namespace ProEventsApp
{
public class OnSignUpEventArgs : EventArgs
{
    public int zID;
    public string zUsername;
    public string zPassword;
    public string zConfirmPassword;

    public OnSignUpEventArgs(string username, string password, string confirmPassword ) : base()
    {
        zUsername = username;
        zPassword = password;
        zConfirmPassword = confirmPassword;
    }
}
[Activity(Label = "Dialog_SignUp")]
public class Dialog_SignUp : Activity
{
    public static MobileServiceClient Client =
    new MobileServiceClient("https://proevents.azurewebsites.net");

    // public event EventHandler<OnSignUpEventArgs> ZOnSignUpComplete;
    protected async override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        SetContentView(Resource.Layout.Dialog_Sign_Up);

        var zBtnSignUp = FindViewById<Button>(Resource.Id.btnDialogSignup);
        zBtnSignUp.Click += ZBtnSignUp_Click;
        EditText zTxtUsername = FindViewById<EditText>(Resource.Id.txtUsername);
        zTxtUsername.TextChanged += ValidateInput;
        EditText zTxtPassword = FindViewById<EditText>(Resource.Id.txtPassword);
        zTxtPassword.TextChanged += ValidateInput;
        EditText zTxtConfirmPassword = FindViewById<EditText>(Resource.Id.txtConfirmPassword);
        zTxtConfirmPassword.TextChanged += ValidateInput;
    }

    private async void ZBtnSignUp_Click(object sender, EventArgs e)
    {
        EditText Username = FindViewById<EditText>(Resource.Id.txtUsername);
        EditText Password = FindViewById<EditText>(Resource.Id.txtPassword);
        EditText ConfirmPassword = FindViewById<EditText>(Resource.Id.txtConfirmPassword);
        if (Password.Text == ConfirmPassword.Text)
        {
            string hashedPassword = PasswordStorage.CreateHash(Password.Text);
            string userName = Username.Text.Trim();
            users newU = new users { username = userName, password = hashedPassword };
            List<users> allUsers = await Client.GetTable<users>().ToListAsync();                Toast.MakeText(this, "Awaits table", ToastLength.Short).Show();
            users u = allUsers.FirstOrDefault(x => x.username == newU.username);
            if (u == null)
            {
                DBHelper.InsertNewUser(newU);
                Toast.MakeText(this, "User " + newU.username + " created! You can now log in!", ToastLength.Short).Show();
                StartActivity(typeof(MainActivity));
            }
            else
            {
                Toast.MakeText(this, "User " + u.username + " already exists!", ToastLength.Short).Show();
            }
        }
        else
        {
            string message = "Passwords don't match.";
            Toast.MakeText(this, message, ToastLength.Short).Show();
        }
     }

    private void ValidateInput(object sender, TextChangedEventArgs e)
    {
        EditText input = (EditText)sender;
        string pattern = "[^a-zA-Z0-9#?]";
        if (Regex.IsMatch(input.Text, pattern))
        {
            string message = "Input must only contain alphabetic characters, numbers, ? and #";
            Toast.MakeText(this, message, ToastLength.Long).Show();
            input.Text = "";
        }
    }
}