/*

 * Copyright (c) 2012, 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.

 *

 * 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package org.graalvm.compiler.debug;

import static org.graalvm.compiler.debug.DebugCloseable.VOID_CLOSEABLE;

import java.util.concurrent.TimeUnit;

import jdk.internal.vm.compiler.collections.Pair;

final class TimerKeyImpl extends AccumulatedKey implements TimerKey {

    static class FlatTimer extends AbstractKey implements TimerKey {

        private TimerKeyImpl accm;

        FlatTimer(String nameFormat, Object nameArg1, Object nameArg2) {

            super(nameFormat, nameArg1, nameArg2);

        }

        @Override

        protected String createName(String format, Object arg1, Object arg2) {

            return super.createName(format, arg1, arg2) + FLAT_KEY_SUFFIX;

        }

        @Override

        public String toHumanReadableFormat(long value) {

            return valueToString(value);

        }

        @Override

        public TimeUnit getTimeUnit() {

            return accm.getTimeUnit();

        }

        @Override

        public DebugCloseable start(DebugContext debug) {

            return accm.start(debug);

        }

        @Override

        public Pair<String, String> toCSVFormat(long value) {

            return TimerKeyImpl.toCSVFormatHelper(value);

        }

        @Override

        public TimerKey doc(String doc) {

            throw new IllegalArgumentException("Cannot set documentation for derived key " + getName());

        }

        @Override

        public String getDocName() {

            return null;

        }

    }

    TimerKeyImpl(String nameFormat, Object nameArg1, Object nameArg2) {

        super(new FlatTimer(nameFormat, nameArg1, nameArg2), nameFormat, nameArg1, nameArg2);

        ((FlatTimer) flat).accm = this;

    }

    @Override

    public DebugCloseable start(DebugContext debug) {

        if (debug.isTimerEnabled(this)) {

            Timer result = new Timer(this, debug);

            debug.currentTimer = result;

            return result;

        } else {

            return VOID_CLOSEABLE;

        }

    }

    public static String valueToString(long value) {

        return String.format("%d.%d ms", value / 1000000, (value / 100000) % 10);

    }

    @Override

    public TimerKey getFlat() {

        return (FlatTimer) flat;

    }

    @Override

    public String toHumanReadableFormat(long value) {

        return valueToString(value);

    }

    @Override

    public TimeUnit getTimeUnit() {

        return TimeUnit.NANOSECONDS;

    }

    static final class Timer extends CloseableCounter implements DebugCloseable {

        final DebugContext debug;

        Timer(AccumulatedKey counter, DebugContext debug) {

            super(debug, debug.currentTimer, counter);

            this.debug = debug;

        }

        @Override

        public void close() {

            super.close();

            debug.currentTimer = parent;

        }

        @Override

        protected long getCounterValue() {

            return TimeSource.getTimeNS();

        }

    }

    @Override

    public Pair<String, String> toCSVFormat(long value) {

        return toCSVFormatHelper(value);

    }

    static Pair<String, String> toCSVFormatHelper(long value) {

        return Pair.create(Long.toString(value / 1000), "us");

    }

    @Override

    public TimerKey doc(String doc) {

        setDoc(doc);

        return this;

    }

}