/*

 * Copyright (c) 2016, 2018, 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.jfr.consumer;

import java.time.DateTimeException;

import java.time.ZoneOffset;

import jdk.jfr.internal.LogLevel;

import jdk.jfr.internal.LogTag;

import jdk.jfr.internal.Logger;

import jdk.jfr.internal.consumer.ChunkHeader;

/**

 * Converts ticks to nanoseconds

 */

final class TimeConverter {

    private final long startTicks;

    private final long startNanos;

    private final double divisor;

    private final ZoneOffset zoneOffet;

    TimeConverter(ChunkHeader chunkHeader, int rawOffset) {

        this.startTicks = chunkHeader.getStartTicks();

        this.startNanos = chunkHeader.getStartNanos();

        this.divisor = chunkHeader.getTicksPerSecond() / 1000_000_000L;

        this.zoneOffet = zoneOfSet(rawOffset);

    }

    private ZoneOffset zoneOfSet(int rawOffset) {

        try {

            return ZoneOffset.ofTotalSeconds(rawOffset / 1000);

        } catch (DateTimeException dte) {

            Logger.log(LogTag.JFR_SYSTEM_PARSER, LogLevel.INFO, "Could not create ZoneOffset from raw offset " + rawOffset);

        }

        return ZoneOffset.UTC;

    }

    public long convertTimestamp(long ticks) {

        return startNanos + (long) ((ticks - startTicks) / divisor);

    }

    public long convertTimespan(long ticks) {

        return (long) (ticks / divisor);

    }

    public ZoneOffset getZoneOffset() {

        return zoneOffet;

    }

}