<?php
Class Database{
    //Maakt verbinding met de database en returnt pdo opbject
    static function connectToDB(){
        //Defineer vars
        $sql_server = "localhost";
        $sql_username = "root";
        $sql_password = "kankerlow";
        $sql_database = "webforum";
        $dsn = "mysql:host=$sql_server;dbname=$sql_database";
        //Maak verbinding
        $con = new PDO($dsn, $sql_username, $sql_password);
        return $con;
    }
    //Controleert of het email adres al in de database voorkomt. Returnt true indien wel.
    static function checkUsedEmail($email){
        //Verbind met de database
        $con = Database::connectToDB();
        //Bereid query voor
        $query = $con->prepare("SELECT * FROM users where email = :email");
        //Bind parameters
        $query->bindParam(':email', $email, PDO::PARAM_STR, 256);
        //Voer de query uit
        $query->execute();
        //Check de hoeveelheid rijen die de database returnt.
        if($query->rowCount() == 0){
            //Email adres is niet in gebruik, return false
            return false;
        }
        else{
            //Email is al in gebruik of komt meer dan een keer voor. Beide gevallen zijn een probleem dus return true.
            return true;
        }
    }
    //Controleert of de gebruikersnaam al in de database voorkomt. Returnt true indien wel.
    static function checkUsedUsername($username){
        $con = Database::connectToDB();
        //Bereid query voor
        $query = $con->prepare("SELECT * FROM users where username = :username");
        //Bind parameters
        $query->bindParam(':username', $username, PDO::PARAM_STR, 256);
        //Voer de query uit
        $query->execute();
        //Check de hoeveelheid rijen die de database returnt.
        if($query->rowCount() == 0){
            //Username adres is niet in gebruik, return false
            return false;
        }
        else{
            //Username is al in gebruik of komt meer dan een keer voor. Beide gevallen zijn een probleem dus return true.
            return true;
        }
    }
    //Registreert een gebruiker. Neemt als invoer email, wachtwoord, gebruikersnaam. en email activation key. Nog niet volledig geimplementeerd
    static function registerUser($email, $password, $username){
        $ip = $_SERVER['REMOTE_ADDR'];
        //Initit db connection
        $con = Database::connectToDB();
        //Bereid query voor
        $query = $con->prepare("INSERT INTO users (username, email, password, reg_ip) VALUES (:username, :email, :password, :ip)");
        //Bind parameters
        $query->bindParam(':username', $username, PDO::PARAM_STR, 256);
        $query->bindParam(':email', $email, PDO::PARAM_STR, 256);
        $query->bindParam(':password', $password, PDO::PARAM_STR, 256);
        $query->bindParam(':ip', $ip, PDO::PARAM_STR, 256);
        //Voer query uit
        $query->execute();
    }
    //Check of gegeven login info in de database voorkomt
    static function isLoginValid($email, $password){
        //Init db connection
        $con = Database::connectToDB();
        //Bereid query voor
        $query = $con->prepare("SELECT * FROM users where email = :email AND password = :password");
        //Bind params
        $query->bindParam(':email', $email, PDO::PARAM_STR, 256);
        $query->bindParam(':password', $password, PDO::PARAM_STR, 256);
        //Voer query it
        $query->execute();
        //Check hoeveelheid teruggestuurde rijen
        if($query->rowCount() == 1){
            //login correct (komt voor in de db)
            return true;
        }
        else{
            //Incorrect
            return false;
        }
    }
    //Vraag gebruikers ID op doormiddel van email en pass
    static function getUID($email, $password){
        //Init db connection
        $con = Database::connectToDB();
        //Bereid query voor
        $query = $con->prepare("SELECT id FROM users where email = :email AND password = :password");
        //Bind params
        $query->bindParam(':email', $email, PDO::PARAM_STR, 256);
        $query->bindParam(':password', $password, PDO::PARAM_STR, 256);
        //Voer query it
        $query->execute();
        //Check hoeveelheid teruggestuurde rijen
        if($query->rowCount() == 1){
            //login correct, return uid
            $result = $query->fetch(PDO::FETCH_COLUMN);
            return $result;
        }
        else{
            //something went wrong, return -1
            return -1;
        }
    }
    static function getUsername($uid){
        $con = Database::connectToDB();
        $query = $con->prepare("SELECT username FROM users where id = :uid");
        $query->bindParam(':uid', $uid, PDO::PARAM_STR, 256);
        $query->execute();
        if($query->rowCount() == 1){
            //login correct, return uid
            $result = $query->fetch(PDO::FETCH_COLUMN);
            return $result;
        }
        else{
            //something went wrong, return -1
            return "db_user_invalid";
        }
    }

    /***
     *      ______ __  __          _____ _                 _____ _______ _______      __  _______ _____ ____  _   _ 
     *     |  ____|  \/  |   /\   |_   _| |          /\   / ____|__   __|_   _\ \    / /\|__   __|_   _/ __ \| \ | |
     *     | |__  | \  / |  /  \    | | | |         /  \ | |       | |    | |  \ \  / /  \  | |    | || |  | |  \| |
     *     |  __| | |\/| | / /\ \   | | | |        / /\ \| |       | |    | |   \ \/ / /\ \ | |    | || |  | | . ` |
     *     | |____| |  | |/ ____ \ _| |_| |____   / ____ \ |____   | |   _| |_   \  / ____ \| |   _| || |__| | |\  |
     *     |______|_|  |_/_/    \_\_____|______| /_/    \_\_____|  |_|  |_____|   \/_/    \_\_|  |_____\____/|_| \_|
     *                                                                                                              
     *                                                                                                              
    ***/

