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package org.infinispan.configuration.cache;

import org.infinispan.commons.configuration.AbstractTypedPropertiesConfiguration;
import org.infinispan.commons.configuration.attributes.Attribute;
import org.infinispan.commons.configuration.attributes.AttributeDefinition;
import org.infinispan.commons.configuration.attributes.AttributeSet;
import org.infinispan.commons.configuration.attributes.IdentityAttributeCopier;
import org.infinispan.commons.configuration.attributes.SimpleInstanceAttributeCopier;
import org.infinispan.commons.util.Util;
import org.infinispan.interceptors.base.CommandInterceptor;

/**
 * Describes a custom interceptor
 */
public class InterceptorConfiguration extends AbstractTypedPropertiesConfiguration {
   /**
    * Positional placing of a new custom interceptor
    */
   public static enum Position {
      /**
       * Specifies that the new interceptor is placed first in the chain.
       */
      FIRST,
      /**
       * Specifies that the new interceptor is placed last in the chain. The new interceptor is added right before the
       * last interceptor in the chain. The very last interceptor is owned by Infinispan and cannot be replaced.
       */
      LAST,
      /**
       * Specifies that the new interceptor can be placed anywhere, except first or last.
       */
      OTHER_THAN_FIRST_OR_LAST
   }

   public static final AttributeDefinition POSITION = AttributeDefinition.builder("position", Position.OTHER_THAN_FIRST_OR_LAST).immutable().build();
   public static final AttributeDefinition AFTER = AttributeDefinition.builder("after", null, Class.class).immutable().build();
   public static final AttributeDefinition BEFORE = AttributeDefinition.builder("before", null, Class.class).immutable().build();
   public static final AttributeDefinition INTERCEPTOR = AttributeDefinition.builder("interceptor", null, CommandInterceptor.class).copier(IdentityAttributeCopier.INSTANCE).immutable().build();
   public static final AttributeDefinition INTERCEPTOR_CLASS = AttributeDefinition.builder("interceptorClass", null, Class.class).immutable().build();
   public static final AttributeDefinition INDEX = AttributeDefinition.builder("index", -1).immutable().build();

   public static AttributeSet attributeDefinitionSet() {
      return new AttributeSet(InterceptorConfiguration.class, AbstractTypedPropertiesConfiguration.attributeSet(), POSITION, AFTER, BEFORE, INTERCEPTOR, INTERCEPTOR_CLASS, INDEX);
   }

   private final Attribute position;
   private final Attribute after;
   private final Attribute before;
   private final Attribute interceptor;
   private final Attribute interceptorClass;
   private final Attribute index;

   InterceptorConfiguration(AttributeSet attributes) {
      super(attributes);
      position = attributes.attribute(POSITION);
      after = attributes.attribute(AFTER);
      before = attributes.attribute(BEFORE);
      interceptor = attributes.attribute(INTERCEPTOR);
      interceptorClass = attributes.attribute(INTERCEPTOR_CLASS);
      index = attributes.attribute(INDEX);
   }

   @SuppressWarnings("unchecked")
   public Class after() {
      return after.get();
   }

   @SuppressWarnings("unchecked")
   public Class before() {
      return before.get();
   }

   public CommandInterceptor interceptor() {
      if (interceptor.isNull()) {
         return (CommandInterceptor) Util.getInstance(interceptorClass.get());
      } else {
         return interceptor.get();
      }
   }

   public Class interceptorClass() {
      return interceptorClass.get();
   }

   public int index() {
      return index.get();
   }

   public Position position() {
      return position.get();
   }

   public boolean first() {
      return position() == Position.FIRST;
   }

   public boolean last() {
      return position() == Position.LAST;
   }

   public AttributeSet attributes() {
      return attributes;
   }

   @Override
   public String toString() {
      return "InterceptorConfiguration [attributes=" + attributes + "]";
   }
}