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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 = [
        '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 = [];
        $this->records = new \ArrayIterator($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();
            $details = [];
            $moreInfo = '';

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

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

protected function isPagingEol(?array $content): bool {
        return $content !== null && \array_key_exists('code', $content) && $content['code'] === 20006;
    }

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

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

protected function loadPage(): array {
        $key = $this->getMeta('key');
        if ($key) {
            return $this->payload[$key];
        }

$keys = \array_keys($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 [];
        }

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

public function getPreviousPageUrl(): ?string {
        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(): ?string {
        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(): ?Page {
        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(): ?Page {
        if (!$this->getPreviousPageUrl()) {
            return null;
        }

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

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

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

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

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

public function getVersion(): Version {
        return $this->version;
    }

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

}