    //Kijk of de user activation key al bestaat in de databse.
    static function doesUserActivationKeyExist($activationKey){
        $con = Database::connectToDB();
        $query = $con->prepare("SELECT * FROM email_activation_keys WHERE activationkey = :activationKey");
        $query->bindParam(':activationKey', $activationKey, PDO::PARAM_STR, 256);        
        $query->execute();
        if($query->rowCount() == 0){
            //bestaat nog niet
            return false;
        }
        else{
            //bestaat al
            return true;
        }
    }
    static function registerActivationKey($users_id, $activationKey){
        $con = Database::connectToDB();
        $query = $con->prepare("INSERT INTO email_activation_keys (users_id, activationkey) VALUES (:users_id, :activationkey)");
        $query->bindParam(':users_id', $users_id);
        $query->bindParam(':activationkey', $activationKey);
        $query->execute();
    }


    //Activeer gebruiker en verwijder activation key uit de activation key tabel
    static function activateUser($activationKey){
        $con = Database::connectToDb();
        $query = $con->prepare("SELECT users_id FROM email_activation_keys WHERE activationKey = :activationKey");
        $query->bindParam('activationKey', $activationKey);
        $query->execute();
        $result = -1;
        if($query->rowCount() == 1){
            //login correct, return uid
            $result = $query->fetch(PDO::FETCH_COLUMN);
        }
        else{
            //activation key komt niet voor in de db, return -1
            return -1;
        }
        $id = $result;
        $query = null;
        $query = $con->prepare("UPDATE users SET active = 1 WHERE id = :id and active = 0");
        $query->bindParam(':id',$id,PDO::PARAM_INT);
        $query->execute();
    }

  /***
    *       _____ ______  _____ _____ _____ ____  _   _   _______ ____  _  ________ _   _  _____ 
    *      / ____|  ____|/ ____/ ____|_   _/ __ \| \ | | |__   __/ __ \| |/ /  ____| \ | |/ ____|
    *     | (___ | |__  | (___| (___   | || |  | |  \| |    | | | |  | | ' /| |__  |  \| | (___  
    *      \___ \|  __|  \___ \\___ \  | || |  | | . ` |    | | | |  | |  < |  __| | . ` |\___ \ 
    *      ____) | |____ ____) |___) |_| || |__| | |\  |    | | | |__| | . \| |____| |\  |____) |
    *     |_____/|______|_____/_____/|_____\____/|_| \_|    |_|  \____/|_|\_\______|_| \_|_____/ 
    *                                                                                       
   ***/                                                                                           


    static function isSessionTokenInUse($token){
        //Init db connection
        $con = Database::connectToDB();
        //Bereid query voor
        $query = $con->prepare("SELECT * FROM usersessions where token = :token");
        //Bind params
        $query->bindParam(':token', $token, PDO::PARAM_STR, 256);
        //Voer query it
        $query->execute();
        //Check hoeveelheid teruggestuurde rijen
        if($query->rowCount() == 0){
            return false;
        }
        else{
            return true;
        }
    }
    static function registerNewSession($uid, $token, $expires){
        //Init db connection
        $con = Database::connectToDB();
        //Bereid query voor
        $query = $con->prepare("INSERT INTO usersessions (uid, token, expires) VALUES (:uid, :token, :expires)");
        //Bind params
        $query->bindParam(':uid', $uid, PDO::PARAM_INT);
        $query->bindParam(':token', $token, PDO::PARAM_STR, 256);
        $query->bindParam(':expires', $expires, PDO::PARAM_STR);
        //Voer query it
        $query->execute();
    }
    static function isSessionValid($token, $uid){
        //Init db connection
        $con = Database::connectToDB();
        //Bereid query voor
        $query = $con->prepare("SELECT * FROM usersessions where token = :token AND uid = :uid AND expires > NOW()");
        //Bind params
        $query->bindParam(':token', $token, PDO::PARAM_STR, 256);
        $query->bindParam(':uid', $uid, PDO::PARAM_STR, 256);
        //Voer query it
        $query->execute();
        //Check hoeveelheid teruggestuurde rijen
        if($query->rowCount() == 1){
            echo('session valid in db<br>');
            return true;
        }
        else{
            return false;
        }
    }
    static function invalidateSession($token){
        echo("hek");
        //Init db connection
        $con = Database::connectToDB();
        //Bereid query voor
        $query = $con->prepare("DELETE FROM usersessions WHERE token = :token");
        //Bind params
        $query->bindParam(':token', $token, PDO::PARAM_STR, 256);
        //Voer query it
        $query->execute();
    }
    static function invalidateSessionByUID($uid){
        //Init db connection
        $con = Database::connectToDB();
        //Bereid query voor
        $query = $con->prepare("DELETE FROM usersessions WHERE uid = :uid");
        //Bind params
        $query->bindParam(':token', $uid, PDO::PARAM_INT);
        //Voer query it
        $query->execute();
    }
    static function deleteExpiredSessions(){
        $con = Database::connectToDB();
        //Bereid query voor
        $query = $con->prepare("DELETE FROM usersessions WHERE expires < NOW()");
        $query->execute();
    }
    static function getSessionExpiryDate($token){
        $con = Database::connectToDB();
        $query = $con->prepare("SELECT expires FROM usersessions where token = :token");
        $query->bindParam(':token', $token, PDO::PARAM_STR, 256);
        $query->execute();
        if($query->rowCount() == 1){
            //login correct, return uid
            $result = $query->fetch(PDO::FETCH_COLUMN);
            return $result;
        }
        else{
            //something went wrong, return an invalid date.
            return "2000-01-01 00:00:00";
        }
    }
}
?>