LoginViewController

class LoginViewController: UIViewController {
    
    @IBOutlet weak var emailTextFeild: UITextField!
    @IBOutlet weak var passwordTextFeild: UITextField!
    
    @IBAction func userDidTapLogin(_ sender: UIButton) {
        
        // validate user inputs
        guard let email = emailTextFeild.text, !email.isEmpty else {
            showErrorMessage(message: "No valid email is entered")
            return
        }
        
        guard let password = passwordTextFeild.text, !email.isEmpty else {
            showErrorMessage(message: "No valid password is entered")
            return
        }
        
        
        
        // call network and verify login
        var comp = URLComponents(string: "http://api.github.com/login")
        
        comp?.queryItems = [URLQueryItem(name: "email", value: email), URLQueryItem(name: "password", value: password)]
        
        URLSession.shared.dataTask(with: comp!.url!) {[weak self] (response, _, _) in
            if response != nil {
                self?.performSegue(withIdentifier: "moveToHome", sender: nil)
            }
        }
        
    }
    
    
    func showErrorMessage(message: String) {
        // show error implementation
    }
    
}