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  package android.taobao.atlas.startup;
  
  import android.app.ActivityManager;
  import android.content.Context;
  import android.os.Build;
  import android.os.Environment;
  import android.os.Process;
  import android.taobao.atlas.startup.patch.KernalConstants;
  import android.taobao.atlas.startup.patch.KernalFileLock;
  import android.text.TextUtils;
  import android.util.Log;
  import java.io.*;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import java.util.concurrent.ConcurrentHashMap;
  
  import static android.os.Environment.MEDIA_MOUNTED;
  import static android.os.Environment.MEDIA_UNKNOWN;
  
  /**
   * Created by guanjie on 15/9/10.
   */
  public class KernalVersionManager {
  
      private static KernalVersionManager sBaseInfoManager;
      private final File  BASELINEINFO_DIR ;
      private final File  BASELINEINFO;
      private final File  BASELINEINFO_NEW;
      private String LAST_VERSIONNAME;
      private String LAST_UPDATE_BUNDLES;
      private String LAST_STORAGE_LOCATION;
      private String CURRENT_UPDATE_BUNDLES;
      private String CURRENT_VERSIONAME;
      public String CURRENT_STORAGE_LOCATION;
      private String DEXPATCH_BUNDLES;
      public String DEXPATCH_STORAGE_LOCATION;
      private HashMap<String,String> currentUpdateBundles = new HashMap<String,String>();
      public ConcurrentHashMap<String,Long> dexPatchBundles = new ConcurrentHashMap<>();
  
      public boolean cachePreVersion = false;
  
      private static class SingleTonHolder{
          private final static KernalVersionManager INSTANCE = new KernalVersionManager();
      }
  
      public static KernalVersionManager instance(){
          return SingleTonHolder.INSTANCE;
      }
  
      @Override
      public String toString(){
          return String.format("%s@%s--%s--dexPatchBundles:%s",
              LAST_VERSIONNAME,CURRENT_VERSIONAME,
              LAST_UPDATE_BUNDLES,
              TextUtils.isEmpty(DEXPATCH_BUNDLES)?"":DEXPATCH_BUNDLES
          );
      }
  
      public void reset(){
          LAST_VERSIONNAME = "";
          LAST_UPDATE_BUNDLES = "";
          LAST_STORAGE_LOCATION="";
          CURRENT_STORAGE_LOCATION="";
          DEXPATCH_STORAGE_LOCATION="";
          CURRENT_VERSIONAME = "";
          CURRENT_UPDATE_BUNDLES="";
          DEXPATCH_BUNDLES = "";
          currentUpdateBundles.clear();
          dexPatchBundles.clear();
      }
  
      private KernalVersionManager(){
          BASELINEINFO_DIR = new File(KernalConstants.baseContext.getFilesDir().getAbsolutePath() + File.separatorChar + "bundleBaseline");
          BASELINEINFO     = new File(BASELINEINFO_DIR,"updateInfo");
          BASELINEINFO_NEW = new File(BASELINEINFO_DIR,"updateInfo_new");
      }
  
      public void init(){
          KernalFileLock.getInstance().LockExclusive(BASELINEINFO_DIR);
          if(shouldSyncUpdateInThisProcess()){
              if(BASELINEINFO_NEW.exists()){
                  killChildProcesses(KernalConstants.baseContext);
                  int retry  = 3;
                  do {
                      if (BASELINEINFO.exists()) {
                          BASELINEINFO.delete();
                      }
                      retry--;
                  }while(retry>0 && BASELINEINFO.exists());
                  long length = BASELINEINFO_NEW.length();
                  retry = 3;
                  do {
                      if(BASELINEINFO_NEW.renameTo(BASELINEINFO)){
                          break;
                      }
                      retry--;
                  }while(retry>0);
                  if(length != BASELINEINFO.length()){
                      throw new RuntimeException("rename baselineinfo fail");
                  }
              }
          }
          KernalFileLock.getInstance().unLock(BASELINEINFO_DIR);
  
