/*
 * 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 org.apache.felix.scr.annotations.*;
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.SyncDistributionAgentMBean;
import org.apache.sling.distribution.monitor.impl.SyncDistributionAgentMBeanImpl;
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.RemoteDistributionPackageImporter;
import org.apache.sling.distribution.queue.impl.DistributionQueueProvider;
import org.apache.sling.distribution.queue.impl.DistributionQueueDispatchingStrategy;
import org.apache.sling.distribution.queue.impl.ErrorQueueDispatchingStrategy;
import org.apache.sling.distribution.queue.impl.MultipleQueueDispatchingStrategy;
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;

import java.util.*;

/**
 * An OSGi service factory for "synchronizing agents" that synchronize (pull and push) resources between remote instances.
 *
 * @see {@link DistributionAgent}
 */
@Component(metatype = true,
        label = "Apache Sling Distribution Agent - Sync Agents Factory",
        description = "OSGi configuration factory for syncing 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 SyncDistributionAgentFactory extends AbstractDistributionAgentFactory<SyncDistributionAgentMBean> {

    @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. " +
            "If not set, the calling user ResourceResolver will be used")
    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";

    @Property(cardinality = 100, label = "Passive queues", description = "List of queues that should be disabled." +
            "These queues will gather all the packages until they are removed explicitly.")
    private static final String PASSIVE_QUEUES = "passiveQueues";

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

    /**
     * endpoints property
     */
    @Property(cardinality = 100, label = "Importer Endpoints", description = "List of endpoints to which packages are sent (imported). " +
            "The list can be given as a map in case a queue should be configured for each endpoint, e.g. queueName=http://...")
    private static final String IMPORTER_ENDPOINTS = "packageImporter.endpoints";

    @Property(options = {
            @PropertyOption(name = "none", value = "none"), @PropertyOption(name = "errorQueue", value = "errorQueue")},
            value = "none",
            label = "Retry Strategy", description = "The strategy to apply after a certain number of failed retries."
    )
    private static final String RETRY_STRATEGY = "retry.strategy";

    @Property(intValue = 100, label = "Retry attempts", description = "The number of times to retry until the retry strategy is applied.")
    private static final String RETRY_ATTEMPTS = "retry.attempts";

    /**
     * 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";

    @Reference
    private Packaging packaging;

    @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 DistributionEventFactory distributionEventFactory;

    @Reference
    private SlingSettingsService settingsService;

    @Reference
    private JobManager jobManager;

    @Reference
    private ResourceResolverFactory resourceResolverFactory;

    @Reference
    private SlingRepository slingRepository;

    public SyncDistributionAgentFactory() {
        super(SyncDistributionAgentMBean.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[] passiveQueues = PropertiesUtil.toStringArray(config.get(PASSIVE_QUEUES), new String[0]);
        passiveQueues = SettingsUtils.removeEmptyEntries(passiveQueues, new String[0]);

        Object exporterEndpointsValue = config.get(EXPORTER_ENDPOINTS);
        Object importerEndpointsValue = config.get(IMPORTER_ENDPOINTS);

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

        Map<String, String> importerEndpointsMap = SettingsUtils.toUriMap(importerEndpointsValue);

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

        DistributionQueueDispatchingStrategy exportQueueStrategy;
        DistributionQueueDispatchingStrategy importQueueStrategy = null;
        DistributionPackageImporter packageImporter;
        Set<String> processingQueues = new HashSet<String>();

        Set<String> queuesMap = new TreeSet<String>();
        queuesMap.addAll(importerEndpointsMap.keySet());
        queuesMap.addAll(Arrays.asList(passiveQueues));
        processingQueues.addAll(importerEndpointsMap.keySet());
        processingQueues.removeAll(Arrays.asList(passiveQueues));

        String[] queueNames = queuesMap.toArray(new String[queuesMap.size()]);
        exportQueueStrategy = new MultipleQueueDispatchingStrategy(queueNames);

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

        packageImporter = new RemoteDistributionPackageImporter(distributionLog, transportSecretProvider,
                importerEndpointsMap, httpConfiguration);

        DistributionPackageExporter packageExporter = new RemoteDistributionPackageExporter(distributionLog, packageBuilder,
                transportSecretProvider, exporterEndpoints, pullItems, httpConfiguration);
        DistributionQueueProvider queueProvider = new MonitoringDistributionQueueProvider(new JobHandlingDistributionQueueProvider(agentName, jobManager, context), context);
        DistributionRequestType[] allowedRequests = new DistributionRequestType[]{DistributionRequestType.PULL};

        String retryStrategy = SettingsUtils.removeEmptyEntry(PropertiesUtil.toString(config.get(RETRY_STRATEGY), null));
        int retryAttepts = PropertiesUtil.toInteger(config.get(RETRY_ATTEMPTS), 100);


        if ("errorQueue".equals(retryStrategy)) {
            importQueueStrategy = new ErrorQueueDispatchingStrategy(processingQueues.toArray(new String[processingQueues.size()]));
        }


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

    }

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

}