/*
 * 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.CollectionUtils.*;
import static org.apache.juneau.bean.openapi3.OpenApiCopyUtils.*;
import static org.apache.juneau.commons.utils.Shorts.*;
import static org.apache.juneau.marshall.internal.ConverterUtils.*;

import java.util.*;

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

/**
 * Allows the definition of input and output data types.
 *
 * <p>
 * The Schema Object allows the definition of input and output data types, including objects, primitives, and arrays.
 * This object is an extended subset of the JSON Schema Specification Draft 4, with additional extensions provided
 * by the OpenAPI Specification to allow for more complete documentation.
 *
 * <h5 class='section'>OpenAPI Specification:</h5>
 * <p>
 * The Schema Object supports all properties from JSON Schema Draft 4, including but not limited to:
 * <ul class='spaced-list'>
 *    <li><c>type</c> (string) - The data type. Values: <js>"string"</js>, <js>"number"</js>, <js>"integer"</js>, <js>"boolean"</js>, <js>"array"</js>, <js>"object"</js>
 *    <li><c>format</c> (string) - The format modifier (e.g., <js>"int32"</js>, <js>"int64"</js>, <js>"float"</js>, <js>"double"</js>, <js>"date"</js>, <js>"date-time"</js>)
 *    <li><c>title</c> (string) - A short title for the schema
 *    <li><c>description</c> (string) - A description of the schema (CommonMark syntax may be used)
 *    <li><c>default</c> (any) - The default value
 *    <li><c>multipleOf</c> (number) - Must be a multiple of this value
 *    <li><c>maximum</c> (number) - Maximum value (inclusive by default)
 *    <li><c>exclusiveMaximum</c> (boolean) - If true, maximum is exclusive
 *    <li><c>minimum</c> (number) - Minimum value (inclusive by default)
 *    <li><c>exclusiveMinimum</c> (boolean) - If true, minimum is exclusive
 *    <li><c>maxLength</c> (integer) - Maximum string length
 *    <li><c>minLength</c> (integer) - Minimum string length
 *    <li><c>pattern</c> (string) - Regular expression pattern the string must match
 *    <li><c>maxItems</c> (integer) - Maximum array length
 *    <li><c>minItems</c> (integer) - Minimum array length
 *    <li><c>uniqueItems</c> (boolean) - If true, array items must be unique
 *    <li><c>maxProperties</c> (integer) - Maximum number of object properties
 *    <li><c>minProperties</c> (integer) - Minimum number of object properties
 *    <li><c>required</c> (array of string) - Required property names
 *    <li><c>enum</c> (array) - Possible values for this schema
 *    <li><c>properties</c> (map of {@link SchemaInfo}) - Object property definitions
 *    <li><c>items</c> ({@link Items}) - Schema for array items
 *    <li><c>allOf</c> (array of {@link SchemaInfo}) - Must validate against all schemas
 *    <li><c>oneOf</c> (array of {@link SchemaInfo}) - Must validate against exactly one schema
 *    <li><c>anyOf</c> (array of {@link SchemaInfo}) - Must validate against any schema
 *    <li><c>not</c> ({@link SchemaInfo}) - Must not validate against this schema
 *    <li><c>nullable</c> (boolean) - Allows the value to be null (OpenAPI 3.0 extension)
 *    <li><c>discriminator</c> ({@link Discriminator}) - Discriminator for polymorphism (OpenAPI extension)
 *    <li><c>readOnly</c> (boolean) - Relevant only for Schema properties (OpenAPI extension)
 *    <li><c>writeOnly</c> (boolean) - Relevant only for Schema properties (OpenAPI extension)
 *    <li><c>xml</c> ({@link Xml}) - XML representation details (OpenAPI extension)
 *    <li><c>externalDocs</c> ({@link ExternalDocumentation}) - Additional external documentation (OpenAPI extension)
 *    <li><c>example</c> (any) - Example value (OpenAPI extension)
 *    <li><c>deprecated</c> (boolean) - Specifies that the schema is deprecated (OpenAPI extension)
 * </ul>
 *
 * <h5 class='section'>Example:</h5>
 * <p class='bjava'>
 *    <jc>// Create a schema for a Pet object</jc>
 *    SchemaInfo <jv>schema</jv> = <jk>new</jk> SchemaInfo()
 *       .setType(<js>"object"</js>)
 *       .setRequired(<js>"id"</js>, <js>"name"</js>)
 *       .setProperties(
 *          JsonMap.<jsm>of</jsm>(
 *             <js>"id"</js>, <jk>new</jk> SchemaInfo().setType(<js>"integer"</js>).setFormat(<js>"int64"</js>),
 *             <js>"name"</js>, <jk>new</jk> SchemaInfo().setType(<js>"string"</js>),
 *             <js>"tag"</js>, <jk>new</jk> SchemaInfo().setType(<js>"string"</js>)
 *          )
 *       );
 * </p>
 *
 * <h5 class='section'>See Also:</h5><ul>
 *    <li class='link'><a class="doclink" href="https://spec.openapis.org/oas/v3.0.0#schema-object">OpenAPI Specification &gt; Schema Object</a>
 *    <li class='link'><a class="doclink" href="https://swagger.io/docs/specification/data-models/">OpenAPI Data Models</a>
 *    <li class='link'><a class="doclink" href="https://json-schema.org/">JSON Schema Specification</a>
 *    <li class='link'><a class="doclink" href="https://juneau.apache.org/docs/topics/JuneauBeanOpenApi3">juneau-bean-openapi-v3</a>
 * </ul>
 */
@SuppressWarnings({
   "java:S116", // Field names intentionally match JSON property names
   "java:S1192", // Duplicated literals (argument/property names) read more clearly inline than as constants
   "java:S1479" // Switch statement has 37 cases, exceeding recommended limit of 30 - necessary for bean property mapping
})
public class SchemaInfo extends OpenApiElement {