          String baselineVersion = "";
          String updateBundles = "";
          String lastVersionName = "";
          String lastUpdateBundles="";
          String lastStorageLocation="";
          String currentStorageLocation="";
          String dexpatchStorageLocation="";
          String dexPatchBundles="";
          if(BASELINEINFO.exists()){
              try {
                  /**
                   * 写入顺序
                   * 上一次versionname
                   * 上一次更新内容
                   * 上一次的存储地址
                   * 本次versionname
                   * 本次更新内容
                   * 本次存储地址
                   * dexpatch 更新内容
                   * dexpatch 存储地址
                   * 是否发生了回滚
                   */
                  DataInputStream input = new DataInputStream(new BufferedInputStream(new FileInputStream(BASELINEINFO)));
                  lastVersionName = input.readUTF();
                  lastUpdateBundles = input.readUTF();
                  lastStorageLocation=input.readUTF();
                  baselineVersion = input.readUTF();
                  updateBundles = input.readUTF();
                  currentStorageLocation=input.readUTF();
                  dexPatchBundles = input.readUTF();
                  dexpatchStorageLocation = input.readUTF();
                  cachePreVersion = input.readBoolean();
                  if(!TextUtils.isEmpty(dexPatchBundles) && !TextUtils.isEmpty(dexpatchStorageLocation)){
                      //external dexpatch
                      File storage = new File(dexpatchStorageLocation);
                      if(!storage.exists() || !getStorageState(storage).equals(Environment.MEDIA_MOUNTED)){
                          dexPatchBundles="";
                          dexpatchStorageLocation = "";
                      }
                  }
  
                  if(!TextUtils.isEmpty(updateBundles) && !TextUtils.isEmpty(currentStorageLocation)){
                      //no dexpatch,but external bundle update
                      File storage = new File(currentStorageLocation);
                      if(!storage.exists() || !getStorageState(storage).equals(Environment.MEDIA_MOUNTED)){
                          throw new IOException("update bundle location storage is not usable");
                      }
                  }
  
                  try {
                      input.close();
                  }catch(Throwable e){}
              } catch (Throwable e) {
                  if(KernalConstants.PROCESS.equals(KernalConstants.baseContext.getPackageName())) {
                      rollbackHardly();
                  }
                  killChildProcesses(KernalConstants.baseContext);
                  android.os.Process.killProcess(Process.myPid());
              }
          }
          LAST_VERSIONNAME = lastVersionName;
          LAST_UPDATE_BUNDLES = lastUpdateBundles;
          CURRENT_VERSIONAME = baselineVersion;
          CURRENT_UPDATE_BUNDLES= updateBundles;
          DEXPATCH_BUNDLES = dexPatchBundles;
          LAST_STORAGE_LOCATION = lastStorageLocation;
          CURRENT_STORAGE_LOCATION = currentStorageLocation;
          DEXPATCH_STORAGE_LOCATION = dexpatchStorageLocation;
          parseUpdatedBundles();
      }
  
      public void removeBaseLineInfo(){
          if(BASELINEINFO_DIR.exists()) {
              deleteDirectory(BASELINEINFO_DIR);
          }
          File bundleupdate = new File(KernalConstants.baseContext.getFilesDir(),"bundleupdate");
          if(bundleupdate.exists()) {
              deleteDirectory(bundleupdate);
          }
      }
  
      public 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 String getBaseBundleVersion(String bundleName){
          return currentUpdateBundles.get(bundleName);
      }
  
      public long getDexPatchBundleVersion(String bundleName){
          if(dexPatchBundles.containsKey(bundleName)){
              return dexPatchBundles.get(bundleName);
          }else {
              return -1;
          }
      }
  
      public Set<String> getUpdateBundles(){
          return currentUpdateBundles.keySet();
      }
  
      public String lastVersionName(){
          return LAST_VERSIONNAME;
      }
  
      public String currentVersionName(){
          return CURRENT_VERSIONAME;
      }
  
      public boolean isCachePreVersion(){
          boolean flag = Boolean.FALSE.booleanValue();
          if(flag) {
              Log.e("KernalVersionManager", "can no be inlined");
          }
          return cachePreVersion;
      }
  
      //updated
      public boolean isUpdated(String bundleName){
          if(!TextUtils.isEmpty(getBaseBundleVersion(bundleName))){
              return true;
          }
          return false;
      }
  
