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.AbstractCallableBit;
   import com.jsql.model.injection.strategy.blind.callable.CallableVendor;
   import com.jsql.model.injection.vendor.model.Vendor;
   import com.jsql.model.injection.vendor.model.VendorYaml;
   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.ExecutionException;
  import java.util.concurrent.ExecutorService;
  import java.util.concurrent.Future;
  
  import static name.fraser.neil.plaintext.diff_match_patch.Diff;
  
  public class InjectionVendor {
  
      private static final Logger LOGGER = LogManager.getRootLogger();
  
      private String blankFalseMark;  // Source code of the FALSE web page (e.g. ?id=-123456789)
  
      private List<Diff> constantTrueMark = new ArrayList<>();
  
      protected final InjectionModel injectionModel;
  
      private final List<String> falsy;
  
      public InjectionVendor(InjectionModel injectionModel, String vendorSpecificWithOperator, Vendor vendor) {
          this.injectionModel = injectionModel;
  
          List<String> truthy = this.injectionModel.getMediatorVendor().getVendor().instance().getTruthyBit();
          this.falsy = this.injectionModel.getMediatorVendor().getVendor().instance().getFalsyBit();
          
          // No blind
          if (truthy.isEmpty() || this.injectionModel.isStoppedByUser()) {
              return;
          }
          
          // Call the SQL request which must be FALSE (usually ?id=-123456879)
          this.blankFalseMark = this.callUrl(
              StringUtils.EMPTY,
              "vendor:" + vendor
          );
  
          // Concurrent calls to the FALSE statements,
          // it will use inject() from the model
          ExecutorService taskExecutor = this.injectionModel.getMediatorUtils().getThreadUtil().getExecutor("CallableVendorTagTrue");
          Collection<CallableVendor> listCallableTagTrue = new ArrayList<>();
          for (String urlTest: truthy) {
              listCallableTagTrue.add(
                  new CallableVendor(
                      vendorSpecificWithOperator.replace(VendorYaml.TEST, urlTest),
                      this,
                      "vendor#true"
                  )
              );
          }
          
          // Delete junk from the results of FALSE statements,
          // keep only opcodes found in each and every FALSE pages.
          // Allow the user to stop the loop
          try {
              List<Future<CallableVendor>> listTagTrue = taskExecutor.invokeAll(listCallableTagTrue);
              this.injectionModel.getMediatorUtils().getThreadUtil().shutdown(taskExecutor);
              
              for (var i = 1 ; i < listTagTrue.size() ; i++) {
                  if (this.injectionModel.isStoppedByUser()) {
                      return;
                  }
                  if (this.constantTrueMark.isEmpty()) {
                      this.constantTrueMark = listTagTrue.get(i).get().getOpcodes();
                  } else {
                      this.constantTrueMark.retainAll(listTagTrue.get(i).get().getOpcodes());
                  }
              }
          } catch (ExecutionException e) {
              LOGGER.log(LogLevelUtil.CONSOLE_JAVA, e, e);
          } catch (InterruptedException e) {
              LOGGER.log(LogLevelUtil.IGNORE, e, e);
              Thread.currentThread().interrupt();
          }
          
          this.initFalseMarks(vendorSpecificWithOperator);
      }
      
      private void initFalseMarks(String vendorSpecificWithMode) {
          // Concurrent calls to the TRUE statements,
          // it will use inject() from the model.
          ExecutorService taskExecutor = this.injectionModel.getMediatorUtils().getThreadUtil().getExecutor("CallableVendorTagFalse");
          Collection<CallableVendor> listCallableTagFalse = new ArrayList<>();
          for (String urlTest: this.falsy) {
              listCallableTagFalse.add(
                 new CallableVendor(
                     vendorSpecificWithMode.replace(VendorYaml.TEST, urlTest),
                     this,
                     "vendor#false"
                 )
             );
         }
         
         // Remove TRUE opcodes in the FALSE opcodes, because
         // a significant FALSE statement shouldn't contain any TRUE opcode.
         // Allow the user to stop the loop.
         try {
             List<Future<CallableVendor>> listTagFalse = taskExecutor.invokeAll(listCallableTagFalse);
             this.injectionModel.getMediatorUtils().getThreadUtil().shutdown(taskExecutor);
             for (Future<CallableVendor> falseTag: listTagFalse) {
                 if (this.injectionModel.isStoppedByUser()) {
                     return;
                 }
                 this.constantTrueMark.removeAll(falseTag.get().getOpcodes());
             }
         } catch (ExecutionException e) {
             LOGGER.log(LogLevelUtil.CONSOLE_JAVA, e, e);
         } catch (InterruptedException e) {
             LOGGER.log(LogLevelUtil.IGNORE, e, e);
             Thread.currentThread().interrupt();
         }
     }
 
     public boolean isInjectable(String vendorSpecificWithMode) throws StoppedByUserSlidingException {
         if (this.injectionModel.isStoppedByUser()) {
             throw new StoppedByUserSlidingException();
         }
 
         var blindTest = new CallableVendor(
             vendorSpecificWithMode.replace(VendorYaml.TEST, this.injectionModel.getMediatorVendor().getVendor().instance().sqlBlindConfirm()),
             this,
             "vendor#confirm"
         );
         try {
             blindTest.call();
         } catch (Exception e) {
             LOGGER.log(LogLevelUtil.CONSOLE_JAVA, e, e);
         }
 
         return blindTest.isTrue() && !this.constantTrueMark.isEmpty();
     }
     
     public String callUrl(String urlString, String metadataInjectionProcess) {
         return this.injectionModel.injectWithoutIndex(urlString, metadataInjectionProcess);
     }
 
     public String callUrl(String urlString, String metadataInjectionProcess, AbstractCallableBit<?> callableBoolean) {
         return this.injectionModel.injectWithoutIndex(urlString, metadataInjectionProcess, callableBoolean);
     }
 
 
     // Getter
 
     public String getBlankFalseMark() {
         return this.blankFalseMark;
     }
     
     public List<Diff> getConstantTrueMark() {
         return this.constantTrueMark;
     }
 }