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  package android.taobao.atlas.startup.patch;
  
  import android.content.Context;
  import android.os.Looper;
  import android.taobao.atlas.startup.patch.releaser.BundleReleaser;
  import android.text.TextUtils;
  import dalvik.system.DexFile;
  import java.io.*;
  import java.nio.ByteBuffer;
  import java.nio.channels.FileChannel;
  import java.util.zip.ZipFile;
  
  /**
   * Created by guanjie on 15/6/4.
   */
   class KernalBundleArchive {
  
      public static final String TAG = "KernalBundleArchive";
      private static final String BUNDLE_NAME = "com_taobao_maindex.zip";
      public final static String DEXPATCH_DIR = "dexpatch/";
      /**
       * Size of reading buffers.
       */
      private static final int BUFFER_SIZE = 0x4000;
      private File bundleDir;
      /**
       * the bundle revision file location.
       */
      private File   revisionDir;
      private File   libraryDirectory;
      private DexFile[] odexFile;
      private boolean hasResources = false;
      private Context mContext;
  
      //reload
      public KernalBundleArchive(Context context, File bundleDir,String version,long dexPatchVersion,String process) throws IOException {
          mContext = context;
          this.bundleDir = bundleDir;
          if(process.equals(KernalConstants.baseContext.getPackageName())) {
              purge(version, dexPatchVersion);
          }
          if(dexPatchVersion>0){
              revisionDir = new File(bundleDir,DEXPATCH_DIR+dexPatchVersion);
          }else {
              revisionDir = new File(bundleDir, version);
          }
          if (revisionDir==null || !revisionDir.exists()) {
              throw new IOException("can not find kernal bundle");
          }
          libraryDirectory = new File(mappingInternalDirectory(),"lib");
          File bundleFile = new File(revisionDir, BUNDLE_NAME);
          boolean success = new KernalBundleRelease(revisionDir,true).release(bundleFile,true);
          if (!success||odexFile == null){
              throw new IOException("process patch failed!");
          }
      }
  
      //create
      public KernalBundleArchive(final File bundleDir, File file,String version,long dexPatchVersion) throws IOException {
          this.bundleDir = bundleDir;
          if(dexPatchVersion>0) {
              revisionDir = new File(bundleDir, DEXPATCH_DIR+dexPatchVersion);
          }else{
              revisionDir = new File(bundleDir, version);
          }
          if (!revisionDir.exists()) {
              revisionDir.mkdirs();
          }
          File bundleFile = new File(revisionDir, BUNDLE_NAME);
          if (!file.renameTo(bundleFile)) {
              copyInputStreamToFile(new FileInputStream(file), bundleFile);
          }
          ZipFile zip = new ZipFile(bundleFile);
          hasResources = false;
  
          if (zip.getEntry("resources.arsc") != null || new File(revisionDir, "newAssets/assets").exists()) {
              hasResources = true;
          }
          zip.close();
          libraryDirectory = new File(mappingInternalDirectory(), "lib");
          boolean success = new KernalBundleRelease(revisionDir,false).release(bundleFile,false);
          if (!success||odexFile == null){
              throw new IOException("process mainDex failed!");
          }
      }
  
      /**
       * This method removes all old revisions associated with the archive and keeps only the current revision.
       **/
      public void purge(String uniqueTag, final long dexPatchVersion) {
          // remove old dexpatch
          try {
              File dexPatchDir = new File(bundleDir, DEXPATCH_DIR);
              File[] dexPatchs = dexPatchDir.listFiles(new FilenameFilter() {
                  @Override
                  public boolean accept(File dir, String filename) {
                      if (dexPatchVersion > 0 && filename.equals(dexPatchVersion + "")) {
                          return false;
                      } else {
                          return true;
                      }
                  }
              });
              if (dexPatchs != null) {
                  for (File patch : dexPatchs) {
                      if(patch.isDirectory()) {
                          deleteDirectory(patch);
                      }
                  }
              }
  