      //dexpatched
      public boolean isDexPatched(String bundleName){
          return getDexPatchBundleVersion(bundleName)>0;
      }
  
      public synchronized void parseUpdatedBundles(){
          if(!TextUtils.isEmpty(CURRENT_UPDATE_BUNDLES)){
              String[] bundles = CURRENT_UPDATE_BUNDLES.split(";");
              if(bundles!=null && bundles.length>0){
                  for(String bundleInfo : bundles){
                      String[] infoItems = bundleInfo.split("@");
                      currentUpdateBundles.put(infoItems[0],infoItems[1]);
                  }
              }
          }
          if(!TextUtils.isEmpty(DEXPATCH_BUNDLES)){
              String[] bundles = DEXPATCH_BUNDLES.split(";");
              if(bundles!=null && bundles.length>0){
                  for(String bundleInfo : bundles){
                      String[] infoItems = bundleInfo.split("@");
                      dexPatchBundles.put(infoItems[0],Long.parseLong(infoItems[1]));
                  }
              }
          }
      }
  
      public void rollbackHardly(){
          try {
              File baseLineDir = BASELINEINFO_DIR;
              if (!baseLineDir.exists()) {
                  baseLineDir.mkdirs();
              }
              File deprecated = new File(baseLineDir, "deprecated_mark");
              if(!deprecated.exists()) {
                  deprecated.createNewFile();
              }
              File file = BASELINEINFO;
              if(file.exists()){
                  file.delete();
              }
          }catch(Exception e){
          }
      }
  
      public void rollback(){
          File baseinfoDir = new File(BASELINEINFO_DIR.getAbsolutePath());
          if (!baseinfoDir.exists()) {
              baseinfoDir.mkdir();
          }
          try {
              /**
               * 写入顺序
               * 上一次versionname
               * 上一次更新内容
               * 本次versionname
               * 本次更新内容
               * dexpatch versionname
               * dexpatch 更新内容
               * 是否发生了回滚
               */
              DataOutputStream out = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(new File(baseinfoDir.getAbsolutePath(), "baselineInfo"))));
  
              out.writeUTF("");
              out.writeUTF("");
              out.writeUTF("");
              if(cachePreVersion){
                  out.writeUTF(LAST_VERSIONNAME);
                  out.writeUTF(LAST_UPDATE_BUNDLES);
                  out.writeUTF(LAST_STORAGE_LOCATION);
              }else {
                  out.writeUTF("");
                  out.writeUTF("");
                  out.writeUTF("");
              }
              out.writeUTF("");
              out.writeUTF("");
              out.writeBoolean(cachePreVersion);
              out.flush();
              out.close();
          } catch (Throwable e) {
              e.printStackTrace();
              rollbackHardly();
          }
  
      }
  
      public void saveDexPatchInfo(HashMap<String,String> infos,String storageLocation) throws IOException{
          for(Iterator iterator = infos.entrySet().iterator(); iterator.hasNext();)
          {
              Map.Entry entry = (java.util.Map.Entry)iterator.next();
              if(entry.getValue().equals("-1") && dexPatchBundles.containsKey(entry.getKey())){
                  //dexPatchBundles.remove(entry.getKey());
              }else{
                  dexPatchBundles.put((String)entry.getKey(),Long.parseLong((String)entry.getValue()));
              }
          }
  
          StringBuilder bundleList = new StringBuilder("");
          for(Iterator iterator = dexPatchBundles.entrySet().iterator(); iterator.hasNext();)
          {
              Map.Entry entry = (java.util.Map.Entry)iterator.next();
              if("-1".equals(infos.get(entry.getKey()))){
                  continue;
              }
              bundleList.append(entry.getKey());
              bundleList.append("@");
              bundleList.append(entry.getValue());
              bundleList.append(";");
          }
  
          File baseinfoFile = BASELINEINFO_DIR;
          if(!baseinfoFile.exists()){
              baseinfoFile.mkdirs();
          }
          File newBaselineInfoFile = new File(BASELINEINFO.getAbsolutePath());
          if(!newBaselineInfoFile.exists()){
              newBaselineInfoFile.createNewFile();
          }
  
          DataOutputStream out = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(new File(newBaselineInfoFile.getAbsolutePath()))));
          String bundleListStr = bundleList.toString();
          /**
           * 写入顺序
           * 上一次versionname
           * 上一次更新内容
           * 本次versionname
           * 本次更新内容
           * dexpatch versionname
           * dexpatch 更新内容
           * 是否发生了回滚
           */
          out.writeUTF(LAST_VERSIONNAME);
          out.writeUTF(LAST_UPDATE_BUNDLES != null ? LAST_UPDATE_BUNDLES : "");
          out.writeUTF(LAST_STORAGE_LOCATION!=null ? LAST_STORAGE_LOCATION:"");
          //如果是和基线dexPatch，由于没有做过动态部署，updateinfo文件可能不存在。
          //下次启动时，kernealbundle.patchKernalDex方法在比对版本时versionName为""，启动异常。
          out.writeUTF(TextUtils.isEmpty(CURRENT_VERSIONAME)? KernalConstants.INSTALLED_VERSIONNAME:CURRENT_VERSIONAME);
          out.writeUTF(CURRENT_UPDATE_BUNDLES);
          out.writeUTF(CURRENT_STORAGE_LOCATION);
          //dexpatch 部分
          out.writeUTF(bundleListStr);
          out.writeUTF(storageLocation!=null ? storageLocation : "");
          out.writeBoolean(cachePreVersion);
          out.flush();
          out.close();
      }
  
