<?php
    class GoogleRequest extends EngineRequest {
        public function get_request_url() {

            $query_encoded = str_replace("%22", "\"", urlencode($this->query));
            $results = array();

            $domain = $this->opts->google_domain;
            $results_language = $this->opts->language;
            $number_of_results = $this->opts->number_of_results;

            $url = "https://www.google.$domain/search?q=$query_encoded&nfpr=1&start=$this->page";

            if (3 > strlen($results_language) && 0 < strlen($results_language)) {
                $url .= "&lr=lang_$results_language";
                $url .= "&hl=$results_language";
            }

            if (3 > strlen($number_of_results) && 0 < strlen($number_of_results))
                $url .= "&num=$number_of_results";

            if (isset($_COOKIE["safe_search"]))
                $url .= "&safe=medium";

            return $url;
        }


        public function parse_results($response) {
            $results = array();
            $xpath = get_xpath($response);

            if (!$xpath)
                return $results;

            $didyoumean = $xpath->query(".//a[@class='gL9Hy']")[0];

            if (!is_null($didyoumean))
                array_push($results, array(
                    "did_you_mean" => $didyoumean->textContent
                ));

            foreach($xpath->query("//div[@id='search']//div[contains(@class, 'g')]") as $result) {
                $url = $xpath->evaluate(".//div[@class='yuRUbf']//a/@href", $result)[0];

                if ($url == null)
                    continue;

                if (!empty($results)) // filter duplicate results, ignore special result
                {
                    if (end($results)["url"] == $url->textContent)
                        continue;
                }

                $url = $url->textContent;

                $title = $xpath->evaluate(".//h3", $result)[0];
                $description = $xpath->evaluate(".//div[contains(@class, 'VwiC3b')]", $result)[0];

                array_push($results,
                    array (
                        "title" => htmlspecialchars($title->textContent),
                        "url" =>  htmlspecialchars($url),
                        // base_url is to be removed in the future, see #47
                        "base_url" => htmlspecialchars(get_base_url($url)),
                        "description" =>  $description == null ?
                                          "No description was provided for this site." :
                                          htmlspecialchars($description->textContent)
                    )
                );
            }

            if (empty($results) && !str_contains($response, "Our systems have detected unusual traffic from your computer network.")) {
                $results["error"] = array(
                    "message" => "There are no results. Please try different keywords!"
                );
            }

            return $results;
        }
    }
?>