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package host.anzo.commons.utils;

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.io.IOUtils;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.nio.file.*;
import java.util.HashMap;
import java.util.Map;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
 * @author ANZO
 * @since 10.03.2017
 */
@Slf4j
public class ZipUtils {
	/**
	 * Returns a zip file system
	 * @param zipFilename to construct the file system from
	 * @param create true if the zip file should be created
	 * @return a zip file system
	 * @throws IOException if an I/O error occurs creating the file system
	 */
	public static FileSystem createZipFileSystem(String zipFilename, boolean create) throws IOException {
		// convert the filename to a URI
		final Path path = Paths.get(zipFilename);
		final URI uri = URI.create("jar:file:" + path.toUri().getPath().replace(" ","%20"));

		final Map env = new HashMap<>();
		if (create) {
			env.put("create", "true");
		}
		return FileSystems.newFileSystem(uri, env);
	}

	/**
	 * Add file to zip archive
	 * @param fileName path to file
	 * @param zos zip archive output stream
	 */
	public static void putFileToZipStream(String fileName, ZipOutputStream zos) {
		try {
			final File file = new File(fileName);
			if (file.exists()) {
				zos.putNextEntry(new ZipEntry(new File(fileName).getName()));
				final byte[] bytes = Files.readAllBytes(Paths.get(fileName));
				zos.write(bytes, 0, bytes.length);
				zos.closeEntry();
			}
		}
		catch (IOException e) {
			log.error("Error while putFileToZipStream() fileName=[{}]", fileName, e);
		}
	}

	/**
	 * @param data bytes to compress
	 * @return compressed bytes
	 */
	public static byte[] compress(byte[] data) {
		if(data == null || data.length == 0)
			return null;
		try(ByteArrayOutputStream bos = new ByteArrayOutputStream();
			final GZIPOutputStream gzip = new GZIPOutputStream(bos)) {
			gzip.write(data);
			return bos.toByteArray();
		} catch(IOException e) {
			log.error("Error while compress data", e);
			return null;
		}
	}

	/**
	 * @param data bytes to decompress
	 * @return decompressed bytes
	 */
	public static byte[] decompress(byte[] data) {
		if(data == null || data.length == 0)
			return null;
		try(ByteArrayInputStream bis = new ByteArrayInputStream(data);
			GZIPInputStream gis = new GZIPInputStream(bis)) {
			return IOUtils.toByteArray(gis);
		}catch (IOException e) {
			log.error("Error while decompress data", e);
		}
		return null;
	}
}