<?php
namespace dominion\api;

use Yii;
use yii\console\Exception;
use linslin\yii2\curl;

class Swagger
{
    private $url;
    private $method;
    private $perPage;
    private $perPageParam;
    private $pageParam;
    private $params;
    private $content;
    private $currentPage = 1;
    private $lastPage = false;
    public $isRaw = false;

    function __construct($apiName, $function, $params = [], $urlParams = [], $version = false, $raw = false)
    {
        $arConfig = $this->getConfig($apiName, $function, $urlParams, $version);
        $this->url = $arConfig['url'];
        $this->method = $arConfig['method'];
        $this->perPage = $arConfig['perPage'];
        $this->perPageParam = $arConfig['perPageParam'];
        $this->pageParam = $arConfig['pageParam'];
        $this->content = $arConfig['content'];
        $this->params = $params;
        $this->isRaw = $raw;
    }

    private function getConfig($apiName, $function, $urlParams = [], $version = false)
    {
        $configParams = isset(Yii::$app->params[$apiName]) ? Yii::$app->params[$apiName] : [];
        if(empty($configParams)) {
            throw new Exception('Отсутствует конфигурация для rest-сервиса');
        }

        if(!isset($configParams['defaultVersion']) or (empty($configParams['defaultVersion']))) {
            throw new Exception('Отсутствует дефолтная версия для rest-сервиса');
        }

        if(!isset($configParams['defaultPerPage']) or (empty($configParams['defaultPerPage']))) {
            throw new Exception('Отсутствует дефолтная конфигурация постраничной навигации rest-сервиса');
        }

        if(!isset($configParams['protocol']) or empty($configParams['protocol'])) {
            throw new Exception('Протокол rest-сервиса не указан.');
        }

        if(($configParams['protocol'] !== 'http://') and ($configParams['protocol'] !== 'https://')) {
            throw new Exception('Протокол rest-сервиса указан неверно.');
        }

        if(!isset($configParams['perPageParam']) or empty($configParams['perPageParam'])) {
            throw new Exception('Отсутствует параметр постраничной навигации perPageParam.');
        }

        if(!isset($configParams['pageParam']) or empty($configParams['pageParam'])) {
            throw new Exception('Отсутствует парамер постраничной навигации pageParam.');
        }

        if(!isset($configParams['baseUrl']) or empty($configParams['baseUrl'])) {
            throw new Exception('Отсутствует доменное имя для rest-сервиса.');
        }

        if(empty($version)) {
            $version = $configParams['defaultVersion'];
        }

        if(empty($configParams['version'][$version])) {
            throw new Exception('Выбранная версия rest-сервиса отсутствует');
        }

        if(!isset($configParams['version'][$version]['functions'][$function])) {
            throw new Exception('Функция '.$function.' отсутствует в api версии '.$version);
        }

        $url = '';
        if(is_string($configParams['version'][$version]['functions'][$function]))
        {
            $url = $configParams['version'][$version]['functions'][$function];
        }
        elseif(isset($configParams['version'][$version]['functions'][$function]['url']))
        {
            $url = $configParams['version'][$version]['functions'][$function]['url'];
        }
        if(!isset($url) or empty($url)) {
            throw new Exception('Для функции '.$function.' отсутствует url');
        }

        if(isset($configParams['version'][$version]['functions'][$function]['content']))
        {
            $content = $configParams['version'][$version]['functions'][$function]['content'];
        }
        else
        {
            $content = $configParams['version'][$version]['content'];
        }

        if(!isset($content) or empty($content)) {
            throw new Exception('Для функции '.$function.' отсутствует ключ массива в котором содержится ответ');
        }

        if(!isset($configParams['version'][$version]['functions'][$function]['perPage']) or empty($configParams['version'][$version]['functions'][$function]['perPage'])) {
            $perPage = $configParams['defaultPerPage'];
        } else {
            $perPage = $configParams['version'][$version]['functions'][$function]['perPage'];
        }