      public void saveUpdateInfo(String newBaselineVersion, HashMap<String,String> infos,boolean cachePreVersion,String storageLocation) throws IOException{
          StringBuilder bundleList = new StringBuilder("");
          for(Iterator iterator = infos.entrySet().iterator(); iterator.hasNext();)
          {
              Map.Entry entry = (java.util.Map.Entry)iterator.next();
              bundleList.append(entry.getKey());
              bundleList.append("@");
              bundleList.append(entry.getValue());
              bundleList.append(";");
          }
          File baseinfoFile = BASELINEINFO_DIR;
          if(!baseinfoFile.exists()){
              baseinfoFile.mkdirs();
          }
          File newBaselineInfoFile = new File(BASELINEINFO_NEW.getAbsolutePath());
          if(!newBaselineInfoFile.exists()){
              newBaselineInfoFile.createNewFile();
          }
          DataOutputStream out = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(new File(newBaselineInfoFile.getAbsolutePath()))));
          String bundleListStr = bundleList.toString();
          /**
           * 写入顺序
           * 上一次versionname
           * 上一次更新内容
           * 上一次的存储地址
           * 本次versionname
           * 本次更新内容
           * 本次存储地址
           * dexpatch 更新内容
           * dexpatch 存储地址
           * 是否发生了回滚
           */
          if(cachePreVersion) {
              out.writeUTF(!TextUtils.isEmpty(CURRENT_VERSIONAME) ? CURRENT_VERSIONAME : "");
              out.writeUTF(CURRENT_UPDATE_BUNDLES != null ? CURRENT_UPDATE_BUNDLES : "");
              out.writeUTF(CURRENT_STORAGE_LOCATION != null ? CURRENT_STORAGE_LOCATION : "");
          }else{
              out.writeUTF("");
              out.writeUTF("");
              out.writeUTF("");
          }
          out.writeUTF(newBaselineVersion);
          out.writeUTF(bundleListStr);
          out.writeUTF(storageLocation!=null ? storageLocation : "");
          //dexpatch 部分
          out.writeUTF("");
          out.writeUTF("");
          out.writeBoolean(cachePreVersion);
          out.flush();
          out.close();
      }
  
      private boolean shouldSyncUpdateInThisProcess(){
          String processName = KernalConstants.PROCESS;
          if(processName!=null &&
                  (processName.equals(KernalConstants.baseContext.getPackageName()) ||
                          processName.toLowerCase().contains(":safemode")
                  )){
              return true;
          }else{
              return false;
          }
      }
  
      public void killChildProcesses(Context context) {
          try {
              long uid = context.getApplicationInfo().uid;
              ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
              List<ActivityManager.RunningAppProcessInfo> a = am.getRunningAppProcesses();
              for (int i = 0; i < a.size(); i++) {
                  ActivityManager.RunningAppProcessInfo b = a.get(i);
                  if(b.uid == uid && !b.processName.equals(context.getPackageName())){
                      android.os.Process.killProcess(b.pid);
                  }
  
              }
          } catch (Exception e) {
  
          }
      }
  
      private String getStorageState(File path) {
          if(path.getAbsolutePath().startsWith(KernalConstants.baseContext.getFilesDir().getAbsolutePath())){
              return MEDIA_MOUNTED;
          }
          final int version = Build.VERSION.SDK_INT;
          if (version >= 19) {
              return Environment.getStorageState(path);
          }
  
          try {
              final String canonicalPath = path.getCanonicalPath();
              final String canonicalExternal = Environment.getExternalStorageDirectory()
                      .getCanonicalPath();
  
              if (canonicalPath.startsWith(canonicalExternal)) {
                  return Environment.getExternalStorageState();
              }
          } catch (IOException e) {
          }
  
          return MEDIA_UNKNOWN;
      }
  
  }
  