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/*
 * Copyright 2013 Goodow.com
 * 
 * Licensed 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 com.goodow.realtime.json.js;

import com.goodow.realtime.json.JsonType;

import com.google.gwt.core.client.JavaScriptObject;

/**
 * JSO backed implementation of JsonValue.
 */
class JsJsonValue extends JavaScriptObject {

  // @formatter:off
  private static native String getJsType(Object obj) /*-{
    return typeof obj;
  }-*/;

  private static native boolean isArray(Object obj) /*-{
     // ensure that array detection works cross-frame
    return Object.prototype.toString.apply(obj) === '[object Array]';
  }-*/;

  private static native boolean isNull(JsJsonValue jsJsonValue) /*-{
    // TODO(cromwellian): if this moves to GWT, we may have to support more leniency
    return jsJsonValue === null;
  }-*/;
  // @formatter:on

  protected JsJsonValue() {
  }

  public final JsonType getType() {
    if (isNull(this)) {
      return JsonType.NULL;
    }
    String jsType = getJsType(this);
    if ("string".equals(jsType)) {
      return JsonType.STRING;
    } else if ("number".equals(jsType)) {
      return JsonType.NUMBER;
    } else if ("boolean".equals(jsType)) {
      return JsonType.BOOLEAN;
    } else if ("object".equals(jsType)) {
      return isArray(this) ? JsonType.ARRAY : JsonType.OBJECT;
    }
    assert false : "Unknown Json Type";
    return null;
  }

  // @formatter:off
  public final native String toJson() /*-{
    // skip hashCode field
    return $wnd.JSON.stringify(this, function(keyName, value) {
        if (keyName == "$H") {
          return undefined; // skip hashCode property
        }
        return value;
      }, 0);
  }-*/;
  // @formatter:on
}