package com.atlassian.sal.api.features;
   
   import com.atlassian.plugin.PluginParseException;
   import com.atlassian.plugin.web.Condition;
   
   import java.util.Map;
   
   import static com.atlassian.sal.api.features.ValidFeatureKeyPredicate.checkFeatureKey;
   
  /**
   * A parameterised plugin module condition for enabling modules in the presence of a dark feature.
   * Pass a param with parameter name "featureKey" containing the dark feature key. Example:
   * <pre>
   *  &lt;web-item key="some-key" section="some/section" weight="1"&gt;
   *      &lt;label key="menu.title"/&gt;
   *      &lt;link&gt;/some/path&lt;/link&gt;
   *      &lt;condition class="com.atlassian.sal.api.features.DarkFeatureEnabledCondition"&gt;
   *          &lt;param name="featureKey"&gt;feature.key&lt;/param&gt;
   *      &lt;/condition&gt;
   *  &lt;/web-item&gt;
   * </pre>
   * The feature key is validated using the {@link ValidFeatureKeyPredicate}.
   * @see ValidFeatureKeyPredicate
   */
  public class DarkFeatureEnabledCondition implements Condition
  {
      private static final String FEATURE_KEY_INIT_PARAMETER_NAME = "featureKey";
      private final DarkFeatureManager darkFeatureManager;
      private String featureKey;
  
      public DarkFeatureEnabledCondition(final DarkFeatureManager darkFeatureManager)
      {
          this.darkFeatureManager = darkFeatureManager;
      }
  
      @Override
      public void init(final Map<String, String> params) throws PluginParseException
      {
          if (params.containsKey(FEATURE_KEY_INIT_PARAMETER_NAME))
          {
              featureKey = checkFeatureKey(params.get(FEATURE_KEY_INIT_PARAMETER_NAME));
          }
          else
          {
              throw new PluginParseException("Parameter '" + FEATURE_KEY_INIT_PARAMETER_NAME + "' is mandatory.");
          }
      }
  
      @Override
      public boolean shouldDisplay(final Map<String, Object> stringObjectMap)
      {
          try
          {
              return darkFeatureManager.isFeatureEnabledForCurrentUser(featureKey);
          }
          catch (RuntimeException e)
          {
              return false;
          }
      }
  }