/**

 * 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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 * Contributor(s):

 *

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

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

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 * 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

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

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 */

package org.netbeans.html.ko4j;

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

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

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

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

import static org.netbeans.html.ko4j.KO4J.LOG;

/** 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

 */

@Contexts.Id("ko4j")

final class KOTech

implements Technology.BatchInit<Object>, Technology.ValueMutated<Object> {

    private Object[] jsObjects;

    private int jsIndex;

    public KOTech() {

    }

    @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 = getJSObject();

        Knockout.wrapModel(new Knockout(model, ret, propArr, funcArr),

            ret, 

            propNames, propReadOnly, propValues,

            funcNames

        );

        return ret;

    }

    private Object getJSObject() {

        int len = 64;

        if (jsObjects != null && jsIndex < (len = jsObjects.length)) {

            Object ret = jsObjects[jsIndex];

            jsObjects[jsIndex] = null;

            jsIndex++;

            return ret;

        }

        jsObjects = Knockout.allocJS(len * 2);

        jsIndex = 1;

        Object ret = jsObjects[0];

        jsObjects[0] = null;

        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.cleanUp();

        Knockout.valueHasMutated(data, propertyName, null, null);

    }

    @Override

    public void valueHasMutated(Object data, String propertyName, Object oldValue, Object newValue) {

        Knockout.cleanUp();

        Knockout.valueHasMutated(data, propertyName, oldValue, newValue);

    }

    @Override

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

        throw new UnsupportedOperationException();

    }

    @Override

    public void applyBindings(Object data) {

        Object ko = Knockout.applyBindings(data);

        if (ko instanceof Knockout) {

            ((Knockout)ko).hold();

        }

    }

    @Override

    public Object wrapArray(Object[] arr) {

        return arr;

    }

    @Override

    public void runSafe(final Runnable r) {

        LOG.warning("Technology.runSafe has been deprecated. Use BrwsrCtx.execute!");

        r.run();

    }    

    @Override

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

        return modelClass.cast(Knockout.toModel(data));

    }

}