/**

 * 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 java.util.List;

import javafx.scene.web.WebEngine;

import netscape.javascript.JSObject;

import org.apidesign.bck2brwsr.core.JavaScriptBody;

import org.apidesign.bck2brwsr.htmlpage.api.ComputedProperty;

import org.apidesign.bck2brwsr.htmlpage.api.OnEvent;

import org.apidesign.bck2brwsr.htmlpage.api.OnFunction;

import org.apidesign.bck2brwsr.htmlpage.api.Page;

import org.apidesign.bck2brwsr.htmlpage.api.Property;

import org.apidesign.bck2brwsr.vmtest.BrwsrTest;

import org.apidesign.bck2brwsr.vmtest.HtmlFragment;

import org.apidesign.bck2brwsr.vmtest.VMTest;

import static org.testng.Assert.assertEquals;

import org.testng.annotations.Factory;

import org.testng.annotations.Test;

/**

 *

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

 */

@Page(xhtml="Knockout.xhtml", className="KnockoutModel", properties={

    @Property(name="name", type=String.class),

    @Property(name="results", type=String.class, array = true),

    @Property(name="callbackCount", type=int.class),

    @Property(name="people", type=Person.class, array = true)

}) 

public class KnockoutTest {

    @HtmlFragment(

        "<h1 data-bind=\"text: helloMessage\">Loading Bck2Brwsr's Hello World...</h1>\n" +

        "Your name: <input id='input' data-bind=\"value: name\"></input>\n" +

        "<button id=\"hello\">Say Hello!</button>\n"

    )

    @BrwsrTest public void modifyValueAssertChangeInModel() {

        KnockoutModel m = new KnockoutModel();

        m.setName("Kukuc");

        m.applyBindings();

        assert "Kukuc".equals(m.input.getValue()) : "Value is really kukuc: " + m.input.getValue();

        m.input.setValue("Jardo");

        m.triggerEvent(m.input, OnEvent.CHANGE);

        assert "Jardo".equals(m.getName()) : "Name property updated: " + m.getName();

    }

    @HtmlFragment(

        "<ul id='ul' data-bind='foreach: results'>\n"

        + "  <li data-bind='text: $data, click: $root.call'/>\n"

        + "</ul>\n"

    )

    @BrwsrTest public void displayContentOfArray() {

        KnockoutModel m = new KnockoutModel();

        m.getResults().add("Ahoj");

        m.applyBindings();

        int cnt = countChildren("ul");

        assert cnt == 1 : "One child, but was " + cnt;

        m.getResults().add("Hi");

        cnt = countChildren("ul");

        assert cnt == 2 : "Two children now, but was " + cnt;

        triggerChildClick("ul", 1);

        assert 1 == m.getCallbackCount() : "One callback " + m.getCallbackCount();

        assert "Hi".equals(m.getName()) : "We got callback from 2nd child " + m.getName();

    }

    @HtmlFragment(

        "<ul id='ul' data-bind='foreach: cmpResults'>\n"

        + "  <li><b data-bind='text: $data'></b></li>\n"

        + "</ul>\n"

    )

    @BrwsrTest public void displayContentOfDerivedArray() {

        KnockoutModel m = new KnockoutModel();

        m.getResults().add("Ahoj");

        m.applyBindings();

        int cnt = countChildren("ul");

        assert cnt == 1 : "One child, but was " + cnt;

        m.getResults().add("hello");

        cnt = countChildren("ul");

        assert cnt == 2 : "Two children now, but was " + cnt;

    }

    @HtmlFragment(

        "<ul id='ul' data-bind='foreach: people'>\n"

        + "  <li data-bind='text: $data.firstName, click: $root.removePerson'></li>\n"

        + "</ul>\n"

    )

    @BrwsrTest public void displayContentOfArrayOfPeople() {

        KnockoutModel m = new KnockoutModel();

        final Person first = new Person();

        first.setFirstName("first");

        m.getPeople().add(first);

        m.applyBindings();

        int cnt = countChildren("ul");

        assert cnt == 1 : "One child, but was " + cnt;

        final Person second = new Person();

        second.setFirstName("second");

        m.getPeople().add(second);

        cnt = countChildren("ul");

        assert cnt == 2 : "Two children now, but was " + cnt;

        triggerChildClick("ul", 1);

        assert 1 == m.getCallbackCount() : "One callback " + m.getCallbackCount();

        cnt = countChildren("ul");

        assert cnt == 1 : "Again one child, but was " + cnt;

        String txt = childText("ul", 0);

        assert "first".equals(txt) : "Expecting 'first': " + txt;

        first.setFirstName("changed");

        txt = childText("ul", 0);

        assert "changed".equals(txt) : "Expecting 'changed': " + txt;

