/*
    * Copyright 2012 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.spdy;
  
  import io.netty.util.internal.StringUtil;
  
  import java.util.Map;
  import java.util.Set;
  import java.util.TreeMap;
  
  /**
   * The default {@link SpdySettingsFrame} implementation.
   */
  public class DefaultSpdySettingsFrame implements SpdySettingsFrame {
  
      private boolean clear;
      private final Map<Integer, Setting> settingsMap = new TreeMap<Integer, Setting>();
  
      @Override
      public Set<Integer> ids() {
          return settingsMap.keySet();
      }
  
      @Override
      public boolean isSet(int id) {
          return settingsMap.containsKey(id);
      }
  
      @Override
      public int getValue(int id) {
          final Setting setting = settingsMap.get(id);
          return setting != null ? setting.getValue() : -1;
      }
  
      @Override
      public SpdySettingsFrame setValue(int id, int value) {
          return setValue(id, value, false, false);
      }
  
      @Override
      public SpdySettingsFrame setValue(int id, int value, boolean persistValue, boolean persisted) {
          if (id < 0 || id > SpdyCodecUtil.SPDY_SETTINGS_MAX_ID) {
              throw new IllegalArgumentException("Setting ID is not valid: " + id);
          }
          final Integer key = Integer.valueOf(id);
          final Setting setting = settingsMap.get(key);
          if (setting != null) {
              setting.setValue(value);
              setting.setPersist(persistValue);
              setting.setPersisted(persisted);
          } else {
              settingsMap.put(key, new Setting(value, persistValue, persisted));
          }
          return this;
      }
  
      @Override
      public SpdySettingsFrame removeValue(int id) {
          settingsMap.remove(id);
          return this;
      }
  
      @Override
      public boolean isPersistValue(int id) {
          final Setting setting = settingsMap.get(id);
          return setting != null && setting.isPersist();
      }
  
      @Override
      public SpdySettingsFrame setPersistValue(int id, boolean persistValue) {
          final Setting setting = settingsMap.get(id);
          if (setting != null) {
              setting.setPersist(persistValue);
          }
          return this;
      }
  
      @Override
      public boolean isPersisted(int id) {
          final Setting setting = settingsMap.get(id);
          return setting != null && setting.isPersisted();
      }
  
      @Override
      public SpdySettingsFrame setPersisted(int id, boolean persisted) {
          final Setting setting = settingsMap.get(id);
         if (setting != null) {
             setting.setPersisted(persisted);
         }
         return this;
     }
 
     @Override
     public boolean clearPreviouslyPersistedSettings() {
         return clear;
     }
 
     @Override
     public SpdySettingsFrame setClearPreviouslyPersistedSettings(boolean clear) {
         this.clear = clear;
         return this;
     }
 
     private Set<Map.Entry<Integer, Setting>> getSettings() {
         return settingsMap.entrySet();
     }
 
     private void appendSettings(StringBuilder buf) {
         for (Map.Entry<Integer, Setting> e: getSettings()) {
             Setting setting = e.getValue();
             buf.append("--> ");
             buf.append(e.getKey());
             buf.append(':');
             buf.append(setting.getValue());
             buf.append(" (persist value: ");
             buf.append(setting.isPersist());
             buf.append("; persisted: ");
             buf.append(setting.isPersisted());
             buf.append(')');
             buf.append(StringUtil.NEWLINE);
         }
     }
 
     @Override
     public String toString() {
         StringBuilder buf = new StringBuilder()
             .append(StringUtil.simpleClassName(this))
             .append(StringUtil.NEWLINE);
         appendSettings(buf);
 
         buf.setLength(buf.length() - StringUtil.NEWLINE.length());
         return buf.toString();
     }
 
     private static final class Setting {
 
         private int value;
         private boolean persist;
         private boolean persisted;
 
         Setting(int value, boolean persist, boolean persisted) {
             this.value = value;
             this.persist = persist;
             this.persisted = persisted;
         }
 
         int getValue() {
             return value;
         }
 
         void setValue(int value) {
             this.value = value;
         }
 
         boolean isPersist() {
             return persist;
         }
 
         void setPersist(boolean persist) {
             this.persist = persist;
         }
 
         boolean isPersisted() {
             return persisted;
         }
 
         void setPersisted(boolean persisted) {
             this.persisted = persisted;
         }
     }
 }