   private String format;
   private String title;
   private String description;
   private String pattern;
   private String ref;
   private String type;
   private Number multipleOf;
   private Number maximum;
   private Number minimum;
   private Integer maxLength;
   private Integer minLength;
   private Integer maxItems;
   private Integer minItems;
   private Integer maxProperties;
   private Integer minProperties;
   private Boolean exclusiveMaximum;
   private Boolean exclusiveMinimum;
   private Boolean uniqueItems;
   private Boolean nullable;
   private Boolean writeOnly;
   private Boolean readOnly;
   private Boolean deprecated;
   private Object default_;
   private Object example;
   private Items items;
   private Xml xml;
   private ExternalDocumentation externalDocs;
   private final List<Object> allOf = list();
   private final List<Object> oneOf = list();
   private final List<Object> anyOf = list();
   private final List<Object> enum_ = list();
   private final List<String> required = list();
   private Discriminator discriminator;
   private Map<String,SchemaInfo> properties;
   private SchemaInfo additionalProperties;
   private SchemaInfo not;

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

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

      this.format = copyFrom.format;
      this.title = copyFrom.title;
      this.description = copyFrom.description;
      this.ref = copyFrom.ref;
      this.nullable = copyFrom.nullable;
      this.writeOnly = copyFrom.writeOnly;
      this.deprecated = copyFrom.deprecated;
      this.pattern = copyFrom.pattern;
      this.type = copyFrom.type;
      this.discriminator = copyOf(copyFrom.discriminator);
      this.multipleOf = copyFrom.multipleOf;
      this.maximum = copyFrom.maximum;
      this.minimum = copyFrom.minimum;
      this.maxLength = copyFrom.maxLength;
      this.minLength = copyFrom.minLength;
      this.maxItems = copyFrom.maxItems;
      this.minItems = copyFrom.minItems;
      this.maxProperties = copyFrom.maxProperties;
      this.minProperties = copyFrom.minProperties;
      this.exclusiveMaximum = copyFrom.exclusiveMaximum;
      this.exclusiveMinimum = copyFrom.exclusiveMinimum;
      this.uniqueItems = copyFrom.uniqueItems;
      this.readOnly = copyFrom.readOnly;
      this.default_ = copyFrom.default_;
      this.example = copyFrom.example;
      this.items = copyOf(copyFrom.items);
      this.xml = copyOf(copyFrom.xml);
      this.externalDocs = copyOf(copyFrom.externalDocs);
      enum_.addAll(copyFrom.enum_);
      allOf.addAll(copyFrom.allOf);
      required.addAll(copyFrom.required);
      anyOf.addAll(copyFrom.anyOf);
      oneOf.addAll(copyFrom.oneOf);
      this.properties = copyOf(copyFrom.properties, SchemaInfo::copy);
      this.additionalProperties = copyOf(copyFrom.additionalProperties);
      this.not = copyOf(copyFrom.not);
   }

