<?php

 class DB_Functions {
    public $conn;
    // constructor
    function __construct() {
        require_once 'DB_Connect.php';
        // connecting to database
        $db = new DB_Connect();
        $this->conn = $db->connect();
    }
    // destructor
    function __destruct() {

    }
    /**
     * Storing new user
     * returns user details
     */
    public function storeUser($name, $email, $password) {
        $uuid = uniqid('', true);
        $hash = $this->hashSSHA($password);
        $encrypted_password = $hash["encrypted"]; // encrypted password
        $salt = $hash["salt"]; // salt
        $stmt = $this->conn->prepare("INSERT INTO users(unique_id, name,
email, encrypted_password, salt, created_at) VALUES(?, ?, ?, ?, ?,
NOW())");
        $stmt->bind_param("sssss", $uuid, $name, $email,
$encrypted_password, $salt);
        $result = $stmt->execute();
        $stmt->close();
        // check for successful store
        if ($result) {
           $query = "SELECT * FROM users WHERE email = ?";
        $stmt = $this->conn->prepare($query);
            $stmt->bind_param("s", $email);
            $stmt->execute();
            $user = $stmt->get_result()->fetch_assoc();
            $stmt->close();
            return $user;
        } else {
            return false;
        }
    }
    /**
     * Get user by email and password
     */
    public function getUserByEmailAndPassword($email, $password) {
        $query = "SELECT * FROM users WHERE email = ?";
        $stmt = $this->conn->prepare($query);
        $stmt->bind_param(1, $email);
        if ($stmt->execute()) {
            $user = $stmt->get_result()->fetch_assoc();
            $stmt->close();
            // verifying user password
            $salt = $user['salt'];
            $encrypted_password = $user['encrypted_password'];
            $hash = $this->checkhashSSHA($salt, $password);
            // check for password equality
            if ($encrypted_password == $hash) {
                // user authentication details are correct
                return $user;
            }
        } else {
            return NULL;
        }
    }
    /**
     * Check user is existed or not
     */
    public function isUserExisted($email) {
        $query = "SELECT * FROM users WHERE email = ?";
        $stmt = $this->conn->prepare($query);
        $stmt->bind_param(1, $email);
        $stmt->execute();
        $stmt->store_result();
        if ($stmt->num_rows > 0) {
            // user existed
            $stmt->close();
            return true;
        } else {
            // user not existed
            $stmt->close();
            return false;
        }
    }
    /**
     * Encrypting password
     * @param password
     * returns salt and encrypted password
     */
    public function hashSSHA($password) {
        $salt = sha1(rand());
        $salt = substr($salt, 0, 10);
        $encrypted = base64_encode(sha1($password . $salt, true) .
$salt);
        $hash = array("salt" => $salt, "encrypted" => $encrypted);
        return $hash;
    }
    /**
     * Decrypting password
     * @param salt, password
     * returns hash string
     */
    public function checkhashSSHA($salt, $password) {
        $hash = base64_encode(sha1($password . $salt, true) . $salt);
        return $hash;
    }
}
?>

<?php
class DB_Connect {
    public $conn;

    // Connecting to database
    public function connect() {
        require_once 'include/Config.php';

        // Connecting to mysql database
       // $this->conn = new mysqli(DB_HOST, DB_USER, DB_PASSWORD, DB_DATABASE);
        $connection = mysqli_connect(DB_SERVER, DB_USERNAME, DB_PASSWORD);
  if (mysqli_connect_errno()) echo "Failed to connect to MySQL: " .
mysqli_connect_error();
  $database = mysqli_select_db($connection, DB_DATABASE);

        // return database handler
        return $this->conn;
    }
}

?>