/*
 * 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.federated.codegen;

import java.io.File;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;

import org.apache.sysds.common.Types.ExecMode;
import org.apache.sysds.runtime.matrix.data.MatrixValue.CellIndex;
import org.apache.sysds.runtime.meta.MatrixCharacteristics;
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.junit.Assert;
import org.junit.BeforeClass;
import org.junit.Ignore;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

@RunWith(value = Parameterized.class)
@net.jcip.annotations.NotThreadSafe
public class FederatedRowwiseTmplTest extends AutomatedTestBase {
	// private static final Log LOG = LogFactory.getLog(FederatedRowwiseTmplTest.class.getName());
	private final static String TEST_NAME = "FederatedRowwiseTmplTest";

	private final static String TEST_DIR = "functions/federated/codegen/";
	private final static String TEST_CLASS_DIR = TEST_DIR + FederatedRowwiseTmplTest.class.getSimpleName() + "/";

	private final static String TEST_CONF = "SystemDS-config-codegen.xml";

	private final static String OUTPUT_NAME = "Z";
	private final static double TOLERANCE = 1e-9;
	private final static int BLOCKSIZE = 1024;

	@Parameterized.Parameter()
	public int test_num;
	@Parameterized.Parameter(1)
	public int rows;
	@Parameterized.Parameter(2)
	public int cols;
	@Parameterized.Parameter(3)
	public boolean row_partitioned;

	@Override
	public void setUp() {
		addTestConfiguration(TEST_NAME, new TestConfiguration(TEST_CLASS_DIR, TEST_NAME, new String[]{OUTPUT_NAME}));
	}

	@Parameterized.Parameters
	public static Collection<Object[]> data() {
		// rows must be even
		return Arrays.asList(new Object[][] {
			// {test_num, rows, cols, row_paritioned}

			// row partitioned
			{1, 6, 4, true},
			// {2, 6, 2, true},
			{3, 6, 4, true},
			{4, 6, 4, true},
			{10, 150, 10, true},
			{15, 150, 10, true},
			// {20, 1500, 8, true},
			{21, 1500, 8, true},
			{25, 600, 10, true},
			{31, 150, 10, true},
			// {40, 300, 20, true},
			{45, 1500, 100, true},
			{50, 376, 4, true},
			
			// col partitioned (should not create a federated spoof instruction)
			// column partitioned federated data is not supported within federated rowwise templates
			{1, 6, 4, false},
			{3, 6, 4, false},
			{15, 150, 10, false},
			{25, 600, 10, false},
			{31, 150, 10, false},
			{50, 376, 4, false},
		});
	}

	@BeforeClass
	public static void init() {
		TestUtils.clearDirectory(TEST_DATA_DIR + TEST_CLASS_DIR);
	}

	@Test
	@Ignore
	public void federatedCodegenRowwiseSingleNode() {
		testFederatedCodegenRowwise(ExecMode.SINGLE_NODE);
	}
	
	@Test
	@Ignore
	public void federatedCodegenRowwiseSpark() {
		testFederatedCodegenRowwise(ExecMode.SPARK);
	}

	@Test
	public void federatedCodegenRowwiseHybrid() {
		testFederatedCodegenRowwise(ExecMode.HYBRID);
	}

	private void testFederatedCodegenRowwise(ExecMode exec_mode) {
		// store the previous platform config to restore it after the test
		ExecMode platform_old = setExecMode(exec_mode);

		getAndLoadTestConfiguration(TEST_NAME);
		String HOME = SCRIPT_DIR + TEST_DIR;

		int fed_rows = rows;
		int fed_cols = cols;
		if(row_partitioned)
			fed_rows /= 2;
		else
			fed_cols /= 2;

		// generate dataset
		// matrix handled by two federated workers
		double[][] X1 = TestUtils.generateTestMatrix(fed_rows, fed_cols, 1, 10, 1.0, 3);
		double[][] X2 = TestUtils.generateTestMatrix(fed_rows, fed_cols, 1, 10, 1.0, 11);

		writeInputMatrixWithMTD("X1", X1, false, new MatrixCharacteristics(fed_rows, fed_cols, BLOCKSIZE, fed_rows * fed_cols));
		writeInputMatrixWithMTD("X2", X2, false, new MatrixCharacteristics(fed_rows, fed_cols, BLOCKSIZE, fed_rows * fed_cols));

		// empty script name because we don't execute any script, just start the worker
		fullDMLScriptName = "";
		int port1 = getRandomAvailablePort();
		int port2 = getRandomAvailablePort();
		Thread[] workers = startLocalFedWorkerThreads(new int[] {port1, port2});

		getAndLoadTestConfiguration(TEST_NAME);

		// Run reference dml script with normal matrix
		fullDMLScriptName = HOME + TEST_NAME + "Reference.dml";
		programArgs = new String[] {"-stats", "-nvargs",
			"in_X1=" + input("X1"), "in_X2=" + input("X2"),
			"in_rp=" + Boolean.toString(row_partitioned).toUpperCase(),
			"in_test_num=" + Integer.toString(test_num),
			"out_Z=" + expected(OUTPUT_NAME)};
		runTest(null);

		// Run actual dml script with federated matrix
		fullDMLScriptName = HOME + TEST_NAME + ".dml";
		programArgs = new String[] {"-stats", "-nvargs",
			"in_X1=" + TestUtils.federatedAddress(port1, input("X1")),
			"in_X2=" + TestUtils.federatedAddress(port2, input("X2")),
			"in_rp=" + Boolean.toString(row_partitioned).toUpperCase(),
			"in_test_num=" + Integer.toString(test_num),
			"rows=" + rows, "cols=" + cols,
			"out_Z=" + output(OUTPUT_NAME)};
		runTest(null);

		// compare the results via files
		HashMap<CellIndex, Double> refResults = readDMLMatrixFromExpectedDir(OUTPUT_NAME);
		HashMap<CellIndex, Double> fedResults = readDMLMatrixFromOutputDir(OUTPUT_NAME);

		TestUtils.compareMatrices(fedResults, refResults, TOLERANCE, "Fed", "Ref");

		TestUtils.shutdownThreads(workers);

		// check for federated operations
		if(row_partitioned)
			Assert.assertTrue(heavyHittersContainsSubString("fed_spoofRA"));

		// check that federated input files are still existing
		Assert.assertTrue(HDFSTool.existsFileOnHDFS(input("X1")));
		Assert.assertTrue(HDFSTool.existsFileOnHDFS(input("X2")));

		resetExecMode(platform_old);
	}

	/**
	 * Override default configuration with custom test configuration to ensure
	 * scratch space and local temporary directory locations are also updated.
	 */
	@Override
	protected File getConfigTemplateFile() {
		// Instrumentation in this test's output log to show custom configuration file used for template.
		File TEST_CONF_FILE = new File(SCRIPT_DIR + TEST_DIR, TEST_CONF);
		return TEST_CONF_FILE;
	}
}
