/*

 * Copyright (c) 2014, 2017, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package com.oracle.mxtool.junit;

import java.util.Map;

import org.junit.runner.Description;

/**

 * Timing support for JUnit test runs.

 */

class TimingDecorator extends MxRunListenerDecorator {

    private long startTime;

    private long classStartTime;

    private Description currentTest;

    final Map<Class<?>, Long> classTimes;

    final Map<Description, Long> testTimes;

    TimingDecorator(MxRunListener l) {

        super(l);

    }

    @Override

    public void testClassStarted(Class<?> clazz) {

        classStartTime = System.nanoTime();

        super.testClassStarted(clazz);

    }

    @Override

    public void testClassFinished(Class<?> clazz, int numPassed, int numFailed) {

        long totalTime = System.nanoTime() - classStartTime;

        super.testClassFinished(clazz, numPassed, numFailed);

        if (beVerbose()) {

            getWriter().print(' ' + valueToString(totalTime));

        }

        classTimes.put(clazz, totalTime / 1_000_000);

    }

    @Override

    public void testStarted(Description description) {

        currentTest = description;

        startTime = System.nanoTime();

        super.testStarted(description);

    }

    @Override

    public void testFinished(Description description) {

        long totalTime = System.nanoTime() - startTime;

        super.testFinished(description);

        if (beVerbose()) {

            getWriter().print(" " + valueToString(totalTime));

        }

        currentTest = null;

        testTimes.put(description, totalTime / 1_000_000);

    }

    private static String valueToString(long valueNS) {

        long timeWholeMS = valueNS / 1_000_000;

        long timeFractionMS = (valueNS / 100_000) % 10;

        return String.format("%d.%d ms", timeWholeMS, timeFractionMS);

    }

    /**

     * Gets the test currently starting but not yet completed along with the number of milliseconds

     * it has been executing.

     *

     * @return {@code null} if there is no test currently executing

     */

    public Object[] getCurrentTestDuration() {

        Description current = currentTest;

        if (current != null) {

            long timeMS = (System.nanoTime() - startTime) / 1_000_000;

            return new Object[]{current, timeMS};

        }

        return null;

    }

}