/*
 * 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 opennlp.morfologik.builder;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Path;
import java.util.Properties;

import morfologik.stemming.DictionaryMetadata;
import morfologik.stemming.EncoderType;
import morfologik.tools.DictCompile;

/**
 * Utility class to build Morfologik dictionaries from a tab separated values
 * file. The first column is the word, the second its lemma and the third a POS
 * tag. If there is no lemma information leave the second column empty.
 */
public class MorfologikDictionayBuilder {

  /**
   * Helper to compile a morphological dictionary automaton.
   * 
   * @param input
   *          The input file (base,inflected,tag). An associated metadata
   *          (*.info) file must exist.
   * @param overwrite
   *          Overwrite the output file if it exists.
   * @param validate
   *          Validate input to make sure it makes sense.
   * @param acceptBom
   *          Accept leading BOM bytes (UTF-8).
   * @param acceptCr
   *          Accept CR bytes in input sequences (\r).
   * @param ignoreEmpty
   *          Ignore empty lines in the input.
   * @return the dictionary path
   * 
   * @throws Exception
   */
  public Path build(Path input, boolean overwrite, boolean validate,
      boolean acceptBom, boolean acceptCr, boolean ignoreEmpty)
      throws Exception {

    DictCompile compiler = new DictCompile(input, overwrite, validate,
        acceptBom, acceptCr, ignoreEmpty);
    compiler.call();

    
    Path metadataPath = DictionaryMetadata
        .getExpectedMetadataLocation(input);
    
    return metadataPath.resolveSibling(
        metadataPath.getFileName().toString().replaceAll(
            "\\." + DictionaryMetadata.METADATA_FILE_EXTENSION + "$", ".dict"));
  }

  /**
   * Helper to compile a morphological dictionary automaton using default
   * parameters.
   * 
   * @param input
   *          The input file (base,inflected,tag). An associated metadata
   *          (*.info) file must exist.
   *          
   *  @return the dictionary path
   * 
   * @throws Exception
   */
  public Path build(Path input) throws Exception {

    return build(input, true, true, false, false, false);

  }

  Properties createProperties(Charset encoding, String separator,
      EncoderType encoderType) throws FileNotFoundException, IOException {

    Properties properties = new Properties();
    properties.setProperty("fsa.dict.separator", separator);
    properties.setProperty("fsa.dict.encoding", encoding.name());
    properties.setProperty("fsa.dict.encoder", encoderType.name());

    return properties;

  }
}