/*
 * Copyright (C) 2014 Red Hat, Inc.
 *
 * 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.neutron.transcriber;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Map.Entry;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import org.opendaylight.controller.sal.binding.api.BindingAwareBroker.ProviderContext;
import org.opendaylight.neutron.spi.INeutronLoadBalancerPoolCRUD;
import org.opendaylight.neutron.spi.NeutronLoadBalancerPool;
import org.opendaylight.neutron.spi.NeutronLoadBalancerPoolMember;
import org.opendaylight.neutron.spi.NeutronLoadBalancer_SessionPersistence;
import org.opendaylight.neutron.spi.Neutron_ID;
import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.Uuid;
import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.lbaasv2.rev141002.PoolAttrs.Protocol;
import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.lbaasv2.rev141002.lbaas.attributes.Pool;
import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.lbaasv2.rev141002.lbaas.attributes.pool.Pools;
import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.lbaasv2.rev141002.lbaas.attributes.pool.PoolsBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.lbaasv2.rev141002.pool.attrs.SessionPersistenceBuilder;
import org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.rev150325.Neutron;
import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class NeutronLoadBalancerPoolInterface extends AbstractNeutronInterface<Pools, NeutronLoadBalancerPool> implements INeutronLoadBalancerPoolCRUD {
    private static final Logger LOGGER = LoggerFactory.getLogger(NeutronLoadBalancerPoolInterface.class);
    private ConcurrentMap<String, NeutronLoadBalancerPool> loadBalancerPoolDB = new ConcurrentHashMap<String, NeutronLoadBalancerPool>();


    NeutronLoadBalancerPoolInterface(ProviderContext providerContext) {
        super(providerContext);
    }

    // this method uses reflection to update an object from it's delta.

    private boolean overwrite(Object target, Object delta) {
        Method[] methods = target.getClass().getMethods();

        for (Method toMethod : methods) {
            if (toMethod.getDeclaringClass().equals(target.getClass())
                    && toMethod.getName().startsWith("set")) {

                String toName = toMethod.getName();
                String fromName = toName.replace("set", "get");

                try {
                    Method fromMethod = delta.getClass().getMethod(fromName);
                    Object value = fromMethod.invoke(delta, (Object[]) null);
                    if (value != null) {
                        toMethod.invoke(target, value);
                    }
                } catch (Exception e) {
                    LOGGER.error(e.getMessage());
                    return false;
                }
            }
        }
        return true;
    }

    @Override
    public boolean neutronLoadBalancerPoolExists(String uuid) {
        return loadBalancerPoolDB.containsKey(uuid);
    }

    @Override
    public NeutronLoadBalancerPool getNeutronLoadBalancerPool(String uuid) {
        if (!neutronLoadBalancerPoolExists(uuid)) {
            LOGGER.debug("No LoadBalancerPool has Been Defined");
            return null;
        }
        return loadBalancerPoolDB.get(uuid);
    }

    @Override
    public List<NeutronLoadBalancerPool> getAllNeutronLoadBalancerPools() {
        Set<NeutronLoadBalancerPool> allLoadBalancerPools = new HashSet<NeutronLoadBalancerPool>();
        for (Entry<String, NeutronLoadBalancerPool> entry : loadBalancerPoolDB.entrySet()) {
            NeutronLoadBalancerPool loadBalancerPool = entry.getValue();
            allLoadBalancerPools.add(loadBalancerPool);
        }
        LOGGER.debug("Exiting getLoadBalancerPools, Found {} OpenStackLoadBalancerPool", allLoadBalancerPools.size());
        List<NeutronLoadBalancerPool> ans = new ArrayList<NeutronLoadBalancerPool>();
        ans.addAll(allLoadBalancerPools);
        return ans;
    }

    @Override
    public boolean addNeutronLoadBalancerPool(NeutronLoadBalancerPool input) {
        if (neutronLoadBalancerPoolExists(input.getLoadBalancerPoolID())) {
            return false;
        }
        loadBalancerPoolDB.putIfAbsent(input.getLoadBalancerPoolID(), input);
        //TODO: add code to find INeutronLoadBalancerPoolAware services and call newtorkCreated on them
        return true;
    }

