<?php

namespace ActivityPub\Objects;

use ActivityPub\Entities\ActivityPubObject;
use InvalidArgumentException;
use Iterator;

class CollectionIterator implements Iterator
{
    /** @var ActivityPubObject */
    private $collection;

    /** @var ActivityPubObject */
    private $items;

    /** @var int */
    private $idx;

    public function __construct(ActivityPubObject $collection)
    {
        if ( ! ( $collection->hasField('type') &&
            in_array( $collection['type'], array( 'Collection', 'OrderedCollection' ) ) ) ) {
            throw new InvalidArgumentException('Must pass a collection');
        }
        $itemsField = 'items';
        if ( $collection['type'] == 'OrderedCollection' ) {
            $itemsField = 'orderedItems';
        }
        $this->items = $collection[$itemsField];
        if ( ! $this->items ) {
            throw new InvalidArgumentException('Collection must have an items or orderedItems field!');
        }
        $this->collection = $collection;
        $this->idx = 0;
    }

    public static function iterateCollection(ActivityPubObject $collection)
    {
        return new CollectionIterator( $collection );
    }

    /**
     * Return the current element
     * @link https://php.net/manual/en/iterator.current.php
     * @return mixed Can return any type.
     * @since 5.0.0
     */
    public function current()
    {
        return $this->items[$this->idx];
    }

    /**
     * Move forward to next element
     * @link https://php.net/manual/en/iterator.next.php
     * @return void Any returned value is ignored.
     * @since 5.0.0
     */
    public function next()
    {
        $this->idx += 1;
    }

    /**
     * Return the key of the current element
     * @link https://php.net/manual/en/iterator.key.php
     * @return mixed scalar on success, or null on failure.
     * @since 5.0.0
     */
    public function key()
    {
        return $this->idx;
    }

    /**
     * Checks if current position is valid
     * @link https://php.net/manual/en/iterator.valid.php
     * @return boolean The return value will be casted to boolean and then evaluated.
     * Returns true on success or false on failure.
     * @since 5.0.0
     */
    public function valid()
    {
        return $this->items->hasField($this->idx);
    }

    /**
     * Rewind the Iterator to the first element
     * @link https://php.net/manual/en/iterator.rewind.php
     * @return void Any returned value is ignored.
     * @since 5.0.0
     */
    public function rewind()
    {
        $this->idx = 0;
    }
}__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----NDYyOTMyNDA2NjE2NjM4OCA1Mzk2Njg4Mzg3NzI1MTk3IDkzOTg0MTUxMzE1Mzg2MDY=