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<?php

namespace Twilio;

class Stream implements \Iterator {
    public $page;
    public $firstPage;
    public $limit;
    public $currentRecord;
    public $pageLimit;
    public $currentPage;

public function __construct(Page $page, $limit, $pageLimit) {
        $this->page = $page;
        $this->firstPage = $page;
        $this->limit = $limit;
        $this->currentRecord = 1;
        $this->pageLimit = $pageLimit;
        $this->currentPage = 1;
    }

/**
 * (PHP 5 >= 5.0.0) 
 * Return the current element
 * @link http://php.net/manual/en/iterator.current.php
 * @return mixed Can return any type.
 */
 #[\ReturnTypeWillChange]
 public function current() {
 return $this->page->current();
 }

/**
 * (PHP 5 >= 5.0.0) 
 * Move forward to next element
 * @link http://php.net/manual/en/iterator.next.php
 * @return void Any returned value is ignored.
 */
 public function next(): void {
 $this->page->next();
 $this->currentRecord++;

if ($this->overLimit()) {
            return;
        }

if (!$this->page->valid()) {
            if ($this->overPageLimit()) {
                return;
            }
            $this->page = $this->page->nextPage();
            $this->currentPage++;
        }
    }

/**
 * (PHP 5 >= 5.0.0) 
 * Return the key of the current element
 * @link http://php.net/manual/en/iterator.key.php
 * @return mixed scalar on success, or null on failure.
 */
 #[\ReturnTypeWillChange]
 public function key() {
 return $this->currentRecord;
 }

/**
 * (PHP 5 >= 5.0.0) 
 * Checks if current position is valid
 * @link http://php.net/manual/en/iterator.valid.php
 * @return bool The return value will be casted to boolean and then evaluated.
 * Returns true on success or false on failure.
 */
 public function valid(): bool {
 return $this->page && $this->page->valid() && !$this->overLimit() && !$this->overPageLimit();
 }

/**
 * (PHP 5 >= 5.0.0) 
 * Rewind the Iterator to the first element
 * @link http://php.net/manual/en/iterator.rewind.php
 * @return void Any returned value is ignored.
 */
 public function rewind(): void {
 $this->page = $this->firstPage;
 $this->page->rewind();
 $this->currentPage = 1;
 $this->currentRecord = 1;
 }

protected function overLimit(): bool {
 return ($this->limit !== null
 && $this->limit !== Values::NONE
 && $this->limit < $this->currentRecord);
 }

protected function overPageLimit(): bool {
 return ($this->pageLimit !== null
 && $this->pageLimit !== Values::NONE
 && $this->pageLimit < $this->currentPage);
 }

}