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✏️ Editing: Collection.php

<?php

namespace Stripe;

/**
 * Class Collection.
 *
 * @template TStripeObject of StripeObject
 * @template-implements \IteratorAggregate<TStripeObject>
 *
 * @property string $object
 * @property string $url
 * @property bool $has_more
 * @property TStripeObject[] $data
 */
class Collection extends StripeObject implements \Countable, \IteratorAggregate
{
    const OBJECT_NAME = 'list';

use ApiOperations\Request;

/** @var array */
    protected $filters = [];

/**
     * @return string the base URL for the given class
     */
    public static function baseUrl()
    {
        return Stripe::$apiBase;
    }

/**
     * Returns the filters.
     *
     * @return array the filters
     */
    public function getFilters()
    {
        return $this->filters;
    }

/**
     * Sets the filters, removing paging options.
     *
     * @param array $filters the filters
     */
    public function setFilters($filters)
    {
        $this->filters = $filters;
    }

#[\ReturnTypeWillChange]
    public function offsetGet($k)
    {
        if (\is_string($k)) {
            return parent::offsetGet($k);
        }
        $msg = "You tried to access the {$k} index, but Collection " .
                   'types only support string keys. (HINT: List calls ' .
                   'return an object with a `data` (which is the data ' .
                   "array). You likely want to call ->data[{$k}])";

throw new Exception\InvalidArgumentException($msg);
    }

/**
     * @param null|array $params
     * @param null|array|string $opts
     *
     * @throws Exception\ApiErrorException
     *
     * @return Collection<TStripeObject>
     */
    public function all($params = null, $opts = null)
    {
        self::_validateParams($params);
        list($url, $params) = $this->extractPathAndUpdateParams($params);

list($response, $opts) = $this->_request('get', $url, $params, $opts);
        $obj = Util\Util::convertToStripeObject($response, $opts);
        if (!($obj instanceof \Stripe\Collection)) {
            throw new \Stripe\Exception\UnexpectedValueException(
                'Expected type ' . \Stripe\Collection::class . ', got "' . \get_class($obj) . '" instead.'
            );
        }
        $obj->setFilters($params);

return $obj;
    }

/**
     * @param null|array $params
     * @param null|array|string $opts
     *
     * @throws Exception\ApiErrorException
     *
     * @return TStripeObject
     */
    public function create($params = null, $opts = null)
    {
        self::_validateParams($params);
        list($url, $params) = $this->extractPathAndUpdateParams($params);

list($response, $opts) = $this->_request('post', $url, $params, $opts);

return Util\Util::convertToStripeObject($response, $opts);
    }

/**
     * @param string $id
     * @param null|array $params
     * @param null|array|string $opts
     *
     * @throws Exception\ApiErrorException
     *
     * @return TStripeObject
     */
    public function retrieve($id, $params = null, $opts = null)
    {
        self::_validateParams($params);
        list($url, $params) = $this->extractPathAndUpdateParams($params);

$id = Util\Util::utf8($id);
        $extn = \urlencode($id);
        list($response, $opts) = $this->_request(
            'get',
            "{$url}/{$extn}",
            $params,
            $opts
        );

return Util\Util::convertToStripeObject($response, $opts);
    }

/**
     * @return int the number of objects in the current page
     */
    #[\ReturnTypeWillChange]
    public function count()
    {
        return \count($this->data);
    }

/**
     * @return \ArrayIterator an iterator that can be used to iterate
     *    across objects in the current page
     */
    #[\ReturnTypeWillChange]
    public function getIterator()
    {
        return new \ArrayIterator($this->data);
    }

/**
     * @return \ArrayIterator an iterator that can be used to iterate
     *    backwards across objects in the current page
     */
    public function getReverseIterator()
    {
        return new \ArrayIterator(\array_reverse($this->data));
    }

/**
     * @return \Generator|TStripeObject[] A generator that can be used to
     *    iterate across all objects across all pages. As page boundaries are
     *    encountered, the next page will be fetched automatically for
     *    continued iteration.
     */
    public function autoPagingIterator()
    {
        $page = $this;

while (true) {
            $filters = $this->filters ?: [];
            if (\array_key_exists('ending_before', $filters)
                && !\array_key_exists('starting_after', $filters)) {
                foreach ($page->getReverseIterator() as $item) {
                    yield $item;
                }
                $page = $page->previousPage();
            } else {
                foreach ($page as $item) {
                    yield $item;
                }
                $page = $page->nextPage();
            }

if ($page->isEmpty()) {
                break;
            }
        }
    }

/**
     * Returns an empty collection. This is returned from {@see nextPage()}
     * when we know that there isn't a next page in order to replicate the
     * behavior of the API when it attempts to return a page beyond the last.
     *
     * @param null|array|string $opts
     *
     * @return Collection
     */
    public static function emptyCollection($opts = null)
    {
        return Collection::constructFrom(['data' => []], $opts);
    }

/**
     * Returns true if the page object contains no element.
     *
     * @return bool
     */
    public function isEmpty()
    {
        return empty($this->data);
    }

/**
     * Fetches the next page in the resource list (if there is one).
     *
     * This method will try to respect the limit of the current page. If none
     * was given, the default limit will be fetched again.
     *
     * @param null|array $params
     * @param null|array|string $opts
     *
     * @return Collection<TStripeObject>
     */
    public function nextPage($params = null, $opts = null)
    {
        if (!$this->has_more) {
            return static::emptyCollection($opts);
        }

$lastId = \end($this->data)->id;

$params = \array_merge(
            $this->filters ?: [],
            ['starting_after' => $lastId],
            $params ?: []
        );

return $this->all($params, $opts);
    }

/**
     * Fetches the previous page in the resource list (if there is one).
     *
     * This method will try to respect the limit of the current page. If none
     * was given, the default limit will be fetched again.
     *
     * @param null|array $params
     * @param null|array|string $opts
     *
     * @return Collection<TStripeObject>
     */
    public function previousPage($params = null, $opts = null)
    {
        if (!$this->has_more) {
            return static::emptyCollection($opts);
        }

$firstId = $this->data[0]->id;

$params = \array_merge(
            $this->filters ?: [],
            ['ending_before' => $firstId],
            $params ?: []
        );

return $this->all($params, $opts);
    }

/**
     * Gets the first item from the current page. Returns `null` if the current page is empty.
     *
     * @return null|TStripeObject
     */
    public function first()
    {
        return \count($this->data) > 0 ? $this->data[0] : null;
    }

/**
     * Gets the last item from the current page. Returns `null` if the current page is empty.
     *
     * @return null|TStripeObject
     */
    public function last()
    {
        return \count($this->data) > 0 ? $this->data[\count($this->data) - 1] : null;
    }

private function extractPathAndUpdateParams($params)
    {
        $url = \parse_url($this->url);
        if (!isset($url['path'])) {
            throw new Exception\UnexpectedValueException("Could not parse list url into parts: {$url}");
        }

if (isset($url['query'])) {
            // If the URL contains a query param, parse it out into $params so they
            // don't interact weirdly with each other.
            $query = [];
            \parse_str($url['query'], $query);
            $params = \array_merge($params ?: [], $query);
        }

return [$url['path'], $params];
    }
}

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