/*
    * 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.myfaces.tobago.renderkit.html;
  
  import java.util.Map;
  
  public class JsonUtils {
  
    private JsonUtils() {
    }
  
    private static void encode(StringBuilder builder, String name, String[] value) {
      builder.append("\"");
      builder.append(name);
      builder.append("\":\"");
      boolean colon = false;
      for (String item : value) {
        if (colon) {
          builder.append(",");
        }
        builder.append(item);
        colon = true;
      }
      builder.append("\",");
    }
  
    static void encode(StringBuilder builder, String name, Boolean value) {
      builder.append("\"");
      builder.append(name);
      builder.append("\":");
      builder.append(Boolean.toString(value));
      builder.append(",");
    }
  
    static void encode(StringBuilder builder, String name, Integer value) {
      builder.append("\"");
      builder.append(name);
      builder.append("\":");
      builder.append(Integer.toString(value));
      builder.append(",");
    }
  
    static void encode(StringBuilder builder, String name, String value) {
      value = value.replaceAll("\\\"", "\\\\\\\"");
      builder.append("\"");
      builder.append(name);
      builder.append("\":\"");
      builder.append(value);
      builder.append("\",");
    }
  
    public static String encode(CommandMap commandMap) {
      StringBuilder builder = new StringBuilder();
      builder.append("{");
      int initialLength = builder.length();
  
      Command click = commandMap.getClick();
      if (click != null) {
        encode(builder, "click", click);
      }
  
      final Map<String, Command> other = commandMap.getOther();
      if (other != null) {
        for(Map.Entry<String, Command> entry : other.entrySet()) {
          encode(builder, entry.getKey(), entry.getValue());
        }
      }
  
      if (builder.length() - initialLength > 0) {
        assert builder.charAt(builder.length() - 1) == ',';
        builder.deleteCharAt(builder.length() - 1);
      }
  
      builder.append("}");
      return builder.toString();
    }
  
    static void encode(StringBuilder builder, String name, Command command) {
      builder.append("\"");
      builder.append(name);
      builder.append("\":{");
      int initialLength = builder.length();
 
     String action = command.getAction();
     if (action != null) {
       encode(builder, "action", action);
     }
     Boolean transition = command.getTransition();
     if (transition != null && !transition) { // true is the default, so encoding is needed.
       encode(builder, "transition", transition);
     }
     String target = command.getTarget();
     if (target != null) {
       encode(builder, "target", target);
     }
     String url = command.getUrl();
     if (url != null) {
       encode(builder, "url", url);
     }
     String[] partially = command.getPartially();
     if (partially != null && partially.length > 0) {
       encode(builder, "partially", partially);
     }
     String focus = command.getFocus();
     if (focus != null) {
       encode(builder, "focus", focus);
     }
     String confirmation = command.getConfirmation();
     if (confirmation != null) {
       encode(builder, "confirmation", confirmation);
     }
     Integer delay  = command.getDelay();
     if (delay != null) {
       encode(builder, "delay", delay);
     }
     Popup popup = command.getPopup();
     if (popup != null) {
       encode(builder, "popup", popup);
     }
     String script = command.getScript();
     if (script != null) {
       encode(builder, "script", script);
     }
 
     if (builder.length() - initialLength > 0) {
       assert builder.charAt(builder.length() - 1) == ',';
       builder.deleteCharAt(builder.length() - 1);
     }
 
     builder.append("},");
   }
 
   static void encode(StringBuilder builder, String name, Popup popup) {
     builder.append("\"");
     builder.append(name);
     builder.append("\":{");
     int initialLength = builder.length();
 
     String command = popup.getCommand();
     if (command != null) {
       encode(builder, "command", command);
     }
     Boolean immediate = popup.isImmediate();
     if (immediate != null) {
       encode(builder, "immediate", immediate);
     }
     if (builder.length() - initialLength > 0) {
       assert builder.charAt(builder.length() - 1) == ',';
       builder.deleteCharAt(builder.length() - 1);
     }
 
     builder.append("},");
   }
 
 }