<?php
    abstract class EngineRequest {
        function __construct($opts, $mh) {
            $this->query = $opts->query;
            $this->page = $opts->page;
            $this->opts = $opts;

            $url = $this->get_request_url();
            if ($url) {
                $this->ch = curl_init($url);
                curl_setopt_array($this->ch, $opts->curl_settings);
                curl_multi_add_handle($mh, $this->ch);
            }
        }

        public function get_request_url(){
            return "";
        }

        public function successful() {
            return curl_getinfo($this->ch)['http_code'] == '200';
        }

        abstract function get_results();
        static public function print_results($results){}
    }

    function load_opts() {
        $opts = require "config.php";

        $opts->query = trim($_REQUEST["q"] ?? "");
        $opts->type = (int) ($_REQUEST["t"] ?? 0);
        $opts->page = (int) ($_REQUEST["p"] ?? 0);

        $opts->theme = trim(htmlspecialchars($_COOKIE["theme"] ?? "dark"));
        $opts->safe_search = isset($_COOKIE["safe_search"]);
        $opts->disable_special = isset($_COOKIE["disable_special"]);
        $opts->disable_frontends = isset($_COOKIE["disable_frontends"]);

        $opts->language ??= trim(htmlspecialchars($_COOKIE["language"]));
        $opts->number_of_results ??= trim(htmlspecialchars($_COOKIE["number_of_results"]));

        foreach (array_keys($opts->frontends ?? array()) as $frontend) {
            $opts->frontends[$frontend]["instance_url"] = $_COOKIE[$frontend] ?? "";
        }

        echo "<pre>";
        echo "</pre>";

        return $opts;
    }

    function init_search($opts, $mh) {
        switch ($opts->type)
        {
            case 1:
                require "engines/qwant/image.php";
                return new QwantImageSearch($opts, $mh);

            case 2:
                require "engines/invidious/video.php";
                return new VideoSearch($opts, $mh);

            case 3:
                if ($opts->disable_bittorent_search) {
                    echo "<p class=\"text-result-container\">The host disabled this feature! :C</p>";
                    break;
                }

                require "engines/bittorrent/merge.php";
                return new TorrentSearch($opts, $mh);

            case 4:
                if ($opts->disable_hidden_service_search) {
                    echo "<p class=\"text-result-container\">The host disabled this feature! :C</p>";
                    break;
                }
                require "engines/ahmia/hidden_service.php";
                return new TorSearch($opts, $mh);

            default:
                require "engines/text/text.php";
                return new TextSearch($opts, $mh);
        }
    }

    function fetch_search_results($opts, $do_print) {
        $start_time = microtime(true);
        $mh = curl_multi_init();
        $search_category = init_search($opts, $mh);

        $running = null;

        do {
            curl_multi_exec($mh, $running);
        } while ($running);

        $results = $search_category->get_results();

        // TODO test if no results here and fallback

        if (!$do_print)
            return $results;

        print_elapsed_time($start_time);
        $search_category->print_results($results);

        return $results;
    }
?>