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<?php


namespace Twilio;


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

    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 &gt;= 5.0.0)<br/>
     * Return the current element
     * @link http://php.net/manual/en/iterator.current.php
     * @return mixed Can return any type.
     */
    public function current() {
        return $this->page->current();
    }

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

    /**
     * (PHP 5 &gt;= 5.0.0)<br/>
     * Checks if current position is valid
     * @link http://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.
     */
    public function valid() {
        return $this->page && $this->page->valid() && !$this->overLimit() && !$this->overPageLimit();
    }

    /**
     * (PHP 5 &gt;= 5.0.0)<br/>
     * 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() {
        $this->page = $this->firstPage;
        $this->page->rewind();
        $this->currentPage = 1;
        $this->currentRecord = 1;
    }

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

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

}