/**
 * Copyright (c) 2004-2011 QOS.ch
 * All rights reserved.
 *
 * Permission is hereby granted, free  of charge, to any person obtaining
 * a  copy  of this  software  and  associated  documentation files  (the
 * "Software"), to  deal in  the Software without  restriction, including
 * without limitation  the rights to  use, copy, modify,  merge, publish,
 * distribute,  sublicense, and/or sell  copies of  the Software,  and to
 * permit persons to whom the Software  is furnished to do so, subject to
 * the following conditions:
 *
 * The  above  copyright  notice  and  this permission  notice  shall  be
 * included in all copies or substantial portions of the Software.
 *
 * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
 * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
 * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */
package org.slf4j.profiler;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;

import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ProfilerTest {

    Logger logger = LoggerFactory.getLogger(ProfilerTest.class);

    @Test
    public void testSmoke() {
        Profiler profiler = new Profiler("SMOKE");
        profiler.stop();
        StopWatch gSW = profiler.globalStopWatch;

        // verify
        profiler.sanityCheck();
        assertEquals(TimeInstrumentStatus.STOPPED, gSW.status);
        assertEquals(0, profiler.childTimeInstrumentList.size());
        assertNull(profiler.getLastTimeInstrument());
    }

    @Test
    public void testBasicProfiling() {
        Profiler profiler = new Profiler("BAS");

        profiler.start("doX");
        doX(1);

        profiler.start("doY");
        doY(10);

        profiler.start("doZ");
        doZ(2);
        profiler.stop();

        // verify
        profiler.sanityCheck();
        StopWatch gSW = profiler.globalStopWatch;
        assertEquals(TimeInstrumentStatus.STOPPED, gSW.status);
        assertEquals(3, profiler.childTimeInstrumentList.size());
        assertNotNull(profiler.getLastTimeInstrument());
        assertEquals("doZ", profiler.getLastTimeInstrument().getName());
    }

    // + Profiler [BAS]
    // |-- elapsed time [doX] 1.272 milliseconds.
    // |-- elapsed time [doYYYYY] 25.398 milliseconds.
    // |--+ Profiler [subtask]
    // |-- elapsed time [n1] 1.434 milliseconds.
    // |-- elapsed time [n2] 5.855 milliseconds.
    // |-- Total elapsed time [subtask] 7.321 milliseconds.
    // |-- elapsed time [doZ] 3.211 milliseconds.
    // |-- Total elapsed time [BAS] 30.317 milliseconds.
    @Test
    public void testNestedProfiling() {

        Profiler profiler = new Profiler("BAS");
        profiler.setLogger(logger);
        profiler.start("doX");
        doX(1);

        profiler.start("doYYYYY");
        for (int i = 0; i < 5; i++) {
            doY(i);
        }
        Profiler nested = profiler.startNested("subtask");
        doSubtask(nested);
        profiler.start("doZ");
        doZ(2);
        profiler.stop();

        // verify
        profiler.sanityCheck();
        StopWatch gSW = profiler.globalStopWatch;
        assertEquals(TimeInstrumentStatus.STOPPED, gSW.status);
        // assertEquals(3, profiler.stopwatchList.size());
        assertEquals(4, profiler.childTimeInstrumentList.size());
        assertNotNull(profiler.getLastTimeInstrument());
        assertEquals("doZ", profiler.getLastTimeInstrument().getName());

    }

    private void doX(int millis) {
        delay(millis);
    }

    private void doY(int millis) {
        delay(millis);
    }

    private void doZ(int millis) {
        delay(millis);
    }

    public void doSubtask(Profiler nested) {
        nested.start("n1");
        doX(1);

        nested.start("n2");
        doX(5);
        nested.stop();
    }

    void delay(int millis) {
        try {
            Thread.sleep(millis);
        } catch (InterruptedException e) {
        }
    }
}
