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

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package org.netbeans.html.ko4j;

import net.java.html.js.JavaScriptBody;

import net.java.html.js.JavaScriptResource;

import net.java.html.json.Model;

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

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

/** This is an implementation package - just

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

 * to access the functionality.

 * <p>

 * Provides binding between {@link Model models} and knockout.js running

 * inside a JavaFX WebView. 

 *

 * @author Jaroslav Tulach

 */

@JavaScriptResource("knockout-2.2.1.js")

final class Knockout {

    @JavaScriptBody(args = { "model", "prop", "oldValue", "newValue" }, 

        wait4js = false,

        body =

          "if (model) {\n"

        + "  var koProp = model[prop];\n"

        + "  if (koProp && koProp['valueHasMutated']) {\n"

        + "    if ((oldValue !== null || newValue !== null)) {\n"

        + "      koProp['valueHasMutated'](newValue);\n"

        + "    } else if (koProp['valueHasMutated']) {\n"

        + "      koProp['valueHasMutated']();\n"

        + "    }\n"

        + "  }\n"

        + "}\n"

    )

    public native static void valueHasMutated(

        Object model, String prop, Object oldValue, Object newValue

    );

    @JavaScriptBody(args = { "bindings" }, wait4js = false, body = 

        "ko.applyBindings(bindings);\n"

    )

    native static void applyBindings(Object bindings);

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

        "var arr = new Array(cnt);\n" +

        "for (var i = 0; i < cnt; i++) arr[i] = new Object();\n" +

        "return arr;\n"

    )

    native static Object[] allocJS(int cnt);

    @JavaScriptBody(

        javacall = true,

        wait4js = false,

        args = {"ret", "model", "propNames", "propReadOnly", "propValues", "propArr", "funcNames", "funcArr"},

        body = 

          "ret['ko-fx.model'] = model;\n"

        + "function koComputed(name, readOnly, value, prop) {\n"

        + "  function realGetter() {\n"

        + "    try {\n"

        + "      var v = prop.@org.apidesign.html.json.spi.PropertyBinding::getValue()();\n"

        + "      return v;\n"

        + "    } catch (e) {\n"

        + "      alert(\"Cannot call getValue on \" + model + \" prop: \" + name + \" error: \" + e);\n"

        + "    }\n"

        + "  }\n"

        + "  var activeGetter = function() { return value; };\n"

        + "  var bnd = {\n"

        + "    'read': function() {\n"

        + "      var r = activeGetter();\n"

        + "      activeGetter = realGetter;\n"

        + "      if (r) try { var br = r.valueOf(); } catch (err) {}\n"

        + "      return br === undefined ? r: br;\n"

        + "    },\n"

        + "    'owner': ret\n"

        + "  };\n"

        + "  if (!readOnly) {\n"

        + "    bnd['write'] = function(val) {\n"

        + "      prop.@org.apidesign.html.json.spi.PropertyBinding::setValue(Ljava/lang/Object;)(val);\n"

        + "    };\n"

        + "  };\n"

        + "  var cmpt = ko['computed'](bnd);\n"

        + "  var vhm = cmpt['valueHasMutated'];\n"

        + "  cmpt['valueHasMutated'] = function(val) {\n"

        + "    if (arguments.length === 1) activeGetter = function() { return val; };\n"

        + "    vhm();\n"

        + "  };\n"

        + "  ret[name] = cmpt;\n"

        + "}\n"

        + "for (var i = 0; i < propNames.length; i++) {\n"

        + "  koComputed(propNames[i], propReadOnly[i], propValues[i], propArr[i]);\n"

        + "}\n"

        + "function koExpose(name, func) {\n"

        + "  ret[name] = function(data, ev) {\n"

        + "    func.@org.apidesign.html.json.spi.FunctionBinding::call(Ljava/lang/Object;Ljava/lang/Object;)(data, ev);\n"

        + "  };\n"

        + "}\n"

        + "for (var i = 0; i < funcNames.length; i++) {\n"

        + "  koExpose(funcNames[i], funcArr[i]);\n"

        + "}\n"

        )

    static native void wrapModel(

        Object ret, Object model,

        String[] propNames, boolean[] propReadOnly, Object propValues, PropertyBinding[] propArr,

        String[] funcNames, FunctionBinding[] funcArr

    );

    @JavaScriptBody(args = { "o" }, body = "return o['ko-fx.model'] ? o['ko-fx.model'] : o;")

    private static native Object toModelImpl(Object wrapper);

    static Object toModel(Object wrapper) {

        return toModelImpl(wrapper);

    }

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

    static final boolean areWebSocketsSupported() {

        return false;

    }

}