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/**
 *  Copyright 2005-2014 Red Hat, Inc.
 *
 *  Red Hat 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 io.fabric8.insight.camel.profiler;

import io.fabric8.insight.camel.base.SwitchableContainerStrategy;
import org.apache.camel.CamelContext;
import org.apache.camel.Processor;
import org.apache.camel.api.management.ManagedResource;
import org.apache.camel.model.ProcessorDefinition;
import org.apache.camel.model.ProcessorDefinitionHelper;
import org.apache.camel.model.RouteDefinition;
import org.apache.camel.model.RouteDefinitionHelper;
import org.apache.camel.spi.ProcessorFactory;
import org.apache.camel.spi.RouteContext;
import org.apache.camel.util.StringHelper;

import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

/**
 *
 */
@ManagedResource(description = "Profiler")
public class Profiler extends SwitchableContainerStrategy implements ProfilerMBean {

    private final Map, Stats> statistics = new LinkedHashMap, Stats>();
    private final Map exchanges = new ConcurrentHashMap();

    public Profiler() {
        disable();
    }

    @Override
    public void manage(CamelContext context) throws Exception {
        final ProcessorFactory delegate = context.getProcessorFactory();
        context.setProcessorFactory(new ProcessorFactory() {
            @Override
            public Processor createChildProcessor(RouteContext routeContext, ProcessorDefinition definition, boolean mandatory) throws Exception {
                Processor proc = delegate != null ? delegate.createChildProcessor(routeContext, definition, mandatory)
                        : definition.createOutputsProcessor(routeContext);
                return wrap(routeContext, definition, proc);
            }
            @Override
            public Processor createProcessor(RouteContext routeContext, ProcessorDefinition definition) throws Exception {
                Processor proc = delegate != null ? delegate.createProcessor(routeContext, definition)
                        : definition.createProcessor(routeContext);
                return wrap(routeContext, definition, proc);
            }
        });
    }

    public Processor wrap(RouteContext routeContext, ProcessorDefinition definition, Processor proc) {
        if (proc == null) {
            return null;
        }
        RouteDefinition route = ProcessorDefinitionHelper.getRoute(definition);
        if (route != null) {
            if (routeContext.getCamelContext().getNodeIdFactory() != null) {
                RouteDefinitionHelper.forceAssignIds(routeContext.getCamelContext(), route);
            }
        }
        return new ProfilerProcessor(this, proc, getStats(definition), exchanges);
    }

    public String dumpStatsAsXml(String routeId) {
        Set routes = new HashSet();
        for (ProcessorDefinition definition : statistics.keySet()) {
            RouteDefinition route = ProcessorDefinitionHelper.getRoute(definition);
            routes.add(route);
        }
        StringBuilder sb = new StringBuilder();
        sb.append("");
        for (RouteDefinition route : routes) {
            if (routeId == null || routeId.equals(route.getId())) {
                sb.append("");
                appendStats(sb, route);
                sb.append("");
            }
        }
        sb.append("");
        return sb.toString();
    }

    public String dumpAllStatsAsXml() {
        return dumpStatsAsXml(null);
    }

    protected void appendStats(StringBuilder sb, ProcessorDefinition definition) {
        Stats stats = statistics.get(definition);
        if (stats != null) {
            sb.append("");
            for (ProcessorDefinition child : statistics.keySet()) {
                if (child.getParent() == definition) {
                    appendStats(sb, child);
                }
            }
            sb.append("");
        }
    }

    public Stats getStats(ProcessorDefinition definition) {
        if (definition != null) {
            synchronized (statistics) {
                Stats stats = statistics.get(definition);
                if (stats == null) {
                    stats = new Stats(definition, getStats(definition.getParent()));
                    statistics.put(definition, stats);
                }
                return stats;
            }
        }
        return null;
    }

    public void reset() {
        for (Stats stats : statistics.values()) {
            stats.reset();
        }
    }

    public Map, Stats> getStatistics() {
        return statistics;
    }

}