package com.jsql.model.injection.strategy.blind;
   
   import com.jsql.model.InjectionModel;
   import com.jsql.model.exception.StoppedByUserSlidingException;
   import com.jsql.model.injection.strategy.blind.callable.CallableMultibit;
   import com.jsql.util.LogLevelUtil;
   import org.apache.commons.lang3.StringUtils;
   import org.apache.logging.log4j.LogManager;
   import org.apache.logging.log4j.Logger;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.List;
  import java.util.concurrent.CompletionService;
  import java.util.concurrent.ExecutionException;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Future;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import static name.fraser.neil.plaintext.diff_match_patch.Diff;
  
  public class InjectionMultibit extends AbstractInjectionBit<CallableMultibit> {
  
      /**
       * Log4j logger sent to view.
       */
      private static final Logger LOGGER = LogManager.getRootLogger();
  
      private String sourceReference;
  
      private List<Diff> diffsCommonWithAllIds = new ArrayList<>();
      private final List<List<Diff>> diffsById = new ArrayList<>();
  
      public InjectionMultibit(InjectionModel injectionModel, BlindOperator blindMode) {
          super(injectionModel, blindMode);
          
          if (this.injectionModel.isStoppedByUser()) {
              return;
          }
  
          this.sourceReference = this.callUrl("8", "multi#ref");
          ExecutorService taskExecutor = this.injectionModel.getMediatorUtils().getThreadUtil().getExecutor("CallableGetMultibitIds");
          Collection<CallableMultibit> callablesId = new ArrayList<>();
  
          for (int i = 0 ; i < 8 ; i++) {
              callablesId.add(
                  new CallableMultibit(
                      String.valueOf(i),
                      this,
                      "multi#ref~" + i
                  )
              );
          }
  
          try {
              List<Future<CallableMultibit>> futuresId = taskExecutor.invokeAll(callablesId);
              this.injectionModel.getMediatorUtils().getThreadUtil().shutdown(taskExecutor);
  
              for (Future<CallableMultibit> futureId: futuresId) {
                  List<Diff> diffsWithReference = futureId.get().getDiffsWithReference();
                  if (this.diffsCommonWithAllIds.isEmpty()) {
                      this.diffsCommonWithAllIds = new ArrayList<>(diffsWithReference);
                  } else {
                      this.diffsCommonWithAllIds.retainAll(diffsWithReference);
                  }
                  this.diffsById.add(diffsWithReference);
              }
  
              for (List<Diff> diffById : this.diffsById) {
                  diffById.removeAll(this.diffsCommonWithAllIds);
              }
          } catch (ExecutionException e) {
              LOGGER.log(LogLevelUtil.CONSOLE_JAVA, e, e);
          } catch (InterruptedException e) {
              LOGGER.log(LogLevelUtil.IGNORE, e, e);
              Thread.currentThread().interrupt();
          }
      }
  
      public CallableMultibit getCallableTest(String sqlQuery, int indexChar, int block) {
          return new CallableMultibit(
              sqlQuery,
              indexChar,
              block,
              this.injectionModel,
              this,
              "multi#" + indexChar + "." + block
          );
      }
  
      @Override
      public boolean isInjectable() throws StoppedByUserSlidingException {
          if (this.injectionModel.isStoppedByUser()) {
              throw new StoppedByUserSlidingException();
          }
          var callableBlock1 = new CallableMultibit("'a'", 1, 1, this.injectionModel, this, "multi#confirm.1");
          var callableBlock2 = new CallableMultibit("'a'", 1, 2, this.injectionModel, this, "multi#confirm.2");
          var callableBlock3 = new CallableMultibit("'a'", 1, 3, this.injectionModel, this, "multi#confirm.3");
          callableBlock1.call();
         callableBlock2.call();
         callableBlock3.call();
         return callableBlock1.getIdPage() == 3 && callableBlock2.getIdPage() == 0 && callableBlock3.getIdPage() == 1;
     }
 
     @Override
     public String getInfoMessage() {
         return "- Strategy Multibit: query 3 bits when Diffs match index in " + this.diffsById + "\n\n";
     }
 
     @Override
     public void initNextChar(
         String sqlQuery,
         List<char[]> bytes,
         AtomicInteger indexChar,
         CompletionService<CallableMultibit> taskCompletionService,
         AtomicInteger countTasksSubmitted,
         CallableMultibit currentCallable
     ) {
         indexChar.incrementAndGet();
         bytes.add(AbstractInjectionBit.getBitsUnset());
         for (int block: new int[]{ 1, 2, 3 }) {
             taskCompletionService.submit(
                 this.getCallableTest(
                     sqlQuery,
                     indexChar.get(),
                     block
                 )
             );
             countTasksSubmitted.addAndGet(1);
         }
     }
 
     @Override
     public char[] initMaskAsciiChar(List<char[]> bytes, CallableMultibit currentCallable) {
         // Bits for current url
         char[] asciiCodeMask = bytes.get(currentCallable.getCurrentIndex() - 1);
         this.extractBitsFromBlock(currentCallable, asciiCodeMask);
         return asciiCodeMask;
     }
 
     /**
      * Extract 3 bits from callable for specific block
      */
     private void extractBitsFromBlock(CallableMultibit currentCallable, char[] bits) {
         if (currentCallable.getBlock() == 1) {
             this.convertIdPageToBits(currentCallable.getIdPage(), bits, 0, 1, 2);
         } else if (currentCallable.getBlock() == 2) {
             this.convertIdPageToBits(currentCallable.getIdPage(), bits, 3, 4, 5);
         } else if (currentCallable.getBlock() == 3) {
             this.convertIdPageToBits(currentCallable.getIdPage(), bits, -1, 6,7);
         }
     }
 
     /**
      * Set bits by page id
      */
     private void convertIdPageToBits(int idPage, char[] bits, int i1, int i2, int i3) {
         String idPageBinary = Integer.toBinaryString(idPage);
         String idPageBinaryPadded = StringUtils.leftPad(idPageBinary, 3, "0");
         if (i1 > -1) {
             bits[i1] = idPageBinaryPadded.charAt(0);
         }
         bits[i2] = idPageBinaryPadded.charAt(1);
         bits[i3] = idPageBinaryPadded.charAt(2);
     }
 
 
     // Getter
 
     public String getSourceReference() {
         return this.sourceReference;
     }
 
     public List<Diff> getDiffsCommonWithAllIds() {
         return this.diffsCommonWithAllIds;
     }
 
     public List<List<Diff>> getDiffsById() {
         return this.diffsById;
     }
 }