package eu.dnetlib.dhp.oa.graph.dump;

import java.io.*;
import java.util.Optional;

import eu.dnetlib.dhp.common.MakeTarArchive;
import org.apache.commons.compress.archivers.ar.ArArchiveEntry;
import org.apache.commons.compress.archivers.ar.ArArchiveOutputStream;
import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveOutputStream;
import org.apache.commons.io.IOUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import eu.dnetlib.dhp.application.ArgumentApplicationParser;
import eu.dnetlib.dhp.oa.graph.dump.community.CommunityMap;

public class MakeTar implements Serializable {

	private static final Logger log = LoggerFactory.getLogger(MakeTar.class);

	public static void main(String[] args) throws Exception {
		String jsonConfiguration = IOUtils
			.toString(
				MakeTar.class
					.getResourceAsStream(
						"/eu/dnetlib/dhp/oa/graph/dump/input_maketar_parameters.json"));

		final ArgumentApplicationParser parser = new ArgumentApplicationParser(jsonConfiguration);
		parser.parseArgument(args);

		final String outputPath = parser.get("hdfsPath");
		log.info("hdfsPath: {}", outputPath);

		final String hdfsNameNode = parser.get("nameNode");
		log.info("nameNode: {}", hdfsNameNode);

		final String inputPath = parser.get("sourcePath");
		log.info("input path : {}", inputPath);

		final int gBperSplit = Optional.ofNullable(parser.get("splitSize"))
				.map(Integer::valueOf)
				.orElse(10);

		Configuration conf = new Configuration();
		conf.set("fs.defaultFS", hdfsNameNode);

		FileSystem fileSystem = FileSystem.get(conf);

		makeTArArchive(fileSystem, inputPath, outputPath, gBperSplit);

	}

	public static void makeTArArchive(FileSystem fileSystem, String inputPath, String outputPath, int gBperSplit) throws IOException {

		RemoteIterator<LocatedFileStatus> dir_iterator = fileSystem.listLocatedStatus(new Path(inputPath));

		while (dir_iterator.hasNext()) {
			LocatedFileStatus fileStatus = dir_iterator.next();

			Path p = fileStatus.getPath();
			String p_string = p.toString();
			String entity = p_string.substring(p_string.lastIndexOf("/") + 1);

			MakeTarArchive.tarMaxSize(fileSystem, p_string, outputPath + "/" + entity, entity, gBperSplit);
		}

	}

//	private static TarArchiveOutputStream getTar(FileSystem fileSystem, String outputPath) throws IOException {
//		Path hdfsWritePath = new Path(outputPath);
//		FSDataOutputStream fsDataOutputStream = null;
//		if (fileSystem.exists(hdfsWritePath)) {
//			fileSystem.delete(hdfsWritePath, true);
//
//		}
//		fsDataOutputStream = fileSystem.create(hdfsWritePath);
//
//		return new TarArchiveOutputStream(fsDataOutputStream.getWrappedStream());
//	}
//
//	private static void writeMaxSize(FileSystem fileSystem, String inputPath, String outputPath, String dir_name,
//		int gBperSplit) throws IOException {
//		final long bytesPerSplit = 1024L * 1024L * 1024L * gBperSplit;
//
//		long sourceSize = fileSystem.getContentSummary(new Path(inputPath)).getSpaceConsumed();
//
//		final long numberOfSplits = sourceSize / bytesPerSplit;
//
//		if (numberOfSplits < 2) {
//			write(fileSystem, inputPath, outputPath + ".tar", dir_name);
//		} else {
//			int partNum = 0;
//
//			RemoteIterator<LocatedFileStatus> fileStatusListIterator = fileSystem
//				.listFiles(
//					new Path(inputPath), true);
//			boolean next = fileStatusListIterator.hasNext();
//			while (sourceSize > 0 && next) {
//				TarArchiveOutputStream ar = getTar(fileSystem, outputPath + "_" + (partNum + 1) + ".tar");
//
//				long current_size = 0;
//				while (next && current_size < bytesPerSplit) {
//					LocatedFileStatus fileStatus = fileStatusListIterator.next();
//
//					Path p = fileStatus.getPath();
//					String p_string = p.toString();
//					if (!p_string.endsWith("_SUCCESS")) {
//						String name = p_string.substring(p_string.lastIndexOf("/") + 1);
//						if (name.trim().equalsIgnoreCase("communities_infrastructures")) {
//							name = "communities_infrastructures.json";
//						}
//						TarArchiveEntry entry = new TarArchiveEntry(dir_name + "/" + name);
//						entry.setSize(fileStatus.getLen());
//						current_size += fileStatus.getLen();
//						ar.putArchiveEntry(entry);
//
//						InputStream is = fileSystem.open(fileStatus.getPath());
//
//						BufferedInputStream bis = new BufferedInputStream(is);
//
//						int count;
//						byte data[] = new byte[1024];
//						while ((count = bis.read(data, 0, data.length)) != -1) {
//							ar.write(data, 0, count);
//						}
//						bis.close();
//						ar.closeArchiveEntry();
//
//					}
//					next = fileStatusListIterator.hasNext();
//
//				}
//				sourceSize = sourceSize - current_size;
//				partNum += 1;
//				ar.close();
//			}
//
//		}
//
//	}
//
//	private static void write(FileSystem fileSystem, String inputPath, String outputPath, String dir_name)
//		throws IOException {
//
//		Path hdfsWritePath = new Path(outputPath);
//		FSDataOutputStream fsDataOutputStream = null;
//		if (fileSystem.exists(hdfsWritePath)) {
//			fileSystem.delete(hdfsWritePath, true);
//
//		}
//		fsDataOutputStream = fileSystem.create(hdfsWritePath);
//
//		TarArchiveOutputStream ar = new TarArchiveOutputStream(fsDataOutputStream.getWrappedStream());
//
//		RemoteIterator<LocatedFileStatus> fileStatusListIterator = fileSystem
//			.listFiles(
//				new Path(inputPath), true);
//
//		while (fileStatusListIterator.hasNext()) {
//			LocatedFileStatus fileStatus = fileStatusListIterator.next();
//
//			Path p = fileStatus.getPath();
//			String p_string = p.toString();
//			if (!p_string.endsWith("_SUCCESS")) {
//				String name = p_string.substring(p_string.lastIndexOf("/") + 1);
//				if (name.trim().equalsIgnoreCase("communities_infrastructures")) {
//					name = "communities_infrastructures.json";
//				}
//				TarArchiveEntry entry = new TarArchiveEntry(dir_name + "/" + name);
//				entry.setSize(fileStatus.getLen());
//				ar.putArchiveEntry(entry);
//
//				InputStream is = fileSystem.open(fileStatus.getPath());
//
//				BufferedInputStream bis = new BufferedInputStream(is);
//
//				int count;
//				byte data[] = new byte[1024];
//				while ((count = bis.read(data, 0, data.length)) != -1) {
//					ar.write(data, 0, count);
//				}
//				bis.close();
//				ar.closeArchiveEntry();
//
//			}
//
//		}
//
//		ar.close();
//	}

}