/*
 * 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.camel.component.micrometer.messagehistory;

import java.util.concurrent.TimeUnit;

import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.Tags;
import org.apache.camel.CamelContext;
import org.apache.camel.CamelContextAware;
import org.apache.camel.Exchange;
import org.apache.camel.Message;
import org.apache.camel.MessageHistory;
import org.apache.camel.NamedNode;
import org.apache.camel.NonManagedService;
import org.apache.camel.Route;
import org.apache.camel.RuntimeCamelException;
import org.apache.camel.StaticService;
import org.apache.camel.component.micrometer.MicrometerUtils;
import org.apache.camel.spi.MessageHistoryFactory;
import org.apache.camel.support.PatternHelper;
import org.apache.camel.support.service.ServiceSupport;

import static org.apache.camel.component.micrometer.MicrometerConstants.METRICS_REGISTRY_NAME;
import static org.apache.camel.component.micrometer.MicrometerConstants.SERVICE_NAME;

/**
 * A factory to setup and use {@link MicrometerMessageHistory} as message history implementation.
 */
public class MicrometerMessageHistoryFactory extends ServiceSupport implements CamelContextAware, StaticService, NonManagedService, MessageHistoryFactory {

    private CamelContext camelContext;
    private MeterRegistry meterRegistry;
    private boolean copyMessage;
    private String nodePattern;
    private boolean prettyPrint = true;
    private TimeUnit durationUnit = TimeUnit.MILLISECONDS;
    private MicrometerMessageHistoryNamingStrategy namingStrategy = MicrometerMessageHistoryNamingStrategy.DEFAULT;

    @Override
    public CamelContext getCamelContext() {
        return camelContext;
    }

    @Override
    public void setCamelContext(CamelContext camelContext) {
        this.camelContext = camelContext;
    }

    public MeterRegistry getMeterRegistry() {
        return meterRegistry;
    }

    /**
     * To use a specific {@link MeterRegistry} instance.
     * <p/>
     * If no instance has been configured, then Camel will create a shared instance to be used.
     */
    public void setMeterRegistry(MeterRegistry meterRegistry) {
        this.meterRegistry = meterRegistry;
    }

    public boolean isPrettyPrint() {
        return prettyPrint;
    }

    /**
     * Whether to use pretty print when outputting JSon
     */
    public void setPrettyPrint(boolean prettyPrint) {
        this.prettyPrint = prettyPrint;
    }

    public TimeUnit getDurationUnit() {
        return durationUnit;
    }

    /**
     * Sets the time unit to use for timing the duration of processing a message in the route
     */
    public void setDurationUnit(TimeUnit durationUnit) {
        this.durationUnit = durationUnit;
    }

    public MicrometerMessageHistoryNamingStrategy getNamingStrategy() {
        return namingStrategy;
    }

    /**
     * Sets the naming strategy for message history meter names
     */
    public void setNamingStrategy(MicrometerMessageHistoryNamingStrategy namingStrategy) {
        this.namingStrategy = namingStrategy;
    }

    @Override
    public boolean isCopyMessage() {
        return copyMessage;
    }

    @Override
    public void setCopyMessage(boolean copyMessage) {
        this.copyMessage = copyMessage;
    }

    @Override
    public String getNodePattern() {
        return nodePattern;
    }

    @Override
    public void setNodePattern(String nodePattern) {
        this.nodePattern = nodePattern;
    }

    @Override
    public MessageHistory newMessageHistory(String routeId, NamedNode namedNode, long timestamp, Exchange exchange) {
        if (nodePattern != null) {
            String name = namedNode.getShortName();
            String[] parts = nodePattern.split(",");
            for (String part : parts) {
                boolean match = PatternHelper.matchPattern(name, part);
                if (!match) {
                    return null;
                }
            }
        }

        Message msg = null;
        if (copyMessage) {
            msg = exchange.getMessage().copy();
        }

        Route route = camelContext.getRoute(routeId);
        if (route != null) {
            return new MicrometerMessageHistory(getMeterRegistry(), route, namedNode, getNamingStrategy(), timestamp, msg);
        } else {
            return null;
        }
    }

    @Override
    protected void doStart() throws Exception {
        if (meterRegistry == null) {
            meterRegistry = MicrometerUtils.getOrCreateMeterRegistry(camelContext.getRegistry(), METRICS_REGISTRY_NAME);
        }

        try {
            MicrometerMessageHistoryService messageHistoryService = camelContext.hasService(MicrometerMessageHistoryService.class);
            if (messageHistoryService == null) {
                messageHistoryService = new MicrometerMessageHistoryService();
                messageHistoryService.setMeterRegistry(getMeterRegistry());
                messageHistoryService.setPrettyPrint(isPrettyPrint());
                messageHistoryService.setDurationUnit(getDurationUnit());
                messageHistoryService.setMatchingTags(Tags.of(SERVICE_NAME, MicrometerMessageHistoryService.class.getSimpleName()));
                camelContext.addService(messageHistoryService);
            }
        } catch (Exception e) {
            throw RuntimeCamelException.wrapRuntimeCamelException(e);
        }

    }

    @Override
    protected void doStop() {
        // noop
    }
}