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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

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package org.netbeans.html.kofx;

import net.java.html.js.JavaScriptBody;

import net.java.html.js.JavaScriptResource;

import net.java.html.json.Model;

import netscape.javascript.JSObject;

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 <jtulach@netbeans.org>

 */

@JavaScriptResource("knockout-2.2.1.js")

final class Knockout {

    static final JSObject KObject;

    static {

        Console.register();

        KObject = (JSObject) kObj();

    }

    static Object toArray(Object[] arr) {

        return KObject.call("array", arr);

    }

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

          "if (model) {\n"

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

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

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

        + "  }\n"

        + "}\n"

    )

    public native static void valueHasMutated(JSObject model, String prop);

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

    native static void applyBindings(Object bindings);

    @JavaScriptBody(args = {}, body =

              "  var k = {};"

            + "  k.array= function() {"

            + "    return Array.prototype.slice.call(arguments);"

            + "  };"

            + "  return k;"

    )

    private static native Object kObj();

    @JavaScriptBody(

        javacall = true,

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

        body

        = "var ret = {};\n"

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

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

        + "  function realGetter() {\n"

        + "    try {"

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

        + "      return v;"

        + "    } catch (e) {"

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

        + "    }"

        + "  }\n"

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

        + "  var bnd = {"

        + "    read: function() {"

        + "      var r = activeGetter();"

        + "      activeGetter = realGetter;"

        + "      return r;"

        + "    },"

        + "    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"

        + "    };"

        + "  };"

        + "  ret[name] = ko.computed(bnd);"

        + "}\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"

        + "return ret;\n"

        )

    static native JSObject wrapModel(

        Object model,

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

        String[] funcNames, FunctionBinding[] funcArr

    );

}