/*
    * Copyright 2020 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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 io.netty.handler.codec.http3;
  
  import io.netty.util.internal.ObjectUtil;
  import io.netty.util.internal.StringUtil;
  import org.jetbrains.annotations.Nullable;
  
  import java.util.Iterator;
  import java.util.Map;
  
  /**
   * Default implementation of {@link Http3SettingsFrame}.
   *
   */
  public final class DefaultHttp3SettingsFrame implements Http3SettingsFrame {
  
      private final Http3Settings settings;
  
      public DefaultHttp3SettingsFrame(Http3Settings settings) {
          this.settings = ObjectUtil.checkNotNull(settings, "settings");
      }
  
      public DefaultHttp3SettingsFrame() {
          this.settings = new Http3Settings();
      }
  
      @Override
      public Http3Settings settings() {
          return settings;
      }
  
      /**
       * Get a setting by its key.
       *
       * @param key the HTTP/3 setting key
       * @return the value, or {@code null} if not set
       * @deprecated  use {@link #settings()}  and manipulate the {@link Http3Settings} directly
       */
      @Override
      @Deprecated
      @Nullable
      public Long get(long key) {
          // Legacy behavior: direct map access.
          return settings.get(key);
      }
  
      /**
       * Set a setting value by key.
       *
       * @param key the HTTP/3 setting key
       * @param value the value to set
       * @return the previous value, or {@code null} if none
       * @throws IllegalArgumentException if the key is reserved for HTTP/2
       * @deprecated  use {@link #settings()}  and manipulate the {@link Http3Settings} directly
       */
      @Override
      @Deprecated
      @Nullable
      public Long put(long key, Long value) {
          return settings.put(key, value);
      }
  
      @Override
      public Iterator<Map.Entry<Long, Long>> iterator() {
         return settings.iterator();
      }
  
      @Override
      public int hashCode() {
          return settings.hashCode();
      }
  
      @Override
      public boolean equals(Object o) {
          if (this == o) {
              return true;
          }
          if (o == null || getClass() != o.getClass()) {
              return false;
          }
          DefaultHttp3SettingsFrame that = (DefaultHttp3SettingsFrame) o;
          return that.settings.equals(settings);
      }
  
      @Override
     public String toString() {
         return StringUtil.simpleClassName(this) + "(settings=" + settings + ')';
     }
 
     /**
      * Creates a new {@link DefaultHttp3SettingsFrame} which is a copy of the given settings.
      *
      * @param settingsFrame the frame to copy.
      * @return              the newly created copy.
      */
     public static DefaultHttp3SettingsFrame copyOf(Http3SettingsFrame settingsFrame) {
         DefaultHttp3SettingsFrame copy = new DefaultHttp3SettingsFrame();
         if (settingsFrame instanceof DefaultHttp3SettingsFrame) {
             copy.settings.putAll(((DefaultHttp3SettingsFrame) settingsFrame).settings);
         } else {
             for (Map.Entry<Long, Long> entry: settingsFrame) {
                 copy.put(entry.getKey(), entry.getValue());
             }
         }
         return copy;
     }
 }