   /**
    * Adds one or more values to the <property>allOf</property> property.
    *
    * @param values
    *    The values to add to this property.
    *    <br>Valid types:
    *    <ul>
    *       <li><code>Object</code>
    *       <li><code>Collection&lt;Object&gt;</code>
    *       <li><code>String</code> - JSON array representation of <code>Collection&lt;Object&gt;</code>
    *          <h5 class='figure'>Example:</h5>
    *          <p class='bcode'>
    *    allOf(<js>"['foo','bar']"</js>);
    *          </p>
    *       <li><code>String</code> - Individual values
    *          <h5 class='figure'>Example:</h5>
    *          <p class='bcode'>
    *    allOf(<js>"foo"</js>, <js>"bar"</js>);
    *          </p>
    *    </ul>
    *    <br>Ignored if <jk>null</jk>.
    * @return This object
    */
   public SchemaInfo addAllOf(Object...values) {
      addAllNn(allOf, values);
      return this;
   }

   /**
    * Adds one or more values to the <property>anyOf</property> property.
    *
    * @param values
    *    The values to add to this property.
    *    <br>Valid types:
    *    <ul>
    *       <li><code>Object</code>
    *       <li><code>Collection&lt;Object&gt;</code>
    *       <li><code>String</code> - JSON array representation of <code>Collection&lt;Object&gt;</code>
    *          <h5 class='figure'>Example:</h5>
    *          <p class='bcode'>
    *    anyOf(<js>"['foo','bar']"</js>);
    *          </p>
    *       <li><code>String</code> - Individual values
    *          <h5 class='figure'>Example:</h5>
    *          <p class='bcode'>
    *    anyOf(<js>"foo"</js>, <js>"bar"</js>);
    *          </p>
    *    </ul>
    *    <br>Ignored if <jk>null</jk>.
    * @return This object
    */
   public SchemaInfo addAnyOf(Object...values) {
      addAllNn(anyOf, values);
      return this;
   }

   /**
    * Adds one or more values to the <property>enum</property> property.
    *
    * @param values
    *    The values to add to this property.
    *    <br>Valid types:
    *    <ul>
    *       <li><code>Object</code>
    *       <li><code>Collection&lt;Object&gt;</code>
    *       <li><code>String</code> - JSON array representation of <code>Collection&lt;Object&gt;</code>
    *          <h5 class='figure'>Example:</h5>
    *          <p class='bcode'>
    *    enum_(<js>"['foo','bar']"</js>);
    *          </p>
    *       <li><code>String</code> - Individual values
    *          <h5 class='figure'>Example:</h5>
    *          <p class='bcode'>
    *    enum_(<js>"foo"</js>, <js>"bar"</js>);
    *          </p>
    *    </ul>
    *    <br>Ignored if <jk>null</jk>.
    * @return This object
    */
   public SchemaInfo addEnum(Object...values) {
      addAllNn(enum_, values);
      return this;
   }

   /**
    * Adds one or more values to the <property>oneOf</property> property.
    *
    * @param values
    *    The values to add to this property.
    *    <br>Valid types:
    *    <ul>
    *       <li><code>Object</code>
    *       <li><code>Collection&lt;Object&gt;</code>
    *       <li><code>String</code> - JSON array representation of <code>Collection&lt;Object&gt;</code>
    *          <h5 class='figure'>Example:</h5>
    *          <p class='bcode'>
    *    oneOf(<js>"['foo','bar']"</js>);
    *          </p>
    *       <li><code>String</code> - Individual values
    *          <h5 class='figure'>Example:</h5>
    *          <p class='bcode'>
    *    oneOf(<js>"foo"</js>, <js>"bar"</js>);
    *          </p>
    *    </ul>
    *    <br>Ignored if <jk>null</jk>.
    * @return This object
    */
   public SchemaInfo addOneOf(Object...values) {
      addAllNn(oneOf, values);
      return this;
   }

   /**
    * Bean property appender:  <property>properties</property>.
    *
    * @param key The property key.  Must not be <jk>null</jk>, or an {@link IllegalArgumentException} is thrown.
    * @param value The property value.  Must not be <jk>null</jk>, or an {@link IllegalArgumentException} is thrown.
    * @return This object.
    */
   public SchemaInfo addProperty(String key, SchemaInfo value) {
      reqnn("key", key);
      reqnn("value", value);
      if (properties == null)
         properties = map();
      properties.put(key, value);
      return this;
   }

