/**

 * 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.htmlpage;

import org.apidesign.bck2brwsr.core.ExtraJavaScript;

import org.apidesign.bck2brwsr.core.JavaScriptBody;

/** Provides binding between models and 

 *

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

 */

@ExtraJavaScript(resource = "/org/apidesign/bck2brwsr/htmlpage/knockout-2.2.1.js")

public class Knockout {

    /** used by tests */

    static Knockout next;

    Knockout() {

    }

    public static <M> Knockout applyBindings(

        Class<M> modelClass, M model, String[] propsGettersAndSetters

    ) {

        Knockout bindings = next;

        next = null;

        if (bindings == null) {

            bindings = new Knockout();

        }

        for (int i = 0; i < propsGettersAndSetters.length; i += 3) {

            bind(bindings, model, propsGettersAndSetters[i],

                propsGettersAndSetters[i + 1],

                propsGettersAndSetters[i + 2]

            );

        }

        applyBindings(bindings);

        return bindings;

    }

    @JavaScriptBody(args = { "prop" }, body =

        "this[prop].valueHasMutated();"

    )

    public void valueHasMutated(String prop) {

    }

    @JavaScriptBody(args = { "bindings", "model", "prop", "getter", "setter" }, body =

          "var bnd = {\n"

        + "  read: function() {\n"

        + "    var v = model[getter]();\n"

        + "    return v;\n"

        + "  },\n"

        + "  owner: bindings\n"

        + "};\n"

        + "if (setter != null) {\n"

        + "  bnd.write = function(val) {\n"

        + "    model[setter](new Number(val));\n"

        + "  };\n"

        + "}\n"

        + "bindings[prop] = ko.computed(bnd);"

    )

    private static void bind(

        Object bindings, Object model, String prop, String getter, String setter

    ) {

    }

    @JavaScriptBody(args = { "bindings" }, body = "ko.applyBindings(bindings);")

    private static void applyBindings(Object bindings) {}

}