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/*
 * Copyright (c) 2016 Villu Ruusmann
 *
 * This file is part of JPMML-SparkML
 *
 * JPMML-SparkML is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * JPMML-SparkML is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with JPMML-SparkML.  If not, see .
 */
package org.jpmml.sparkml.feature;

import java.util.List;

import org.apache.spark.ml.PipelineModel;
import org.apache.spark.ml.Transformer;
import org.apache.spark.ml.feature.RFormulaModel;
import org.apache.spark.ml.feature.ResolvedRFormula;
import org.jpmml.converter.Feature;
import org.jpmml.sparkml.ConverterFactory;
import org.jpmml.sparkml.FeatureConverter;
import org.jpmml.sparkml.SparkMLEncoder;
import org.jpmml.sparkml.TransformerConverter;

public class RFormulaModelConverter extends FeatureConverter {

	public RFormulaModelConverter(RFormulaModel transformer){
		super(transformer);
	}

	@Override
	public void registerFeatures(SparkMLEncoder encoder){
		RFormulaModel transformer = getTransformer();

		ResolvedRFormula resolvedFormula = transformer.resolvedFormula();

		String targetCol = resolvedFormula.label();

		String labelCol = transformer.getLabelCol();
		if(!(targetCol).equals(labelCol)){
			List features = encoder.getFeatures(targetCol);

			encoder.putFeatures(labelCol, features);
		}

		ConverterFactory converterFactory = encoder.getConverterFactory();

		PipelineModel pipelineModel = transformer.pipelineModel();

		Transformer[] stages = pipelineModel.stages();
		for(Transformer stage : stages){
			TransformerConverter converter = converterFactory.newConverter(stage);

			if(converter instanceof FeatureConverter){
				FeatureConverter featureConverter = (FeatureConverter)converter;

				featureConverter.registerFeatures(encoder);
			} else

			{
				throw new IllegalArgumentException("Expected a subclass of " + FeatureConverter.class.getName() + ", got " + (converter != null ? ("class " + (converter.getClass()).getName()) : null));
			}
		}
	}
}