/*
 * 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.bean.openapi3;

import static org.apache.juneau.commons.utils.AssertionUtils.*;
import static org.apache.juneau.commons.utils.CollectionUtils.*;
import static org.apache.juneau.commons.utils.Utils.*;
import static org.apache.juneau.internal.ConverterUtils.*;

import java.net.*;
import java.util.*;

import org.apache.juneau.*;
import org.apache.juneau.commons.collections.*;

/**
 * A single encoding definition applied to a single schema property.
 *
 * <p>
 * The Encoding Object is a single encoding definition applied to a single schema property. It allows you to define
 * how a property should be serialized when it's part of a request or response body with a specific media type.
 *
 * <h5 class='section'>OpenAPI Specification:</h5>
 * <p>
 * The Encoding Object is composed of the following fields:
 * <ul class='spaced-list'>
 *    <li><c>contentType</c> (string) - The Content-Type for encoding a specific property. Default value depends on the property type
 *    <li><c>headers</c> (map of {@link HeaderInfo}) - A map allowing additional information to be provided as headers
 *    <li><c>style</c> (string) - Describes how a specific property value will be serialized depending on its type
 *    <li><c>explode</c> (boolean) - When this is true, property values of type array or object generate separate parameters for each value
 *    <li><c>allowReserved</c> (boolean) - Determines whether the parameter value should allow reserved characters
 * </ul>
 *
 * <h5 class='section'>Example:</h5>
 * <p class='bcode'>
 *    <jc>// Construct using SwaggerBuilder.</jc>
 *    Encoding <jv>x</jv> = <jsm>encoding</jsm>()
 *       .setContentType(<js>"application/x-www-form-urlencoded"</js>)
 *       .setStyle(<js>"form"</js>)
 *       .setExplode(<jk>true</jk>);
 *
 *    <jc>// Serialize using JsonSerializer.</jc>
 *    String <jv>json</jv> = Json.<jsm>from</jsm>(<jv>x</jv>);
 *
 *    <jc>// Or just use toString() which does the same as above.</jc>
 *    <jv>json</jv> = <jv>x</jv>.toString();
 * </p>
 * <p class='bcode'>
 *    <jc>// Output</jc>
 *    {
 *       <js>"contentType"</js>: <js>"application/x-www-form-urlencoded"</js>,
 *       <js>"style"</js>: <js>"form"</js>,
 *       <js>"explode"</js>: <jk>true</jk>
 *    }
 * </p>
 *
 * <h5 class='section'>See Also:</h5><ul>
 *    <li class='link'><a class="doclink" href="https://spec.openapis.org/oas/v3.0.0#encoding-object">OpenAPI Specification &gt; Encoding Object</a>
 *    <li class='link'><a class="doclink" href="https://swagger.io/docs/specification/describing-request-body/">OpenAPI Describing Request Body</a>
 *    <li class='link'><a class="doclink" href="https://juneau.apache.org/docs/topics/JuneauBeanOpenApi3">juneau-bean-openapi-v3</a>
 * </ul>
 */
public class Encoding extends OpenApiElement {

   private String contentType, style;
   private Map<String,HeaderInfo> headers = map();
   private Boolean explode, allowReserved;

   /**
    * Default constructor.
    */
   public Encoding() {}

   /**
    * Copy constructor.
    *
    * @param copyFrom The object to copy.
    */
   public Encoding(Encoding copyFrom) {
      super(copyFrom);

      this.contentType = copyFrom.contentType;
      this.style = copyFrom.style;
      this.explode = copyFrom.explode;
      this.allowReserved = copyFrom.allowReserved;
      if (nn(copyFrom.headers))
         headers.putAll(copyOf(copyFrom.headers, HeaderInfo::copy));
   }

   /**
    * Adds one or more values to the <property>headers</property> property.
    *
    * @param key The mapping key.  Must not be <jk>null</jk>.
    * @param value
    *    The values to add to this property.
    *    <br>Must not be <jk>null</jk>.
    * @return This object
    */
   public Encoding addHeader(String key, HeaderInfo value) {
      assertArgNotNull("key", key);
      assertArgNotNull("value", value);
      headers.put(key, value);
      return this;
   }

