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/*
 * Copyright (c) 2008-2016, Hazelcast, Inc. All Rights Reserved.
 *
 * Licensed 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 com.hazelcast.client.proxy;

import com.hazelcast.client.impl.protocol.ClientMessage;
import com.hazelcast.client.impl.protocol.codec.ClientAddPartitionLostListenerCodec;
import com.hazelcast.client.impl.protocol.codec.ClientRemovePartitionLostListenerCodec;
import com.hazelcast.client.spi.ClientListenerService;
import com.hazelcast.client.spi.ClientPartitionService;
import com.hazelcast.client.spi.EventHandler;
import com.hazelcast.client.spi.impl.ListenerMessageCodec;
import com.hazelcast.core.Member;
import com.hazelcast.core.MigrationListener;
import com.hazelcast.core.Partition;
import com.hazelcast.core.PartitionService;
import com.hazelcast.nio.Address;
import com.hazelcast.partition.PartitionLostEvent;
import com.hazelcast.partition.PartitionLostListener;

import java.util.LinkedHashSet;
import java.util.Random;
import java.util.Set;
import java.util.concurrent.TimeUnit;

/**
 * @author mdogan 5/16/13
 */
public final class PartitionServiceProxy implements PartitionService {

    private final ClientPartitionService partitionService;
    private final ClientListenerService listenerService;
    private final Random random = new Random();

    public PartitionServiceProxy(ClientPartitionService partitionService, ClientListenerService listenerService) {
        this.partitionService = partitionService;
        this.listenerService = listenerService;
    }

    @Override
    public String randomPartitionKey() {
        return Integer.toString(random.nextInt(partitionService.getPartitionCount()));
    }

    @Override
    public Set getPartitions() {
        final int partitionCount = partitionService.getPartitionCount();
        Set partitions = new LinkedHashSet(partitionCount);
        for (int i = 0; i < partitionCount; i++) {
            final Partition partition = partitionService.getPartition(i);
            partitions.add(partition);
        }
        return partitions;
    }

    @Override
    public Partition getPartition(Object key) {
        final int partitionId = partitionService.getPartitionId(key);
        return partitionService.getPartition(partitionId);
    }

    @Override
    public String addMigrationListener(MigrationListener migrationListener) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean removeMigrationListener(String registrationId) {
        throw new UnsupportedOperationException();
    }

    @Override
    public String addPartitionLostListener(PartitionLostListener partitionLostListener) {
        EventHandler handler = new ClientPartitionLostEventHandler(partitionLostListener);
        return listenerService.registerListener(createPartitionLostListenerCodec(), handler);
    }

    private ListenerMessageCodec createPartitionLostListenerCodec() {
        return new ListenerMessageCodec() {
            @Override
            public ClientMessage encodeAddRequest(boolean localOnly) {
                return ClientAddPartitionLostListenerCodec.encodeRequest(localOnly);
            }

            @Override
            public String decodeAddResponse(ClientMessage clientMessage) {
                return ClientAddPartitionLostListenerCodec.decodeResponse(clientMessage).response;
            }

            @Override
            public ClientMessage encodeRemoveRequest(String realRegistrationId) {
                return ClientRemovePartitionLostListenerCodec.encodeRequest(realRegistrationId);
            }

            @Override
            public boolean decodeRemoveResponse(ClientMessage clientMessage) {
                return ClientRemovePartitionLostListenerCodec.decodeResponse(clientMessage).response;
            }
        };
    }

    @Override
    public boolean removePartitionLostListener(String registrationId) {
        return listenerService.deregisterListener(registrationId);
    }

    @Override
    public boolean isClusterSafe() {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean isMemberSafe(Member member) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean isLocalMemberSafe() {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean forceLocalMemberToBeSafe(long timeout, TimeUnit unit) {
        throw new UnsupportedOperationException();
    }

    private static class ClientPartitionLostEventHandler extends ClientAddPartitionLostListenerCodec.AbstractEventHandler
            implements EventHandler {

        private PartitionLostListener listener;

        public ClientPartitionLostEventHandler(PartitionLostListener listener) {
            this.listener = listener;
        }

        @Override
        public void handle(int partitionId, int lostBackupCount, Address source) {
            listener.partitionLost(new PartitionLostEvent(partitionId, lostBackupCount, source));
        }

        @Override
        public void beforeListenerRegister() {

        }

        @Override
        public void onListenerRegister() {

        }
    }

}