<?php
namespace ContentNation\ActivityPub\Common;

require_once("Collection.php");
class OrderedCollection extends Collection {
  /**
   * nested items
   * @var APObject[]
   */
  protected $items=[];

  public function __construct() {
    parent::__construct();
    parent::addContext('https://www.w3.org/ns/activitystreams');
  }
  /**
   * convert internal state to php array
   * @return array<string,mixed>
   */
  public function toObject() {
    $return = parent::toObject();
    $return['type'] = 'OrderedCollection';
    if ($this->totalItems > 0) {
      foreach($this->items as $item) {
        $return['OrderedItems'][] = $item->toObject();
      }
    }
    return $return;
  }

  /**
   * create object from json
   * @param array<string,mixed> $json input json
   * @return bool true on success
   */
  public function fromJson($json) : bool {
    return parent::fromJson($json);
  }

  public function append(APObject &$item) : void {
    $this->items[] = $item;
    $this->totalItems = sizeof($this->items);
  }

  /**
   * get item with given index
   * @return APObject|false
   */
  public function get(int $index) {
    if ($index >= 0) {
      if ($index >= $this->totalItems) {
        return false;
      }
      return $this->items[$index];
    } else {
      if ($this->totalItems+ $index < 0) {
        return false;
      }
      return $this->items[$this->totalItems + $index];
    }
  }

  /**
   * set items
   * @param APObject[] $items
   */
  public function setItems(&$items) : void {
    $this->items = $items;
    $this->totalItems = sizeof($items);
  }
}