/**

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

  *

  * Copyright 2013-2014 Oracle and/or its affiliates. All rights reserved.

  *

  * Oracle and Java are registered trademarks of Oracle and/or its affiliates.

  * Other names may be trademarks of their respective owners.

  *

  * The contents of this file are subject to the terms of either the GNU

  * General Public License Version 2 only ("GPL") or the Common

  * Development and Distribution License("CDDL") (collectively, the

  * "License"). You may not use this file except in compliance with the

  * License. You can obtain a copy of the License at

  * http://www.netbeans.org/cddl-gplv2.html

  * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the

  * specific language governing permissions and limitations under the

  * License.  When distributing the software, include this License Header

  * Notice in each file and include the License file at

  * nbbuild/licenses/CDDL-GPL-2-CP.  Oracle designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Oracle in the GPL Version 2 section of the License file that

  * accompanied this code. If applicable, add the following below the

  * License Header, with the fields enclosed by brackets [] replaced by

  * your own identifying information:

  * "Portions Copyrighted [year] [name of copyright owner]"

  *

  * Contributor(s):

  *

  * The Original Software is NetBeans. The Initial Developer of the Original

  * Software is Oracle. Portions Copyright 2013-2014 Oracle. All Rights Reserved.

  *

  * If you wish your version of this file to be governed by only the CDDL

  * or only the GPL Version 2, indicate your decision by adding

  * "[Contributor] elects to include this software in this distribution

  * under the [CDDL or GPL Version 2] license." If you do not indicate a

  * single choice of license, a recipient has the option to distribute

  * your version of this file under either the CDDL, the GPL Version 2 or

  * to extend the choice of license to its licensees as provided above.

  * However, if you add GPL Version 2 code and therefore, elected the GPL

  * Version 2 license, then the option applies only if the new code is

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 package org.netbeans.html.ko4j;

 import java.io.ByteArrayOutputStream;

 import java.io.IOException;

 import java.io.InputStream;

 import java.io.InputStreamReader;

 import net.java.html.js.JavaScriptBody;

 import org.apidesign.html.json.spi.JSONCall;

 import org.apidesign.html.json.spi.Transfer;

 import org.apidesign.html.json.spi.WSTransfer;

 /**

  *

  * @author Jaroslav Tulach

  */

 final class LoadJSON implements Transfer, WSTransfer<LoadWS> {

     private LoadJSON() {}

     @Override

     public void extract(Object obj, String[] props, Object[] values) {

         extractJSON(obj, props, values);

     }

     @Override

     public void loadJSON(final JSONCall call) {

         if (call.isJSONP()) {

             String me = createJSONP(call);

             loadJSONP(call.composeURL(me), me);

         } else {

             String data = null;

             if (call.isDoOutput()) {

                 try {

                     ByteArrayOutputStream bos = new ByteArrayOutputStream();

                     call.writeData(bos);

                     data = new String(bos.toByteArray(), "UTF-8");

                 } catch (IOException ex) {

                     call.notifyError(ex);

                 }

             }

             loadJSON(call.composeURL(null), call, call.getMethod(), data);

         }

     }

     @Override

     public Object toJSON(InputStream is) throws IOException {

         StringBuilder sb = new StringBuilder();

         InputStreamReader r = new InputStreamReader(is);

         for (;;) {

             int ch = r.read();

             if (ch == -1) {

                 break;

             }

             sb.append((char)ch);

         }

         return parse(sb.toString());

     }

     @Override

     public LoadWS open(String url, JSONCall callback) {

         return new LoadWS(callback, url);

     }

     @Override

     public void send(LoadWS socket, JSONCall data) {

         socket.send(data);

     }

     @Override

     public void close(LoadWS socket) {

         socket.close();

     }

     //

     // implementations

     //

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

         body

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

         + "if (object === null) return null;\n"

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

     )

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

         return null;

     }

     static String createJSONP(JSONCall whenDone) {

         int h = whenDone.hashCode();

         String name;

         for (;;) {

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

             if (defineIfUnused(name, whenDone)) {

                 return name;

             }

             h++;

         }

     }

     @JavaScriptBody(args = {"name", "done"}, javacall = true, 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"

         + "  done.@org.apidesign.html.json.spi.JSONCall::notifySuccess(Ljava/lang/Object;)(data);\n"

         + "};\n"

         + "return true;\n"

     )

     private static boolean defineIfUnused(String name, JSONCall done) {

         return true;

     }

     @JavaScriptBody(args = {"s"}, body = "return eval('(' + s + ')');")

     static Object parse(String s) {

         return s;

     }

     @JavaScriptBody(args = {"url", "done", "method", "data"}, javacall = true, body = ""

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

         + "if (!method) method = 'GET';\n"

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

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

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

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

         + "  var r = request.response || request.responseText;\n"

         + "  try {\n"

         + "    if (request.status < 100 || request.status >= 400) throw request.status + ': ' + request.statusText;"

         + "    try { r = eval('(' + r + ')'); } catch (ignore) { }"

         + "    done.@org.apidesign.html.json.spi.JSONCall::notifySuccess(Ljava/lang/Object;)(r);\n"

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

         + "    @org.netbeans.html.ko4j.LoadJSON::notifyError(Ljava/lang/Object;Ljava/lang/Object;)(done, error);\n"

         + "  }\n"

         + "};\n"

         + "request.onerror = function (e) {\n"

         + "  console.log('error loading :' + url + ' props: ' + Object.getOwnPropertyNames(e));\n"

         + "  @org.netbeans.html.ko4j.LoadJSON::notifyError(Ljava/lang/Object;Ljava/lang/Object;)(done, e);\n"

         + "}\n"

         + "if (data) request.send(data);"

         + "else request.send();"

     )

     static void loadJSON(

         String url, JSONCall done, String method, String data

     ) {

     }

     static void notifyError(Object done, Object msg) {

         ((JSONCall)done).notifyError(new Exception(msg.toString()));

     }

     @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"

     )

     static void loadJSONP(String url, String jsonp) {

     }

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

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

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

         }

     }

 }