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/*
 * Copyright 2015 Steve Ash
 *
 * 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 com.github.steveash.jg2p;

import com.google.common.base.Optional;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;

import com.github.steveash.jg2p.abb.PatternFacade;
import com.github.steveash.jg2p.phoseq.Graphemes;
import com.github.steveash.jg2p.rerank.RerankExample;
import com.github.steveash.jg2p.rerank.RerankableEncoder;
import com.github.steveash.jg2p.rerank.RerankableResult;
import com.github.steveash.jg2p.rerank.RerankerResult;

import java.util.List;

/**
 * The encoder that uses the phoneticEncoder to produce a candidate list and then reranks it using the reranking
 * algorithm and delegating to the Rerank Model
 * @author Steve Ash
 */
public class PipelineEncoder implements Encoder {

  private final PipelineModel model;
  private final RerankableEncoder rerankEncoder;
  private final boolean useRules;

  public PipelineEncoder(PipelineModel model) {
    this(model, true);
  }

  public PipelineEncoder(PipelineModel model, boolean useRules) {
    this.model = model;
    this.useRules = useRules;
    this.rerankEncoder = model.getRerankEncoder();
  }

  @Override
  public List encode(Word input) {
    Optional maybe = PatternFacade.maybeTranscode(input);
    Word xformedInput = Graphemes.xformForEval(input);
    RerankableResult result = rerankEncoder.encode(xformedInput);
    List rre = RerankExample.makeExamples(result, xformedInput, null);
    List reranked = model.getRerankerModel().probabilities(rre);
    List finalResults = Lists.transform(reranked, RerankerResult.SelectEncoding);
    if (maybe.isPresent()) {
      PhoneticEncoder.Encoding newFirst = PhoneticEncoder.Encoding.createEncoding(
          xformedInput.getValue(), Word.fromSpaceSeparated(maybe.get()).getValue(), ImmutableList.of(), 0, 0, 0, 0);
      finalResults = ImmutableList.builder()
          .add(newFirst)
          .addAll(finalResults)
          .build();
    }
    return finalResults;
  }
}