/*
 * Copyright (c) 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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
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 */

package test.javafx.scene.control;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import javafx.scene.control.Alert;
import javafx.scene.control.ProgressIndicator;
import javafx.scene.Scene;
import javafx.stage.Stage;
import javafx.scene.layout.HBox;
import javafx.scene.layout.StackPane;
import com.sun.javafx.tk.Toolkit;

import org.junit.Before;
import org.junit.Test;

/**
 */
public class ProgressIndicatorTest {
    Toolkit tk;

    @Before public void setup() {
        tk = Toolkit.getToolkit();
    }

    final static int TOTAL_PROGRESS_INDICATORS = 10;
    private ArrayList<WeakReference<ProgressIndicator>> weakRefArr = 
                                      new ArrayList(TOTAL_PROGRESS_INDICATORS);


    @Test public void memoryLeakTest_JDK_8189265_stage() {
        testProgressIndicatorObjectsInStage();

        attemptGC(10);

        assertEquals(TOTAL_PROGRESS_INDICATORS, getCleanedUpObjectCount());

        weakRefArr.clear();
    }

    @Test public void memoryLeakTest_JDK_8189265_alert() {
        testProgressIndicatorObjectsInAlert();

        attemptGC(10);

        assertEquals(TOTAL_PROGRESS_INDICATORS, getCleanedUpObjectCount());

        weakRefArr.clear();
    }

    private void testProgressIndicatorObjectsInStage() {
        ProgressIndicator pi[] = new ProgressIndicator[TOTAL_PROGRESS_INDICATORS];
        HBox hb = new HBox();

        for (int i = 0; i < TOTAL_PROGRESS_INDICATORS; i++) {
            pi[i] = new ProgressIndicator();
            weakRefArr.add(i, new WeakReference<ProgressIndicator>(pi[i]));
            hb.getChildren().add(pi[i]);
        }

        Stage stage = new Stage();
        Scene scene = new Scene(hb);
        stage.setScene(scene);
        stage.show();

        tk.firePulse();

        stage.close();
        tk.firePulse();
    }

    private void testProgressIndicatorObjectsInAlert() {
        ProgressIndicator pi[] = new ProgressIndicator[TOTAL_PROGRESS_INDICATORS];
        StackPane root = new StackPane();

        for (int i = 0; i < TOTAL_PROGRESS_INDICATORS; i++) {
            pi[i] = new ProgressIndicator();
            weakRefArr.add(i, new WeakReference<ProgressIndicator>(pi[i]));
            root.getChildren().add(pi[i]);
        }

        Alert dialog = new Alert(Alert.AlertType.INFORMATION);
        dialog.getDialogPane().setContent(root);
        dialog.show();
        tk.firePulse();

        dialog.close();
        tk.firePulse();
    }

    private void attemptGC(int n) {
        // Attempt gc n times
        for (int i = 0; i < n; i++) {
            System.gc();
            System.runFinalization();
            try {
                Thread.sleep(500);
            } catch (InterruptedException e) {
                System.err.println("InterruptedException occurred during Thread.sleep()");
            }
        }
    }

    private int getCleanedUpObjectCount() {
        int count = 0;
        for (int i = 0; i < TOTAL_PROGRESS_INDICATORS; i++) {
            if (weakRefArr.get(i).get() == null) {
                count++;
            }
        }
        return count;
    }
}