/**

 * HTML via Java(tm) Language Bindings

 * Copyright (C) 2013 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. apidesign.org

 * designates this particular file as subject to the

 * "Classpath" exception as provided by apidesign.org

 * in the License file that accompanied this code.

 *

 * 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://wiki.apidesign.org/wiki/GPLwithClassPathException

 */

package org.apidesign.html.kofx;

import java.io.Closeable;

import java.io.IOException;

import java.io.InputStream;

import java.util.ServiceLoader;

import java.util.logging.Logger;

import javafx.application.Platform;

import net.java.html.js.JavaScriptBody;

import netscape.javascript.JSObject;

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

import org.apidesign.html.context.spi.Contexts;

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;

import org.openide.util.lookup.ServiceProvider;

/** This is an implementation package - just

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

 * to access the functionality.

 * <p>

 * Registers {@link ContextProvider}, so {@link ServiceLoader} can find it.

 *

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

 */

public final class FXContext

implements Technology.BatchInit<JSObject>, 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 = "return true;")

    private static boolean isJavaScriptEnabledJs() {

        return false;

    }

    static boolean isJavaScriptEnabled() {

        if (javaScriptEnabled != null) {

            return javaScriptEnabled;

        }

        return javaScriptEnabled = isJavaScriptEnabledJs();

    }

    final boolean areWebSocketsSupported() {

        return LoadWS.isSupported();

    }

    @Override

    public JSObject 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();

        }

        return Knockout.wrapModel(model, 

            propNames, propReadOnly, Knockout.toArray(propValues), propArr, 

            funcNames, funcArr

        );

    }

    @Override

    public JSObject wrapModel(Object model) {

        throw new UnsupportedOperationException();

    }

    @Override

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

        throw new UnsupportedOperationException();

    }

    @Override

    public void valueHasMutated(JSObject data, String propertyName) {

        Knockout.valueHasMutated(data, propertyName);

    }

    @Override

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

        throw new UnsupportedOperationException();

    }

    @Override

    public void applyBindings(JSObject data) {

        Knockout.applyBindings(data);

    }

    @Override

    public Object wrapArray(Object[] arr) {

        return Knockout.toArray(arr);

    }

    @Override

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

        LoadJSON.extractJSON(obj, props, values);

    }

    @Override

    public void loadJSON(final JSONCall call) {

        LoadJSON.loadJSON(call);

    }

    @Override

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

        if (data instanceof JSObject) {

            data = ((JSObject)data).getMember("ko-fx.model"); // NOI18N

        }

        return modelClass.cast(data);

    }

    @Override

    public Object toJSON(InputStream is) throws IOException {

        return LoadJSON.parse(is);

    }

    @Override

    public void runSafe(final Runnable r) {

        class Wrap implements Runnable {

            @Override public void run() {

                try (Closeable c = Fn.activate(browserContext)) {

                    r.run();

                } catch (IOException ex) {

                    // cannot be thrown

                }

            }

        }

        Wrap w = new Wrap();

        if (Platform.isFxApplicationThread()) {

            w.run();

        } else {

            Platform.runLater(w);

        }

    }

    @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();

    }

    @ServiceProvider(service = Contexts.Provider.class)

    public static final class Prvdr implements Contexts.Provider {

        @Override

        public void fillContext(Contexts.Builder context, Class<?> requestor) {

            if (isJavaScriptEnabled()) {

                FXContext c = new FXContext(Fn.activePresenter());

                context.register(Technology.class, c, 100);

                context.register(Transfer.class, c, 100);

                if (c.areWebSocketsSupported()) {

                    context.register(WSTransfer.class, c, 100);

                }

            }

        }

    }

}