/*
 * @Copyright 2018-2026 HardBackNutter
 * @License GNU General Public License
 *
 * This file is part of NeverTooManyBooks.
 *
 * NeverTooManyBooks is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * NeverTooManyBooks is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with NeverTooManyBooks. If not, see <http://www.gnu.org/licenses/>.
 */
package com.hardbacknutter.nevertoomanybooks.datamanager.validators;

import android.content.Context;

import androidx.annotation.NonNull;
import androidx.annotation.StringRes;

import com.hardbacknutter.nevertoomanybooks.R;
import com.hardbacknutter.nevertoomanybooks.datamanager.DataManager;

/**
 * Validator that requires a blank field.
 */
public class BlankValidator
        implements DataValidator {

    @Override
    public void validate(@NonNull final Context context,
                         @NonNull final DataManager dataManager,
                         @NonNull final String key,
                         @StringRes final int errorLabelResId)
            throws ValidatorException {

        final String s = dataManager.getString(key, null);
        if (s == null) {
            // store an empty string.
            dataManager.putString(key, "");
            return;
        }
        if (s.isEmpty()) {
            // all OK
            return;
        }
        throw new ValidatorException(context.getString(R.string.vldt_blank_required_for_x,
                                                       context.getString(errorLabelResId)));
    }
}