   /**
    * Same as {@link #addRequired(String...)}.
    *
    * @param values
    *    The new value for this property.
    *    <br>Valid types:
    *    <ul>
    *       <li><code>Collection&lt;String&gt;</code>
    *       <li><code>String</code> - JSON array representation of <code>Collection&lt;String&gt;</code>
    *          <h5 class='figure'>Example:</h5>
    *          <p class='bcode'>
    *    schemes(<js>"['scheme1','scheme2']"</js>);
    *          </p>
    *       <li><code>String</code> - Individual values
    *          <h5 class='figure'>Example:</h5>
    *          <p class='bcode'>
    *    schemes(<js>"scheme1</js>, <js>"scheme2"</js>);
    *          </p>
    *    </ul>
    * @return This object
    */
   public SchemaInfo addRequired(String...values) {
      addAllNn(required, values);
      return this;
   }

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

   @Override /* Overridden from SwaggerElement */
   public <T> T get(String property, Class<T> type) {
      reqnn("property", property);
      return switch (property) {
         case "format" -> toType(getFormat(), type);
         case "title" -> toType(getTitle(), type);
         case "description" -> toType(getDescription(), type);
         case "default" -> toType(getDefault(), type);
         case "multipleOf" -> toType(getMultipleOf(), type);
         case "maximum" -> toType(getMaximum(), type);
         case "exclusiveMaximum" -> toType(getExclusiveMaximum(), type);
         case "minimum" -> toType(getMinimum(), type);
         case "exclusiveMinimum" -> toType(getExclusiveMinimum(), type);
         case "maxLength" -> toType(getMaxLength(), type);
         case "minLength" -> toType(getMinLength(), type);
         case "pattern" -> toType(getPattern(), type);
         case "maxItems" -> toType(getMaxItems(), type);
         case "minItems" -> toType(getMinItems(), type);
         case "uniqueItems" -> toType(getUniqueItems(), type);
         case "maxProperties" -> toType(getMaxProperties(), type);
         case "minProperties" -> toType(getMinProperties(), type);
         case "required" -> toType(getRequired(), type);
         case "enum" -> toType(getEnum(), type);
         case "type" -> toType(getType(), type);
         case "items" -> toType(getItems(), type);
         case "allOf" -> toType(getAllOf(), type);
         case "oneOf" -> toType(getOneOf(), type);
         case "anyOf" -> toType(getAnyOf(), type);
         case "properties" -> toType(getProperties(), type);
         case "additionalProperties" -> toType(getAdditionalProperties(), type);
         case "not" -> toType(getNot(), type);
         case "nullable" -> toType(getNullable(), type);
         case "deprecated" -> toType(getDeprecated(), type);
         case "discriminator" -> toType(getDiscriminator(), type);
         case "readOnly" -> toType(getReadOnly(), type);
         case "writeOnly" -> toType(getWriteOnly(), type);
         case "xml" -> toType(getXml(), type);
         case "externalDocs" -> toType(getExternalDocs(), type);
         case "example" -> toType(getExample(), type);
         case "$ref" -> toType(getRef(), type);
         default -> super.get(property, type);
      };
   }

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

   /**
    * Bean property getter:  <property>allOf</property>.
    *
    * @return The property value, or <jk>null</jk> if it is not set.
    */
   public List<Object> getAllOf() { return nie(allOf); }

   /**
    * Bean property getter:  <property>anyOf</property>.
    *
    * @return The property value, or <jk>null</jk> if it is not set.
    */
   public List<Object> getAnyOf() { return nie(anyOf); }

   /**
    * Bean property getter:  <property>default</property>.
    *
    * <p>
    * Unlike JSON Schema, the value MUST conform to the defined type for the Schema Object.
    *
    * @return The property value, or <jk>null</jk> if it is not set.
    */
   public Object getDefault() { return default_; }

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

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

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

   /**
    * Bean property getter:  <property>enum</property>.
    *
    * @return The property value, or <jk>null</jk> if it is not set.
    */
   public List<Object> getEnum() { return nie(enum_); }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

   /**
    * Bean property getter:  <property>oneOf</property>.
    *
    * @return The property value, or <jk>null</jk> if it is not set.
    */
   public List<Object> getOneOf() { return nie(oneOf); }

