<?php declare(strict_types=1);
namespace openvk\Web\Presenters;
use Chandler\Signaling\SignalManager;
use Chandler\MVC\SimplePresenter;
use Chandler\Session\Session;
use Chandler\Security\Authenticator;
use Latte\Engine as TemplatingEngine;
use openvk\Web\Models\Entities\IP;
use openvk\Web\Themes\Themepacks;
use openvk\Web\Models\Repositories\{IPs, Users, APITokens, Tickets};

abstract class OpenVKPresenter extends SimplePresenter
{
    protected $banTolerant   = false;
    protected $errorTemplate = "@error";
    protected $user = NULL;
    
    private function calculateQueryString(array $data): string
    {
        $rawUrl = "tcp+stratum://fakeurl.net$_SERVER[REQUEST_URI]"; #HTTP_HOST can be tainted
        $url    = (object) parse_url($rawUrl);
        $path   = $url->path;
        
        return "$path?" . http_build_query(array_merge($_GET, $data));
    }
    
    protected function flash(string $type, string $title, ?string $message = NULL, ?int $code = NULL): void
    {
        Session::i()->set("_error", json_encode([
            "type"  => $type,
            "title" => $title,
            "msg"   => $message,
            "code"  => $code,
        ]));
    }

    protected function setTempTheme(string $theme): void
    {
        Session::i()->set("_tempTheme", $theme);
    }
    
    protected function flashFail(string $type, string $title, ?string $message = NULL, ?int $code = NULL, bool $json = false): void
    {
        if($json) {
            $this->returnJson([
                "success" => $type !== "err",
                "flash" => [
                    "type"    => $type,
                    "title"   => $title,
                    "message" => $message,
                    "code"    => $code,
                ],
            ]);
        } else {
            $this->flash($type, $title, $message, $code);
            $referer = $_SERVER["HTTP_REFERER"] ?? "/";
            
            header("HTTP/1.1 302 Found");
            header("Location: $referer");
            exit;
        }
    }
    
    protected function logInUserWithToken(): void
    {
        $header = $_SERVER["HTTP_AUTHORIZATION"] ?? "";
        $token;
        
        preg_match("%Bearer (.*)$%", $header, $matches);
        $token = $matches[1] ?? "";
        $token = (new APITokens)->getByCode($token);
        if(!$token) {
            header("HTTP/1.1 401 Unauthorized");
            header("Content-Type: application/json");
            exit(json_encode(["error" => "The access token is invalid"]));
        }
        
        $this->user                  = (object) [];
        $this->user->identity        = $token->getUser();
        $this->user->raw             = $this->user->identity->getChandlerUser();
        $this->user->id              = $this->user->identity->getId();
        $this->template->thisUser    = $this->user->identity;
        $this->template->userTainted = false;
    }
    
    protected function assertUserLoggedIn(bool $returnUrl = true): void
    {
        if(is_null($this->user)) {
            $loginUrl = "/login";
            if($returnUrl && $_SERVER["REQUEST_METHOD"] === "GET") {
                $currentUrl = function_exists("get_current_url") ? get_current_url() : $_SERVER["REQUEST_URI"];
                $loginUrl  .= "?jReturnTo=" . rawurlencode($currentUrl);
            }
            
            $this->flash("err", tr("login_required_error"), tr("login_required_error_comment"));
            header("HTTP/1.1 302 Found");
            header("Location: $loginUrl");
            exit;
        }
    }
    
    protected function hasPermission(string $model, string $action, int $context): bool
    {
        if(is_null($this->user)) {
            if($model !== "user") {
                $this->flash("info", tr("login_required_error"), tr("login_required_error_comment"));
                
                header("HTTP/1.1 302 Found");
                header("Location: /login");
                exit;
            }
            
            return ($action === "register" || $action === "login");
        }
        
        return (bool) $this->user->raw->can($action)->model($model)->whichBelongsTo($context === -1 ? null : $context);
    }
    
    protected function assertPermission(string $model, string $action, int $context, bool $throw = false): void
    {
        if($this->hasPermission($model, $action, $context)) return;
        
        if($throw)
            throw new SecurityPolicyViolationException("Permission error");
        else
            $this->flashFail("err", tr("not_enough_permissions"), tr("not_enough_permissions_comment"));
    }
    
    protected function assertCaptchaCheckPassed(): void
    {
        if(!check_captcha())
            $this->flashFail("err", tr("captcha_error"), tr("captcha_error_comment"));
    }
    
    protected function willExecuteWriteAction(bool $json = false): void
    {
        $ip  = (new IPs)->get(CONNECTING_IP);
        $res = $ip->rateLimit();
        
        if(!($res === IP::RL_RESET || $res === IP::RL_CANEXEC)) {
            if($res === IP::RL_BANNED && OPENVK_ROOT_CONF["openvk"]["preferences"]["security"]["rateLimits"]["autoban"]) {
                $this->user->identity->ban("Account has possibly been stolen", false);
                exit("Хакеры? Интересно...");
            }
            
            $this->flashFail("err", tr("rate_limit_error"), tr("rate_limit_error_comment", OPENVK_ROOT_CONF["openvk"]["appearance"]["name"], $res), NULL, $json);
        }
    }
    
    protected function signal(object $event): bool
    {
        return (SignalManager::i())->triggerEvent($event, $this->user->id);
    }
    
    protected function logEvent(string $type, array $data): bool
    {
        $db = eventdb();
        if(!$db)
            return false;
        
