/*
 * Copyright (c) 2013, 2019, 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 jdk.testlibrary.jfr;

import static jdk.testlibrary.Asserts.assertEquals;
import static jdk.testlibrary.Asserts.fail;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.List;

import jdk.jfr.Recording;
import jdk.jfr.RecordingState;
import jdk.jfr.consumer.RecordedEvent;
import jdk.jfr.consumer.RecordingFile;
import jdk.testlibrary.Asserts;


/**
 * Common helper class.
 */
public final class CommonHelper {

    private static RecordedEvent timeStampCounterEvent;

    public static void verifyException(VoidFunction f, String msg, Class<? extends Throwable> expectedException) throws Throwable {
        try {
            f.run();
        } catch (Throwable t) {
            if (expectedException.isAssignableFrom(t.getClass())) {
                return;
            }
            t.printStackTrace();
            assertEquals(t.getClass(), expectedException, "Wrong exception class");
        }
        fail("Missing Exception for: " + msg);
    }

    public static Recording verifyExists(long recId, List<Recording> recordings) {
        for (Recording r : recordings) {
            if (recId == r.getId()) {
                return r;
            }
        }
        Asserts.fail("Recording not found, id=" + recId);
        return null;
    }


    public static void waitForRecordingState(Recording r, RecordingState expectedState) throws Exception {
        while (r.getState() != expectedState) {
            Thread.sleep(20);
        }
    }

    public static void verifyRecordingState(Recording r, RecordingState expectedState) throws Exception {
        assertEquals(expectedState, r.getState(), "Wrong state");
    }

    public static boolean hasFastTimeEnabled() throws Exception {
        return getTimeStampCounterEvent().getValue("fastTimeEnabled");
    }

    private synchronized static RecordedEvent getTimeStampCounterEvent() throws IOException, Exception {
        if (timeStampCounterEvent == null) {
            try (Recording r = new Recording()) {
                r.enable("com.oracle.jdk.CPUTimeStampCounter");
                r.start();
                r.stop();
                Path p = Files.createTempFile("timestamo", ".jfr");
                r.dump(p);
                List<RecordedEvent> events = RecordingFile.readAllEvents(p);
                Files.deleteIfExists(p);
                if (events.isEmpty()) {
                    throw new Exception("Could not locate CPUTimeStampCounter event");
                }
                timeStampCounterEvent = events.get(0);
            }
        }
        return timeStampCounterEvent;
    }

    public static void waitForSystemCurrentMillisToChange() {
        long t = System.currentTimeMillis();
        while (t != System.currentTimeMillis()) {
            try {
                Thread.sleep(2);
            } catch (InterruptedException e) {
               throw new Error("Sleep interupted", e);
            }
        }
    }
}