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  package com.taobao.android.builder.tools.multidex.mutli;
  
  import com.android.build.gradle.internal.api.AppVariantContext;
  import com.android.builder.packaging.JarMerger;
  import com.taobao.android.builder.extension.MultiDexConfig;
  import com.taobao.android.builder.tools.FileNameUtils;
  import com.taobao.android.builder.tools.JarUtils;
  import com.taobao.android.builder.tools.multidex.dex.DexMerger;
  import org.apache.commons.io.FileUtils;
  import org.apache.commons.io.IOUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.*;
  import java.util.*;
  import java.util.jar.JarEntry;
  import java.util.jar.JarFile;
  import java.util.jar.JarOutputStream;
  import java.util.zip.ZipEntry;
  
  /**
   * Created by wuzhong on 2017/6/16.
   */
  public class JarRefactor {
  
      private static Logger logger = LoggerFactory.getLogger(JarRefactor.class);
  
      private AppVariantContext appVariantContext;
      private MultiDexConfig multiDexConfig;
      private boolean splitJar = false;
  
      public static final int MAX_CLASSES = 3000;
  
      public JarRefactor(AppVariantContext appVariantContext,
                         MultiDexConfig multiDexConfig) {
          this.appVariantContext = appVariantContext;
          this.multiDexConfig = multiDexConfig;
      }
  
      public Collection<File> repackageJarList(Collection<File> files, File mainDexListFile, boolean release) throws IOException {
  
  
          List<String> mainDexList = new MainDexLister(appVariantContext, multiDexConfig).getMainDexList(files,mainDexListFile);
          if (release){
              return generateFirstDexJar(mainDexList,files);
  
          }else {
              return null;
          }
  
  
      }
  
      private Collection<File> generateFirstDexJar(List<String>mainDexList,Collection<File> files)throws IOException {
  
          List<File> jarList = new ArrayList<>();
          List<File> folderList = new ArrayList<>();
          for (File file : files) {
              if (file.isDirectory()) {
                  folderList.add(file);
              } else {
                  jarList.add(file);
              }
          }
  
          File dir = new File(appVariantContext.getScope().getGlobalScope().getIntermediatesDir(),
                  "fastmultidex/" + appVariantContext.getVariantName());
          FileUtils.deleteDirectory(dir);
          dir.mkdirs();
  
          if (!folderList.isEmpty()) {
              File mergedJar = new File(dir, "jarmerging/combined.jar");
              mergedJar.getParentFile().mkdirs();
              mergedJar.delete();
              mergedJar.createNewFile();
              JarMerger jarMerger = new JarMerger(mergedJar.toPath());
              for (File folder : folderList) {
                  jarMerger.addDirectory(folder.toPath());
              }
              jarMerger.close();
              if (mergedJar.length() > 0) {
                  jarList.add(mergedJar);
              }
          }
  
          List<File> result = new ArrayList<>();
          File maindexJar = new File(dir, DexMerger.FASTMAINDEX_JAR + ".jar");
  
          JarOutputStream mainJarOuputStream = new JarOutputStream(
                  new BufferedOutputStream(new FileOutputStream(maindexJar)));
  
          //First order
          Collections.sort(jarList, new NameComparator());
  
          for (File jar : jarList) {
              File outJar = new File(dir, FileNameUtils.getUniqueJarName(jar) + ".jar");
  
              result.add(outJar);
              JarFile jarFile = new JarFile(jar);
              JarOutputStream jos = new JarOutputStream(new BufferedOutputStream(new FileOutputStream(outJar)));
              Enumeration<JarEntry> jarFileEntries = jarFile.entries();
  
              List<String> pathList = new ArrayList<>();
              while (jarFileEntries.hasMoreElements()) {
                  JarEntry ze = jarFileEntries.nextElement();
                  String pathName = ze.getName();
                  if (mainDexList.contains(pathName)) {
                      copyStream(jarFile.getInputStream(ze), mainJarOuputStream, ze, pathName);
                      pathList.add(pathName);
                  }
              }
  
              if (!pathList.isEmpty()) {
                  jarFileEntries = jarFile.entries();
                  while (jarFileEntries.hasMoreElements()) {
                      JarEntry ze = jarFileEntries.nextElement();
                      String pathName = ze.getName();
                      if (!pathList.contains(pathName)) {
                          copyStream(jarFile.getInputStream(ze), jos, ze, pathName);
                      }
                  }
              }
  
              jarFile.close();
              IOUtils.closeQuietly(jos);
  
              if (pathList.isEmpty()) {
                  FileUtils.copyFile(jar, outJar);
              }
              if (!appVariantContext.getAtlasExtension().getTBuildConfig().isFastProguard() && files.size() == 1){
                  JarUtils.splitMainJar(result,outJar,1,MAX_CLASSES);
              }
          }
  
          IOUtils.closeQuietly(mainJarOuputStream);
  
          Collections.sort(result, new NameComparator());
  
          result.add(0, maindexJar);
  
          return result;
      }
  
  
  
      private void copyStream(InputStream inputStream, JarOutputStream jos, JarEntry ze, String pathName) {
          try {
  
              ZipEntry newEntry = new ZipEntry(pathName);
              // Make sure there is date and time set.
              if (ze.getTime() != -1) {
                  newEntry.setTime(ze.getTime());
                  newEntry.setCrc(ze.getCrc()); // If found set it into output file.
              }
              jos.putNextEntry(newEntry);
              IOUtils.copy(inputStream, jos);
              IOUtils.closeQuietly(inputStream);
          } catch (Exception e) {
              //throw new GradleException("copy stream exception", e);
              //e.printStackTrace();
              logger.error("copy stream exception >>> " + pathName + " >>>" + e.getMessage());
          }
      }
  
  }
  