<?php
namespace YTKNS;

final class ZoneRedirect {
    public function __construct() {
    }

    public static function exists(string $subdomain): bool {
        $check = DB::prepare('
            SELECT COUNT(`redirect_name`) > 0
            FROM `ytkns_redirects`
            WHERE `redirect_name` = :subdomain
        ');
        $check->bindValue('subdomain', $subdomain);
        return $check->execute() ? (bool)$check->fetchColumn() : true;
    }

    public static function find(string $subdomain): ?ZoneRedirect {
        $find = DB::prepare('
            SELECT `redirect_name`, `redirect_target`
            FROM `ytkns_redirects`
            WHERE `redirect_name` = :subdomain
        ');
        $find->bindValue('subdomain', $subdomain);
        $redirect = $find->execute() ? $find->fetchObject(self::class) : false;
        return $redirect ? $redirect : null;
    }

    public static function create(string $subdomain, string $target): void {
        $create = DB::prepare('
            REPLACE INTO `ytkns_redirects` (
                `redirect_name`, `redirect_target`
            ) VALUES (
                :name, :target
            )
        ');
        $create->bindValue('name', $subdomain);
        $create->bindValue('target', $target);
        $create->execute();
    }

    public function execute(): void {
        http_response_code(301);
        header(sprintf('Location: %s', $this->redirect_target));
    }
}