/*
 * 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.pipelines;

import org.apache.sysds.common.Types.ExecMode;
import org.apache.sysds.common.Types.ExecType;
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 org.junit.Test;

import java.util.HashMap;
import java.util.Random;

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

	private final static double eps = 1e-10;
	private final static double spSparse = 0.1;
	private final static double spDense = 0.9;
	private final static Random random = new Random();

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

	@Test
	public void testImagePosterizeMatrixDenseCP() { runImagePosterizeTest(false, ExecType.CP); }

	@Test
	public void testImagePosterizeMatrixSparseCP() {
		runImagePosterizeTest(true, ExecType.CP);
	}

	@Test
	public void testImagePosterizeMatrixDenseSP() {
		runImagePosterizeTest(false, ExecType.SPARK);
	}

	@Test
	public void testImagePosterizeMatrixSparseSP() {
		runImagePosterizeTest(false, ExecType.SPARK);
	}

	@Test
	public void testImagePosterizePillow() throws Exception {
		loadTestConfiguration(getTestConfiguration(TEST_NAME));
		final int w = 500, h = 135;
		
		double[][] input = TestUtils.readExpectedResource("ImageTransformInput.csv", h, w);
		double[][] reference = TestUtils.readExpectedResource("ImageTransformPosterized.csv", h, w);
		String HOME = SCRIPT_DIR + TEST_DIR;
		fullDMLScriptName = HOME + TEST_NAME + ".dml";
		programArgs = new String[] {"-nvargs", "in_file=" + input("A"), "out_file=" + output("B"), "width=" + w,
				"height=" + h, "bits=" + 3};
		writeInputMatrixWithMTD("A", input, true);
		runTest(true, false, null, -1);

		HashMap<MatrixValue.CellIndex, Double> dmlfile = readDMLMatrixFromOutputDir("B");
		double[][] dml_res = TestUtils.convertHashMapToDoubleArray(dmlfile, h, w);
		TestUtils.compareMatrices(reference, dml_res, eps, "Pillow vs. DML");
	}

	private void runImagePosterizeTest(boolean sparse, ExecType instType) {
		ExecMode platformOld = setExecMode(instType);
		disableOutAndExpectedDeletion();

		setOutputBuffering(true);
		int rows = random.nextInt(1000) + 1;
		int cols = random.nextInt(1000) + 1;
		int bits = random.nextInt(7) + 1;

		try {
			loadTestConfiguration(getTestConfiguration(TEST_NAME));
			double sparsity = sparse ? spSparse : spDense;

			String HOME = SCRIPT_DIR + TEST_DIR;
			fullDMLScriptName = HOME + TEST_NAME + ".dml";
			programArgs = new String[] {"-nvargs", "in_file=" + input("A"), "out_file=" + output("B"), "width=" + cols,
				"height=" + rows, "bits=" + bits};

			//generate actual dataset
			double[][] A = getRandomMatrix(rows, cols, 0, 255, sparsity, 7);
			writeInputMatrixWithMTD("A", A, true);

			double[][] ref = new double[rows][cols];
			for (int i = 0; i < rows; i++) {
				for (int j = 0; j < cols; j++) {
					ref[i][j] = (int)(A[i][j] / (1 << (8 - bits))) * (1 << (8 - bits));
				}
			}

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

			//compare matrices
			HashMap<MatrixValue.CellIndex, Double> dmlfile = readDMLMatrixFromOutputDir("B");
			double[][] dml_res = TestUtils.convertHashMapToDoubleArray(dmlfile, rows, cols);
			TestUtils.compareMatrices(ref, dml_res, eps, "Java vs. DML");
		}
		finally {
			rtplatform = platformOld;
		}
	}
}
