/*
 * 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.sling.distribution.agent.impl;

import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import org.apache.felix.scr.annotations.Activate;
import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.ConfigurationPolicy;
import org.apache.felix.scr.annotations.Deactivate;
import org.apache.felix.scr.annotations.Property;
import org.apache.felix.scr.annotations.PropertyOption;
import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.ReferenceCardinality;
import org.apache.felix.scr.annotations.ReferencePolicy;
import org.apache.jackrabbit.vault.packaging.Packaging;
import org.apache.sling.api.resource.ResourceResolverFactory;
import org.apache.sling.commons.osgi.PropertiesUtil;
import org.apache.sling.distribution.DistributionRequestType;
import org.apache.sling.distribution.agent.spi.DistributionAgent;
import org.apache.sling.distribution.component.impl.DistributionComponentConstants;
import org.apache.sling.distribution.component.impl.SettingsUtils;
import org.apache.sling.distribution.event.impl.DistributionEventFactory;
import org.apache.sling.distribution.log.impl.DefaultDistributionLog;
import org.apache.sling.distribution.monitor.impl.MonitoringDistributionQueueProvider;
import org.apache.sling.distribution.monitor.impl.ReverseDistributionAgentMBean;
import org.apache.sling.distribution.monitor.impl.ReverseDistributionAgentMBeanImpl;
import org.apache.sling.distribution.packaging.DistributionPackageBuilder;
import org.apache.sling.distribution.packaging.DistributionPackageExporter;
import org.apache.sling.distribution.packaging.DistributionPackageImporter;
import org.apache.sling.distribution.packaging.impl.exporter.RemoteDistributionPackageExporter;
import org.apache.sling.distribution.packaging.impl.importer.LocalDistributionPackageImporter;
import org.apache.sling.distribution.queue.impl.DistributionQueueProvider;
import org.apache.sling.distribution.queue.impl.DistributionQueueDispatchingStrategy;
import org.apache.sling.distribution.queue.impl.SingleQueueDispatchingStrategy;
import org.apache.sling.distribution.queue.impl.jobhandling.JobHandlingDistributionQueueProvider;
import org.apache.sling.distribution.transport.DistributionTransportSecretProvider;
import org.apache.sling.distribution.transport.impl.HttpConfiguration;
import org.apache.sling.distribution.trigger.DistributionTrigger;
import org.apache.sling.event.jobs.JobManager;
import org.apache.sling.jcr.api.SlingRepository;
import org.apache.sling.settings.SlingSettingsService;
import org.osgi.framework.BundleContext;

/**
 * An OSGi service factory for "reverse agents" that pull resources from remote instances (e.g. from "queueing agents").
 *
 * @see {@link DistributionAgent}
 */
@Component(metatype = true,
        label = "Apache Sling Distribution Agent - Reverse Agents Factory",
        description = "OSGi configuration factory for reverse agents",
        configurationFactory = true,
        specVersion = "1.1",
        policy = ConfigurationPolicy.REQUIRE
)
@Reference(name = "triggers", referenceInterface = DistributionTrigger.class,
        policy = ReferencePolicy.DYNAMIC, cardinality = ReferenceCardinality.OPTIONAL_MULTIPLE,
        bind = "bindDistributionTrigger", unbind = "unbindDistributionTrigger")
@Property(name="webconsole.configurationFactory.nameHint", value="Agent name: {name}")
public class ReverseDistributionAgentFactory extends AbstractDistributionAgentFactory<ReverseDistributionAgentMBean> {

    @Property(label = "Name", description = "The name of the agent.")
    public static final String NAME = DistributionComponentConstants.PN_NAME;

    @Property(label = "Title", description = "The display friendly title of the agent.")
    public static final String TITLE = "title";

    @Property(label = "Details", description = "The display friendly details of the agent.")
    public static final String DETAILS = "details";

    @Property(boolValue = true, label = "Enabled", description = "Whether or not to start the distribution agent.")
    private static final String ENABLED = "enabled";


    @Property(label = "Service Name", description = "The name of the service used to access the repository.")
    private static final String SERVICE_NAME = "serviceName";

    @Property(options = {
            @PropertyOption(name = "debug", value = "debug"), @PropertyOption(name = "info", value = "info"), @PropertyOption(name = "warn", value = "warn"),
            @PropertyOption(name = "error", value = "error")},
            value = "info",
            label = "Log Level", description = "The log level recorded in the transient log accessible via http."
    )
    public static final String LOG_LEVEL = AbstractDistributionAgentFactory.LOG_LEVEL;


    @Property(boolValue = true, label = "Queue Processing Enabled", description = "Whether or not the distribution agent should process packages in the queues.")
    private static final String QUEUE_PROCESSING_ENABLED = "queue.processing.enabled";

    /**
     * endpoints property
     */
    @Property(cardinality = 100, label = "Importer Endpoints", description = "List of endpoints from which packages are received (exported).")
    private static final String EXPORTER_ENDPOINTS = "packageExporter.endpoints";

    /**
     * no. of items to poll property
     */
    @Property(intValue = 100, label = "Pull Items", description = "Number of subsequent pull requests to make.")
    private static final String PULL_ITEMS = "pull.items";

