package eu.dnetlib.doiboost.orcid;

import java.io.IOException;
import java.net.URI;

import org.apache.commons.io.IOUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.mortbay.log.Log;

import eu.dnetlib.dhp.application.ArgumentApplicationParser;

public class OrcidDSManager {

	protected String hdfsServerUri;
	protected String workingPath;
	private String summariesFileNameTarGz;
	private String outputAuthorsPath;

	public static void main(String[] args) throws IOException, Exception {
		OrcidDSManager orcidDSManager = new OrcidDSManager();
		orcidDSManager.loadArgs(args);
		orcidDSManager.generateAuthors();
	}

	public void generateAuthors() throws Exception {
		Configuration conf = initConfigurationObject();
		FileSystem fs = initFileSystemObject(conf);
		String tarGzUri = hdfsServerUri.concat(workingPath).concat(summariesFileNameTarGz);
		Path outputPath = new Path(
			hdfsServerUri
				.concat(workingPath)
				.concat(outputAuthorsPath)
				.concat("authors.seq"));
		SummariesDecompressor.parseGzSummaries(conf, tarGzUri, outputPath);
	}

	protected Configuration initConfigurationObject() {
		// ====== Init HDFS File System Object
		Configuration conf = new Configuration();
		// Set FileSystem URI
		conf.set("fs.defaultFS", hdfsServerUri.concat(workingPath));
		// Because of Maven
		conf.set("fs.hdfs.impl", org.apache.hadoop.hdfs.DistributedFileSystem.class.getName());
		conf.set("fs.file.impl", org.apache.hadoop.fs.LocalFileSystem.class.getName());
		return conf;
	}

	protected FileSystem initFileSystemObject(Configuration conf) throws IOException {
		// Get the filesystem - HDFS
		// if there is an exception, it will be propagate
		FileSystem fs = null;
		fs = FileSystem.get(URI.create(hdfsServerUri.concat(workingPath)), conf);
		return fs;
	}

	private void loadArgs(String[] args) throws IOException, Exception {
		final ArgumentApplicationParser parser = new ArgumentApplicationParser(
			IOUtils
				.toString(
					OrcidDSManager.class
						.getResourceAsStream(
							"/eu/dnetlib/dhp/doiboost/gen_orcid_authors_from_summaries.json")));
		parser.parseArgument(args);

		hdfsServerUri = parser.get("hdfsServerUri");
		Log.info("HDFS URI: " + hdfsServerUri);
		workingPath = parser.get("workingPath");
		Log.info("Working Path: " + workingPath);
		summariesFileNameTarGz = parser.get("summariesFileNameTarGz");
		Log.info("Summaries File Name: " + summariesFileNameTarGz);
		outputAuthorsPath = parser.get("outputAuthorsPath");
		Log.info("Output Authors Data: " + outputAuthorsPath);
	}
}