/*
 * 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.util.*;

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

/**
 * Describes the operations available on a single path.
 *
 * <p>
 * The PathItem Object describes the operations available on a single path. A Path Item may be empty, due to ACL
 * constraints. The path itself is still exposed to the documentation viewer but they will not know which operations
 * and parameters are available.
 *
 * <h5 class='section'>OpenAPI Specification:</h5>
 * <p>
 * The PathItem Object is composed of the following fields:
 * <ul class='spaced-list'>
 *    <li><c>summary</c> (string) - An optional, string summary, intended to apply to all operations in this path
 *    <li><c>description</c> (string) - An optional, string description, intended to apply to all operations in this path
 *    <li><c>get</c> ({@link Operation}) - A definition of a GET operation on this path
 *    <li><c>put</c> ({@link Operation}) - A definition of a PUT operation on this path
 *    <li><c>post</c> ({@link Operation}) - A definition of a POST operation on this path
 *    <li><c>delete</c> ({@link Operation}) - A definition of a DELETE operation on this path
 *    <li><c>options</c> ({@link Operation}) - A definition of an OPTIONS operation on this path
 *    <li><c>head</c> ({@link Operation}) - A definition of a HEAD operation on this path
 *    <li><c>patch</c> ({@link Operation}) - A definition of a PATCH operation on this path
 *    <li><c>trace</c> ({@link Operation}) - A definition of a TRACE operation on this path
 *    <li><c>servers</c> (array of {@link Server}) - An alternative server array to service all operations in this path
 *    <li><c>parameters</c> (array of {@link Parameter}) - A list of parameters that are applicable for all the operations described under this path
 * </ul>
 *
 * <h5 class='section'>Example:</h5>
 * <p class='bcode'>
 *    <jc>// Construct using SwaggerBuilder.</jc>
 *    PathItem <jv>x</jv> = <jsm>pathItem</jsm>()
 *       .setSummary(<js>"User management"</js>)
 *       .setGet(<jsm>operation</jsm>().setSummary(<js>"Get users"</js>))
 *       .setPost(<jsm>operation</jsm>().setSummary(<js>"Create user"</js>));
 *
 *    <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>"summary"</js>: <js>"User management"</js>,
 *       <js>"get"</js>: { <js>"summary"</js>: <js>"Get users"</js> },
 *       <js>"post"</js>: { <js>"summary"</js>: <js>"Create user"</js> }
 *    }
 * </p>
 *
 * <h5 class='section'>See Also:</h5><ul>
 *    <li class='link'><a class="doclink" href="https://spec.openapis.org/oas/v3.0.0#path-item-object">OpenAPI Specification &gt; Path Item Object</a>
 *    <li class='link'><a class="doclink" href="https://swagger.io/docs/specification/paths-and-operations/">OpenAPI Paths and Operations</a>
 *    <li class='link'><a class="doclink" href="https://juneau.apache.org/docs/topics/JuneauBeanOpenApi3">juneau-bean-openapi-v3</a>
 * </ul>
 */
public class PathItem extends OpenApiElement {

   private String summary, description;
   private Operation get, put, post, delete, options, head, patch, trace;
   private List<Server> servers;
   private List<Parameter> parameters;

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

   /**
    * Copy constructor.
    *
    * @param copyFrom The object to copy.
    */
   public PathItem(PathItem copyFrom) {
      super(copyFrom);
      this.summary = copyFrom.summary;
      this.description = copyFrom.description;
      this.get = copyFrom.get;
      this.put = copyFrom.put;
      this.post = copyFrom.post;
      this.delete = copyFrom.delete;
      this.options = copyFrom.options;
      this.head = copyFrom.head;
      this.patch = copyFrom.patch;
      this.trace = copyFrom.trace;
      this.servers = copyOf(copyFrom.servers);
      this.parameters = copyOf(copyFrom.parameters);
   }

   /**
    * Creates a copy of this object.
    *
    * @return A copy of this object.
    */
   public PathItem copy() {
      return new PathItem(this);
   }

   @Override /* Overridden from OpenApiElement */
   public <T> T get(String property, Class<T> type) {
      assertArgNotNull("property", property);
      return switch (property) {
         case "summary" -> toType(getSummary(), type);
         case "description" -> toType(getDescription(), type);
         case "get" -> toType(getGet(), type);
         case "put" -> toType(getPut(), type);
         case "post" -> toType(getPost(), type);
         case "delete" -> toType(getDelete(), type);
         case "options" -> toType(getOptions(), type);
         case "head" -> toType(getHead(), type);
         case "patch" -> toType(getPatch(), type);
         case "trace" -> toType(getTrace(), type);
         case "servers" -> toType(getServers(), type);
         case "parameters" -> toType(getParameters(), type);
         default -> super.get(property, type);
      };
   }

   /**
    * Returns the DELETE operation.
    *
    * @return The DELETE operation.
    */
   public Operation getDelete() { return delete; }

   /**
    * Returns the description.
    *
    * @return The description.
    */
   public String getDescription() { return description; }

