/*
 * 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.builtin;

import org.junit.Assert;
import org.junit.Test;
import org.apache.commons.lang.ArrayUtils;
import org.apache.sysds.common.Types;
import org.apache.sysds.lops.LopProperties;
import org.apache.sysds.runtime.lineage.LineageCacheConfig.ReuseCacheType;
import org.apache.sysds.runtime.matrix.data.MatrixValue;
import org.apache.sysds.test.AutomatedTestBase;
import org.apache.sysds.test.TestConfiguration;
import org.apache.sysds.test.TestUtils;

import java.util.HashMap;

public class BuiltinMiceTest extends AutomatedTestBase {
	private final static String TEST_NAME = "mice";
	private final static String TEST_DIR = "functions/builtin/";
	private static final String TEST_CLASS_DIR = TEST_DIR + BuiltinMiceTest.class.getSimpleName() + "/";

	private final static String DATASET = SCRIPT_DIR +"functions/transform/input/ChickWeight.csv";
	private final static double eps = 0.16;
	private final static int iter = 3;

	@Override
	public void setUp() {
		addTestConfiguration(TEST_NAME, new TestConfiguration(TEST_CLASS_DIR, TEST_NAME, new String[]{"B"}));
	}
	@Test
	public void testMiceMixCP() {
		double[][] mask = {{ 0.0, 0.0, 1.0, 1.0, 0.0}};
		runMiceNominalTest(mask, 1, false, LopProperties.ExecType.CP);
	}

	@Test
	public void testMiceNumberCP() {
		double[][] mask = {{ 0.0, 0.0, 0.0, 0.0, 0.0}};
		runMiceNominalTest(mask, 2, false, LopProperties.ExecType.CP);
	}

	@Test
	public void testMiceCategoricalCP() {
		double[][] mask = {{ 1.0, 1.0, 1.0, 1.0, 1.0}};
		runMiceNominalTest(mask, 3, false, LopProperties.ExecType.CP);
	}

	@Test
	public void testMiceMixLineageReuseCP() {
		double[][] mask = {{ 0.0, 0.0, 1.0, 1.0, 0.0}};
		runMiceNominalTest(mask, 1, true, LopProperties.ExecType.CP);
	}

	//added a single, relatively-fast spark test, others seem infeasible
	//as forcing every operation to spark takes too long for complex,
	//composite builtins like mice.

	@Test
	public void testMiceNumberSpark() {
		double[][] mask = {{ 0.0, 0.0, 0.0, 0.0, 0.0}};
		runMiceNominalTest(mask, 2, false, LopProperties.ExecType.SPARK);
	}
	
	private void runMiceNominalTest(double[][] mask, int testType, boolean lineage, LopProperties.ExecType instType) {
		Types.ExecMode platformOld = setExecMode(instType);
		try {
			loadTestConfiguration(getTestConfiguration(TEST_NAME));
			String HOME = SCRIPT_DIR + TEST_DIR;
			fullDMLScriptName = HOME + TEST_NAME + ".dml";
			programArgs = new String[]{"-nvargs", "X=" + DATASET, "Mask="+input("M"), 
				"iteration=" + iter, "dataN=" + output("N"), "dataC=" + output("C")};
			if (lineage) {
				programArgs = (String[]) ArrayUtils.addAll(programArgs, new String[] {
					"-stats","-lineage", ReuseCacheType.REUSE_HYBRID.name().toLowerCase()});
			}
			writeInputMatrixWithMTD("M", mask, true);

			fullRScriptName = HOME + TEST_NAME + ".R";
			rCmd = getRCmd(DATASET, inputDir(), expectedDir());

			runTest(true, false, null, -1);
			runRScript(true);

			switch (testType) {
				case 1:
					testCategoricalOutput();
					testNumericOutput();
					break;
				case 2:
					testNumericOutput();
					break;
				case 3:
					testCategoricalOutput();
					break;
			}
		}
		finally {
			rtplatform = platformOld;
		}
	}

	private void testNumericOutput() {
		//compare matrices
		HashMap<MatrixValue.CellIndex, Double> dmlfileN = readDMLMatrixFromHDFS("N");
		HashMap<MatrixValue.CellIndex, Double> rfileN  = readRMatrixFromFS("N");

		// compare numerical imputations
		TestUtils.compareMatrices(dmlfileN, rfileN, eps, "Stat-DML", "Stat-R");
	}

	private void testCategoricalOutput() {
		HashMap<MatrixValue.CellIndex, Double> dmlfileC = readDMLMatrixFromHDFS("C");
		HashMap<MatrixValue.CellIndex, Double> rfileC  = readRMatrixFromFS("C");

		// compare categorical imputations
		int countTrue = 0;
		for (MatrixValue.CellIndex index : dmlfileC.keySet()) {
			Double v1 = dmlfileC.get(index);
			Double v2 = rfileC.get(index);
			if(v1.equals(v2))
				countTrue++;
		}

		if(countTrue / (double)dmlfileC.size() > 0.98)
			Assert.assertTrue(true);
		else
			Assert.fail("categorical test fails, the true value count is less than 98%");
	}
}