<?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:----MzA1MTUxODYyNjY0Mjc4NCA5MTAyNTY3MTU5NzU5NjIzIDY4NTYwNjc0ODk1MjIyNjM=