/*
 * 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.io.IOException;
import java.util.HashMap;

import org.junit.Assert;
import org.junit.Test;
import org.apache.sysds.common.Types.FileFormat;
import org.apache.sysds.hops.OptimizerUtils;
import org.apache.sysds.runtime.matrix.data.MatrixBlock;
import org.apache.sysds.runtime.matrix.data.MatrixValue.CellIndex;
import org.apache.sysds.runtime.util.DataConverter;
import org.apache.sysds.runtime.util.HDFSTool;
import org.apache.sysds.test.AutomatedTestBase;
import org.apache.sysds.test.TestConfiguration;
import org.apache.sysds.test.TestUtils;
import org.apache.sysds.utils.Statistics;

public class ReblockRecompileTest extends AutomatedTestBase 
{
	private final static String TEST_NAME1 = "rblk_recompile1";
	private final static String TEST_NAME2 = "rblk_recompile2";
	private final static String TEST_NAME3 = "rblk_recompile3";
	private final static String TEST_DIR = "functions/recompile/";
	private final static String TEST_CLASS_DIR = TEST_DIR + ReblockRecompileTest.class.getSimpleName() + "/";
	private final static double eps = 1e-10;
	
	private final static int rows = 2000;
	
	
	@Override
	public void setUp() {
		addTestConfiguration(TEST_NAME1, new TestConfiguration(TEST_CLASS_DIR, TEST_NAME1, new String[] { "Rout" }) );
		addTestConfiguration(TEST_NAME2, new TestConfiguration(TEST_CLASS_DIR, TEST_NAME2, new String[] { "Rout" }) );
		addTestConfiguration(TEST_NAME3, new TestConfiguration(TEST_CLASS_DIR, TEST_NAME3, new String[] { "Rout" }) );
	}
	
	@Test
	public void testReblockPWriteRand() {
		runReblockTest(1, System.nanoTime());
	}
	
	@Test
	public void testReblockPWriteFixed() {
		runReblockTest(1, 296304710250949L);
	}

	@Test
	public void testReblockCTableRand() {
		runReblockTest(2, System.nanoTime());
	}
	
	@Test //failed before for this particular seed
	public void testReblockCTableFixed() {
		runReblockTest(2, 296304710250949L);
	}
	
	private void runReblockTest(int scriptNum, long seed)
	{
		String TEST_NAME = null;
		switch(scriptNum) 
		{
			case 1: TEST_NAME = TEST_NAME1; break;
			case 2: TEST_NAME = TEST_NAME2; break;
			case 3: TEST_NAME = TEST_NAME3; break;
		}
		
		TestConfiguration config = getTestConfiguration(TEST_NAME);
		config.addVariable("rows", rows);
		loadTestConfiguration(config);
		
		/* This is for running the junit test the new way, i.e., construct the arguments directly */
		String HOME = SCRIPT_DIR + TEST_DIR;
		fullDMLScriptName = HOME + TEST_NAME + ".dml";
		programArgs = new String[]{"-args", input("V"), Integer.toString(rows), output("R") };
		
		fullRScriptName = HOME + TEST_NAME + ".R";
		rCmd = "Rscript" + " " + fullRScriptName + " " + inputDir() + " " + expectedDir();

		double[][] V = getRandomMatrix(rows, 1, 1, 5, 1.0d, seed);
		writeInputMatrix("V", V, true);
		
		//cleanup previous executions
		try {
			HDFSTool.deleteFileIfExistOnHDFS(output("R"));
		} catch (IOException e1){}
		
		boolean exceptionExpected = false;
		runTest(true, exceptionExpected, null, -1); //0 due to recompile 
		runRScript(true);
		
		Assert.assertEquals("Unexpected number of executed Spark instructions.",
			0, Statistics.getNoOfExecutedSPInst());
		
		//compare matrices
		try 
		{
			MatrixBlock mo = DataConverter.readMatrixFromHDFS(output("R"), FileFormat.BINARY,
				rows, 1, OptimizerUtils.DEFAULT_BLOCKSIZE, OptimizerUtils.DEFAULT_BLOCKSIZE);
			HashMap<CellIndex, Double> dmlfile = new HashMap<>();
			for( int i=0; i<mo.getNumRows(); i++ )
				for( int j=0; j<mo.getNumColumns(); j++ )
					dmlfile.put(new CellIndex(i+1,j+1), mo.get(i, j));
				
			HashMap<CellIndex, Double> rfile  = readRMatrixFromExpectedDir("Rout");
			boolean flag = TestUtils.compareMatrices(dmlfile, rfile, eps, "DML", "R");
			if( !flag )
				System.out.println("Matrix compare found differences for input data generated with seed="+seed);
		} 
		catch (IOException e) {
			Assert.fail(e.getMessage());
		}
	}
}
