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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.seata.metrics.registry.compact;

import java.util.Arrays;

import org.apache.seata.metrics.Clock;
import org.apache.seata.metrics.Id;
import org.apache.seata.metrics.Measurement;
import org.apache.seata.metrics.Summary;
import org.apache.seata.metrics.SystemClock;
import org.apache.seata.metrics.IdConstants;

/**
 * Compact Summary implement with SummaryValue
 *
 */
public class CompactSummary implements Summary {
    private final Id id;

    private final Id countId;

    private final Id totalId;

    private final Id tpsId;

    private volatile SummaryValue value;

    private final Clock clock;

    public CompactSummary(Id id) {
        this(id, SystemClock.INSTANCE);
    }

    public CompactSummary(Id id, Clock clock) {
        this.id = id;
        this.countId = new Id(id.getName()).withTag(id.getTags())
            .withTag(IdConstants.STATISTIC_KEY, IdConstants.STATISTIC_VALUE_COUNT);
        this.totalId = new Id(id.getName()).withTag(id.getTags())
            .withTag(IdConstants.STATISTIC_KEY, IdConstants.STATISTIC_VALUE_TOTAL);
        this.tpsId = new Id(id.getName()).withTag(id.getTags())
            .withTag(IdConstants.STATISTIC_KEY, IdConstants.STATISTIC_VALUE_TPS);
        this.value = new SummaryValue(clock.getCurrentMilliseconds());
        this.clock = clock;
    }

    @Override
    public Id getId() {
        return id;
    }

    @Override
    public void increase(long value) {
        this.value.increase(value);
    }

    @Override
    public long total() {
        return this.value.getTotal();
    }

    @Override
    public long count() {
        return this.value.getCount();
    }

    @Override
    public double tps() {
        return this.value.getTps(clock.getCurrentMilliseconds());
    }

    @Override
    public Iterable measure() {
        SummaryValue value = this.value;
        double time = clock.getCurrentMilliseconds();
        this.value = new SummaryValue(time);
        return Arrays.asList(new Measurement(countId, time, value.getCount()),
            new Measurement(totalId, time, value.getTotal()),
            new Measurement(tpsId, time, value.getTps(time)));
    }
}