package com.atlassian.plugin.refimpl.webresource;
   
   import com.atlassian.plugin.refimpl.CurrentHttpRequest;
   import com.atlassian.plugin.webresource.DefaultResourceBatchingConfiguration;
   import com.atlassian.plugin.webresource.ResourceBatchingConfiguration;
   import com.google.common.collect.ImmutableList;
   
   import javax.servlet.http.HttpServletRequest;
   import java.util.List;
  
  /**
   * Config class for batching that detects if the refapp should batch for all browsers, just IE or none at all. Resources
   * that need to be super-batched are hardcoded within the class.
   */
  
  public class RefAppResourceBatchingConfiguration extends DefaultResourceBatchingConfiguration
          implements ResourceBatchingConfiguration {
  
      private static String SUPER_BATCH_FOR = System.getProperty("super.batch.for");
      private static final boolean DEV_MODE = Boolean.getBoolean("atlassian.dev.mode");
  
      private static final List<String> resources = ImmutableList.of(
              "com.atlassian.refapp.amd:amd",
              "com.atlassian.auiplugin:ajs"
      );
  
      @Override
      public boolean isSuperBatchingEnabled() {
          return forceBatchingInThisRequest();
      }
  
      @Override
      public List<String> getSuperBatchModuleCompleteKeys() {
          return resources;
      }
  
      @Override
      public boolean isContextBatchingEnabled() {
          return !DEV_MODE;
      }
  
      @Override
      public boolean isPluginWebResourceBatchingEnabled() {
          return !DEV_MODE || forceBatchingInThisRequest();
      }
  
      private boolean forceBatchingInThisRequest() {
          // Only force batching if SUPER_BATCH_FOR variable is set, always return true if SUPER_BATCH_FOR is set to 'all'
          if ("all".equalsIgnoreCase(SUPER_BATCH_FOR)) {
              return true;
          }
          //if SUPER_BATCH_FOR is set to 'ie' return true only when the user agent of the request is IE.
          else if ("ie".equalsIgnoreCase(SUPER_BATCH_FOR)) {
              HttpServletRequest httpRequest = CurrentHttpRequest.getRequest();
              if (httpRequest == null) {
                  return false;
              }
              //only batch if the request came from IE (very simple implementation)'
  
              String userAgent = httpRequest.getHeader("USER-AGENT");
  
              if (userAgent != null) {
                  return userAgent.contains("Trident");
              }
          }
  
          //return false (turn super batch off) if variable isn't set
          return false;
      }
  }