<?php
/**
 * Plumrocket Inc.
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the End-user License Agreement
 * that is available through the world-wide-web at this URL:
 * http://wiki.plumrocket.net/wiki/EULA
 * If you are unable to obtain it through the world-wide-web, please
 * send an email to support@plumrocket.com so we can send you a copy immediately.
 *
 * @package     Plumrocket_GeoIPLookup
 * @copyright   Copyright (c) 2018 Plumrocket Inc. (http://www.plumrocket.com)
 * @license     http://wiki.plumrocket.net/wiki/EULA  End-user License Agreement
 */

namespace Plumrocket\GeoIPLookup\Model\Services;

use Magento\Framework\HTTP\Client\Curl;
use Magento\Framework\HTTP\PhpEnvironment\RemoteAddress;
use Magento\Framework\Serialize\Serializer\Json;
use Plumrocket\GeoIPLookup\Api\GeoIpServiceInterface;
use Plumrocket\GeoIPLookup\Helper\Config;
use Plumrocket\GeoIPLookup\Model\Cache\GeoIpInterface;

/**
 * @since 2.0.0
 */
class IpApi implements GeoIpServiceInterface
{
    /**
     * @var \Magento\Framework\HTTP\Client\Curl
     */
    private $curl;

    /**
     * @var string
     */
    private $dataName = 'Ipapi.Com';

    /**
     * @var \Magento\Framework\HTTP\PhpEnvironment\RemoteAddress
     */
    private $remoteAddress;

    /**
     * @var \Magento\Framework\Serialize\Serializer\Json
     */
    private $jsonSerializer;

    /**
     * @var \Plumrocket\GeoIPLookup\Helper\Config
     */
    private $configHelper;

    /**
     * @var \Plumrocket\GeoIPLookup\Model\Cache\GeoIpInterface
     */
    private $geoIpCache;

    /**
     * @param \Magento\Framework\HTTP\Client\Curl $curl
     * @param \Magento\Framework\HTTP\PhpEnvironment\RemoteAddress $remoteAddress
     * @param \Magento\Framework\Serialize\Serializer\Json $jsonSerializer
     * @param \Plumrocket\GeoIPLookup\Helper\Config $configHelper
     * @param \Plumrocket\GeoIPLookup\Model\Cache\GeoIpInterface $geoIpCache
     */
    public function __construct(
        Curl $curl,
        RemoteAddress $remoteAddress,
        Json $jsonSerializer,
        Config $configHelper,
        GeoIpInterface $geoIpCache
    ) {
        $this->curl = $curl;
        $this->remoteAddress = $remoteAddress;
        $this->jsonSerializer = $jsonSerializer;
        $this->configHelper = $configHelper;
        $this->geoIpCache = $geoIpCache;
    }

    /**
     * @inheritDoc
     */
    public function getGeoLocation(?string $ip): ?array
    {
        $result = null;

        if (! $ip) {
            $ip = $this->remoteAddress->getRemoteAddress();
        }

        if ($ip) {
            $cacheKey = ip2long($ip) . '_gl_ipapi';
            $geoipCache = $this->geoIpCache->get();

            if (isset($geoipCache[$cacheKey])) {
                return $geoipCache[$cacheKey];
            }

            $curlResult = $this->curlExec($ip);

            if ($curlResult) {
                $curlResultArr = $this->jsonSerializer->unserialize($curlResult);

                if (isset($curlResultArr['error'])) {
                    return $result;
                }

                $result = [
                    'country_code'  => $curlResultArr['country_code'] ?? '',
                    'country_name'  => $curlResultArr['country_name'] ?? '',
                    'region_name'  => $curlResultArr['region_name'] ?? '',
                    'city_name'     => $curlResultArr['city'] ?? '',
                    'latitude'      => $curlResultArr['latitude'] ?? '',
                    'longitude'     => $curlResultArr['longitude'] ?? '',
                    'database_name' => $this->dataName
                ];
            }

            $result = (!empty($result)) ? $result : null;
            $geoipCache[$cacheKey] = $result;
            $this->geoIpCache->set($geoipCache);
        }

        return $result;
    }

    /**
     * @inheritDoc
     */
    public function getCountryCode(?string $ip): ?string
    {
        $result = null;
        if (! $ip) {
            $ip = $this->remoteAddress->getRemoteAddress();
        }

        if ($ip) {
            $cacheKey = ip2long($ip) . '_cc_ipapi';
            $geoipCache = $this->geoIpCache->get();
            if (isset($geoipCache[$cacheKey])) {
                return $geoipCache[$cacheKey];
            }

            $curlResult = $this->curlExec($ip);

            if ($curlResult) {
                $curlResultArr = $this->jsonSerializer->unserialize($curlResult);
                if (isset($curlResultArr['error'])) {
                    return $result;
                } else {
                    $result = $curlResultArr['country_code'];
                }
            }

            $result = (!empty($result)) ? $result : null;
            $geoipCache[$cacheKey] = $result;
            $this->geoIpCache->set($geoipCache);
        }

        return $result;
    }

    /**
     * @inheritDoc
     */
    public function getCurrentCountryState(?string $ip): ?string
    {
        $result = null;
        if (! $ip) {
            $ip = $this->remoteAddress->getRemoteAddress();
        }

        if ($ip) {
            $cacheKey = ip2long($ip) . '_cc_ipapi_cstate';
            $geoipCache = $this->geoIpCache->get();

            if (isset($geoipCache[$cacheKey])) {
                return $geoipCache[$cacheKey];
            }

            $curlResult = $this->curlExec($ip);

            if ($curlResult) {
                $curlResultArr = $this->jsonSerializer->unserialize($curlResult);
                if (isset($curlResultArr['error'])) {
                    return $result;
                } else {
                    $result = $curlResultArr['region_name'];
                }
            }

            $result = (!empty($result)) ? $result : null;
            $geoipCache[$cacheKey] = $result;
            $this->geoIpCache->set($geoipCache);
        }

        return $result;
    }

    /**
     * @param $ip
     * @return string
     */
    private function curlExec($ip): string
    {
        $url = $this->configHelper->useIpApiHttps() ? "https://" : "http://";
        $url .= $this->configHelper->getIpApiUrl($ip);
        $options = [
            CURLOPT_HEADER => 0,
            CURLOPT_FRESH_CONNECT => 1,
            CURLOPT_RETURNTRANSFER => 1,
            CURLOPT_FORBID_REUSE => 1,
            CURLOPT_TIMEOUT => 4,
        ];
        $this->curl->post($url, $options);

        return $this->curl->getBody();
    }
}