   /**
    * Returns the GET operation.
    *
    * @return The GET operation.
    */
   public Operation getGet() { return get; }

   /**
    * Returns the HEAD operation.
    *
    * @return The HEAD operation.
    */
   public Operation getHead() { return head; }

   /**
    * Returns the OPTIONS operation.
    *
    * @return The OPTIONS operation.
    */
   public Operation getOptions() { return options; }

   /**
    * Returns the parameters list.
    *
    * @return The parameters list.
    */
   public List<Parameter> getParameters() { return parameters; }

   /**
    * Returns the PATCH operation.
    *
    * @return The PATCH operation.
    */
   public Operation getPatch() { return patch; }

   /**
    * Returns the POST operation.
    *
    * @return The POST operation.
    */
   public Operation getPost() { return post; }

   /**
    * Returns the PUT operation.
    *
    * @return The PUT operation.
    */
   public Operation getPut() { return put; }

   /**
    * Returns the servers list.
    *
    * @return The servers list.
    */
   public List<Server> getServers() { return servers; }

   /**
    * Returns the summary.
    *
    * @return The summary.
    */
   public String getSummary() { return summary; }

   /**
    * Returns the TRACE operation.
    *
    * @return The TRACE operation.
    */
   public Operation getTrace() { return trace; }

   @Override /* Overridden from OpenApiElement */
   public Set<String> keySet() {
      // @formatter:off
      var s = setb(String.class)
         .addIf(nn(delete), "delete")
         .addIf(nn(description), "description")
         .addIf(nn(get), "get")
         .addIf(nn(head), "head")
         .addIf(nn(options), "options")
         .addIf(nn(parameters), "parameters")
         .addIf(nn(patch), "patch")
         .addIf(nn(post), "post")
         .addIf(nn(put), "put")
         .addIf(nn(servers), "servers")
         .addIf(nn(summary), "summary")
         .addIf(nn(trace), "trace")
         .build();
      // @formatter:on
      return new MultiSet<>(s, super.keySet());
   }

   @Override /* Overridden from OpenApiElement */
   public PathItem set(String property, Object value) {
      assertArgNotNull("property", property);
      return switch (property) {
         case "delete" -> setDelete(toType(value, Operation.class));
         case "description" -> setDescription(s(value));
         case "get" -> setGet(toType(value, Operation.class));
         case "head" -> setHead(toType(value, Operation.class));
         case "options" -> setOptions(toType(value, Operation.class));
         case "patch" -> setPatch(toType(value, Operation.class));
         case "parameters" -> setParameters(listb(Parameter.class).addAny(value).sparse().build());
         case "post" -> setPost(toType(value, Operation.class));
         case "put" -> setPut(toType(value, Operation.class));
         case "servers" -> setServers(listb(Server.class).addAny(value).sparse().build());
         case "summary" -> setSummary(s(value));
         case "trace" -> setTrace(toType(value, Operation.class));
         default -> {
            super.set(property, value);
            yield this;
         }
      };
   }

   /**
    * Sets the DELETE operation.
    *
    * @param value The new value for this property.
    * @return This object.
    */
   public PathItem setDelete(Operation value) {
      delete = value;
      return this;
   }

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

   /**
    * Sets the GET operation.
    *
    * @param value The new value for this property.
    * @return This object.
    */
   public PathItem setGet(Operation value) {
      get = value;
      return this;
   }

   /**
    * Sets the HEAD operation.
    *
    * @param value The new value for this property.
    * @return This object.
    */
   public PathItem setHead(Operation value) {
      head = value;
      return this;
   }

   /**
    * Sets the OPTIONS operation.
    *
    * @param value The new value for this property.
    * @return This object.
    */
   public PathItem setOptions(Operation value) {
      options = value;
      return this;
   }

   /**
    * Sets the parameters list.
    *
    * @param value The new value for this property.
    * @return This object.
    */
   public PathItem setParameters(List<Parameter> value) {
      parameters = value;
      return this;
   }

   /**
    * Sets the PATCH operation.
    *
    * @param value The new value for this property.
    * @return This object.
    */
   public PathItem setPatch(Operation value) {
      patch = value;
      return this;
   }

   /**
    * Sets the POST operation.
    *
    * @param value The new value for this property.
    * @return This object.
    */
   public PathItem setPost(Operation value) {
      post = value;
      return this;
   }

   /**
    * Sets the PUT operation.
    *
    * @param value The new value for this property.
    * @return This object.
    */
   public PathItem setPut(Operation value) {
      put = value;
      return this;
   }

   /**
    * Sets the servers list.
    *
    * @param value The new value for this property.
    * @return This object.
    */
   public PathItem setServers(List<Server> value) {
      servers = value;
      return this;
   }

   /**
    * Sets the summary.
    *
    * @param value The new value for this property.
    * @return This object.
    */
   public PathItem setSummary(String value) {
      summary = value;
      return this;
   }

   /**
    * Sets the TRACE operation.
    *
    * @param value The new value for this property.
    * @return This object.
    */
   public PathItem setTrace(Operation value) {
      trace = value;
      return this;
   }

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

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