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// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
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package org.apache.juneau.httppart.bean;

import static org.apache.juneau.internal.CollectionUtils.*;

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

import org.apache.juneau.annotation.*;
import org.apache.juneau.cp.*;
import org.apache.juneau.http.annotation.*;
import org.apache.juneau.httppart.*;
import org.apache.juneau.reflect.*;

/**
 * Represents the metadata gathered from a getter method of a class annotated with {@link Request}.
 *
 * <h5 class='section'>See Also:</h5><ul>
 *    <li class='link'><a class="doclink" href="../../../../../index.html#jm.HttpPartSerializersParsers">HTTP Part Serializers and Parsers</a>
 * </ul>
 */
public class RequestBeanPropertyMeta {

   static RequestBeanPropertyMeta.Builder create(HttpPartType partType, Class<? extends Annotation> c, MethodInfo m) {
      HttpPartSchema.Builder sb = HttpPartSchema.create().name(m.getPropertyName());
      m.forEachAnnotation(Schema.class, x -> true, x -> sb.apply(x));
      m.forEachAnnotation(c, x -> true, x -> sb.apply(x));
      return new Builder().partType(partType).schema(sb.build()).getter(m.inner());
   }

   //-----------------------------------------------------------------------------------------------------------------
   // Instance
   //-----------------------------------------------------------------------------------------------------------------

   private final Method getter;
   private final HttpPartType partType;
   private final Optional<HttpPartSerializer> serializer;
   private final HttpPartParser parser;
   private final HttpPartSchema schema;

   RequestBeanPropertyMeta(Builder b, HttpPartSerializer serializer, HttpPartParser parser) {
      this.partType = b.partType;
      this.schema = b.schema;
      this.getter = b.getter;
      this.serializer = optional(schema.getSerializer() == null ? serializer : BeanCreator.of(HttpPartSerializer.class).type(schema.getSerializer()).run());
      this.parser = schema.getParser() == null ? parser : BeanCreator.of(HttpPartParser.class).type(schema.getParser()).run();
   }

   static class Builder {
      HttpPartType partType;
      HttpPartSchema schema;
      Method getter;

      Builder getter(Method value) {
         getter = value;
         return this;
      }

      Builder partType(HttpPartType value) {
         partType = value;
         return this;
      }

      Builder schema(HttpPartSchema value) {
         schema = value;
         return this;
      }

      RequestBeanPropertyMeta build(HttpPartSerializer serializer, HttpPartParser parser) {
         return new RequestBeanPropertyMeta(this, serializer, parser);
      }
   }

   /**
    * Returns the HTTP part name for this property (query parameter name for example).
    *
    * @return The HTTP part name, or <jk>null</jk> if it doesn't have a part name.
    */
   public String getPartName() {
      return schema == null ? null : schema.getName();
   }

   /**
    * Returns the name of the Java method getter that defines this property.
    *
    * @return
    *    The name of the Java method getter that defines this property.
    *    <br>Never <jk>null</jk>.
    */
   public Method getGetter() {
      return getter;
   }

   /**
    * Returns the HTTP part type for this property (query parameter for example).
    *
    * @return
    *    The HTTP part type for this property.
    *    <br>Never <jk>null</jk>.
    */
   public HttpPartType getPartType() {
      return partType;
   }

   /**
    * Returns the serializer to use for serializing the bean property value.
    *
    * @return The serializer to use for serializing the bean property value.
    */
   public Optional<HttpPartSerializer> getSerializer() {
      return serializer;
   }

   /**
    * Returns the parser to use for parsing the bean property value.
    *
    * @param _default The default parsing to use if not defined on the annotation.
    * @return The parsing to use for serializing the bean property value.
    */
   public HttpPartParserSession getParser(HttpPartParserSession _default) {
      return parser == null ? _default : parser.getPartSession();
   }

   /**
    * Returns the schema information gathered from annotations on the method and return type.
    *
    * @return
    *    The schema information gathered from annotations on the method and return type.
    *    <br>Never <jk>null</jk>.
    */
   public HttpPartSchema getSchema() {
      return schema;
   }
}