package com.jsql.model.injection.strategy;
   
   import com.jsql.model.InjectionModel;
   import com.jsql.model.accessible.DataAccess;
   import com.jsql.model.bean.util.Interaction;
   import com.jsql.model.bean.util.Request;
   import com.jsql.model.injection.vendor.model.VendorYaml;
   import com.jsql.model.injection.vendor.model.yaml.Method;
   import com.jsql.model.suspendable.AbstractSuspendable;
  import com.jsql.util.I18nUtil;
  import com.jsql.util.LogLevelUtil;
  import com.jsql.util.StringUtil;
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  public class StrategyInjectionError extends AbstractStrategy {
      
      /**
       * Log4j logger sent to view.
       */
      private static final Logger LOGGER = LogManager.getRootLogger();
      
      private String[] tabCapacityMethod;
      
      private int indexErrorStrategy = 0;
  
      public StrategyInjectionError(InjectionModel injectionModel) {
          super(injectionModel);
      }
  
      @Override
      public void checkApplicability() {
          // Reset applicability of new Vendor
          this.isApplicable = false;
          
          var strategyYaml = this.injectionModel.getMediatorVendor().getVendor().instance().getModelYaml().getStrategy();
  
          if (this.injectionModel.getMediatorUtils().getPreferencesUtil().isStrategyErrorDisabled()) {
              LOGGER.log(LogLevelUtil.CONSOLE_INFORM, AbstractStrategy.FORMAT_SKIP_STRATEGY_DISABLED, this.getName());
              return;
          } else if (strategyYaml.getError().getMethod().isEmpty()) {
              LOGGER.log(
                  LogLevelUtil.CONSOLE_ERROR,
                  AbstractStrategy.FORMAT_STRATEGY_NOT_IMPLEMENTED,
                  this.getName(),
                  this.injectionModel.getMediatorVendor().getVendor()
              );
              return;
          }
  
          this.logChecking();
  
          this.tabCapacityMethod = new String[strategyYaml.getError().getMethod().size()];
          var indexErrorMethod = 0;
          var errorCapacity = 0;
          
          for (Method errorMethod: strategyYaml.getError().getMethod()) {
              boolean methodIsApplicable = this.isApplicable(errorMethod);
              if (methodIsApplicable) {
                  Matcher regexSearch = this.getPerformance(errorMethod);
                  if (regexSearch.find()) {
                      errorCapacity = this.getCapacity(indexErrorMethod, errorCapacity, errorMethod, regexSearch);
                  } else {
                      LOGGER.log(
                          LogLevelUtil.CONSOLE_ERROR,
                          "{} {} but injectable size is incorrect",
                          () -> I18nUtil.valueByKey("LOG_VULNERABLE"),
                          errorMethod::getName
                      );
                      methodIsApplicable = false;
                  }
              }
              
              if (methodIsApplicable) {
                  this.allow(indexErrorMethod);
              } else {
                  this.unallow(indexErrorMethod);
              }
              indexErrorMethod++;
          }
      }
  
      private boolean isApplicable(Method errorMethod) {
          var methodIsApplicable = false;
  
          String performanceSourcePage = this.injectionModel.injectWithoutIndex(
              this.injectionModel.getMediatorVendor().getVendor().instance().sqlErrorIndice(errorMethod),
              "error#confirm"
          );
  
          var indexZeroToFind = "0";
          String regexIndexZero = String.format(VendorYaml.FORMAT_INDEX, indexZeroToFind);
          if (performanceSourcePage.matches("(?s).*"+ regexIndexZero +".*")) {
              methodIsApplicable = true;
              this.isApplicable = true;
          }
         return methodIsApplicable;
     }
 
     private Matcher getPerformance(Method errorMethod) {
         String performanceErrorSourcePage = this.injectionModel.injectWithoutIndex(
             this.injectionModel.getMediatorVendor().getVendor().instance().sqlErrorCalibrator(errorMethod),
             "error#size"
         );
         return Pattern.compile("(?s)"+ DataAccess.LEAD +"("+ VendorYaml.CALIBRATOR_SQL +"+)").matcher(performanceErrorSourcePage);
     }
 
