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// * 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                                                                             *
// *                                                                                                                         *
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// * specific language governing permissions and limitations under the License.                                              *
// ***************************************************************************************************************************
package org.apache.juneau.httppart.bean;

import static org.apache.juneau.internal.ClassUtils.*;
import static org.apache.juneau.httppart.bean.Utils.*;
import static org.apache.juneau.httppart.HttpPartType.*;

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

import org.apache.juneau.*;
import org.apache.juneau.http.annotation.*;
import org.apache.juneau.httppart.*;
import org.apache.juneau.internal.*;

/**
 * Represents the metadata gathered from a parameter or class annotated with {@link Request}.
 */
public class RequestBeanMeta {

   /**
    * Create metadata from specified parameter.
    *
    * @param m The method containing the parameter or parameter type annotated with {@link Request}.
    * @param i The parameter index.
    * @param ps
    *    Configuration information used to instantiate part serializers and part parsers.
    *    <br>Can be <jk>null</jk>.
    * @return Metadata about the parameter, or <jk>null</jk> if parameter or parameter type not annotated with {@link Request}.
    */
   public static RequestBeanMeta create(Method m, int i, PropertyStore ps) {
      if (! hasAnnotation(Request.class, m, i))
         return null;
      return new RequestBeanMeta.Builder(ps).apply(m, i).build();
   }

   /**
    * Create metadata from specified class.
    *
    * @param c The class annotated with {@link Request}.
    * @param ps
    *    Configuration information used to instantiate part serializers and part parsers.
    *    <br>Can be <jk>null</jk>.
    * @return Metadata about the class, or <jk>null</jk> if class not annotated with {@link Request}.
    */
   public static RequestBeanMeta create(Class<?> c, PropertyStore ps) {
      if (! hasAnnotation(Request.class, c))
         return null;
      return new RequestBeanMeta.Builder(ps).apply(c).build();
   }

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

   private final ClassMeta<?> cm;
   private final Map<String,RequestBeanPropertyMeta> properties;
   private final HttpPartSerializer serializer;
   private final HttpPartParser parser;

   RequestBeanMeta(Builder b) {
      this.cm = b.cm;
      this.serializer = ClassUtils.newInstance(HttpPartSerializer.class, b.serializer, true, b.ps);
      this.parser = ClassUtils.newInstance(HttpPartParser.class, b.parser, true, b.ps);
      Map<String,RequestBeanPropertyMeta> properties = new LinkedHashMap<>();
      for (Map.Entry<String,RequestBeanPropertyMeta.Builder> e : b.properties.entrySet())
         properties.put(e.getKey(), e.getValue().build(serializer, parser));
      this.properties = Collections.unmodifiableMap(properties);
   }

   static class Builder {
      ClassMeta<?> cm;
      PropertyStore ps;
      Class<? extends HttpPartSerializer> serializer;
      Class<? extends HttpPartParser> parser;
      Map<String,RequestBeanPropertyMeta.Builder> properties = new LinkedHashMap<>();

      Builder(PropertyStore ps) {
         this.ps = ps;
      }

      Builder apply(Method m, int i) {
         return apply(m.getParameterTypes()[i]).apply(getAnnotation(Request.class, m, i));
      }

      Builder apply(Class<?> c) {
         apply(getAnnotation(Request.class, c));
         this.cm = BeanContext.DEFAULT.getClassMeta(c);
         for (Method m : ClassUtils.getAllMethods(c, false)) {
            if (isPublic(m)) {
               assertNoAnnotations(m, Request.class, ResponseHeader.class, ResponseBody.class, ResponseStatus.class);
               String n = m.getName();
               if (hasAnnotation(Body.class, m)) {
                  assertNoArgs(m, Body.class);
                  assertReturnNotVoid(m, Body.class);
                  properties.put(n, RequestBeanPropertyMeta.create(BODY, Body.class, m));
               } else if (hasAnnotation(Header.class, m)) {
                  assertNoArgs(m, Header.class);
                  assertReturnNotVoid(m, Header.class);
                  properties.put(n, RequestBeanPropertyMeta.create(HEADER, Header.class, m));
               } else if (hasAnnotation(Query.class, m)) {
                  assertNoArgs(m, Query.class);
                  assertReturnNotVoid(m, Query.class);
                  properties.put(n, RequestBeanPropertyMeta.create(QUERY, Query.class, m));
               } else if (hasAnnotation(FormData.class, m)) {
                  assertNoArgs(m, FormData.class);
                  assertReturnNotVoid(m, FormData.class);
                  properties.put(n, RequestBeanPropertyMeta.create(FORMDATA, FormData.class, m));
               } else if (hasAnnotation(Path.class, m)) {
                  assertNoArgs(m, Path.class);
                  assertReturnNotVoid(m, Path.class);
                  properties.put(n, RequestBeanPropertyMeta.create(PATH, Path.class, m));
               }
            }
         }
         return this;
      }

      Builder apply(Request a) {
         if (a != null) {
            if (a.partSerializer() != HttpPartSerializer.Null.class)
               serializer = a.partSerializer();
            if (a.partParser() != HttpPartParser.Null.class)
               parser = a.partParser();
         }
         return this;
      }

      RequestBeanMeta build() {
         return new RequestBeanMeta(this);
      }
   }

   /**
    * Returns metadata about the class.
    *
    * @return Metadata about the class.
    */
   public ClassMeta<?> getClassMeta() {
      return cm;
   }

   /**
    * Returns metadata about the bean property with the specified property name.
    *
    * @param name The bean property name.
    * @return Metadata about the bean property, or <jk>null</jk> if none found.
    */
   public RequestBeanPropertyMeta getProperty(String name) {
      return properties.get(name);
   }

   /**
    * Returns all the annotated methods on this bean.
    *
    * @return All the annotated methods on this bean.
    */
   public Collection<RequestBeanPropertyMeta> getProperties() {
      return properties.values();
   }
}