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/*
 * Copyright © 2016-2017 European Support Limited
 *
 * Licensed 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 a "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.openecomp.onboarding.build.test;

import org.junit.Assert;
import org.junit.Test;

import java.io.File;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.Collections;

public class StaleCodeDetectionTest {

    private static final String JAVA_EXT = ".java";
    private static final String CLASS_EXT = ".class";

    @Test
    public void checkIfStale() {

        String moduleLocation = System.getProperty("basedir");
        if (isStale(moduleLocation + File.separator + "target" + File.separator + "test-classes",
                moduleLocation + File.separator + "src" + File.separator + "test" + File.separator + "java")) {
            Assert.fail("****** Please remove 'target' directory manually under path " + moduleLocation);
        }
    }

    private boolean isStale(String compiledCodeLocation, String javaSourceLocation) {
        File compiledFiles = new File(compiledCodeLocation);
        File[] list = compiledFiles.listFiles((dir, file) -> file.endsWith(CLASS_EXT) && file.indexOf('$') == -1);
        if (list == null || list.length == 0) {
            return false;
        }
        File candidate = Collections.min(Arrays.asList(list),
                (file1, file2) -> file1.lastModified() >= file2.lastModified() ? 1 : -1);
        String sourceFilePath = javaSourceLocation + candidate.getAbsolutePath().replace(compiledCodeLocation, "")
                                                              .replace(CLASS_EXT, JAVA_EXT);
        return !Paths.get(sourceFilePath).toFile().exists();
    }
}