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<?php

namespace Braintree;

use Iterator;

/**
 * Braintree ResourceCollection
 * ResourceCollection is a container object for result data
 *
 * stores and retrieves search results and aggregate data
 *
 * example:
 * <code>
 * $result = Customer::all();
 *
 * foreach($result as $transaction) {
 *   print_r($transaction->id);
 * }
 * </code>
 */
class ResourceCollection implements Iterator
{
    private $_batchIndex;
    private $_ids;
    private $_index;
    private $_items;
    private $_pageSize;
    private $_pager;

    // phpcs:ignore PEAR.Commenting.FunctionComment.Missing
    public function __construct($response, $pager)
    {
        $this->_pageSize = $response["searchResults"]["pageSize"];
        $this->_ids = $response["searchResults"]["ids"];
        $this->_pager = $pager;
    }

    /**
     * returns the current item when iterating with foreachi
     *
     * @return object
     */
    #[\ReturnTypeWillChange]
    public function current()
    {
        return $this->_items[$this->_index];
    }

    /**
     * returns the first item in the collection
     *
     * @return mixed
     */
    public function firstItem()
    {
        $ids = $this->_ids;

        if (!isset($ids[0])) {
            return null;
        }

        $page = $this->_getPage([$ids[0]]);
        return $page[0];
    }

    /*
     * returns null
     *
     * @return null
     */
    #[\ReturnTypeWillChange]
    public function key()
    {
        return null;
    }

    /**
     * advances to the next item in the collection when iterating with foreach
     *
     * @return object
     */
    #[\ReturnTypeWillChange]
    public function next()
    {
        ++$this->_index;
    }

    /**
     * rewinds the testIterateOverResults collection to the first item when iterating with foreach
     *
     * @return object
     */
    #[\ReturnTypeWillChange]
    public function rewind()
    {
        $this->_batchIndex = 0;
        $this->_getNextPage();
    }

    /**
     * returns whether the current item is valid when iterating with foreach
     *
     * @return bool
     */
    #[\ReturnTypeWillChange]
    public function valid()
    {
        if ($this->_index == count($this->_items) && $this->_batchIndex < count($this->_ids)) {
            $this->_getNextPage();
        }

        if ($this->_index < count($this->_items)) {
            return true;
        } else {
            return false;
        }
    }

    /*
     * returns a maximum count
     *
     * @return int
     */
    public function maximumCount()
    {
        return count($this->_ids);
    }

    private function _getNextPage()
    {
        if (empty($this->_ids)) {
            $this->_items = [];
        } else {
            $this->_items = $this->_getPage(array_slice($this->_ids, $this->_batchIndex, $this->_pageSize));
            $this->_batchIndex += $this->_pageSize;
            $this->_index = 0;
        }
    }

    private function _getPage($ids)
    {
        $object = $this->_pager['object'];
        $method = $this->_pager['method'];
        $methodArgs = [];
        foreach ($this->_pager['methodArgs'] as $arg) {
            array_push($methodArgs, $arg);
        }
        array_push($methodArgs, $ids);

        return call_user_func_array(
            [$object, $method],
            $methodArgs
        );
    }

    /**
     * returns all IDs in the collection
     *
     * @return array
     */
    public function getIds()
    {
        return $this->_ids;
    }
}