/*
 * Copyright 2021 Tianmian Tech. All Rights Reserved.
 *
 * 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 com.welab.wefe.common.util;

import com.welab.wefe.common.file.decompression.dto.DecompressionResult;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;

/**
 * @author Zane
 */
public class ZipUtil {
    protected static final Logger LOG = LoggerFactory.getLogger(ZipUtil.class);
    private static final int BUFFER_SIZE = 2 * 1024;

    /**
     * unzip
     *
     * @author Zane
     */
    public static byte[] unzipBytes(byte[] data) {
        byte[] result = null;
        try {
            ByteArrayInputStream bis = new ByteArrayInputStream(data);
            ZipInputStream zip = new ZipInputStream(bis);
            while (zip.getNextEntry() != null) {
                byte[] buf = new byte[1024];
                int num = -1;
                ByteArrayOutputStream stream = new ByteArrayOutputStream();
                while ((num = zip.read(buf, 0, buf.length)) != -1) {
                    stream.write(buf, 0, num);
                }
                result = stream.toByteArray();
                stream.flush();
                stream.close();
            }
            zip.close();
            bis.close();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return result;
    }

    /**
     * zip
     */
    public static byte[] zipBytes(byte[] data) {
        byte[] result = null;
        try {
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            ZipOutputStream zip = new ZipOutputStream(bos);
            ZipEntry entry = new ZipEntry("zip");
            entry.setSize(data.length);
            zip.putNextEntry(entry);
            zip.write(data);
            zip.closeEntry();
            zip.close();
            result = bos.toByteArray();
            bos.close();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return result;
    }


    public static DecompressionResult unzipFile(String srcFilePath) throws IOException {
        return unzipFile(new File(srcFilePath), null);
    }

    public static DecompressionResult unzipFile(File srcFile) throws IOException {
        return unzipFile(srcFile, null);
    }


    /**
     * 解压 zip 文件
     * 支持压缩文件中包含多个文件
     */
    public static DecompressionResult unzipFile(File srcFile, String destDirPath) throws IOException {
        // 判断源文件是否存在
        if (!srcFile.exists()) {
            throw new RuntimeException(srcFile.getPath() + "所指文件不存在");
        }

        if (StringUtil.isEmpty(destDirPath)) {
            destDirPath = srcFile.getParent();
        }

        // 开始解压
        ZipFile zipFile = null;
        DecompressionResult result = new DecompressionResult(srcFile, destDirPath);
        try {
            zipFile = new ZipFile(srcFile);
            Enumeration<?> entries = zipFile.entries();
            while (entries.hasMoreElements()) {
                ZipEntry entry = (ZipEntry) entries.nextElement();
                // 如果是文件夹，就创建个文件夹
                if (entry.isDirectory()) {
                    String dirPath = destDirPath + "/" + entry.getName();
                    File dir = new File(dirPath);
                    dir.mkdirs();
                    result.addDir(dir);
                } else {
                    // 如果是文件，就先创建一个文件，然后用io流把内容copy过去
                    File targetFile = new File(destDirPath + "/" + entry.getName());
                    // 保证这个文件的父文件夹必须要存在
                    if (!targetFile.getParentFile().exists()) {
                        targetFile.getParentFile().mkdirs();
                    }
                    targetFile.createNewFile();
                    // 将压缩文件内容写入到这个文件中
                    InputStream is = zipFile.getInputStream(entry);
                    FileOutputStream fos = new FileOutputStream(targetFile);
                    int len;
                    byte[] buf = new byte[BUFFER_SIZE];
                    while ((len = is.read(buf)) != -1) {
                        fos.write(buf, 0, len);
                    }
                    // 关流顺序，先打开的后关闭
                    fos.close();
                    is.close();
                    result.addFile(targetFile);
                }
            }
        } finally {
            if (zipFile != null) {
                try {
                    zipFile.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        return result;
    }


}