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

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

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

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

   /**
    * Bean property getter:  <property>required</property>.
    *
    * <p>
    * The list of required properties.
    *
    * <p>
    * <b>Note:</b> Named/typed <c>required</c> (<c>List&lt;String&gt;</c>) here per the OpenAPI 3.x JSON Schema
    * subset, vs. <c>requiredProperties</c> (<c>Set&lt;String&gt;</c>) in swagger-v2's sibling
    * {@code org.apache.juneau.bean.swagger.SchemaInfo}. This is an intentional, maintainer-confirmed divergence
    * (PARITY-02): each module tracks its own spec version's canonical field name/type; swagger-v2 additionally
    * carries a separate boolean {@code getRequired()}/{@code setRequired(Boolean)} pair that this module has no
    * equivalent for. No rename/retype planned.
    *
    * @return The property value, or <jk>null</jk> if it is not set.
    */
   public List<String> getRequired() { return nie(required); }

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

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

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

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

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

   @Override /* Overridden from SwaggerElement */
   public Set<String> keySet() {
      // @formatter:off
      var s = stb(String.class)
         .addIf(nn(ref), "$ref")
         .addIf(nn(additionalProperties), "additionalProperties")
         .addIf(ine(allOf), "allOf")
         .addIf(ine(anyOf), "anyOf")
         .addIf(nn(default_), "default")
         .addIf(nn(deprecated), "deprecated")
         .addIf(nn(description), "description")
         .addIf(nn(discriminator), "discriminator")
         .addIf(ine(enum_), "enum")
         .addIf(nn(example), "example")
         .addIf(nn(exclusiveMaximum), "exclusiveMaximum")
         .addIf(nn(exclusiveMinimum), "exclusiveMinimum")
         .addIf(nn(externalDocs), "externalDocs")
         .addIf(nn(format), "format")
         .addIf(nn(items), "items")
         .addIf(nn(maxItems), "maxItems")
         .addIf(nn(maxLength), "maxLength")
         .addIf(nn(maxProperties), "maxProperties")
         .addIf(nn(maximum), "maximum")
         .addIf(nn(minItems), "minItems")
         .addIf(nn(minLength), "minLength")
         .addIf(nn(minProperties), "minProperties")
         .addIf(nn(minimum), "minimum")
         .addIf(nn(multipleOf), "multipleOf")
         .addIf(nn(not), "not")
         .addIf(nn(nullable), "nullable")
         .addIf(ine(oneOf), "oneOf")
         .addIf(nn(pattern), "pattern")
         .addIf(nn(properties), "properties")
         .addIf(nn(readOnly), "readOnly")
         .addIf(ine(required), "required")
         .addIf(nn(title), "title")
         .addIf(nn(type), "type")
         .addIf(nn(uniqueItems), "uniqueItems")
         .addIf(nn(writeOnly), "writeOnly")
         .addIf(nn(xml), "xml")
         .build();
      // @formatter:on
      return new MultiSet<>(s, super.keySet());
   }

   /**
    * Resolves any <js>"$ref"</js> attributes in this element.
    *
    * @param openApi The swagger document containing the definitions.
    * @param refStack Keeps track of previously-visited references so that we don't cause recursive loops.
    * @param maxDepth
    *    The maximum depth to resolve references.
    *    <br>After that level is reached, <code>$ref</code> references will be left alone.
    *    <br>Useful if you have very complex models and you don't want your swagger page to be overly-complex.
    * @return
    *    This object with references resolved.
    *    <br>May or may not be the same object.
    */
   public SchemaInfo resolveRefs(OpenApi openApi, Deque<String> refStack, int maxDepth) {

      if (nn(ref)) {
         if (refStack.contains(ref) || refStack.size() >= maxDepth)
            return this;
         refStack.addLast(ref);
         var r = openApi.findRef(ref, SchemaInfo.class);
         r = r.resolveRefs(openApi, refStack, maxDepth);
         refStack.removeLast();
         return r;
      }

      if (nn(items))
         items = items.resolveRefs(openApi, refStack, maxDepth);

      if (nn(properties))
         for (var e : properties.entrySet())
            e.setValue(e.getValue().resolveRefs(openApi, refStack, maxDepth));

