<?php 

    class DPTW{

        private static $default_settings = [
            "dictionary_urls" => "https://inciclopedia.org/wiki/Frikipedia", 
            "request_root" => "/api"
        ];
        private $inputs = [];
        private $request_variables = [];

        public $dictionary;

        public function __construct($inputs = null){

            is_array($inputs) && ($this->inputs = $inputs);

            class_exists('\DPTW\Dictionary') && ($this->dictionary = new \DPTW\Dictionary($this));
            class_exists('\DPTW\MySQL') && ($this->mysql = new \DPTW\MySQL($this));

            $route = substr($_SERVER["REQUEST_URI"], strlen($this->settings("request_root")));
            ($uri_variables_i = strpos($route, "?")) && ($route = substr($route, 0, $uri_variables_i));

            isset(($_GET["v"])) && ($this->request_variables = json_decode(base64_decode($_GET["v"]), true));

            switch($route){
                case "/dictionary/update":
                    $this->dictionary->update();
                break;
                case "/sessions/update":
                    $this->session_update(true);
                break;
                case "/scores/set":
                    $this->set_score();
                break;
                case "/test/1":
                    $this->test_1();
                break;
                case "/scores/list":
                    $this->list_scores();
                break;
                default:
                    self::response(404, "unknown_route");
                break;
            };

        }

        public function request($key){
            return isset($this->request_variables[$key]) ? $this->request_variables[$key] : null;
        }

        private static function save_file($path, $data){

            $directory = "";
            $slash = strpos($path, "/") ? "/" : "\\";

            if(preg_match('/^[a-z]\:/', $path)){
                $directory = substr($path, 0, 2);
                $path = substr($path, 2);
            };

            $directory = preg_replace('/^(.+)[\/\\\\][^\/\\\\]+$/', "$1", $path);
            !file_exists($directory) && mkdir($directory, 0777, true);

            file_put_contents($path, $data);

        }

        public function settings($keys, $inputs = null){

            if(is_string($keys))
                $keys = [$keys];
            elseif(!is_array($keys))
                $keys = [];

            foreach([$inputs, $this->inputs, \DPTW\Secrets::settings, self::$default_settings] as $subinputs)
                if(is_array($subinputs))
                    foreach($keys as $key)
                        if(isset($subinputs[$key]))
                            return $subinputs[$key];
            return null;
        }

        public static function string_variables($string, $variables){
            return preg_replace_callback('/\{([^\{\}]+)\}/', function($values) use($variables){
                return isset($variables[$values[1]]) ? $variables[$values[1]] : $values[0];
            }, $string);
        }

        public static function get_ip(){
            foreach(["HTTP_X_REAL_IP", "HTTP_CLIENT_IP", "HTTP_X_FORWARDED_FOR", "REMOTE_ADDR"] as $key){
                if(!empty($_SERVER[$key]))
                    return explode(",", $_SERVER[$key])[0];
                if($ips = getenv($key))
                    return explode(",", $ips)[0];
            };
            return null;
        }
        
        public function session_get(){
            return isset($_SESSION["dptw_session_id"]) ? $_SESSION["dptw_session_id"] : null;
        }

        public static function response($code, $data){

            header("content-type: application/json");
            echo json_encode([
                "ok" => true, 
                "code" => $code, 
                "content" => $data
            ]);

        }

        private function session_update($response = false){

            $results = $this->mysql->query("call sessions_update({session}, @error, @id);");
            $data = [
                "error" => $results[0]["variables"]["error"], 
                "id" => $results[0]["variables"]["id"]
            ];

            if(!isset($_SESSION["dptw_session_id"]) || $_SESSION["dptw_session_id"] != $results[0]["variables"]["id"])
                $_SESSION["dptw_session_id"] = $results[0]["variables"]["id"];

            $response && $this->response(200, $data);

            return [$data["id"], $data["error"]];
        }

        private function test_1(){

            self::response(200, base64_encode(json_encode([
                "mode" => "testing_game", 
                "page" => 1, 
                "items_per_page" => 20, 
                "nicks" => ""
            ])));

        }

        private function set_score(){

            list($session_id, $error) = $this->session_update();
            $id = null;

            if(!$error){

                $results = $this->mysql->query("call scores_set({session}, '{mode}', '{nick}', {score}, @error, @id);", [
                    "mode" => $this->request("mode"), 
                    "nick" => $this->request("nick"), 
                    "score" => $this->request("score")
                ]);

                $error |= $results[0]["variables"]["error"];
                $id = $results[0]["variables"]["id"];

            };

            self::response(200, [
                "error" => $error, 
                "id" => $id
            ]);

            return [$id, $error];
        }

        private function list_scores(){

            list($session_id, $error) = $this->session_update();
            $pages = null;
            $items = null;
            $scores = null;

            if(!$error){

                $results = $this->mysql->query("call scores_list({session}, '{mode}', {page}, {items_per_page}, '{nicks}', @error, @pages, @items);", [
                    "mode" => $this->request("mode"), 
                    "page" => $this->request("page"), 
                    "items_per_page" => $this->request("items_per_page"), 
                    "nicks" => $this->request("nicks")
                ]);

                $error |= $results[0]["variables"]["error"];
                $pages = $results[0]["variables"]["pages"];
                $items = $results[0]["variables"]["items"];
                $scores = $results[0]["tables"][0];

            };

            self::response(200, [
                "error" => $error, 
                "pages" => $pages, 
                "items" => $items, 
                "scores" => $scores
            ]);

            return [$pages, $items, $scores, $error];
        }

    };