/**

 * 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.ko2brwsr;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

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;

/**

 *

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

 */

final class BrwsrCtxImpl implements Technology<Object>, Transfer, WSTransfer<LoadWS> {

    private BrwsrCtxImpl() {}

    public static final BrwsrCtxImpl DEFAULT = new BrwsrCtxImpl();

    @Override

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

        ConvertTypes.extractJSON(obj, props, values);

    }

    @Override

    public void loadJSON(final JSONCall call) {

        class R implements Runnable {

            final boolean success;

            public R(boolean success) {

                this.success = success;

            }

            Object[] arr = { null };

            @Override

            public void run() {

                if (success) {

                    call.notifySuccess(arr[0]);

                } else {

                    Throwable t;

                    if (arr[0] instanceof Throwable) {

                        t = (Throwable) arr[0];

                    } else {

                        if (arr[0] == null) {

                            t = new IOException();

                        } else {

                            t = new IOException(arr[0].toString());

                        }

                    }

                    call.notifyError(t);

                }

            }

        }

        R success = new R(true);

        R failure = new R(false);

        if (call.isJSONP()) {

            String me = ConvertTypes.createJSONP(success.arr, success);

            ConvertTypes.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);

                }

            }

            ConvertTypes.loadJSON(call.composeURL(null), success.arr, success, failure, call.getMethod(), data);

        }

    }

    @Override

    public Object wrapModel(Object model) {

        return model;

    }

    @Override

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

        Knockout.bind(data, b, b.getPropertyName(), 

            "getValue__Ljava_lang_Object_2", 

            b.isReadOnly() ? null : "setValue__VLjava_lang_Object_2", 

            false, false

        );

    }

    @Override

    public void valueHasMutated(Object data, String propertyName) {

        Knockout.valueHasMutated(data, propertyName);

    }

    @Override

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

        Knockout.expose(d, fb, fb.getFunctionName(), "call__VLjava_lang_Object_2Ljava_lang_Object_2");

    }

    @Override

    public void applyBindings(Object data) {

        Knockout.applyBindings(data);

    }

    @Override

    public Object wrapArray(Object[] arr) {

        return arr;

    }

    @Override

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

        return modelClass.cast(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 ConvertTypes.parse(sb.toString());

    }

    @Override

    public void runSafe(Runnable r) {

        r.run();

    }

    @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();

    }

}