              // remove old update version
              File[] dirs = bundleDir.listFiles();
              for (File dir : dirs) {
                  if (dir.isDirectory() && !dir.getName().contains("dexpatch") && !dir.getName().equals(uniqueTag)) {
                      deleteDirectory(dir);
                  }
              }
          }catch(Throwable e){
              e.printStackTrace();
          }
      }
  
  
  
      /**
       * copy input to output stream - available in several StreamUtils or Streams classes
       */
      public static void copy(InputStream input, OutputStream output) throws IOException {
          byte[] readContent = new byte[BUFFER_SIZE];
          int bytesRead;
          while ((bytesRead = input.read(readContent)) != -1) {
              output.write(readContent, 0, bytesRead);
          }
      }
  
  
      public File getLibraryDirectory(){
          return libraryDirectory;
      }
  
      public DexFile[] getOdexFile(){
          return odexFile;
      }
  
      public File getArchiveFile(){
          return new File(revisionDir,BUNDLE_NAME);
      }
  
      public File getRevisionDir(){
          return revisionDir;
      }
  
      public static void deleteDirectory(final File path) {
          final File[] files = path.listFiles();
          if (files == null){
              return;
          }
          for (int i = 0; i < files.length; i++) {
              if (files[i].isDirectory()) {
                  deleteDirectory(files[i]);
              } else {
                  files[i].delete();
              }
          }
          path.delete();
      }
  
      public static String substringAfter(String str, String separator) {
          if (TextUtils.isEmpty(str)) {
              return str;
          }
          if (separator == null) {
              return "";
          }
          int pos = str.indexOf(separator);
          if (pos == -1) {
              return "";
          }
          return str.substring(pos + separator.length());
      }
  
      public static void copyInputStreamToFile(InputStream input, File file) throws IOException {
          FileOutputStream os = null;
          FileChannel channel = null;
          try {
              // copy 文件
              os = new FileOutputStream(file);
              channel = os.getChannel();
              byte[] buffers = new byte[1024];
              int realLength;
              while ((realLength = input.read(buffers)) > 0) {
                  channel.write(ByteBuffer.wrap(buffers, 0, realLength));
              }
          } finally {
              if (input != null) try {
                  input.close();
              } catch (Exception e) {
                  e.printStackTrace();
              }
              if (channel != null) try {
                  channel.close();
              } catch (Exception e) {
                  e.printStackTrace();
              }
              if (os != null) try {
                  os.close();
              } catch (Exception e) {
                  e.printStackTrace();
              }
          }
      }
  
      private File mappingInternalDirectory(){
          if(!revisionDir.getAbsolutePath().startsWith(KernalConstants.baseContext.getFilesDir().getAbsolutePath())){
              File internalLibDir = new File(KernalConstants.baseContext.getFilesDir(),String.format("storage/com.taobao.maindex_internal/%s",revisionDir.getName()));
              return internalLibDir;
          }else{
              return revisionDir;
          }
      }
  
      /**
       * 写这个类而不用匿名内部类的原因：
       * 如果之前发生过动态部署，则再次进行update的时候饮用的第二个内部类与Archive不同于同一个dex，会引发PRE_VERIFY
       */
      public class KernalBundleRelease{
          private BundleReleaser mBundlereleaser;
          public KernalBundleRelease(File dir,boolean hasReleasedBefore) {
              mBundlereleaser = new BundleReleaser(dir,hasReleasedBefore);
          }
  
          public boolean release(final File bundleFile,final boolean start) throws IOException{
              final Boolean[] success = {true};
              mBundlereleaser.release(new BundleReleaser.ProcessCallBack() {
                  @Override
                  public void onFailed() throws IOException {
                      success[0] = false;
                      odexFile = null;
                      mBundlereleaser.close();
  
                  }
  
                  @Override
                  public void onFinish(int event) {
                      if (event == BundleReleaser.MSG_ID_DEX_OPT_DONE){
                          odexFile = mBundlereleaser.getDexFile();
                      }
                  }
  
                  @Override
                  public void onAllFinish() {
                      mBundlereleaser.close();
                  }
              },bundleFile,start);
              if(Thread.currentThread().getId()!=Looper.getMainLooper().getThread().getId()) {
                  Looper.loop();
              }
              return success[0];
          }
      }
  
  
  }
  