/*

 * 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.internal.settings;

import java.util.Objects;

import java.util.Set;

import jdk.jfr.Description;

import jdk.jfr.Label;

import jdk.jfr.MetadataDefinition;

import jdk.jfr.Name;

import jdk.jfr.internal.PlatformEventType;

import jdk.jfr.internal.Control;

import jdk.jfr.internal.Type;

import jdk.jfr.internal.Utils;

@MetadataDefinition

@Label("Period")

@Description("Record event at interval")

@Name(Type.SETTINGS_PREFIX + "Period")

public final class PeriodSetting extends Control {

    private static final long typeId = Type.getTypeId(PeriodSetting.class);

    public static final String EVERY_CHUNK = "everyChunk";

    public static final String BEGIN_CHUNK = "beginChunk";

    public static final String END_CHUNK = "endChunk";

    public static final String NAME = "period";

    private final PlatformEventType eventType;

    private String value = EVERY_CHUNK;

    public PeriodSetting(PlatformEventType eventType, String defaultValue) {

        super(defaultValue);

        this.eventType = Objects.requireNonNull(eventType);

    }

    @Override

    public String combine(Set<String> values) {

        boolean beginChunk = false;

        boolean endChunk = false;

        Long min = null;

        String text = null;

        for (String value : values) {

            switch (value) {

            case EVERY_CHUNK:

                beginChunk = true;

                endChunk = true;

                break;

            case BEGIN_CHUNK:

                beginChunk = true;

                break;

            case END_CHUNK:

                endChunk = true;

                break;

            default:

                long l = Utils.parseTimespanWithInfinity(value);

                // Always accept first specified value

                if (min == null) {

                    text = value;

                    min = l;

                } else {

                    if (l < min) {

                        text = value;

                        min = l;

                    }

                }

            }

        }

        // A specified interval trumps *_CHUNK

        if (min != null) {

            return text;

        }

        if (beginChunk && !endChunk) {

            return BEGIN_CHUNK;

        }

        if (!beginChunk && endChunk) {

            return END_CHUNK;

        }

        return EVERY_CHUNK; // also default

    }

    @Override

    public void setValue(String value) {

        switch (value) {

        case EVERY_CHUNK:

            eventType.setPeriod(0, true, true);

            break;

        case BEGIN_CHUNK:

            eventType.setPeriod(0, true, false);

            break;

        case END_CHUNK:

            eventType.setPeriod(0, false, true);

            break;

        default:

            long nanos = Utils.parseTimespanWithInfinity(value);

            if (nanos != Long.MAX_VALUE) {

                eventType.setPeriod(nanos / 1_000_000, false, false);

            } else {

                eventType.setPeriod(Long.MAX_VALUE, false, false);

            }

        }

        this.value = value;

    }

    @Override

    public String getValue() {

        return value;

    }

    public static boolean isType(long typeId) {

        return PeriodSetting.typeId == typeId;

    }

}