/**

  * 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.html.ko2brwsr;

 import java.lang.reflect.Method;

 import java.util.List;

 import org.apidesign.bck2brwsr.core.ExtraJavaScript;

 import org.apidesign.bck2brwsr.core.JavaScriptBody;

 /** Provides binding between models and bck2brwsr VM.

  *

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

  */

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

 final class Knockout {

     /** used by tests */

     static Knockout next;

     private final Object model;

     Knockout(Object model) {

         this.model = model == null ? this : model;

     }

     public static <M> Knockout applyBindings(

         Object model, String[] propsGettersAndSetters,

         String[] methodsAndSignatures

     ) {

         applyImpl(propsGettersAndSetters, model.getClass(), model, model, methodsAndSignatures);

         return new Knockout(model);

     }

     public static <M> Knockout applyBindings(

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

         String[] methodsAndSignatures

     ) {

         Knockout bindings = next;

         next = null;

         if (bindings == null) {

             bindings = new Knockout(null);

         }

         applyImpl(propsGettersAndSetters, modelClass, bindings, model, methodsAndSignatures);

         applyBindings(bindings);

         return bindings;

     }

     public void valueHasMutated(String prop) {

         valueHasMutated(model, prop);

     }

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

         "var p = self[prop]; if (p) p.valueHasMutated();"

     )

     public static void valueHasMutated(Object self, String prop) {

     }

     @JavaScriptBody(args = { "id", "ev" }, body = "ko.utils.triggerEvent(window.document.getElementById(id), ev.substring(2));")

     public static void triggerEvent(String id, String ev) {

     }

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

           "var bnd = {\n"

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

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

         + "    if (array) v = v.koArray(); else if (v !== null) v = v.valueOf();\n"

         + "    return v;\n"

         + "  },\n"

         + "  'owner': bindings\n"

         + "};\n"

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

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

         + "    var v = val === null ? null : val.valueOf();"

         + "    model[setter](v);\n"

         + "  };\n"

         + "}\n"

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

     )

     static void bind(

         Object bindings, Object model, String prop, String getter, String setter, boolean primitive, boolean array

     ) {

     }

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

         "bindings[prop] = function(data, ev) { model[sig](data, ev); };"

     )

     static void expose(

         Object bindings, Object model, String prop, String sig

     ) {

     }

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

     static void applyBindings(Object bindings) {}

     private static void applyImpl(

         String[] propsGettersAndSetters,

         Class<?> modelClass,

         Object bindings,

         Object model,

         String[] methodsAndSignatures

     ) throws IllegalStateException, SecurityException {

         for (int i = 0; i < propsGettersAndSetters.length; i += 4) {

             try {

                 Method getter = modelClass.getMethod(propsGettersAndSetters[i + 3]);

                 bind(bindings, model, propsGettersAndSetters[i],

                     propsGettersAndSetters[i + 1],

                     propsGettersAndSetters[i + 2],

                     getter.getReturnType().isPrimitive(),

                     List.class.isAssignableFrom(getter.getReturnType()));

             } catch (NoSuchMethodException ex) {

                 throw new IllegalStateException(ex.getMessage());

             }

         }

         for (int i = 0; i < methodsAndSignatures.length; i += 2) {

             expose(

                 bindings, model, methodsAndSignatures[i], methodsAndSignatures[i + 1]);

         }

     }

 }