<?php
    class Register {
        private $username;
        private $password;
        private $conn;
        public $error;

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

        public function checkUsername() {
            switch(true) {
                case empty($this->username):
                    $this->error = "Please fill out all of the fields";
                    break;
                case preg_match("/[^a-z0-9 ]/i", $this->username):
                    $this->error = "Username cannot have any special characters.";
                    break;
                case strlen($this->username) > 16:
                    $this->error = "Username cannot be longer than 16 characters.";
                    break;
                case strlen($this->username) < 3:
                    $this->error = "Your username cannot be shorter than 3 characters.";
                    break;
                default:
                    $stmt = $this->conn->prepare("SELECT username FROM accounts WHERE username = :username");
                    $stmt->bindParam(":username", $this->username);
                    $stmt->execute();

                    if ($stmt->rowCount() > 0)
                        $this->error = "Username has been already taken.";
            }

            return $this->error;
        }

        public function checkPassword($passwordConfirm) {
            if (empty($this->password)) {
                $this->error = "Please fill out all of the fields.";
            } else {
                if ($this->password != $passwordConfirm)
                    $this->error = "Passwords don't match.";
            }

            return $this->error;
        }

        public function insertUser() {
            $hashed_password = password_hash($this->password, PASSWORD_BCRYPT);
            
            $stmt = $this->conn->prepare("INSERT INTO accounts (username, password) VALUES (:username, :password)");
            $stmt->bindParam(":username", $this->username);
            $stmt->bindParam(":password", $hashed_password);
            $stmt->execute();

            session_regenerate_id(true);
            $_SESSION["user"] = $this->username;
            return true;
        }
    }
?>