        $data = array_merge([
            "timestamp" => time(),
            "verified"  => (int) true,
        ], $data);
        $columns = implode(", ", array_map(function($col) {
            return "`" . addslashes($col) . "`";
        }, array_keys($data)));
        $values  = implode(", ", array_map(function($val) {
            return "'" . addslashes((string) (int) $val) . "'";
        }, array_values($data)));
        
        $db->getConnection()->query("INSERT INTO " . $type . "s($columns) VALUES ($values);");
        
        return true;
    }
    
    /**
     * @override
     */
    protected function sendmail(string $to, string $template, array $params = []): void
    {
        parent::sendmail($to, __DIR__ . "/../../Email/$template", $params);
    }
    
    function getTemplatingEngine(): TemplatingEngine
    {
        $latte = parent::getTemplatingEngine();
        $latte->addFilter("translate", function($s) {
            return tr($s);
        });
        
        return $latte;
    }
    
    function onStartup(): void
    {
        $user = Authenticator::i()->getUser();
        
        $this->template->isXmas = intval(date('d')) >= 1 && date('m') == 12 || intval(date('d')) <= 15 && date('m') == 1 ? true : false;
        
        if(!is_null($user)) {
            $this->user = (object) [];
            $this->user->raw             = $user;
            $this->user->identity        = (new Users)->getByChandlerUser($user);
            $this->user->id              = $this->user->identity->getId();
            $this->template->thisUser    = $this->user->identity;
            $this->template->userTainted = $user->isTainted();
            
            if($this->user->identity->isBanned() && !$this->banTolerant) {
                header("HTTP/1.1 403 Forbidden");
                $this->getTemplatingEngine()->render(__DIR__ . "/templates/@banned.xml", [
                    "thisUser" => $this->user->identity,
                    "csrfToken" => $GLOBALS["csrfToken"],
                ]);
                exit;
            }
            
            if ($this->user->identity->onlineStatus() == 0) {
                $this->user->identity->setOnline(time());
                $this->user->identity->save();
            }
            
            $this->template->ticketAnsweredCount = (new Tickets)->getTicketsCountByuId($this->user->id, 1);
            if($user->can("write")->model("openvk\Web\Models\Entities\TicketReply")->whichBelongsTo(0))
                $this->template->helpdeskTicketNotAnsweredCount = (new Tickets)->getTicketCount(0);
        }
        
        setlocale(LC_TIME, ...(explode(";", tr("__locale"))));
        
        parent::onStartup();
    }
    
    function onBeforeRender(): void
    {
        parent::onBeforeRender();
        
        $theme = NULL;
        if(Session::i()->get("_tempTheme")) {
            $theme = Themepacks::i()[Session::i()->get("_tempTheme", "ovk")];
            Session::i()->set("_tempTheme", NULL);
        } else if($this->requestParam("themePreview")) {
            $theme = Themepacks::i()[$this->requestParam("themePreview")];
        } else if($this->user->identity !== null && $this->user->identity->getTheme()) {
            $theme = $this->user->identity->getTheme();
        }
        
        $this->template->theme = $theme;
        if(!is_null($theme) && $theme->overridesTemplates())                                                                                                   
            $this->template->_templatePath = $theme->getBaseDir() . "/tpl";
        
        if(!is_null(Session::i()->get("_error"))) {
            $this->template->flashMessage = json_decode(Session::i()->get("_error"));
            Session::i()->set("_error", NULL);
        }
    }

    protected function returnJson(array $json): void
    {
        $payload = json_encode($json, JSON_UNESCAPED_UNICODE);
        $size = strlen($payload);
        header("Content-Type: application/json");
        header("Content-Length: $size");
        exit($payload);
    }

    /* ActivityPub quicks :DDD */

    function isActivityPubClient(): bool
    {
        $accept = explode(";", $_SERVER['HTTP_ACCEPT']);
        return (bool) preg_match("/(application\/(ld\+json|activity\+json))/", $accept[0]);
    }

    function getPersonContext()
    {
        // Sometimes i being lazy...
        return json_decode('[
            "https://www.w3.org/ns/activitystreams",
            {
              "sm": "http://smithereen.software/ns#",
              "wall": {
                "@id": "sm:wall",
                "@type": "@id"
              },
              "sc": "http://schema.org#",
              "firstName": "sc:givenName",
              "lastName": "sc:familyName",
              "middleName": "sc:additionalName",
              "gender": {
                "@id": "sc:gender",
                "@type": "sc:GenderType"
              },
              "supportsFriendRequests": "sm:supportsFriendRequests",
              "maidenName": "sm:maidenName",
              "friends": {
                "@id": "sm:friends",
                "@type": "@id"
              },
              "groups": {
                "@id": "sm:groups",
                "@type": "@id"
              },
              "vcard": "http://www.w3.org/2006/vcard/ns#"
            },
            "https://w3id.org/security/v1"
          ]');
        // Гришк)
    }

    /**
     * @param private If true, it will return the private key. Otherwise, it will return the public key.
     */
    function getKey(bool $private = false)
    {
        if(!file_exists(OPENVK_ROOT . ($private ? "/data/private.pem" : "/data/public.pem")))
            throw new ISE("private.pem and public.pem files are missing. Please, check 10th step for a installation guide in README file.");
        
        $key = file(OPENVK_ROOT . ($private ? "/data/private.pem" : "/data/public.pem"));
        $key[0] = null;
        $key[count($key)-1] = null;
        return "-----BEGIN PUBLIC KEY-----\n" . str_replace("\n", '', implode('', $key)) . "\n-----END PUBLIC KEY-----\n";
    }
}