/**

 * 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

 * made subject to such option by the copyright holder.

 */

package org.netbeans.html.ko4j;

import java.io.ByteArrayOutputStream;

import java.io.Closeable;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.Reader;

import java.net.URL;

import java.util.concurrent.Executor;

import java.util.logging.Logger;

import net.java.html.js.JavaScriptBody;

import org.apidesign.html.boot.spi.Fn;

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

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

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

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

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

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

/** This is an implementation package - just

 * include its JAR on classpath and use official {@link Context} API

 * to access the functionality.

 * <p>

 *

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

 */

final class FXContext

implements Technology.BatchInit<Object>, Transfer, WSTransfer<LoadWS> {

    static final Logger LOG = Logger.getLogger(FXContext.class.getName());

    private static Boolean javaScriptEnabled;

    private final Fn.Presenter browserContext;

    public FXContext(Fn.Presenter browserContext) {

        this.browserContext = browserContext;

    }

    @JavaScriptBody(args = {}, body = "if (window) return true; else return false;")

    private static boolean isJavaScriptEnabledJs() {

        return false;

    }

    static boolean isJavaScriptEnabled() {

        if (javaScriptEnabled != null) {

            return javaScriptEnabled;

        }

        if (!(javaScriptEnabled = isJavaScriptEnabledJs())) {

            Closeable c = Fn.activate(new TrueFn());

            try {

                javaScriptEnabled = isJavaScriptEnabledJs();

            } finally {

                try {

                    c.close();

                } catch (IOException ex) {

                    // cannot happen

                }

            }

        }

        return javaScriptEnabled;

    }

    final boolean areWebSocketsSupported() {

        return isWebSocket();

    }

    @JavaScriptBody(args = {}, body = "if (window.WebSocket) return true; else return false;")

    private static boolean isWebSocket() {

        return false;

    }

    @Override

    public Object wrapModel(Object model, PropertyBinding[] propArr, FunctionBinding[] funcArr) {

        String[] propNames = new String[propArr.length];

        boolean[] propReadOnly = new boolean[propArr.length];

        Object[] propValues = new Object[propArr.length];

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

            propNames[i] = propArr[i].getPropertyName();

            propReadOnly[i] = propArr[i].isReadOnly();

            propValues[i] = propArr[i].getValue();

        }

        String[] funcNames = new String[funcArr.length];

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

            funcNames[i] = funcArr[i].getFunctionName();

        }

        Object ret = Knockout.wrapModel(model, 

            propNames, propReadOnly, propValues, propArr,

            funcNames, funcArr

        );

        return ret;

    }

    @Override

    public Object wrapModel(Object model) {

        throw new UnsupportedOperationException();

    }

    @Override

    public void bind(PropertyBinding b, Object model, Object data) {

        throw new UnsupportedOperationException();

    }

    @Override

    public void valueHasMutated(Object data, String propertyName) {

        Knockout.valueHasMutated(data, propertyName);

    }

    @Override

    public void expose(FunctionBinding fb, Object model, Object d) {

        throw new UnsupportedOperationException();

    }

    @Override

    public void applyBindings(Object data) {

        Knockout.applyBindings(data);

    }

    @Override

    public Object wrapArray(Object[] arr) {

        return arr;

    }

    @Override

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

        LoadJSON.extractJSON(obj, props, values);

    }

    @Override

    public void loadJSON(final JSONCall call) {

        if (call.isJSONP()) {

            String me = LoadJSON.createJSONP(call);

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

        }

    }

    @Override

    public <M> M toModel(Class<M> modelClass, Object data) {

        return modelClass.cast(Knockout.toModel(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 LoadJSON.parse(sb.toString());

    }

    @Override

    public void runSafe(final Runnable r) {

        class Wrap implements Runnable {

            @Override public void run() {

                Closeable c = Fn.activate(browserContext);

                try {

                    r.run();

                } finally {

                    try {

                        c.close();

                    } catch (IOException ex) {

                        // cannot be thrown

                    }

                }

            }

        }

        Wrap w = new Wrap();

        if (browserContext instanceof Executor) {

            ((Executor)browserContext).execute(w);

        } else {

            w.run();

        }

    }

    @Override

    public LoadWS open(String url, JSONCall onReply) {

        return new LoadWS(onReply, url);

    }

    @Override

    public void send(LoadWS socket, JSONCall data) {

        socket.send(data);

    }

    @Override

    public void close(LoadWS socket) {

        socket.close();

    }

    private static final class TrueFn extends Fn implements Fn.Presenter {

        @Override

        public Object invoke(Object thiz, Object... args) throws Exception {

            return true;

        }

        @Override

        public Fn defineFn(String code, String... names) {

            return this;

        }

        @Override

        public void displayPage(URL page, Runnable onPageLoad) {

        }

        @Override

        public void loadScript(Reader code) throws Exception {

        }

    } // end of TrueFn

}