/**
 * Yobi, Project Hosting SW
 *
 * Copyright 2013 NAVER Corp.
 * http://yobi.io
 *
 * @author Jungkook Kim
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package utils;

import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import models.User;

import org.apache.commons.lang.StringUtils;

import play.api.Play;
import play.data.validation.Constraints.Validator;
import play.libs.Scala;
import scala.Tuple3;
import static play.libs.F.*;

/**
 * Reserved words Validator
 *
 */
public class ReservedWordsValidator extends Validator<String> {
    public static final String MESSAGE = "validation.reservedWord";
    public static final Set<String> RESERVED_WORDS;

    static {
        RESERVED_WORDS = new HashSet<>();
        List<Tuple3<String, String, String>> list = Scala.asJava(Play.current().routes().get().documentation());
        play.Configuration config = play.Configuration.root();
        String context = config.getString("application.context", "/");
        String regex = String.format("^%s%s(%s)/?",
                context,
                (context.endsWith("/") ? "" : "/"),
                User.LOGIN_ID_PATTERN);
        Pattern pattern = Pattern.compile(regex);
        for (Tuple3<String, String, String> tuple : list) {
            Matcher matcher = pattern.matcher(tuple._2());
            if (matcher.find()) {
                RESERVED_WORDS.add(matcher.group(1));
            }
        }
        RESERVED_WORDS.add("new");
    }

    /**
     * get error message key
     *
     * @return errorMessageKey
     * @see play.data.validation.Constraints.Validator#getErrorMessageKey()
     */
    @Override
    public Tuple<String, Object[]> getErrorMessageKey() {
        return Tuple(MESSAGE, new Object[] {});
    }

    /**
     * check the input string is valid or not
     *
     * @param string input string
     * @return true if the input string is not a reserved word; false otherwise
     * @see play.data.validation.Constraints.Validator#isValid(java.lang.Object)
     */
    @Override
    public boolean isValid(String string) {
        return !isReserved(string);
    }

    /**
     * check the input string is a reserved word or not
     *
     * @param string input string
     * @return true if the input string is a reserved word; false otherwise
     */
    public static boolean isReserved(String string) {
        for (String word : RESERVED_WORDS) {
            if (StringUtils.equalsIgnoreCase(string, word)) {
                return true;
            }
        }
        return false;
    }
}