/*
 Copyright (c) 2018-2023, Stephen Gold
 All rights reserved.

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 * Neither the name of the copyright holder nor the names of its contributors
 may be used to endorse or promote products derived from this software without
 specific prior written permission.

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 */
package jme3utilities.minie.test.issue;

import com.jme3.app.Application;
import com.jme3.app.SimpleApplication;
import com.jme3.bullet.BulletAppState;
import com.jme3.bullet.PhysicsSpace;
import java.util.logging.Logger;

/**
 * Test case for JME issue #883: extra physicsTicks in ThreadingType.PARALLEL.
 * <p>
 * If successful, physics time and frame time will advance at the same rate.
 *
 * @author Stephen Gold sgold@sonic.net
 */
public class TestIssue883 extends SimpleApplication {
    // *************************************************************************
    // constants and loggers

    /**
     * message logger for this class
     */
    final public static Logger logger
            = Logger.getLogger(TestIssue883.class.getName());
    // *************************************************************************
    // fields

    private static boolean firstPrint = true;
    private static float timeToNextPrint = 1f; // in seconds
    private static double frameTime; // in seconds
    private static double physicsTime; // in seconds
    // *************************************************************************
    // constructors

    /**
     * Instantiate the TestIssue883 application.
     */
    public TestIssue883() { // explicit to avoid a warning from JDK 18 javadoc
    }
    // *************************************************************************
    // new methods exposed

    /**
     * Main entry point for the TestIssue883 application.
     *
     * @param arguments array of command-line arguments (not null)
     */
    public static void main(String[] arguments) {
        Application application = new TestIssue883();
        application.start();
    }
    // *************************************************************************
    // SimpleApplication methods

    /**
     * Initialize the application.
     */
    @Override
    public void simpleInitApp() {
        BulletAppState bulletAppState = new BulletAppState() {
            @Override
            public void physicsTick(PhysicsSpace space, float timeStep) {
                physicsTime += timeStep;
            }
        };
        bulletAppState.setThreadingType(BulletAppState.ThreadingType.PARALLEL);
        stateManager.attach(bulletAppState);
    }

    /**
     * Callback invoked once per frame.
     *
     * @param tpf time interval between frame (in seconds, &ge;0)
     */
    @Override
    public void simpleUpdate(float tpf) {
        super.simpleUpdate(tpf);

        frameTime += tpf;

        if (timeToNextPrint > 0f) {
            timeToNextPrint -= tpf;
            return;
        }

        if (firstPrint) { // synchronize
            frameTime = 0.;
            physicsTime = 0.;
            firstPrint = false;
        }

        System.out.printf(
                " frameTime= %s   physicsTime= %s%n", frameTime, physicsTime);
        timeToNextPrint = 1f;
    }
}
