/*
 * 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 org.apache.sysds.test.functions.recompile;

import java.util.HashMap;

import org.junit.Assert;
import org.junit.Test;
import org.apache.sysds.hops.OptimizerUtils;
import org.apache.sysds.runtime.matrix.data.MatrixValue.CellIndex;
import org.apache.sysds.test.AutomatedTestBase;
import org.apache.sysds.test.TestConfiguration;
import org.apache.sysds.utils.Statistics;

public class RandSizeExpressionEvalTest extends AutomatedTestBase 
{
	
	private final static String TEST_NAME = "rand_size_expr_eval";
	private final static String TEST_DIR = "functions/recompile/";
	private final static String TEST_CLASS_DIR = TEST_DIR + 
		RandSizeExpressionEvalTest.class.getSimpleName() + "/";
	
	private final static int rows = 14;
	private final static int cols = 14;
	
	@Override
	public void setUp() {
		addTestConfiguration( TEST_NAME, new TestConfiguration(TEST_CLASS_DIR, TEST_NAME, new String[]{} ));
	}

	@Test
	public void testComplexRand() {
		runRandTest(TEST_NAME, false, false);
	}
	
	@Test
	public void testComplexRandExprEval() {
		runRandTest(TEST_NAME, true, false);
	}
	
	@Test
	public void testComplexRandConstFold() {
		runRandTest(TEST_NAME, false, true);
	}
	
	private void runRandTest( String testName, boolean evalExpr, boolean constFold )
	{
		boolean oldFlagEval = OptimizerUtils.ALLOW_SIZE_EXPRESSION_EVALUATION;
		boolean oldFlagFold = OptimizerUtils.ALLOW_CONSTANT_FOLDING;
		boolean oldFlagRand1 = OptimizerUtils.ALLOW_RAND_JOB_RECOMPILE;
		boolean oldFlagRand2 = OptimizerUtils.ALLOW_BRANCH_REMOVAL;
		boolean oldFlagRand3 = OptimizerUtils.ALLOW_WORSTCASE_SIZE_EXPRESSION_EVALUATION;
		
		try
		{
			TestConfiguration config = getTestConfiguration(testName);
			config.addVariable("rows", rows);
			config.addVariable("cols", cols);
			loadTestConfiguration(config);
			
			String HOME = SCRIPT_DIR + TEST_DIR;
			fullDMLScriptName = HOME + testName + ".dml";
			programArgs = new String[]{"-args",
				Integer.toString(rows), Integer.toString(cols), output("R") };
	
			OptimizerUtils.ALLOW_SIZE_EXPRESSION_EVALUATION = evalExpr;
			OptimizerUtils.ALLOW_CONSTANT_FOLDING = constFold;
			
			//disable rand specific recompile
			OptimizerUtils.ALLOW_RAND_JOB_RECOMPILE = false;
			OptimizerUtils.ALLOW_BRANCH_REMOVAL = false;
			OptimizerUtils.ALLOW_WORSTCASE_SIZE_EXPRESSION_EVALUATION = false;
			
			runTest(true, false, null, -1); 
			
			//check correct propagated size via final results
			HashMap<CellIndex, Double> dmlfile = readDMLMatrixFromHDFS("R");
			Assert.assertEquals("Unexpected results.", Double.valueOf(rows*cols*3.0), dmlfile.get(new CellIndex(1,1)));
			
			//check expected number of compiled and executed MR jobs
			if( evalExpr || constFold ) {
				Assert.assertEquals("Unexpected number of executed MR jobs.",
					0, Statistics.getNoOfExecutedSPInst());
			}
			else {
				Assert.assertEquals("Unexpected number of executed MR jobs.",
					3, Statistics.getNoOfExecutedSPInst());
			}
		}
		finally {
			OptimizerUtils.ALLOW_SIZE_EXPRESSION_EVALUATION = oldFlagEval;
			OptimizerUtils.ALLOW_CONSTANT_FOLDING = oldFlagFold;
			OptimizerUtils.ALLOW_RAND_JOB_RECOMPILE = oldFlagRand1;
			OptimizerUtils.ALLOW_BRANCH_REMOVAL = oldFlagRand2;
			OptimizerUtils.ALLOW_WORSTCASE_SIZE_EXPRESSION_EVALUATION = oldFlagRand3;
		}
	}
}