    }

    @ComputedProperty

    static Person firstPerson(List<Person> people) {

        return people.isEmpty() ? null : people.get(0);

    }

    @HtmlFragment(

        "<p id='ul' data-bind='with: firstPerson'>\n"

        + "  <span data-bind='text: firstName, click: changeSex'></span>\n"

        + "</p>\n"

    )

    @BrwsrTest public void accessFirstPersonWithOnFunction() {

        trasfertToFemale();

    }

    @HtmlFragment(

        "<ul id='ul' data-bind='foreach: people'>\n"

        + "  <li data-bind='text: $data.firstName, click: changeSex'></li>\n"

        + "</ul>\n"

    )

    @BrwsrTest public void onPersonFunction() {

        trasfertToFemale();

    }

    private void trasfertToFemale() {

        KnockoutModel m = new KnockoutModel();

        final Person first = new Person();

        first.setFirstName("first");

        first.setSex(Sex.MALE);

        m.getPeople().add(first);

        m.applyBindings();

        int cnt = countChildren("ul");

        assert cnt == 1 : "One child, but was " + cnt;

        triggerChildClick("ul", 0);

        assert first.getSex() == Sex.FEMALE : "Transverted to female: " + first.getSex();

    }

    @Test public void cloneModel() {

        Person model = new Person();

        model.setFirstName("first");

        Person snd = model.clone();

        snd.setFirstName("clone");

        assertEquals("first", model.getFirstName(), "Value has not changed");

        assertEquals("clone", snd.getFirstName(), "Value has changed in clone");

    }

    @Test public void deepCopyOnClone() {

        People model = new People();

        model.getNicknames().add("Jarda");

        assertEquals(model.getNicknames().size(), 1, "One element");

        People snd = model.clone();

        snd.getNicknames().clear();

        assertEquals(snd.getNicknames().size(), 0, "Clone is empty");

        assertEquals(model.getNicknames().size(), 1, "Still one element");

    }

    @OnFunction

    static void call(KnockoutModel m, String data) {

        m.setName(data);

        m.setCallbackCount(m.getCallbackCount() + 1);

    }

    @OnFunction

    static void removePerson(KnockoutModel model, Person data) {

        model.setCallbackCount(model.getCallbackCount() + 1);

        model.getPeople().remove(data);

    }

    @ComputedProperty

    static String helloMessage(String name) {

        return "Hello " + name + "!";

    }

    @ComputedProperty

    static List<String> cmpResults(List<String> results) {

        return results;

    }

    @Factory

    public static Object[] create() {

        return VMTest.create(KnockoutTest.class);

    }

    private static final String COUNT_CHILDREN = 

          "var e = window.document.getElementById(id);\n "

        + "if (typeof e === 'undefined') return -2;\n "

        + "return e.children.length;\n";

    @JavaScriptBody(args = { "id" }, body = COUNT_CHILDREN)

    private static int countChildren(String id) {

        return ((Number)js().call("countChildren", id)).intValue();

    }

    private static final String TRIGGER_CHILD_CLICK = 

          "var e = window.document.getElementById(id);\n "

        + "var ev = window.document.createEvent('MouseEvents');\n "

        + "ev.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);\n "

        + "e.children[pos].dispatchEvent(ev);\n ";

    @JavaScriptBody(args = { "id", "pos" }, body = TRIGGER_CHILD_CLICK)

    private static void triggerChildClick(String id, int pos) {

        js().call("triggerChildClick", id, pos);

    }

    private static final String CHILD_TEXT = 

          "var e = window.document.getElementById(id);\n "

        + "var t = e.children[pos].innerHTML;\n "

        + "return t ? t : null;";

    @JavaScriptBody(args = { "id", "pos" }, body = CHILD_TEXT)

    private static String childText(String id, int pos) {

        return (String) js().call("childText", id, pos);

    }

    private static JSObject js;

    private static JSObject js() {

        if (js == null) {

            WebEngine eng = (WebEngine)System.getProperties().get("webEngine");

            if (eng == null) {

                js = null;

            } else {

                js = (JSObject) eng.executeScript("(function () {" +

                    "var obj = {};"

                    + ""

                    + "obj.countChildren = function(id) { " + COUNT_CHILDREN + "};"

                    + "obj.triggerChildClick = function(id, pos) { " + TRIGGER_CHILD_CLICK + "};"

                    + "obj.childText = function(id, pos) { " + CHILD_TEXT + "};"

                    + "return obj;"

                + "})();");

            }

        }

        return js;

    }

}