package com.atlassian.sal.core.features;
   
   import com.atlassian.fugue.Option;
   import com.atlassian.sal.api.features.DarkFeatureManager;
   import com.atlassian.sal.api.user.UserManager;
   import com.google.common.collect.ImmutableSet;
   
   import java.util.Collections;
   import java.util.Set;
  
  /**
   * Default implementation of DarkFeatureManager - sufficient for any product which does not already have its own dark
   * feature framework. Does not implement per-user enabling.
   */
  public class DefaultDarkFeatureManager implements DarkFeatureManager
  {
      private final Set<String> enabledFeatureKeys;
      private final UserManager userManager;
  
      public DefaultDarkFeatureManager(UserManager userManager)
      {
          this.userManager = userManager;
          // initialize dark features based on system properties and contents of a properties file.
          final SystemDarkFeatureInitializer.SystemDarkFeatures systemDarkFeatures = SystemDarkFeatureInitializer.getSystemStartupDarkFeatures();
  
          enabledFeatureKeys = systemDarkFeatures.isDisableAll() ? Collections.<String>emptySet() : ImmutableSet.copyOf(systemDarkFeatures.getEnabled());
      }
  
      @Override
      public boolean isSystemFeatureEnabled(String key)
      {
          return enabledFeatureKeys.contains(key);
      }
  
      @Override
      public boolean isUserFeatureEnabled(String key)
      {
          return isSystemFeatureEnabled(key);
      }
  
      @Override
      public Option<Boolean> isUserFeatureEnabledForUser(String username, String key)
      {
          return userManager.resolve(username) == null ? Option.<Boolean>none() : Option.some(isSystemFeatureEnabled(key));
      }
  
      @Override
      public Set<String> getAllEnabledFeaturesForCurrentUser()
      {
          return enabledFeatureKeys;
      }
  
      @Override
      public Option<Set<String>> getAllEnanbedFeaturesForUser(String username)
      {
          return userManager.resolve(username) == null ? Option.<Set<String>>none() : Option.some(getAllEnabledFeaturesForCurrentUser());
      }
  }