package com.geostar.geostack.dib.util;

import java.io.*;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

/**
 * ZipUtils
 */
public class ZipUtils {

    private static final int BUFFER_SIZE = 1024 * 8;

    /**
     * 压缩zip包，默认包含最外层目录
     *
     * @param srcDir 压缩文件夹路径
     * @param out    压缩文件输出流
     * @throws RuntimeException 压缩失败会抛出运行时异常
     */
    public static void toZip(String srcDir, OutputStream out)
            throws RuntimeException {
        toZip(srcDir, out, false);
    }

    /**
     * 压缩zip包，当srcDir为目录，包含子文件夹或文件，并且discardParentDir为true时则丢弃最外层目录，即zip包目录层次丢弃srcDir本身
     *
     * @param srcDir           压缩文件夹路径
     * @param out              压缩文件输出流
     * @param discardParentDir 是否丢弃最外层目录
     * @throws RuntimeException
     */
    public static void toZip(String srcDir, OutputStream out, boolean discardParentDir)
            throws RuntimeException {
        System.setProperty("sun.zip.encoding", System.getProperty("sun.jnu.encoding"));
        ZipOutputStream zos = null;
        try {
            zos = new ZipOutputStream(out);
            File sourceFile = new File(srcDir);
            File[] files = sourceFile.listFiles();
            if (sourceFile.isDirectory() && files.length > 0 && discardParentDir) {
                for (File file : files) {
                    compress(file, zos, file.getName());
                }
            } else {
                compress(sourceFile, zos, sourceFile.getName());
            }
        } catch (Exception e) {
            throw new RuntimeException("zip error from ZipUtils", e);
        } finally {
            if (zos != null) {
                try {
                    zos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    /**
     * 压缩zip包，当srcDir为目录，包含子文件夹或文件，并且discardParentDir为true时则丢弃最外层目录，即zip包目录层次丢弃srcDir本身
     *
     * @param srcDir           压缩文件夹路径
     * @param zipFile          zip包文件绝对路径
     * @param discardParentDir 是否丢弃最外层目录
     * @throws RuntimeException
     * @throws FileNotFoundException
     */
    public static void toZip(String srcDir, File zipFile, boolean discardParentDir)
            throws RuntimeException, FileNotFoundException {
        System.setProperty("sun.zip.encoding", System.getProperty("sun.jnu.encoding"));
        OutputStream out = new FileOutputStream(zipFile);
        try {
            toZip(srcDir, out, discardParentDir);
        } catch (RuntimeException e) {
            e.printStackTrace();
            throw e;
        } finally {
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }


    /**
     * 压缩成ZIP 方法2
     *
     * @param srcFiles 需要压缩的文件列表
     * @param out      压缩文件输出流
     * @throws RuntimeException 压缩失败会抛出运行时异常
     */
    public static void toZip(List<File> srcFiles, OutputStream out) throws RuntimeException {
        System.setProperty("sun.zip.encoding", System.getProperty("sun.jnu.encoding"));
        ZipOutputStream zos = null;
        InputStream in = null;
        try {
            zos = new ZipOutputStream(out);
            for (File srcFile : srcFiles) {
                byte[] buf = new byte[BUFFER_SIZE];
                zos.putNextEntry(new ZipEntry(srcFile.getName()));
                int len;
                in = new FileInputStream(srcFile);
                while ((len = in.read(buf)) != -1) {
                    zos.write(buf, 0, len);
                }
                zos.closeEntry();
                in.close();
            }
        } catch (Exception e) {
            throw new RuntimeException("zip error from ZipUtils", e);
        } finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (zos != null) {
                try {
                    zos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }


    /**
     * 递归压缩方法
     *
     * @param sourceFile 源文件
     * @param zos        zip输出流
     * @param name       压缩后的名称
     * @throws Exception
     */
    private static void compress(File sourceFile, ZipOutputStream zos, String name) throws IOException {
        byte[] buf = new byte[BUFFER_SIZE];
        if (sourceFile.isFile()) {
            InputStream in = null;
            try {
                // 向zip输出流中添加一个zip实体，构造器中name为zip实体的文件的名字
                zos.putNextEntry(new ZipEntry(name));
                // copy文件到zip输出流中
                int len;
                in = new FileInputStream(sourceFile);
                while ((len = in.read(buf)) != -1) {
                    zos.write(buf, 0, len);
                }
                // Complete the entry
                zos.closeEntry();
            } catch (IOException e) {
                if (in != null) {
                    in.close();
                }
                throw new IOException(e);
            }
        } else {
            File[] listFiles = sourceFile.listFiles();
            if (listFiles == null || listFiles.length == 0) {
                // 空文件夹的处理
                zos.putNextEntry(new ZipEntry(name + "/"));
                // 没有文件，不需要文件的copy
                zos.closeEntry();
            } else {
                for (File file : listFiles) {
                    // 注意：file.getName()前面需要带上父文件夹的名字加一斜杠,
                    // 不然最后压缩包中就不能保留原来的文件结构,即：所有文件都跑到压缩包根目录下了
                    compress(file, zos, name + "/" + file.getName());
                }
            }
        }
    }

    public static void toZip(String[] in, String out) throws RuntimeException, FileNotFoundException {
        System.setProperty("sun.zip.encoding", System.getProperty("sun.jnu.encoding"));
        List<File> fileList = new ArrayList<>();
        for (String string : in) {
            fileList.add(new File(string));
        }
        OutputStream os = new FileOutputStream(new File(out));
        ZipUtils.toZip(fileList, os);
        if (os != null) {
            try {
                os.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        try {
//            String[] in = {"D:\\Program Files\\apache-maven-3.6.1\\lib\\cdi-api-1.0.jar", "D:\\Font-Awesome-4.7.0\\_config.yml"};
//            String out = "C:\\Users\\Nihaorz\\Desktop\\123.zip";
//            ZipUtils.toZip(in, out);

            File zipFile = new File("C:\\Users\\Nihaorz\\Desktop\\maven.zip");
            OutputStream os = new FileOutputStream(zipFile);
            ZipUtils.toZip("D:\\Program Files\\apache-maven-3.6.1", os, true);
            os.flush();
            os.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}