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// * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements.  See the NOTICE file *
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// * 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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// ***************************************************************************************************************************
package org.apache.juneau.dto.swagger;

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

import java.util.*;

import org.apache.juneau.*;
import org.apache.juneau.annotation.*;
import org.apache.juneau.json.*;
import org.apache.juneau.utils.*;

/**
 * Root class for all Swagger beans.
 *
 * <ul class='seealso'>
 *    <li class='link'>{@doc juneau-dto.Swagger}
 * </ul>
 */
public abstract class SwaggerElement {

   private boolean strict;
   private Map<String,Object> extra;

   SwaggerElement() {}

   SwaggerElement(SwaggerElement copyFrom) {
      this.strict = copyFrom.strict;
      this.extra = copyFrom.extra == null ? null : new LinkedHashMap<>(copyFrom.extra);
   }

   /**
    * Returns <jk>true</jk> if contents should be validated per the Swagger spec.
    *
    * @return <jk>true</jk> if contents should be validated per the Swagger spec.
    */
   protected boolean isStrict() {
      return strict;
   }

   /**
    * Sets strict mode on this bean.
    *
    * @return This object (for method chaining).
    */
   protected SwaggerElement strict() {
      strict = true;
      return this;
   }

   /**
    * Sets strict mode on this bean.
    *
    * @param value
    *    The new value for this property.
    *    <br>Non-boolean values will be converted to boolean using <code>Boolean.<jsm>valueOf</jsm>(value.toString())</code>.
    *    <br>Can be <jk>null</jk> (interpreted as <jk>false</jk>).
    * @return This object (for method chaining).
    */
   protected SwaggerElement strict(Object value) {
      strict = value == null ? false : toBoolean(value);
      return this;
   }

   /**
    * Generic property getter.
    *
    * <p>
    * Can be used to retrieve non-standard Swagger fields such as <js>"$ref"</js>.
    *
    * @param property The property name to retrieve.
    * @param type The datatype to cast the value to.
    * @return The property value, or <jk>null</jk> if the property does not exist or is not set.
    */
   public <T> T get(String property, Class<T> type) {
      if (property == null)
         return null;
      switch (property) {
         case "strict": return toType(isStrict(), type);
         default: return toType(get(property), type);
      }
   };

   /**
    * Generic property getter.
    *
    * <p>
    * Can be used to retrieve non-standard Swagger fields such as <js>"$ref"</js>.
    *
    * @param property The property name to retrieve.
    * @return The property value, or <jk>null</jk> if the property does not exist or is not set.
    */
   @Beanp("*")
   public Object get(String property) {
      if (property == null || extra == null)
         return null;
      return extra.get(property);
   };

   /**
    * Generic property setter.
    *
    * <p>
    * Can be used to set non-standard Swagger fields such as <js>"$ref"</js>.
    *
    * @param property The property name to set.
    * @param value The new value for the property.
    * @return This object (for method chaining).
    */
   @Beanp("*")
   public SwaggerElement set(String property, Object value) {
      if (property == null)
         return this;
      switch (property) {
         case "strict": return strict(value);
         default:
            if (extra == null)
               extra = new LinkedHashMap<>();
            extra.put(property, value);
            return this;
      }
   }

   /**
    * Generic property keyset.
    *
    * @return
    *    All the non-standard keys on this element.
    *    <br>Never <jk>null</jk>.
    */
   @Beanp("*")
   public Set<String> extraKeys() {
      return extra == null ? Collections.emptySet() : extra.keySet();
   }

   /**
    * Returns all the keys on this element.
    *
    * @return
    *    All the keys on this element.
    *    <br>Never <jk>null</jk>.
    */
   public Set<String> keySet() {
      ASet<String> s = new ASet<String>()
         .appendIf(strict, "strict");
      s.addAll(extraKeys());
      return s;
   }

   /**
    * Returns a copy of this swagger element as a modifiable map.
    *
    * <p>
    * Each call produces a new map.
    *
    * @return A map containing all the values in this swagger element.
    */
   public ObjectMap asMap() {
      ObjectMap m = new ObjectMap();
      for (String s : keySet())
         m.put(s, get(s, Object.class));
      return m;
   }

   @Override /* Object */
   public String toString() {
      return JsonSerializer.DEFAULT.toString(this);
   }
}