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register.class.php

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<?php 
class Register{
    private $username;
    private $raw_password;
    private $enc_password;
    public $error;
    public $success;
    private $storage = "data.json";
    private $stored_users;
    private $new_user;

    public function __construct($username, $password){
        $this->username = trim($username);
        $this->username = filter_var($this->username, FILTER_SANITIZE_STRING);

        $this->raw_password = filter_var(trim($password), FILTER_SANITIZE_STRING);
        $this->enc_password = password_hash($this->raw_password, PASSWORD_DEFAULT);

        $this->stored_users = json_decode(file_get_contents($this->storage), true);

        $this->new_user = [
            "username" => $this->username,
            "password" => $this->enc_password,
            "balance" => array(),
        ];

        if($this->checkFieldValues()){
            $this->insertUser();
        }
    }

    public function checkFieldValues(){
        if(empty($this->username) || empty($this->raw_password)){
            $this->error = "Bägge fälten behöver fyllas i";

            return false;
        }else{
            return true;
        }
    }

    private function usernameExists(){
        foreach($this->stored_users as $user){
            if($this->username == $user["username"]){
                $this->error = "Användarnamnet finns redan, var god välj ett annat.";
                return true;
            }
        }
        return false;
    }

    private function insertUser(){
        if($this->usernameExists() == FALSE){
            array_push($this->stored_users, $this->new_user);
            if(file_put_contents($this->storage, json_encode($this->stored_users, JSON_PRETTY_PRINT))){
                return $this->success = "Kontot har skapats.";
            }else{
                return $this->error = "Något gick åt helvete. Försök igen.";
            }
        }
    }
}
?>