/*
 * Copyright (c) 2018-2019. Developed by Hedgecode.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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.
 */

package org.hedgecode.chess.qrcode.zip;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;

import org.hedgecode.chess.qrcode.ChessQRCodeConstants;
import org.hedgecode.chess.qrcode.ChessQRCodeException;

/**
 *
 *
 * @author Dmitry Samoshin aka gotty
 */
public class ZipContentDeflater {

    public static String deflate(String contents) throws ChessQRCodeException {
        byte[] bytes = contents.getBytes(
                ChessQRCodeConstants.CHARSET
        );
        if (bytes.length > ZipContentUtils.getMaxContentLength()) {
            throw new ChessQRCodeException(
                    ChessQRCodeException.Type.PARSE, "zip.max.length.error"
            );
        }
        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        DeflaterOutputStream zout = new DeflaterOutputStream(
                bout, new Deflater(Deflater.BEST_COMPRESSION)
        );
        try {
            try {
                zout.write(bytes);
            } finally {
                zout.close();
                bout.close();
            }
        } catch (IOException e) {
            throw new ChessQRCodeException(
                    ChessQRCodeException.Type.PARSE, "zip.deflate.write.error", e.getMessage()
            );
        }
        return ZipContentUtils.base64Encode(
                ZipContentUtils.concat(
                        bytes.length,
                        bout.toByteArray()
                )
        );
    }


    public static void main(String[] args) throws ChessQRCodeException {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < 10; ++i) {
            sb.append(i).append("bla-bla-bla").append(i);
        }
        String zipContents = ZipContentDeflater.deflate(sb.toString());
        System.out.println("Zip Contents: " + zipContents);
        System.out.println("Zip length: " + zipContents.length());
        String contents = ZipContentInflater.inflate(zipContents);
        System.out.println("Unzip Contents: " + contents);
        System.out.println("Unziip length: " + contents.length());
        System.out.println("Equals: " + sb.toString().equals(contents));
    }

}