/**

 * 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

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 * 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

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 * "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

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

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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.netbeans.html.json.spi.JSONCall;

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

import org.netbeans.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.netbeans.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.netbeans.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]);

        }

    }

}