struct UserInfo: Codable {
    var fullname: String
    var email: String
    var username: String
    var cardNumber: Int
}

//pripravime json oject s dotazem na server
let username = "" //sem se musi propsat promena z policka v appce - user
let password = "" //sem se musi propsat promena z policka v appce - pass

password = nejakametodasifrovanihesel(password); //rovnou zmenit heslo na hash
let json: [String: Any] = ["user": username, "pass" : password]

let jsonData = try? JSONSerialization.data(withJSONObject: json)

// create post request
let url = URL(string: "http://www.deegym.com/deeid/api/loginRequest.php")! // tady je adresa ktera vykona request
var request = URLRequest(url: url)
request.httpMethod = "POST"

// insert json data to the request
request.httpBody = jsonData

let task = URLSession.shared.dataTask(with: request) { data, response, error in
    guard let data = data, error == nil else {
        print(error?.localizedDescription ?? "No data") // Chyba nic se nám nevrátilo = chybný login
        return
    }
    let responseJSON = try? JSONSerialization.jsonObject(with: data, options: [])
    if let responseJSON = responseJSON as? [String: Any] {
        let decoder = JSONDecoder()
    let userInfo = try decoder.decode(UserInfo.self, from: json)

    //tady uz budes setovat veci do aplikace a v tehlech promenych mas ulozeny info o uzoivatelich
    userInfo.fullname       //Celé jméno z db
    userInfo.cardNumber     //číslo čipu z DB (deeid)
    userInfo.email          //Klientův email

    }
}

task.resume()