        if(!isset($configParams['version'][$version]['functions'][$function]['method']) or
            empty($configParams['version'][$version]['functions'][$function]['method']))
        {
            $method = isset($configParams['version'][$version]['method']) ? $configParams['version'][$version]['method'] : 'GET';
        }
        else
        {
            $method = $configParams['version'][$version]['functions'][$function]['method'];
        }

        if(!empty($urlParams)) {
            $url = vsprintf($url, $urlParams);
        }

        return [
            'url' => $configParams['protocol']
                .$configParams['baseUrl']
                .$configParams['version'][$version]['url']
                .$url,
            'method' => $method,
            'perPage' => $perPage,
            'perPageParam' => $configParams['perPageParam'],
            'pageParam' => $configParams['pageParam'],
            'content' => $content,
        ];
    }

    public function resetCounter()
    {
        $this->currentPage = 1;
        $this->lastPage = false;
    }

    public function getNextPage()
    {
        if($this->lastPage) return false;
        $result = [];

        $response = $this->sendRequest($this->currentPage);

        if(isset($response[$this->content]))
        {
            foreach ($response[$this->content] as $value)
            {
                $result[] = $value;
            }
        }
        if(
            !isset($response['_meta']['pageCount']) or
            empty($response['_meta']['pageCount']) or
            $response['_meta']['pageCount'] === $this->currentPage
        ) {
          $this->lastPage = true;
        } else {
            $this->currentPage++;
        }

        return $result;
    }

    public function getOne()
    {
        $result = $this->getNextPage();
        return isset($result[0]) ? $result[0] : false;
    }

    public function doBatchRequest()
    {
        $result = [];
        $page = 1;
        while(true) {
            $response = $this->sendRequest($page);

            if (isset($response[$this->content]) and is_array($response[$this->content]) and !empty($response[$this->content]) ) {
                foreach ($response[$this->content] as $value) {
                    $result[] = $value;
                }
            } else {
                return $result;
            }

            if(
                !isset($response['_meta']['pageCount']) or
                empty($response['_meta']['pageCount']) or
                $response['_meta']['pageCount'] === $page
            ) {
                break;
            }

            unset($response);
            $page++;
        }

        return $result;
    }

    public function getBody()
    {
        return $this->isRaw ? json_encode($this->params) : json_encode(['filter' => $this->params]) ;
    }

    private function sendRequest($page = 1)
    {
        $curl = new curl\Curl();
        $curl->setHeader('Content-Type', 'application/json; charset=UTF-8');

        $params = [$this->perPageParam => $this->perPage, $this->pageParam => $page];
        if (!empty($this->sort))
        {
            $params['sort'] = $this->sort;
        }
        if($this->method === 'POST')
        {
            $curl->setGetParams($params);
            if(!empty($this->params))
            {
                $curl->setRequestBody($this->getBody());
            }
            $response = $curl->post($this->url,false);
        }
        elseif($this->method === 'GET') {
            $curl->setGetParams(array_merge($params, ['filter' => $this->params]));
            $response = $curl->get($this->url,false);
        } else {
            throw new Exception('Метод '.$this->method.' не поддерживается');
        }

        switch ($curl->responseCode) {
            case 'timeout':
                throw new Exception('Network timeout');
                break;
            case 200:
                return $response;
                break;
            case 404:
                throw new Exception('404. Page not found '. $this->url . ' ' . $this->getBody());
                break;
            case 403:
                throw new Exception('403. Access deny '. $this->url . ' ' . $this->getBody());
                break;
            case 401:
                throw new Exception('401. Autorization required '. $this->url . ' ' . $this->getBody());
                break;
            case 400:
                throw new Exception('400. Bad request '. $this->url . ' ' . $this->getBody());
                break;
            case 500:
                throw new Exception('500. Internal server error '. $this->url . ' ' . $this->getBody());
                break;
            case 503:
                throw new Exception('503. Service unavailable '. $this->url . ' ' . $this->getBody());
                break;
            case 502:
                throw new Exception('502. Bad gateway '. $this->url . ' ' . $this->getBody());
                break;
        }
    }
    public function setSort($str)
    {
        $this->sort = $str;
    }
}