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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 *    Copyright (c) [2018] Payara Foundation and/or its affiliates. All rights reserved.
 *
 *     The contents of this file are subject to the terms of either the GNU
 *     General Public License Version 2 only ("GPL") or the Common Development
 *     and Distribution License("CDDL") (collectively, the "License").  You
 *     may not use this file except in compliance with the License.  You can
 *     obtain a copy of the License at
 *     https://github.com/payara/Payara/blob/master/LICENSE.txt
 *     See the License for the specific
 *     language governing permissions and limitations under the License.
 *
 *     When distributing the software, include this License Header Notice in each
 *     file and include the License file at glassfish/legal/LICENSE.txt.
 *
 *     GPL Classpath Exception:
 *     The Payara Foundation designates this particular file as subject to the "Classpath"
 *     exception as provided by the Payara Foundation in the GPL Version 2 section of the License
 *     file that accompanied this code.
 *
 *     Modifications:
 *     If applicable, add the following below the License Header, with the fields
 *     enclosed by brackets [] replaced by your own identifying information:
 *     "Portions Copyright [year] [name of copyright owner]"
 *
 *     Contributor(s):
 *     If you wish your version of this file to be governed by only the CDDL or
 *     only the GPL Version 2, indicate your decision by adding "[Contributor]
 *     elects to include this software in this distribution under the [CDDL or GPL
 *     Version 2] license."  If you don't indicate a single choice of license, a
 *     recipient has the option to distribute your version of this file under
 *     either the CDDL, the GPL Version 2 or to extend the choice of license to
 *     its licensees as provided above.  However, if you add GPL Version 2 code
 *     and therefore, elected the GPL Version 2 license, then the option applies
 *     only if the new code is made subject to such option by the copyright
 *     holder.
 */
package fish.payara.microprofile.faulttolerance.state;

import java.io.Serializable;
import java.time.ZonedDateTime;
import java.time.temporal.ChronoUnit;
import java.util.concurrent.atomic.AtomicLong;

/**
 * Represents the state its time amount and since when this is in charge.
 * @author Sven Diedrichsen
 */
class StateTime implements Serializable {

    private static final long serialVersionUID = 1;

    private final CircuitBreakerState.CircuitState state;
    private ZonedDateTime since;
    private final AtomicLong nanos;

    StateTime(CircuitBreakerState.CircuitState state) {
        this.state = state;
        this.since = ZonedDateTime.now();
        this.nanos = new AtomicLong(0);
    }

    /**
     * State that this represents.
     *
     * @return The state.
     */
    CircuitBreakerState.CircuitState state() {
        return this.state;
    }

    /**
     * True if this StateTime represents the provided {@link CircuitBreakerState.CircuitState}
     *
     * @param state The state to compare to.
     * @return State equals.
     */
    boolean is(CircuitBreakerState.CircuitState state) {
        return this.state.equals(state);
    }

    /**
     * The current sum of nanos.
     *
     * @return Sum of nanos.
     */
    long nanos() {
        return nanos.get();
    }

    /**
     * Updates the sum of nanos.
     *
     * @return The updates sum of nanos
     */
    long update() {
        ZonedDateTime now = ZonedDateTime.now();
        long result = this.nanos.addAndGet(ChronoUnit.NANOS.between(this.since, now));
        this.since = now;
        return result;
    }

    /**
     * Sets the time for the state to now.
     */
    void reset() {
        this.since = ZonedDateTime.now();
    }

}