/*
 * $Id$
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.struts2.showcase.hangman;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Properties;

public class PropertiesVocabSource implements VocabSource {

    private Properties prop;
    private List<Vocab> vocabs;

    public PropertiesVocabSource() {
    }

    public PropertiesVocabSource(Properties prop) {
        assert(prop != null);
        this.prop = prop;
        vocabs = readVocab(prop);
    }

    public void setVocabProperties(Properties prop) {
        assert(prop != null);
        this.prop = prop;
        vocabs = readVocab(prop);
    }

    public Vocab getRandomVocab() {
        if (vocabs == null) {
            throw new HangmanException(HangmanException.Type.valueOf("NO_VOCAB_SOURCE"), "No vocab source");
        }
        if (vocabs.size() <= 0) {
            throw new HangmanException(HangmanException.Type.valueOf("NO_VOCAB"), "No vocab");
        }
        long vocabIndex = Math.round((Math.random() * (double)prop.size()));
        vocabIndex = vocabIndex == vocabs.size() ? vocabs.size() - 1 : vocabIndex;
        return vocabs.get((int)vocabIndex);
    }

    protected List<Vocab> readVocab(Properties prop) {
        List<Vocab> vocabList = new ArrayList<Vocab>();

        for (Map.Entry e : prop.entrySet()) {
            String vocab = (String) e.getKey();
            String hint = (String) e.getValue();

            vocabList.add(new Vocab(vocab, hint));
        }
        return vocabList;
    }
}
