/*
 * 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.http.annotation;

import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.*;
import static org.apache.juneau.Constants.*;
import static org.apache.juneau.commons.utils.CollectionUtils.*;
import static org.apache.juneau.commons.utils.StringUtils.*;
import static org.apache.juneau.commons.utils.Utils.*;

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

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

/**
 * Utility classes and methods for the {@link Path @Path} annotation.
 *
 */
public class PathAnnotation {

   private static final AnnotationProvider AP = AnnotationProvider.INSTANCE;

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

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

      @Override
      public void apply(AnnotationInfo<Path> ai, BeanContext.Builder b) {
         Path a = ai.inner();
         if (isEmptyArray(a.on()) && isEmptyArray(a.onClass()))
            return;
         b.annotations(a);
      }
   }

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

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

   /**
    * 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 AppliedAnnotationObject.BuilderTMF {

      private String[] description = {};
      private Class<? extends HttpPartParser> parser = HttpPartParser.Void.class;
      private Class<? extends HttpPartSerializer> serializer = HttpPartSerializer.Void.class;
      private Schema schema = SchemaAnnotation.DEFAULT;
      private String name = "", value = "", def = NONE;

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

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

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

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

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

      /**
       * Sets the {@link Path#parser} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder parser(Class<? extends HttpPartParser> value) {
         parser = value;
         return this;
      }

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

      /**
       * Sets the {@link Path#serializer} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder serializer(Class<? extends HttpPartSerializer> value) {
         serializer = value;
         return this;
      }

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

      @Override /* Overridden from AppliedAnnotationObject.Builder */
      public Builder on(String...value) {
         super.on(value);
         return this;
      }

      @Override /* Overridden from AppliedAnnotationObject.BuilderT */
      public Builder on(Class<?>...value) {
         super.on(value);
         return this;
      }

      @Override /* Overridden from AppliedOnClassAnnotationObject.Builder */
      public Builder onClass(Class<?>...value) {
         super.onClass(value);
         return this;
      }

      @Override /* Overridden from AppliedAnnotationObject.BuilderM */
      public Builder on(Method...value) {
         super.on(value);
         return this;
      }

      @Override /* Overridden from AppliedAnnotationObject.BuilderMF */
      public Builder on(Field...value) {
         super.on(value);
         return this;
      }

      @Override /* Overridden from AppliedAnnotationObject.BuilderT */
      public Builder on(ClassInfo...value) {
         super.on(value);
         return this;
      }

      @Override /* Overridden from AppliedAnnotationObject.BuilderT */
      public Builder onClass(ClassInfo...value) {
         super.onClass(value);
         return this;
      }

      @Override /* Overridden from AppliedAnnotationObject.BuilderTMF */
      public Builder on(FieldInfo...value) {
         super.on(value);
         return this;
      }

      @Override /* Overridden from AppliedAnnotationObject.BuilderTMF */
      public Builder on(MethodInfo...value) {
         super.on(value);
         return this;
      }

   }

   private static class Object extends AppliedOnClassAnnotationObject implements Path {

      private final String[] description;
      private final Class<? extends HttpPartParser> parser;
      private final Class<? extends HttpPartSerializer> serializer;
      private final String name, value, def;
      private final Schema schema;

      Object(PathAnnotation.Builder b) {
         super(b);
         description = copyOf(b.description);
         def = b.def;
         name = b.name;
         parser = b.parser;
         schema = b.schema;
         serializer = b.serializer;
         value = b.value;
      }

      @Override /* Overridden from Path */
      public String def() {
         return def;
      }

      @Override /* Overridden from Path */
      public String name() {
         return name;
      }

      @Override /* Overridden from Path */
      public Class<? extends HttpPartParser> parser() {
         return parser;
      }

      @Override /* Overridden from Path */
      public Schema schema() {
         return schema;
      }

      @Override /* Overridden from Path */
      public Class<? extends HttpPartSerializer> serializer() {
         return serializer;
      }

      @Override /* Overridden from Path */
      public String value() {
         return value;
      }

      @Override /* Overridden from annotation */
      public String[] description() {
         return description;
      }
   }

   /** Default value */
   public static final Path 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);
   }

   /**
    * Returns <jk>true</jk> if the specified annotation contains all default values.
    *
    * @param a The annotation to check.
    * @return <jk>true</jk> if the specified annotation contains all default values.
    */
   public static boolean empty(Path a) {
      return a == null || DEFAULT.equals(a);
   }

   /**
    * Finds the default value from the specified list of annotations.
    *
    * @param pi The parameter.
    * @return The last matching default value, or empty if not found.
    */
   public static Optional<String> findDef(ParameterInfo pi) {
      // @formatter:off
      return AP.find(Header.class, pi)
         .stream()
         .map(AnnotationInfo::inner)
         .filter(x -> ne(x.def()) && neq(NONE, x.def()))
         .findFirst()
         .map(x -> x.def());
      // @formatter:on
   }

   /**
    * Finds the name from the specified lists of annotations.
    *
    * <p>
    * The last matching name found is returned.
    *
    * @param pi The parameter.
    * @return The last matching name, or empty if not found.
    */
   public static Optional<String> findName(ParameterInfo pi) {
      return AP.find(Path.class, pi).stream().map(AnnotationInfo::inner).filter(x -> isAnyNotBlank(x.value(), x.name())).findFirst().map(x -> firstNonBlank(x.name(), x.value()));
   }
}