    /**
     * timeout for HTTP requests
     */
    @Property(label = "HTTP connection timeout", intValue = 10, description = "The connection timeout for HTTP requests (in seconds).")
    public static final String HTTP = "http.conn.timeout";

    @Property(name = "requestAuthorizationStrategy.target", label = "Request Authorization Strategy", description = "The target reference for the DistributionRequestAuthorizationStrategy used to authorize the access to distribution process," +
            "e.g. use target=(name=...) to bind to services by name.", value = SettingsUtils.COMPONENT_NAME_DEFAULT)
    @Reference(name = "requestAuthorizationStrategy")
    private DistributionRequestAuthorizationStrategy requestAuthorizationStrategy;

    @Property(name = "transportSecretProvider.target", label = "Transport Secret Provider", description = "The target reference for the DistributionTransportSecretProvider used to obtain the credentials used for accessing the remote endpoints, " +
            "e.g. use target=(name=...) to bind to services by name.", value = SettingsUtils.COMPONENT_NAME_DEFAULT)
    @Reference(name = "transportSecretProvider")
    private DistributionTransportSecretProvider transportSecretProvider;

    @Property(name = "packageBuilder.target", label = "Package Builder", description = "The target reference for the DistributionPackageBuilder used to create distribution packages, " +
            "e.g. use target=(name=...) to bind to services by name.", value = SettingsUtils.COMPONENT_NAME_DEFAULT)
    @Reference(name = "packageBuilder")
    private DistributionPackageBuilder packageBuilder;

    @Property(value = DEFAULT_TRIGGER_TARGET, label = "Triggers", description = "The target reference for DistributionTrigger used to trigger distribution, " +
            "e.g. use target=(name=...) to bind to services by name.")
    public static final String TRIGGERS_TARGET = "triggers.target";

    @Reference
    private Packaging packaging;

    @Reference
    private DistributionEventFactory distributionEventFactory;

    @Reference
    private SlingSettingsService settingsService;

    @Reference
    private JobManager jobManager;

    @Reference
    private ResourceResolverFactory resourceResolverFactory;

    @Reference
    private SlingRepository slingRepository;

    public ReverseDistributionAgentFactory() {
        super(ReverseDistributionAgentMBean.class);
    }

    @Activate
    protected void activate(BundleContext context, Map<String, Object> config) {
        super.activate(context, config);
    }

    protected void bindDistributionTrigger(DistributionTrigger distributionTrigger, Map<String, Object> config) {
        super.bindDistributionTrigger(distributionTrigger, config);

    }

    protected void unbindDistributionTrigger(DistributionTrigger distributionTrigger, Map<String, Object> config) {
        super.unbindDistributionTrigger(distributionTrigger, config);
    }

    @Deactivate
    protected void deactivate(BundleContext context) {
        super.deactivate(context);
    }

    @Override
    protected SimpleDistributionAgent createAgent(String agentName, BundleContext context, Map<String, Object> config, DefaultDistributionLog distributionLog) {
        String serviceName = SettingsUtils.removeEmptyEntry(PropertiesUtil.toString(config.get(SERVICE_NAME), null));
        boolean queueProcessingEnabled = PropertiesUtil.toBoolean(config.get(QUEUE_PROCESSING_ENABLED), true);

        String[] exporterEndpoints = PropertiesUtil.toStringArray(config.get(EXPORTER_ENDPOINTS), new String[0]);
        exporterEndpoints = SettingsUtils.removeEmptyEntries(exporterEndpoints);

        int pullItems = PropertiesUtil.toInteger(config.get(PULL_ITEMS), Integer.MAX_VALUE);

        Integer timeout = PropertiesUtil.toInteger(HTTP, 10) * 1000;
        HttpConfiguration httpConfiguration = new HttpConfiguration(timeout);

        DistributionPackageExporter packageExporter = new RemoteDistributionPackageExporter(distributionLog, packageBuilder,
                transportSecretProvider, exporterEndpoints, pullItems, httpConfiguration);
        DistributionPackageImporter packageImporter = new LocalDistributionPackageImporter(agentName, distributionEventFactory, packageBuilder);
        DistributionQueueProvider queueProvider = new MonitoringDistributionQueueProvider(new JobHandlingDistributionQueueProvider(agentName, jobManager, context), context);

        DistributionQueueDispatchingStrategy exportQueueStrategy = new SingleQueueDispatchingStrategy();
        DistributionQueueDispatchingStrategy importQueueStrategy = null;

        DistributionRequestType[] allowedRequests = new DistributionRequestType[]{DistributionRequestType.PULL};
        Set<String> processingQueues = new HashSet<String>();
        processingQueues.addAll(exportQueueStrategy.getQueueNames());


        return new SimpleDistributionAgent(agentName, queueProcessingEnabled, processingQueues,
                serviceName, packageImporter, packageExporter, requestAuthorizationStrategy,
                queueProvider, exportQueueStrategy, importQueueStrategy, distributionEventFactory, resourceResolverFactory, slingRepository, distributionLog, allowedRequests, null, 0);

    }

    @Override
    protected ReverseDistributionAgentMBean createMBeanAgent(DistributionAgent agent, Map<String, Object> osgiConfiguration) {
        return new ReverseDistributionAgentMBeanImpl(agent, osgiConfiguration);
    }

}