// ***************************************************************************************************************************
// * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements.  See the NOTICE file *
// * distributed with this work for additional information regarding copyright ownership.  The ASF licenses this file        *
// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance            *
// * with the License.  You may obtain a copy of the License at                                                              *
// *                                                                                                                         *
// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
// *                                                                                                                         *
// * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an  *
// * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the License for the        *
// * specific language governing permissions and limitations under the License.                                              *
// ***************************************************************************************************************************
package org.apache.juneau.json.annotation;

import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.*;
import static org.apache.juneau.internal.ArrayUtils.*;

import java.lang.annotation.*;
import java.lang.reflect.*;

import org.apache.juneau.*;
import org.apache.juneau.annotation.*;
import org.apache.juneau.reflect.*;
import org.apache.juneau.svl.*;

/**
 * Utility classes and methods for the {@link Json @Json} annotation.
 *
 * <h5 class='section'>See Also:</h5><ul>
 *    <li class='link'><a class="doclink" href="../../../../../index.html#jm.JsonDetails">JSON Details</a>
 * </ul>
 */
public class JsonAnnotation {

   //-----------------------------------------------------------------------------------------------------------------
   // Static
   //-----------------------------------------------------------------------------------------------------------------

   /** Default value */
   public static final Json DEFAULT = create().build();

   /**
    * Instantiates a new builder for this class.
    *
    * @return A new builder object.
    */
   public static Builder create() {
      return new Builder();
   }

   /**
    * Instantiates a new builder for this class.
    *
    * @param on The targets this annotation applies to.
    * @return A new builder object.
    */
   public static Builder create(Class<?>...on) {
      return create().on(on);
   }

   /**
    * Instantiates a new builder for this class.
    *
    * @param on The targets this annotation applies to.
    * @return A new builder object.
    */
   public static Builder create(String...on) {
      return create().on(on);
   }

   /**
    * Creates a copy of the specified annotation.
    *
    * @param a The annotation to copy.s
    * @param r The var resolver for resolving any variables.
    * @return A copy of the specified annotation.
    */
   public static Json copy(Json a, VarResolverSession r) {
      return
         create()
         .on(r.resolve(a.on()))
         .onClass(a.onClass())
         .wrapperAttr(r.resolve(a.wrapperAttr()))
         .build();
   }

   //-----------------------------------------------------------------------------------------------------------------
   // Builder
   //-----------------------------------------------------------------------------------------------------------------

   /**
    * Builder class.
    *
    * <h5 class='section'>See Also:</h5><ul>
    *    <li class='jm'>{@link org.apache.juneau.BeanContext.Builder#annotations(Annotation...)}
    * </ul>
    */
   public static class Builder extends TargetedAnnotationTMFBuilder {

      String wrapperAttr="";

      /**
       * Constructor.
       */
      protected Builder() {
         super(Json.class);
      }

      /**
       * Instantiates a new {@link Json @Json} object initialized with this builder.
       *
       * @return A new {@link Json @Json} object.
       */
      public Json build() {
         return new Impl(this);
      }

      /**
       * Sets the {@link Json#wrapperAttr} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder wrapperAttr(String value) {
         this.wrapperAttr = value;
         return this;
      }

      // <FluentSetters>

      @Override /* GENERATED - TargetedAnnotationBuilder */
      public Builder on(String...values) {
         super.on(values);
         return this;
      }

      @Override /* GENERATED - TargetedAnnotationTBuilder */
      public Builder on(java.lang.Class<?>...value) {
         super.on(value);
         return this;
      }

      @Override /* GENERATED - TargetedAnnotationTBuilder */
      public Builder onClass(java.lang.Class<?>...value) {
         super.onClass(value);
         return this;
      }

      @Override /* GENERATED - TargetedAnnotationTMFBuilder */
      public Builder on(Field...value) {
         super.on(value);
         return this;
      }

      @Override /* GENERATED - TargetedAnnotationTMFBuilder */
      public Builder on(Method...value) {
         super.on(value);
         return this;
      }

      // </FluentSetters>
   }

   //-----------------------------------------------------------------------------------------------------------------
   // Implementation
   //-----------------------------------------------------------------------------------------------------------------

   private static class Impl extends TargetedAnnotationTImpl implements Json {

      private final String wrapperAttr;

      Impl(Builder b) {
         super(b);
         this.wrapperAttr = b.wrapperAttr;
         postConstruct();
      }

      @Override /* Json */
      public String wrapperAttr() {
         return wrapperAttr;
      }
   }

   //-----------------------------------------------------------------------------------------------------------------
   // Appliers
   //-----------------------------------------------------------------------------------------------------------------

   /**
    * Applies targeted {@link Json} annotations to a {@link org.apache.juneau.Context.Builder}.
    */
   public static class Apply extends AnnotationApplier<Json,Context.Builder> {

      /**
       * Constructor.
       *
       * @param vr The resolver for resolving values in annotations.
       */
      public Apply(VarResolverSession vr) {
         super(Json.class, Context.Builder.class, vr);
      }

      @Override
      public void apply(AnnotationInfo<Json> ai, Context.Builder b) {
         Json a = ai.inner();
         if (isEmptyArray(a.on(), a.onClass()))
            return;
         b.annotations(copy(a, vr()));
      }
   }

   //-----------------------------------------------------------------------------------------------------------------
   // Other
   //-----------------------------------------------------------------------------------------------------------------

   /**
    * A collection of {@link Json @Json annotations}.
    */
   @Documented
   @Target({METHOD,TYPE})
   @Retention(RUNTIME)
   @Inherited
   public static @interface Array {

      /**
       * The child annotations.
       *
       * @return The annotation value.
       */
      Json[] value();
   }
}