post_exists && get_post_type($post_exists) == $post['post_type']) {
            /* check if the post has not been modified since it was created */
            if ($post['post_date'] == get_post_field('post_modified', $post_exists)) {
                wp_delete_post($post_exists, true);
                // true: bypass trash
            }
        }
    }
    do_action('themify_after_demo_erase');
}