// Register Custom Post Types

function my_register_cpt() {

$labels = array(
'name'  => _x( 'symposium', 'Post Type General Name', 'gbc' ),
'singular_name'=> _x( 'Symposium', 'Post Type Singular Name', 'gbc' ),
'menu_name'  => __( 'Symposiums', 'gbc' ),
'name_admin_bar => __( 'Symposiums', 'gbc' ),
'all_items' => __( 'All Symposiums', 'gbc' ),
'view_item'           => __( 'View Symposium', 'gbc' ),
'add_new_item'        => __( 'Add New Symposium', 'gbc' ),
'add_new'             => __( 'Add New', 'gbc' ),
'edit_item'           => __( 'Edit Symposium', 'gbc' ),
'update_item'         => __( 'Update Symposium', 'gbc' ),
'search_items'        => __( 'Search Symposium', 'gbc' ),
'not_found'           => __( 'Not Found', 'gbc' ),
'not_found_in_trash'  => __( 'Not found in Trash', 'gbc' ),
);

$args = array(
'label'                 => __( 'Symposium', '1fix' ),
'labels'                => $labels,
'hierarchical'          => true,
'public'                => true,
'menu_icon'             => 'dashicons-carrot',
'menu_position'     => 5,
'supports' => array( 'title', 'editor','thumbnail', 'page-attributes' ),
);

register_post_type( 'symposium', $args );



$labels = array(
'name' => _x( 'presentation', 'Post Type General Name', 'gbc' ), 'singular_name' => _x( 'Presentations', 'Post Type Singular Name', 'gbc' ),
'menu_name'             => __( 'Presentations', 'gbc' ),
'name_admin_bar'        => __( 'Presentations', 'gbc' ),
'all_items'           => __( 'All Presentations', 'gbc' ),
'view_item'           => __( 'View Presentation', 'gbc' ),
'add_new_item'        => __( 'Add New Presentation', 'gbc' ),
'add_new'             => __( 'Add New', 'gbc' ),
'edit_item'           => __( 'Edit Presentation', 'gbc' ),
'update_item'         => __( 'Update Presentation', 'gbc' ),
'search_items'        => __( 'Search Presentation', 'gbc' ),
'not_found'           => __( 'Not Found', 'gbc' ),
'not_found_in_trash'  => __( 'Not found in Trash', 'gbc' ),);

$args = array(
'label' => __( 'Presentations', 'gbc' ),
'labels'                => $labels,
'hierarchical'          => false,
'public'                => true,
'rewrite' => array(
'slug'       => 'presentation',
'with_front' => false,
),
'menu_icon' => 'dashicons-money',
'show_in_menu' => 'edit.php?post_type=symposium'
);

register_post_type( 'presentation', $args );



$labels = array(
'name' => _x( 'speaker', 'Post Type General Name', 'gbc' ),
'singular_name' => _x( 'Speaker', 'Post Type Singular Name', 'gbc' ),
'menu_name' => __( 'Speakers', 'gbc' ),
'name_admin_bar' => __( 'Speakers', 'gbc' ),
'all_items' => __( 'All Speakers', 'gbc' ),
'view_item'           => __( 'View Speaker', 'gbc' ),
'add_new_item'        => __( 'Add New Speaker', 'gbc'),
'add_new'             => __( 'Add New', 'gbc' ),
'edit_item'           => __( 'Edit Speaker', 'gbc' ),
'update_item'         => __( 'Update Speaker', 'gbc' ),
'search_items'        => __( 'Search Speaker', 'gbc' ),
'not_found'           => __( 'Not Found', 'gbc' ),
'not_found_in_trash'  => __( 'Not found in Trash', 'gbc' ),
);

$args = array(
'label'        => __( 'Speakers', 'gbc' ),
'labels'       => $labels,
'hierarchical' => false,
'public'       => true,
'rewrite' => array(
'slug'       => 'speaker',
'with_front' => false,),
'menu_icon'    => 'dashicons-groups',
'show_in_menu' => 'edit.php?post_type=symposium',
'show_in_rest' => true,
'supports' => array( 'title', 'editor','thumbnail','page-attributes' ));

register_post_type( 'speaker', $args );



$labels = array(
'name'  => _x( 'session', 'Post Type General Name', 'gbc' ),
'singular_name' => _x( 'Session', 'Post Type Singular Name', 'gbc' ),
'menu_name' => __( 'Sessions', 'gbc' ),
'name_admin_bar' => __( 'Sessions', 'gbc' ));

$args = array(

'label' => __( 'Sessions', 'gbc' ),
'labels' => $labels,
'hierarchical' => false,
'public' => true,
'menu_icon' => 'dashicons-media-video',
'show_in_menu' => 'edit.php?post_type=symposium'
);

    register_post_type( 'session', $args );

}

add_action( 'init', 'my_register_cpt' );

function my_add_rewrite_rules() {
    global $wp_rewrite;

    // Presentation rewrite
add_rewrite_tag('%presentation%', '([^/]+)', 'presentation=');
add_permastruct('presentation','/%symposium%/presentation/%presentation%', false);
add_rewrite_rule('^presentation/([^/]+)/([^/]+)/?','index.php?presentation=$matches[2]','top');

    // Speaker rewrite
add_rewrite_tag('%speaker%', '([^/]+)', 'speaker=');
add_permastruct('speaker', '/%symposium%/speaker/%speaker%', false);
add_rewrite_rule('^speaker/?([^/]+)/([^/]+)/?','index.php?speaker=$matches[2]','top');

    $wp_rewrite->flush_rules();

}

add_action( 'init', 'my_add_rewrite_rules' );

function my_permalinks($permalink, $post, $leavename) {
    $post_id = $post->ID;

    if($post->post_type != 'speaker' && $post->post_type != 'presentation' && $post->post_type != 'session' || empty($permalink) || in_array($post->post_status, array('draft', 'pending', 'auto-draft'))){
    return $permalink;

    } else {

    $parent = $post->post_parent;
    $parent_post = get_post( $parent );
    $permalink = str_replace('%symposium%', $parent_post->post_name, $permalink);
    return $permalink;

    }
}

add_filter('post_type_link', 'my_permalinks', 10, 3);