      if (nn(additionalProperties))
         additionalProperties = additionalProperties.resolveRefs(openApi, refStack, maxDepth);

      this.example = null;

      return this;
   }

   @Override /* Overridden from SwaggerElement */
   public SchemaInfo set(String property, Object value) {
      reqnn("property", property);
      return switch (property) {
         case "$ref" -> setRef(value);
         case "additionalProperties" -> setAdditionalProperties(toType(value, SchemaInfo.class));
         case "allOf" -> setAllOf(lb(Object.class).addAny(value).sparse().build());
         case "anyOf" -> setAnyOf(lb(Object.class).addAny(value).sparse().build());
         case "default" -> setDefault(value);
         case "deprecated" -> setDeprecated(toBoolean(value));
         case "description" -> setDescription(s(value));
         case "discriminator" -> setDiscriminator(toType(value, Discriminator.class));
         case "enum" -> setEnum(lb(Object.class).addAny(value).sparse().build());
         case "example" -> setExample(value);
         case "exclusiveMaximum" -> setExclusiveMaximum(toBoolean(value));
         case "exclusiveMinimum" -> setExclusiveMinimum(toBoolean(value));
         case "externalDocs" -> setExternalDocs(toType(value, ExternalDocumentation.class));
         case "format" -> setFormat(s(value));
         case "items" -> setItems(toType(value, Items.class));
         case "maxItems" -> setMaxItems(toInteger(value));
         case "maxLength" -> setMaxLength(toInteger(value));
         case "maxProperties" -> setMaxProperties(toInteger(value));
         case "maximum" -> setMaximum(toNumber(value));
         case "minItems" -> setMinItems(toInteger(value));
         case "minLength" -> setMinLength(toInteger(value));
         case "minProperties" -> setMinProperties(toInteger(value));
         case "minimum" -> setMinimum(toNumber(value));
         case "multipleOf" -> setMultipleOf(toNumber(value));
         case "not" -> setNot(toType(value, SchemaInfo.class));
         case "nullable" -> setNullable(toBoolean(value));
         case "oneOf" -> setOneOf(lb(Object.class).addAny(value).sparse().build());
         case "pattern" -> setPattern(s(value));
         case "properties" -> setProperties(toMapBuilder(value, String.class, SchemaInfo.class).sparse().build());
         case "readOnly" -> setReadOnly(toBoolean(value));
         case "required" -> setRequired(lb(String.class).addAny(value).sparse().build());
         case "title" -> setTitle(s(value));
         case "type" -> setType(s(value));
         case "uniqueItems" -> setUniqueItems(toBoolean(value));
         case "writeOnly" -> setWriteOnly(toBoolean(value));
         case "xml" -> setXml(toType(value, Xml.class));
         default -> {
            super.set(property, value);
            yield this;
         }
      };
   }

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

   /**
    * Bean property setter:  <property>allOf</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setAllOf(Collection<Object> value) {
      allOf.clear();
      if (nn(value))
         allOf.addAll(value);
      return this;
   }

   /**
    * Bean property setter:  <property>anyOf</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setAnyOf(Collection<Object> value) {
      anyOf.clear();
      if (nn(value))
         anyOf.addAll(value);
      return this;
   }

   /**
    * Bean property setter:  <property>default</property>.
    *
    * <p>
    * Unlike JSON Schema, the value MUST conform to the defined type for the Schema Object.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setDefault(Object value) {
      default_ = value;
      return this;
   }

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

   /**
    * Bean property setter:  <property>discriminator</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setDiscriminator(Discriminator value) {
      discriminator = value;
      return this;
   }

   /**
    * Bean property setter:  <property>enum</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setEnum(Collection<Object> value) {
      enum_.clear();
      if (nn(value))
         enum_.addAll(value);
      return this;
   }

   /**
    * Bean property setter:  <property>example</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setExample(Object value) {
      example = value;
      return this;
   }

   /**
    * Bean property setter:  <property>exclusiveMaximum</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setExclusiveMaximum(Boolean value) {
      exclusiveMaximum = value;
      return this;
   }

   /**
    * Bean property setter:  <property>exclusiveMinimum</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setExclusiveMinimum(Boolean value) {
      exclusiveMinimum = value;
      return this;
   }

   /**
    * Bean property setter:  <property>externalDocs</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setExternalDocs(ExternalDocumentation value) {
      externalDocs = value;
      return this;
   }