    @Override
    public boolean removeNeutronLoadBalancerPool(String uuid) {
        if (!neutronLoadBalancerPoolExists(uuid)) {
            return false;
        }
        loadBalancerPoolDB.remove(uuid);
        //TODO: add code to find INeutronLoadBalancerPoolAware services and call newtorkDeleted on them
        return true;
    }

    @Override
    public boolean updateNeutronLoadBalancerPool(String uuid, NeutronLoadBalancerPool delta) {
        if (!neutronLoadBalancerPoolExists(uuid)) {
            return false;
        }
        NeutronLoadBalancerPool target = loadBalancerPoolDB.get(uuid);
        return overwrite(target, delta);
    }

    @Override
    public boolean neutronLoadBalancerPoolInUse(String loadBalancerPoolUUID) {
        return !neutronLoadBalancerPoolExists(loadBalancerPoolUUID);
    }

    @Override
    protected Pools toMd(String uuid) {
        PoolsBuilder poolsBuilder = new PoolsBuilder();
        poolsBuilder.setUuid(toUuid(uuid));
        return poolsBuilder.build();
    }

    @Override
    protected InstanceIdentifier<Pools> createInstanceIdentifier(Pools pools) {
        return InstanceIdentifier.create(Neutron.class)
                .child(Pool.class)
                .child(Pools.class, pools.getKey());
    }

    @Override
    protected Pools toMd(NeutronLoadBalancerPool pools) {
        PoolsBuilder poolsBuilder = new PoolsBuilder();
        poolsBuilder.setAdminStateUp(pools.getLoadBalancerPoolAdminIsStateIsUp());
        if (pools.getLoadBalancerPoolDescription() != null) {
            poolsBuilder.setDescr(pools.getLoadBalancerPoolDescription());
        }
        if (pools.getNeutronLoadBalancerPoolHealthMonitorID() != null) {
            List<Uuid> listHealthMonitor = new ArrayList<Uuid>();
            listHealthMonitor.add(toUuid(pools.getNeutronLoadBalancerPoolHealthMonitorID()));
            poolsBuilder.setHealthmonitorIds(listHealthMonitor);
        }
        if (pools.getLoadBalancerPoolLbAlgorithm() != null) {
            poolsBuilder.setLbAlgorithm(pools.getLoadBalancerPoolLbAlgorithm());
        }
        if (pools.getLoadBalancerPoolListeners() != null) {
            List<Uuid> listListener = new ArrayList<Uuid>();
            for (Neutron_ID neutron_id : pools.getLoadBalancerPoolListeners()) {
                listListener.add(toUuid(neutron_id.getID()));
            }
            poolsBuilder.setListeners(listListener);
        }
        if (pools.getLoadBalancerPoolMembers() != null) {
            List<Uuid> listMember = new ArrayList<Uuid>();
            for (NeutronLoadBalancerPoolMember laodBalancerPoolMember : pools.getLoadBalancerPoolMembers()) {
                listMember.add(toUuid(laodBalancerPoolMember.getPoolMemberID()));

            }
            poolsBuilder.setMembers(listMember);
        }
        if (pools.getLoadBalancerPoolName() != null) {
            poolsBuilder.setName(pools.getLoadBalancerPoolName());
        }
        if (pools.getLoadBalancerPoolProtocol() != null) {
            poolsBuilder.setProtocol(Protocol.valueOf(pools.getLoadBalancerPoolProtocol()));
        }
        if (pools.getLoadBalancerPoolSessionPersistence() != null) {
            NeutronLoadBalancer_SessionPersistence sessionPersistence = pools.getLoadBalancerPoolSessionPersistence();
            SessionPersistenceBuilder sessionPersistenceBuilder = new SessionPersistenceBuilder();
            sessionPersistenceBuilder.setCookieName(sessionPersistence.getCookieName());
            sessionPersistenceBuilder.setType(sessionPersistence.getType());
            poolsBuilder.setSessionPersistence(sessionPersistenceBuilder.build());
        }
        if (pools.getLoadBalancerPoolTenantID() != null) {
            poolsBuilder.setTenantId(toUuid(pools.getLoadBalancerPoolTenantID()));
        }
        if (pools.getLoadBalancerPoolID() != null) {
            poolsBuilder.setUuid(toUuid(pools.getLoadBalancerPoolID()));
        } else {
            LOGGER.warn("Attempting to write neutron load balancer pool without UUID");
        }
        return poolsBuilder.build();
    }
}