/*
 * 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.maven.surefire.junitcore;

import java.io.File;
import java.io.PrintStream;
import java.util.HashMap;
import java.util.concurrent.ExecutionException;

import org.apache.maven.plugin.surefire.StartupReportConfiguration;
import org.apache.maven.plugin.surefire.extensions.SurefireConsoleOutputReporter;
import org.apache.maven.plugin.surefire.extensions.SurefireStatelessReporter;
import org.apache.maven.plugin.surefire.extensions.SurefireStatelessTestsetInfoReporter;
import org.apache.maven.plugin.surefire.log.api.NullConsoleLogger;
import org.apache.maven.plugin.surefire.report.DefaultReporterFactory;
import org.apache.maven.surefire.api.report.ReporterFactory;
import org.apache.maven.surefire.api.testset.TestSetFailedException;
import org.junit.runner.Computer;
import org.junit.runner.JUnitCore;
import org.junit.runner.Result;

import static org.apache.maven.surefire.api.report.ConsoleOutputCapture.startCapture;
import static org.apache.maven.surefire.junitcore.ConcurrentRunListener.createInstance;

/**
 * @author Kristian Rosenvold
 */
public class JUnitCoreTester {
    private final Computer computer;

    public JUnitCoreTester() {
        this(new Computer());
    }

    public JUnitCoreTester(Computer computer) {
        this.computer = computer;
    }

    public Result run(boolean parallelClasses, Class<?>... classes) throws TestSetFailedException, ExecutionException {
        ReporterFactory reporterManagerFactory = defaultNoXml();
        PrintStream out = System.out;
        PrintStream err = System.err;
        try {
            HashMap<String, TestSet> classMethodCounts = new HashMap<>();
            ConcurrentRunListener reporter =
                    createInstance(classMethodCounts, reporterManagerFactory, parallelClasses, false);
            JUnitCoreRunListener runListener = new JUnitCoreRunListener(reporter, classMethodCounts);
            startCapture(runListener);
            JUnitCore junitCore = new JUnitCore();

            junitCore.addListener(runListener);
            final Result run = junitCore.run(computer, classes);
            junitCore.removeListener(runListener);
            return run;
        } finally {
            System.setOut(out);
            System.setErr(err);
            reporterManagerFactory.close();
            if (computer instanceof ConfigurableParallelComputer) {
                ((ConfigurableParallelComputer) computer).close();
            }
        }
    }

    /**
     * For testing purposes only.
     *
     * @return DefaultReporterFactory for testing purposes
     */
    public static DefaultReporterFactory defaultNoXml() {
        return new DefaultReporterFactory(defaultStartupReportConfiguration(), new NullConsoleLogger());
    }

    /**
     * For testing purposes only.
     *
     * @return StartupReportConfiguration fo testing purposes
     */
    private static StartupReportConfiguration defaultStartupReportConfiguration() {
        File target = new File("./target");
        File statisticsFile = new File(target, "TESTHASHxXML");
        return new StartupReportConfiguration(
                true,
                true,
                "PLAIN",
                false,
                target,
                false,
                null,
                statisticsFile,
                false,
                0,
                null,
                null,
                false,
                true,
                true,
                new SurefireStatelessReporter(),
                new SurefireConsoleOutputReporter(),
                new SurefireStatelessTestsetInfoReporter());
    }
}