   /**
    * Make a deep copy of this object.
    *
    * @return A deep copy of this object.
    */
   public Encoding copy() {
      return new Encoding(this);
   }

   @Override /* Overridden from OpenApiElement */
   public <T> T get(String property, Class<T> type) {
      assertArgNotNull("property", property);
      return switch (property) {
         case "contentType" -> toType(getContentType(), type);
         case "style" -> toType(getStyle(), type);
         case "headers" -> toType(getHeaders(), type);
         case "explode" -> toType(getExplode(), type);
         case "allowReserved" -> toType(getAllowReserved(), type);
         default -> super.get(property, type);
      };
   }

   /**
    * Bean property getter:  <property>required</property>.
    *
    * <p>
    * The type of the object.
    *
    * @return The property value, or <jk>null</jk> if it is not set.
    */
   public Boolean getAllowReserved() { return allowReserved; }

   /**
    * Bean property getter:  <property>contentType</property>.
    *
    * <p>
    * The URL pointing to the contact information.
    *
    * @return The property value, or <jk>null</jk> if it is not set.
    */
   public String getContentType() { return contentType; }

   /**
    * Bean property getter:  <property>required</property>.
    *
    * <p>
    * The type of the object.
    *
    * @return The property value, or <jk>null</jk> if it is not set.
    */
   public Boolean getExplode() { return explode; }

   /**
    * Bean property getter:  <property>variables</property>.
    *
    * @return The property value, or <jk>null</jk> if it is not set.
    */
   public Map<String,HeaderInfo> getHeaders() { return nullIfEmpty(headers); }

   /**
    * Bean property getter:  <property>style</property>.
    *
    * @return The property value, or <jk>null</jk> if it is not set.
    */
   public String getStyle() { return style; }

   @Override /* Overridden from OpenApiElement */
   public Set<String> keySet() {
      // @formatter:off
      var s = setb(String.class)
         .addIf(nn(allowReserved), "allowReserved")
         .addIf(nn(contentType), "contentType")
         .addIf(nn(explode), "explode")
         .addIf(ne(headers), "headers")
         .addIf(nn(style), "style")
         .build();
      // @formatter:on
      return new MultiSet<>(s, super.keySet());
   }

   @Override /* Overridden from OpenApiElement */
   public Encoding set(String property, Object value) {
      assertArgNotNull("property", property);
      return switch (property) {
         case "allowReserved" -> setAllowReserved(toBoolean(value));
         case "contentType" -> setContentType(s(value));
         case "explode" -> setExplode(toBoolean(value));
         case "headers" -> setHeaders(toMapBuilder(value, String.class, HeaderInfo.class).sparse().build());
         case "style" -> setStyle(s(value));
         default -> {
            super.set(property, value);
            yield this;
         }
      };
   }

   /**
    * Bean property setter:  <property>explode</property>.
    *
    * <p>
    * The type of the object.
    *
    * @param value
    *    The new value for this property.
    *    <br>Property value is required.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public Encoding setAllowReserved(Boolean value) {
      allowReserved = value;
      return this;
   }

   /**
    * Bean property setter:  <property>url</property>.
    *
    * <p>
    * The value can be of any of the following types: {@link URI}, {@link URL}, {@link String}.
    * <br>Strings must be valid URIs.
    *
    * <p>
    * URIs defined by {@link UriResolver} can be used for values.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public Encoding setContentType(String value) {
      contentType = value;
      return this;
   }

   /**
    * Bean property setter:  <property>explode</property>.
    *
    * <p>
    * The type of the object.
    *
    * @param value
    *    The new value for this property.
    *    <br>Property value is required.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public Encoding setExplode(Boolean value) {
      explode = value;
      return this;
   }

   /**
    * Bean property setter:  <property>variables</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public Encoding setHeaders(Map<String,HeaderInfo> value) {
      headers.clear();
      if (nn(value))
         headers.putAll(value);
      return this;
   }

   /**
    * Bean property setter:  <property>description</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public Encoding setStyle(String value) {
      style = value;
      return this;
   }

   @Override /* Overridden from OpenApiElement */
   public Encoding strict(Object value) {
      super.strict(value);
      return this;
   }

   @Override /* Overridden from OpenApiElement */
   protected Encoding strict() {
      super.strict();
      return this;
   }
}