/**
 * 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 backtype.storm.utils;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;

import backtype.storm.messaging.IConnection;
import backtype.storm.messaging.TaskMessage;

public class TransferDrainer {

    private HashMap<String, ArrayList<ArrayList<TaskMessage>>> bundles = new HashMap();

    public void add(HashMap<String, ArrayList<TaskMessage>> workerTupleSetMap) {
        for (String key : workerTupleSetMap.keySet()) {

            ArrayList<ArrayList<TaskMessage>> bundle = bundles.get(key);
            if (null == bundle) {
                bundle = new ArrayList<ArrayList<TaskMessage>>();
                bundles.put(key, bundle);
            }

            ArrayList tupleSet = workerTupleSetMap.get(key);
            if (null != tupleSet && tupleSet.size() > 0) {
                bundle.add(tupleSet);
            }
        }
    }

    public void send(HashMap<String, IConnection> connections) {
        for (String hostPort : bundles.keySet()) {
            IConnection connection = connections.get(hostPort);
            if (null != connection) {
                ArrayList<ArrayList<TaskMessage>> bundle = bundles.get(hostPort);
                for (ArrayList<TaskMessage> list : bundle) {
                    connection.send(list);
                }

            }
        }
    }

    private Iterator<TaskMessage> getBundleIterator(final ArrayList<ArrayList<TaskMessage>> bundle) {

        if (null == bundle) {
            return null;
        }

        return new Iterator<TaskMessage>() {

            private int offset = 0;
            private int size = 0;
            {
                for (ArrayList<TaskMessage> list : bundle) {
                    size += list.size();
                }
            }

            private int bundleOffset = 0;
            private Iterator<TaskMessage> iter = bundle.get(bundleOffset).iterator();

            @Override
            public boolean hasNext() {
                if (offset < size) {
                    return true;
                }
                return false;
            }

            @Override
            public TaskMessage next() {
                TaskMessage msg = null;
                if (iter.hasNext()) {
                    msg = iter.next();
                } else {
                    bundleOffset++;
                    iter = bundle.get(bundleOffset).iterator();
                    msg = iter.next();
                }
                if (null != msg) {
                    offset++;
                }
                return msg;
            }

            @Override
            public void remove() {
                throw new RuntimeException("not supported");
            }
        };
    }

    public void clear() {
        bundles.clear();
    }
}