/**

  * Back 2 Browser Bytecode Translator

  * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

  *

  * This program is free software: you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation, version 2 of the License.

  *

  * This program is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License

  * along with this program. Look for COPYING file in the top folder.

  * If not, see http://opensource.org/licenses/GPL-2.0.

  */

 package org.apidesign.bck2brwsr.htmlpage;

 import org.apidesign.bck2brwsr.core.JavaScriptBody;

 /**

  *

  * @author Jaroslav Tulach <jtulach@netbeans.org>

  */

 public final class ConvertTypes {

     ConvertTypes() {

     }

     public static String toString(Object object, String property) {

         Object ret = getProperty(object, property);

         return ret == null ? null : ret.toString();

     }

     public static double toDouble(Object object, String property) {

         Object ret = getProperty(object, property);

         return ret instanceof Number ? ((Number)ret).doubleValue() : Double.NaN;

     }

     public static int toInt(Object object, String property) {

         Object ret = getProperty(object, property);

         return ret instanceof Number ? ((Number)ret).intValue() : Integer.MIN_VALUE;

     }

     public static <T> T toModel(Class<T> modelClass, Object object, String property) {

         Object ret = getProperty(object, property);

         if (ret == null || modelClass.isInstance(ret)) {

             return modelClass.cast(ret);

         }

         throw new IllegalStateException("Value " + ret + " is not of type " + modelClass);

     }

     public static String toJSON(Object value) {

         if (value == null) {

             return "null";

         }

         if (value instanceof Enum) {

             value = value.toString();

         }

         if (value instanceof String) {

             return '"' + 

                 ((String)value).

                     replace("\"", "\\\"").

                     replace("\n", "\\n").

                     replace("\r", "\\r").

                     replace("\t", "\\t")

                 + '"';

         }

         return value.toString();

     }

     @JavaScriptBody(args = { "object", "property" },

         body = "if (property === null) return object;\n"

         + "var p = object[property]; return p ? p : null;"

     )

     private static Object getProperty(Object object, String property) {

         return null;

     }

     public static String createJSONP(Object[] jsonResult, Runnable whenDone) {

         int h = whenDone.hashCode();

         String name;

         for (;;) {

             name = "jsonp" + Integer.toHexString(h);

             if (defineIfUnused(name, jsonResult, whenDone)) {

                 return name;

             }

             h++;

         }

     }

     @JavaScriptBody(args = { "name", "arr", "run" }, body = 

         "if (window[name]) return false;\n "

       + "window[name] = function(data) {\n "

       + "  delete window[name];\n"

       + "  var el = window.document.getElementById(name);\n"

       + "  el.parentNode.removeChild(el);\n"

       + "  arr[0] = data;\n"

       + "  run.run__V();\n"

       + "};\n"

       + "return true;\n"

     )

     private static boolean defineIfUnused(String name, Object[] arr, Runnable run) {

         return true;

     }

     @JavaScriptBody(args = { "url", "arr", "callback" }, body = ""

         + "var request = new XMLHttpRequest();\n"

         + "request.open('GET', url, true);\n"

         + "request.setRequestHeader('Content-Type', 'application/json; charset=utf-8');\n"

         + "request.onreadystatechange = function() {\n"

         + "  if (this.readyState!==4) return;\n"

         + "  try {\n"

         + "    arr[0] = eval('(' + this.response + ')');\n"

         + "  } catch (error) {;\n"

         + "    throw 'Cannot parse' + error + ':' + this.response;\n"

         + "  };\n"

         + "  callback.run__V();\n"

         + "};"

         + "request.send();"

     )

     private static void loadJSON(

         String url, Object[] jsonResult, Runnable whenDone

     ) {

     }

     public static void loadJSON(

         String url, Object[] jsonResult, Runnable whenDone, String jsonp

     ) {

         if (jsonp == null) {

             loadJSON(url, jsonResult, whenDone);

         } else {

             loadJSONP(url, jsonp);

         }

     }

     @JavaScriptBody(args = { "url", "jsonp" }, body = 

         "var scrpt = window.document.createElement('script');\n "

         + "scrpt.setAttribute('src', url);\n "

         + "scrpt.setAttribute('id', jsonp);\n "

         + "scrpt.setAttribute('type', 'text/javascript');\n "

         + "var body = document.getElementsByTagName('body')[0];\n "

         + "body.appendChild(scrpt);\n"

     )

     private static void loadJSONP(String url, String jsonp) {

     }

     public static void extractJSON(Object jsonObject, String[] props, Object[] values) {

         for (int i = 0; i < props.length; i++) {

             values[i] = getProperty(jsonObject, props[i]);

         }

     }

 }