// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.schema.expressiontransforms;

import com.yahoo.searchlib.rankingexpression.RankingExpression;
import com.yahoo.searchlib.rankingexpression.transform.ConstantDereferencer;
import com.yahoo.searchlib.rankingexpression.transform.ExpressionTransformer;
import com.yahoo.searchlib.rankingexpression.transform.Simplifier;
import com.yahoo.searchlib.rankingexpression.transform.TensorMaxMinTransformer;

import java.util.List;

/**
 * The transformations done on ranking expressions done at config time before passing them on to the Vespa
 * engine for execution.
 *
 * An instance of this class has scope of a compilation of a single rank profile.
 *
 * @author bratseth
 */
public class ExpressionTransforms {

    private final List<ExpressionTransformer> transforms;

    public ExpressionTransforms() {
        transforms =
                List.of(new TensorFlowFeatureConverter(),
                        new OnnxFeatureConverter(),
                        new OnnxModelTransformer(),
                        new XgboostFeatureConverter(),
                        new LightGBMFeatureConverter(),
                        new TokenTransformer(),
                        new ConstantDereferencer(),
                        new ConstantTensorTransformer(),
                        new FunctionInliner(),
                        new FunctionShadower(),
                        new TensorMaxMinTransformer(),
                        new Simplifier(),
                        new BooleanExpressionTransformer());
    }

    public RankingExpression transform(RankingExpression expression, RankProfileTransformContext context) {
        for (ExpressionTransformer transformer : transforms)
            expression = transformer.transform(expression, context);
        return expression;
    }

}