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/*
 *  ******************************************************************************
 *  *
 *  *
 *  * This program and the accompanying materials are made available under the
 *  * terms of the Apache License, Version 2.0 which is available at
 *  * https://www.apache.org/licenses/LICENSE-2.0.
 *  *
 *  *  See the NOTICE file distributed with this work for additional
 *  *  information regarding copyright ownership.
 *  * 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.
 *  *
 *  * SPDX-License-Identifier: Apache-2.0
 *  *****************************************************************************
 */

package org.deeplearning4j.spark.data;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.spark.api.java.function.VoidFunction;
import org.apache.spark.broadcast.Broadcast;
import org.datavec.spark.util.DefaultHadoopConfig;
import org.datavec.spark.util.SerializableHadoopConfig;
import org.deeplearning4j.core.util.UIDProvider;
import org.nd4j.linalg.dataset.api.MultiDataSet;

import java.net.URI;
import java.util.Iterator;

public class MultiDataSetExportFunction implements VoidFunction> {
    private final URI outputDir;
    private final Broadcast conf;
    private String uid = null;

    private int outputCount;

    public MultiDataSetExportFunction(URI outputDir) {
        this(outputDir, null);
    }

    public MultiDataSetExportFunction(URI outputDir, Broadcast configuration) {
        this.outputDir = outputDir;
        this.conf = configuration;
    }

    @Override
    public void call(Iterator iter) throws Exception {
        String jvmuid = UIDProvider.getJVMUID();
        uid = Thread.currentThread().getId() + jvmuid.substring(0, Math.min(8, jvmuid.length()));

        Configuration c = conf == null ? DefaultHadoopConfig.get() : conf.getValue().getConfiguration();

        while (iter.hasNext()) {
            MultiDataSet next = iter.next();

            String filename = "mds_" + uid + "_" + (outputCount++) + ".bin";

            String path = outputDir.getPath();
            URI uri = new URI(path + (path.endsWith("/") || path.endsWith("\\") ? "" : "/") + filename);
            FileSystem file = FileSystem.get(uri, c);
            try (FSDataOutputStream out = file.create(new Path(uri))) {
                next.save(out);
            }
        }
    }
}