     private int getCapacity(int indexErrorMethod, int errorCapacityDefault, Method errorMethod, Matcher regexSearch) {
         int errorCapacityImproved = errorCapacityDefault;
         
         regexSearch.reset();
         while (regexSearch.find()) {
             if (errorCapacityImproved < regexSearch.group(1).length()) {
                 this.indexErrorStrategy = indexErrorMethod;
             }
             errorCapacityImproved = regexSearch.group(1).length();
             this.tabCapacityMethod[indexErrorMethod] = Integer.toString(errorCapacityImproved);
         }
         
         int logErrorCapacityImproved = errorCapacityImproved;
         LOGGER.log(
             LogLevelUtil.CONSOLE_SUCCESS,
             "{} [Error {}] showing [{}] characters",
             () -> I18nUtil.valueByKey("LOG_VULNERABLE"),
             errorMethod::getName,
             () -> Integer.toString(logErrorCapacityImproved)
         );
         
         return errorCapacityImproved;
     }
 
     @Override
     public void allow(int... indexError) {
         this.injectionModel.appendAnalysisReport(
             StringUtil.formatReport(
                 LogLevelUtil.COLOR_BLU,
                 "### Strategy: "+ this.getName() +":"+ this.injectionModel.getMediatorVendor().getVendor().instance()
                 .getModelYaml()
                 .getStrategy()
                 .getError()
                 .getMethod()
                 .get(indexError[0])
                 .getName()
             )
             + this.injectionModel.getReportWithoutIndex(
                 this.injectionModel.getMediatorVendor().getVendor().instance().sqlError(
                     StringUtil.formatReport(LogLevelUtil.COLOR_GREEN, "&lt;query&gt;"),
                     "0",
                     indexError[0],
                     true
                 ),
                 "metadataInjectionProcess"
             )
         );
         this.markVulnerability(Interaction.MARK_ERROR_VULNERABLE, indexError[0]);
     }
 
     @Override
     public void unallow(int... indexError) {
         this.markVulnerability(Interaction.MARK_ERROR_INVULNERABLE, indexError[0]);
     }
 
     @Override
     public String inject(String sqlQuery, String startPosition, AbstractSuspendable stoppable, String metadataInjectionProcess) {
         return this.injectionModel.injectWithoutIndex(
             this.injectionModel.getMediatorVendor().getVendor().instance().sqlError(sqlQuery, startPosition, this.indexErrorStrategy, false),
             metadataInjectionProcess
         );
     }
 
     @Override
     public void activateWhenApplicable() {
         if (this.injectionModel.getMediatorStrategy().getStrategy() == null && this.isApplicable()) {
             LOGGER.log(
                 LogLevelUtil.CONSOLE_INFORM,
                 "{} [{} {}]",
                 () -> I18nUtil.valueByKey("LOG_USING_STRATEGY"),
                 this::getName,
                 () -> this.injectionModel.getMediatorVendor().getVendor().instance().getModelYaml().getStrategy()
                 .getError().getMethod().get(this.indexErrorStrategy).getName()
             );
             this.injectionModel.getMediatorStrategy().setStrategy(this.injectionModel.getMediatorStrategy().getError());
 
             var request = new Request();
             request.setMessage(Interaction.MARK_ERROR_STRATEGY);
             this.injectionModel.sendToViews(request);
         }
     }
     
     @Override
     public String getPerformanceLength() {
         return this.tabCapacityMethod[this.indexErrorStrategy];
     }
     
     @Override
     public String getName() {
         return "Error";
     }
     
     public Integer getIndexErrorStrategy() {
         return this.indexErrorStrategy;
     }
     
     public void setIndexErrorStrategy(int indexErrorStrategy) {
         this.indexErrorStrategy = indexErrorStrategy;
     }
 }