/*
 * Copyright 2017
 * Ubiquitous Knowledge Processing (UKP) Lab
 * Technische Universität Darmstadt
 *
 * 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 org.dkpro.core.tokit;

import static org.apache.uima.fit.util.JCasUtil.select;

import java.util.ArrayList;
import java.util.Collection;

import org.apache.uima.analysis_engine.AnalysisEngineProcessException;
import org.apache.uima.fit.component.JCasAnnotator_ImplBase;
import org.apache.uima.fit.descriptor.ConfigurationParameter;
import org.apache.uima.fit.descriptor.TypeCapability;
import org.apache.uima.jcas.JCas;

import de.tudarmstadt.ukp.dkpro.core.api.segmentation.type.Token;
import eu.openminted.share.annotations.api.Component;
import eu.openminted.share.annotations.api.constants.OperationType;

/**
 * Remove prefixes and suffixes from tokens.
 */
@Component(OperationType.NORMALIZER)
@TypeCapability(
        inputs = {
                "de.tudarmstadt.ukp.dkpro.core.api.segmentation.type.Token"},
        outputs = {
                "de.tudarmstadt.ukp.dkpro.core.api.segmentation.type.Token" })
public class TokenTrimmer
    extends JCasAnnotator_ImplBase
{
    /**
     * List of prefixes to remove.
     */
    public static final String PARAM_PREFIXES = "prefixes";
    @ConfigurationParameter(name = PARAM_PREFIXES, mandatory = true)
    private String[] prefixes;

    /**
     * List of suffixes to remove.
     */
    public static final String PARAM_SUFFIXES = "suffixes";
    @ConfigurationParameter(name = PARAM_SUFFIXES, mandatory = true)
    private String[] suffixes;

    @Override
    public void process(JCas aJCas) throws AnalysisEngineProcessException
    {
        Collection<Token> toRemove = new ArrayList<Token>();
        for (Token t : select(aJCas, Token.class)) {
            String text = t.getCoveredText();
            for (String prefix : prefixes) {
                if (text.startsWith(prefix)) {
                    t.setBegin(t.getBegin() + prefix.length());
                    break;
                }
            }

            text = t.getCoveredText();
            for (String suffix : suffixes) {
                if (text.endsWith(suffix)) {
                    t.setEnd(t.getEnd() - suffix.length());
                    break;
                }
            }

            if (t.getCoveredText().length() == 0) {
                toRemove.add(t);
            }
        }
        for (Token t : toRemove) {
            t.removeFromIndexes();
        }
    }
}
