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package net.sourceforge.plantuml.code;

import java.io.ByteArrayInputStream;
import java.util.zip.Deflater;

import net.sourceforge.plantuml.code.deflate.ByteBitInputStream;
import net.sourceforge.plantuml.code.deflate.Decompressor;

public class CompressionZlib implements Compression {

	// ::comment when __CORE__
	private static boolean USE_ZOPFLI = false;
	private static final int COMPRESSION_LEVEL = 9;

	public byte[] compress(byte[] in) {
		// ::comment when __CORE__
		if (USE_ZOPFLI)
			return new CompressionZopfliZlib().compress(in);

		if (in.length == 0)
			return null;

		int len = in.length * 2;
		if (len < 1000)
			len = 1000;

		// Compress the bytes
		final Deflater compresser = new Deflater(COMPRESSION_LEVEL, true);
		compresser.setInput(in);
		compresser.finish();

		final byte[] output = new byte[len];
		final int compressedDataLength = compresser.deflate(output);
		if (compresser.finished() == false)
			return null;

		return copyArray(output, compressedDataLength);
	}

	public ByteArray decompress(byte[] input) throws NoPlantumlCompressionException {
		final byte padded[] = new byte[input.length + 256];
		System.arraycopy(input, 0, padded, 0, input.length);

		final ByteBitInputStream inputStream = new ByteBitInputStream(new ByteArrayInputStream(padded));
		try {
			return ByteArray.from(Decompressor.decompress(inputStream));
		} catch (Exception e) {
			throw new NoPlantumlCompressionException(e);
		}
	}

	private byte[] copyArray(final byte[] data, final int len) {
		final byte[] result = new byte[len];
		System.arraycopy(data, 0, result, 0, len);
		return result;
	}

}