package com.atlassian.activeobjects.servlet;
   
   import com.google.common.base.Predicate;
   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;
   
   import java.util.Map;
   
   import static com.google.common.base.Preconditions.checkNotNull;
  import static com.google.common.collect.Maps.filterEntries;
  
  public final class AdminUi {
      private static final Logger log = LoggerFactory.getLogger(AdminUi.class);
  
      private final Map<String, Object> essentials;
  
      public AdminUi(Map<String, Object> essentials) {
          this.essentials = checkNotNull(essentials);
      }
  
      boolean isEnabled() {
          final Map<String, Object> unavailable = filterEntries(essentials, new UnavailableServicePredicate());
  
          if (!unavailable.isEmpty()) {
              log.debug("The admin UI is disabled because of the following services not being available:\n{}", unavailable.keySet());
          }
          return unavailable.isEmpty();
      }
  
      static boolean isDevModeEnabled() {
          return Boolean.getBoolean("atlassian.dev.mode");
      }
  
      private static class UnavailableServicePredicate implements Predicate<Map.Entry<String, Object>> {
          @Override
          public boolean apply(Map.Entry<String, Object> entry) {
              try {
                  entry.getValue().toString(); // try toString as it shouldn't have side effects
                  return false;
              } catch (RuntimeException e) {
                  if (e.getClass().getSimpleName().equals("ServiceUnavailableException")) {
                      if (isDevModeEnabled()) {
                          log.warn("Service is unavailable, admin UI will be disabled.", e);
                      }
                      return true;
                  }
                  throw e;
              }
          }
      }
  }