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/*
 * Copyright 2014-2015 the original author or authors.
 *
 * Licensed 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.glowroot.collector;

import java.util.ArrayList;
import java.util.List;

import javax.annotation.Nullable;

import org.glowroot.shaded.fasterxml.jackson.annotation.JsonCreator;
import org.glowroot.shaded.fasterxml.jackson.annotation.JsonProperty;
import org.glowroot.shaded.fasterxml.jackson.databind.JsonMappingException;
import org.glowroot.shaded.google.common.collect.Lists;

import org.glowroot.markers.UsedByJsonBinding;
import org.glowroot.transaction.model.TimerImpl;

import static org.glowroot.shaded.google.common.base.Preconditions.checkNotNull;
import static java.util.concurrent.TimeUnit.NANOSECONDS;
import static org.glowroot.common.ObjectMappers.checkRequiredProperty;
import static org.glowroot.common.ObjectMappers.orEmpty;

@UsedByJsonBinding
public class AggregateTimer {

    // only null for synthetic root timer
    private final @Nullable String name;
    private final boolean extended;
    // aggregation uses microseconds to avoid (unlikely) 292 year nanosecond rollover
    private long totalMicros;
    private long count;
    private final List nestedTimers;

    public static AggregateTimer createSyntheticRootTimer() {
        return new AggregateTimer(null, false, 0, 0, new ArrayList());
    }

    private AggregateTimer(@Nullable String name, boolean extended, long totalMicros, long count,
            List nestedTimers) {
        this.name = name;
        this.extended = extended;
        this.totalMicros = totalMicros;
        this.count = count;
        this.nestedTimers = Lists.newArrayList(nestedTimers);
    }

    public void mergeMatchedTimer(AggregateTimer aggregateTimer) {
        count += aggregateTimer.getCount();
        totalMicros += aggregateTimer.getTotalMicros();
        for (AggregateTimer toBeMergedNestedTimer : aggregateTimer.getNestedTimers()) {
            // for each to-be-merged nested node look for a match
            AggregateTimer foundMatchingNestedTimer = null;
            for (AggregateTimer nestedTimer : nestedTimers) {
                // timer names are only null for synthetic root timer
                String toBeMergedNestedTimerName = checkNotNull(toBeMergedNestedTimer.getName());
                String nestedTimerName = checkNotNull(nestedTimer.getName());
                if (toBeMergedNestedTimerName.equals(nestedTimerName)
                        && toBeMergedNestedTimer.isExtended() == nestedTimer.isExtended()) {
                    foundMatchingNestedTimer = nestedTimer;
                    break;
                }
            }
            if (foundMatchingNestedTimer == null) {
                nestedTimers.add(toBeMergedNestedTimer);
            } else {
                foundMatchingNestedTimer.mergeMatchedTimer(toBeMergedNestedTimer);
            }
        }
    }

    public @Nullable String getName() {
        return name;
    }

    public boolean isExtended() {
        return extended;
    }

    public long getTotalMicros() {
        return totalMicros;
    }

    public long getCount() {
        return count;
    }

    public List getNestedTimers() {
        return nestedTimers;
    }

    void mergeAsChildTimer(TimerImpl timer) {
        String timerName = timer.getName();
        boolean extended = timer.isExtended();
        AggregateTimer matchingAggregateTimer = null;
        for (AggregateTimer nestedTimer : nestedTimers) {
            // timer names are only null for synthetic root timer
            String nestedTimerName = checkNotNull(nestedTimer.getName());
            if (timerName.equals(nestedTimerName) && extended == nestedTimer.isExtended()) {
                matchingAggregateTimer = nestedTimer;
                break;
            }
        }
        if (matchingAggregateTimer == null) {
            matchingAggregateTimer = new AggregateTimer(timerName, timer.isExtended(), 0, 0,
                    new ArrayList());
            nestedTimers.add(matchingAggregateTimer);
        }
        if (name == null) {
            // special case for synthetic root timer
            totalMicros += NANOSECONDS.toMicros(timer.getTotal());
            count += timer.getCount();
        }
        matchingAggregateTimer.totalMicros += NANOSECONDS.toMicros(timer.getTotal());
        matchingAggregateTimer.count += timer.getCount();
        for (TimerImpl nestedTimer : timer.getNestedTimers()) {
            matchingAggregateTimer.mergeAsChildTimer(nestedTimer);
        }
    }

    @JsonCreator
    static AggregateTimer readValue(
            @JsonProperty("name") @Nullable String name,
            @JsonProperty("extended") @Nullable Boolean extended,
            @JsonProperty("totalMicros") @Nullable Long totalMicros,
            @JsonProperty("count") @Nullable Long count,
            @JsonProperty("nestedTimers") @Nullable List uncheckedNestedTimers)
                    throws JsonMappingException {
        List nestedTimers = orEmpty(uncheckedNestedTimers, "nestedTimers");
        checkRequiredProperty(totalMicros, "totalMicros");
        checkRequiredProperty(count, "count");
        return new AggregateTimer(name, orFalse(extended), totalMicros, count, nestedTimers);
    }

    private static boolean orFalse(@Nullable Boolean value) {
        return value != null && value;
    }
}