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/*
 * Copyright (c) 2017, SRI International
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 * Licensed under the The BSD 3-Clause License;
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package com.sri.ai.grinder.sgdpllt.interpreter;

import java.util.Random;

import com.sri.ai.grinder.helper.LazySampledFunctionApplicationTopRewriter;
import com.sri.ai.grinder.sgdpllt.api.MultiIndexQuantifierEliminator;
import com.sri.ai.grinder.sgdpllt.rewriter.api.TopRewriter;

/**
 * This interpreter will evaluate expressions, but will sample quantifiers instead of using brute force.
 * 
 * @author oreilly
 *
 */
public class SampleInterpreter extends AbstractInterpreter {
	
	private int sampleSizeN;
	private boolean alwaysSample;
	private Random random;

	public SampleInterpreter(TopRewriter baseTopRewriter, int sampleSizeN, boolean alwaysSample, Random random) {
		super();
		this.sampleSizeN = sampleSizeN;
		this.alwaysSample = alwaysSample;
		this.random = random;
		// it is important that the properties above are settled before invoking the method below
		// The reason is that setting the base top rewriter invokes {@link #makeQuantifierEliminator(TopRewriterUsingContextAssignments)},
		// which needs these properties.
		setBaseTopRewriter(new LazySampledFunctionApplicationTopRewriter(this, baseTopRewriter));
	}
	
	@Override
	protected MultiIndexQuantifierEliminator makeQuantifierEliminator(TopRewriterUsingContextAssignments topRewriterWithAssignment) {
		return new SampleMultiIndexQuantifierEliminator(topRewriterWithAssignment, sampleSizeN, alwaysSample, this, random);
	}
}