/*
 * Copyright (c) 2015 Cisco Systems, Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */

package org.opendaylight.controller.config.yang.netconf.mdsal.monitoring;

import java.util.Collections;
import java.util.Set;
import org.opendaylight.controller.config.util.capability.Capability;
import org.opendaylight.netconf.api.monitoring.CapabilityListener;
import org.opendaylight.netconf.api.monitoring.NetconfMonitoringService;
import org.opendaylight.netconf.mapping.api.NetconfOperation;
import org.opendaylight.netconf.mapping.api.NetconfOperationService;
import org.opendaylight.netconf.mapping.api.NetconfOperationServiceFactory;
import org.opendaylight.netconf.monitoring.GetSchema;

public class NetconfMdsalMonitoringMapperModule extends org.opendaylight.controller.config.yang.netconf.mdsal.monitoring.AbstractNetconfMdsalMonitoringMapperModule {
    public NetconfMdsalMonitoringMapperModule(final org.opendaylight.controller.config.api.ModuleIdentifier identifier, final org.opendaylight.controller.config.api.DependencyResolver dependencyResolver) {
        super(identifier, dependencyResolver);
    }

    public NetconfMdsalMonitoringMapperModule(final org.opendaylight.controller.config.api.ModuleIdentifier identifier, final org.opendaylight.controller.config.api.DependencyResolver dependencyResolver, final org.opendaylight.controller.config.yang.netconf.mdsal.monitoring.NetconfMdsalMonitoringMapperModule oldModule, final java.lang.AutoCloseable oldInstance) {
        super(identifier, dependencyResolver, oldModule, oldInstance);
    }

    @Override
    public void customValidation() {
        // add custom validation form module attributes here.
    }

    @Override
    public java.lang.AutoCloseable createInstance() {
        final NetconfMonitoringService serverMonitoringDependency = getServerMonitoringDependency();

        final MonitoringToMdsalWriter monitoringToMdsalWriter = new MonitoringToMdsalWriter(serverMonitoringDependency);
        getBindingAwareBrokerDependency().registerProvider(monitoringToMdsalWriter);

        final MdSalMonitoringMapperFactory mdSalMonitoringMapperFactory = new MdSalMonitoringMapperFactory(new MdsalMonitoringMapper(serverMonitoringDependency),
                this, monitoringToMdsalWriter);

        getAggregatorDependency().onAddNetconfOperationServiceFactory(mdSalMonitoringMapperFactory);
        return mdSalMonitoringMapperFactory;

    }

    private static class MdSalMonitoringMapperFactory implements NetconfOperationServiceFactory, AutoCloseable {

        private final NetconfOperationService operationService;
        private final NetconfMdsalMonitoringMapperModule module;
        private final MonitoringToMdsalWriter monitoringToMdsalWriter;

        private static final Set<Capability> CAPABILITIES = Collections.emptySet();
        private static final AutoCloseable AUTO_CLOSEABLE = new AutoCloseable() {
            @Override
            public void close() throws Exception {
                // NOOP
            }
        };

        public MdSalMonitoringMapperFactory(
                final NetconfOperationService operationService,
                final NetconfMdsalMonitoringMapperModule module,
                final MonitoringToMdsalWriter monitoringToMdsalWriter
        ) {
            this.operationService = operationService;
            this.module = module;
            this.monitoringToMdsalWriter = monitoringToMdsalWriter;
        }

        @Override
        public NetconfOperationService createService(final String netconfSessionIdForReporting) {
            return operationService;
        }

        @Override
        public Set<Capability> getCapabilities() {
            // TODO
            // No capabilities exposed to prevent clashes with schemas from mdsal-netconf-connector (it exposes all the schemas)
            // If the schemas exposed by mdsal-netconf-connector are filtered, this class would expose monitoring related models
            return CAPABILITIES;
        }

        @Override
        public AutoCloseable registerCapabilityListener(final CapabilityListener listener) {
            return AUTO_CLOSEABLE;
        }

        @Override
        public void close() {
            monitoringToMdsalWriter.close();
            module.getAggregatorDependency().onRemoveNetconfOperationServiceFactory(this);
        }

    }


    private static class MdsalMonitoringMapper implements NetconfOperationService {

        private final NetconfMonitoringService serverMonitoringDependency;

        public MdsalMonitoringMapper(final NetconfMonitoringService serverMonitoringDependency) {
            this.serverMonitoringDependency = serverMonitoringDependency;
        }

        @Override
        public Set<NetconfOperation> getNetconfOperations() {
            return Collections.<NetconfOperation>singleton(new GetSchema(serverMonitoringDependency));
        }

        @Override
        public void close() {
            // NOOP
        }
    }
}