   /**
    * Bean property setter:  <property>format</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    *    <br>Formats defined by the OAS include:
    *    <ul>
    *       <li><js>"int32"</js>
    *       <li><js>"int64"</js>
    *       <li><js>"float"</js>
    *       <li><js>"double"</js>
    *       <li><js>"byte"</js>
    *       <li><js>"binary"</js>
    *       <li><js>"date"</js>
    *       <li><js>"date-time"</js>
    *       <li><js>"password"</js>
    *    </ul>
    * @return This object
    */
   public SchemaInfo setFormat(String value) {
      format = value;
      return this;
   }

   /**
    * Bean property setter:  <property>items</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setItems(Items value) {
      items = value;
      return this;
   }

   /**
    * Bean property setter:  <property>maximum</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setMaximum(Number value) {
      maximum = value;
      return this;
   }

   /**
    * Bean property setter:  <property>maxItems</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setMaxItems(Integer value) {
      maxItems = value;
      return this;
   }

   /**
    * Bean property setter:  <property>maxLength</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setMaxLength(Integer value) {
      maxLength = value;
      return this;
   }

   /**
    * Bean property setter:  <property>maxProperties</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setMaxProperties(Integer value) {
      maxProperties = value;
      return this;
   }

   /**
    * Bean property setter:  <property>minimum</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setMinimum(Number value) {
      minimum = value;
      return this;
   }

   /**
    * Bean property setter:  <property>minItems</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setMinItems(Integer value) {
      minItems = value;
      return this;
   }

   /**
    * Bean property setter:  <property>minLength</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setMinLength(Integer value) {
      minLength = value;
      return this;
   }

   /**
    * Bean property setter:  <property>minProperties</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setMinProperties(Integer value) {
      minProperties = value;
      return this;
   }

   /**
    * Bean property setter:  <property>multipleOf</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setMultipleOf(Number value) {
      multipleOf = value;
      return this;
   }

   /**
    * Bean property setter:  <property>not</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setNot(SchemaInfo value) {
      not = value;
      return this;
   }

   /**
    * Bean property setter:  <property>nullable</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setNullable(Boolean value) {
      nullable = value;
      return this;
   }

   /**
    * Bean property setter:  <property>oneOf</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setOneOf(Collection<Object> value) {
      oneOf.clear();
      if (nn(value))
         oneOf.addAll(value);
      return this;
   }

   /**
    * Bean property setter:  <property>pattern</property>.
    *
    * <p>
    * This string SHOULD be a valid regular expression.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setPattern(String value) {
      pattern = value;
      return this;
   }

   /**
    * Bean property setter:  <property>properties</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setProperties(Map<String,SchemaInfo> value) {
      properties = copyOf(value);
      return this;
   }

   /**
    * Bean property setter:  <property>readOnly</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setReadOnly(Boolean value) {
      readOnly = value;
      return this;
   }

   /**
    * Bean property setter:  <property>$ref</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   @BeanProp("$ref")
   public SchemaInfo setRef(Object value) {
      ref = s(value);
      return this;
   }

   /**
    * Bean property setter:  <property>required</property>.
    *
    * <p>
    * The list of required properties.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setRequired(Collection<String> value) {
      required.clear();
      if (nn(value))
         required.addAll(value);
      return this;
   }

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

   /**
    * Bean property setter:  <property>type</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    *    <br>Possible values include:
    *    <ul>
    *       <li><js>"object"</js>
    *       <li><js>"string"</js>
    *       <li><js>"number"</js>
    *       <li><js>"integer"</js>
    *       <li><js>"boolean"</js>
    *       <li><js>"array"</js>
    *       <li><js>"file"</js>
    *    </ul>
    * @return This object
    */
   public SchemaInfo setType(String value) {
      type = value;
      return this;
   }

   /**
    * Bean property setter:  <property>uniqueItems</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setUniqueItems(Boolean value) {
      uniqueItems = value;
      return this;
   }

   /**
    * Bean property setter:  <property>writeOnly</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setWriteOnly(Boolean value) {
      writeOnly = value;
      return this;
   }

   /**
    * Bean property setter:  <property>xml</property>.
    *
    * @param value
    *    The new value for this property.
    *    <br>Can be <jk>null</jk> to unset the property.
    * @return This object
    */
   public SchemaInfo setXml(Xml value) {
      xml = value;
      return this;
   }

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

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