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<?php


namespace Twilio;


use Twilio\Exceptions\DeserializeException;
use Twilio\Exceptions\RestException;
use Twilio\Http\Response;

abstract class Page implements \Iterator {
    protected static $metaKeys = array(
        'end',
        'first_page_uri',
        'next_page_uri',
        'last_page_uri',
        'page',
        'page_size',
        'previous_page_uri',
        'total',
        'num_pages',
        'start',
        'uri',
    );

    protected $version;
    protected $payload;
    protected $solution;
    protected $records;

    abstract public function buildInstance(array $payload);

    public function __construct(Version $version, Response $response) {
        $payload = $this->processResponse($response);

        $this->version = $version;
        $this->payload = $payload;
        $this->solution = array();
        $this->records = new \ArrayIterator($this->loadPage());
    }

    protected function processResponse(Response $response) {
        if ($response->getStatusCode() != 200 && !$this->isPagingEol($response->getContent())) {
            $message = '[HTTP ' . $response->getStatusCode() . '] Unable to fetch page';
            $code = $response->getStatusCode();

            $content = $response->getContent();

            if (\is_array($content)) {
                $message .= isset($content['message']) ? ': ' . $content['message'] : '';
                $code = isset($content['code']) ? $content['code'] : $code;
            }

            throw new RestException($message, $code, $response->getStatusCode());
        }
        return $response->getContent();
    }

    protected function isPagingEol($content) {
        return !\is_null($content) && \array_key_exists('code', $content) && $content['code'] == 20006;
    }

    protected function hasMeta($key) {
        return \array_key_exists('meta', $this->payload) && \array_key_exists($key, $this->payload['meta']);
    }

    protected function getMeta($key, $default=null) {
        return $this->hasMeta($key) ? $this->payload['meta'][$key] : $default;
    }

    protected function loadPage() {
        $key = $this->getMeta('key');
        if ($key) {
            return $this->payload[$key];
        } else {
            $keys = \array_keys($this->payload);
            $key = \array_diff($keys, self::$metaKeys);
            $key = \array_values($key);

            if (\count($key) == 1) {
                return $this->payload[$key[0]];
            }
        }

        // handle end of results error code
        if ($this->isPagingEol($this->payload)) {
            return array();
        }

        throw new DeserializeException('Page Records can not be deserialized');
    }

    public function getPreviousPageUrl() {
        if ($this->hasMeta('previous_page_url')) {
            return $this->getMeta('previous_page_url');
        } else if (\array_key_exists('previous_page_uri', $this->payload) && $this->payload['previous_page_uri']) {
            return $this->getVersion()->getDomain()->absoluteUrl($this->payload['previous_page_uri']);
        }
        return null;
    }

    public function getNextPageUrl() {
        if ($this->hasMeta('next_page_url')) {
            return $this->getMeta('next_page_url');
        } else if (\array_key_exists('next_page_uri', $this->payload) && $this->payload['next_page_uri']) {
            return $this->getVersion()->getDomain()->absoluteUrl($this->payload['next_page_uri']);
        }
        return null;
    }

    public function nextPage() {
        if (!$this->getNextPageUrl()) {
            return null;
        }

        $response = $this->getVersion()->getDomain()->getClient()->request('GET', $this->getNextPageUrl());
        return new static($this->getVersion(), $response, $this->solution);
    }

    public function previousPage() {
        if (!$this->getPreviousPageUrl()) {
            return null;
        }

        $response = $this->getVersion()->getDomain()->getClient()->request('GET', $this->getPreviousPageUrl());
        return new static($this->getVersion(), $response, $this->solution);
    }

    /**
     * (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 $this->buildInstance($this->records->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->records->next();
    }

    /**
     * (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->records->key();
    }

    /**
     * (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->records->valid();
    }

    /**
     * (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->records->rewind();
    }


    /**
     * @return Version
     */
    public function getVersion() {
        return $this->version;
    }

    public function __toString() {
        return '[Page]';
    }

}