/**

  * 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.io.IOException;

 import java.io.InputStream;

 import java.util.Set;

 import javax.script.Invocable;

 import javax.script.ScriptEngine;

 import javax.script.ScriptEngineManager;

 import javax.script.ScriptException;

 import org.apidesign.vm4brwsr.Bck2Brwsr;

 import org.testng.annotations.Test;

 import static org.testng.Assert.*;

 public class ProcessPageTest {

     @Test public void findsThreeIds() throws IOException {

         InputStream is = ProcessPageTest.class.getResourceAsStream("TestPage.html");

         assertNotNull(is, "Sample HTML page found");

         ProcessPage res = ProcessPage.readPage(is);

         final Set<String> ids = res.ids();

         assertEquals(ids.size(), 3, "Three ids found: " + ids);

         assertEquals(res.tagNameForId("pg.title"), "title");

         assertEquals(res.tagNameForId("pg.button"), "button");

         assertEquals(res.tagNameForId("pg.text"), "input");

     }

     @Test public void testCompileAndRunPageController() throws Exception {

         StringBuilder sb = new StringBuilder();

         sb.append(

               "var window = new Object();\n"

             + "var doc = new Object();\n"

             + "doc.button = new Object();\n"

             + "doc.title = new Object();\n"

             + "doc.title.innerHTML = 'nothing';\n"

             + "doc.text = new Object();\n"

             + "doc.text.value = 'something';\n"

             + "doc.getElementById = function(id) {\n"

             + "    switch(id) {\n"

             + "      case 'pg.button': return doc.button;\n"

             + "      case 'pg.title': return doc.title;\n"

             + "      case 'pg.text': return doc.text;\n"

             + "    }\n"

             + "    throw id;\n"

             + "  }\n"

             + "\n"

             + "function clickAndCheck() {\n"

             + "  doc.button.onclick();\n"

             + "  return doc.title.innerHTML.toString();\n"

             + "};\n"

             + "\n"

             + "window.document = doc;\n"

         );

         Invocable i = compileClass(sb, "org/apidesign/bck2brwsr/htmlpage/PageController");

         Object ret = null;

         try {

             ret = i.invokeFunction("clickAndCheck");

         } catch (ScriptException ex) {

             fail("Execution failed in " + sb, ex);

         } catch (NoSuchMethodException ex) {

             fail("Cannot find method in " + sb, ex);

         }

         assertEquals(ret, "You want this window to be named something", "We expect that the JavaCode performs all the wiring");

     }

     @Test public void clickWithArgumentCalled() throws Exception {

         StringBuilder sb = new StringBuilder();

         sb.append(

               "var window = new Object();\n"

             + "var doc = new Object();\n"

             + "doc.button = new Object();\n"

             + "doc.title = new Object();\n"

             + "doc.title.innerHTML = 'nothing';\n"

             + "doc.text = new Object();\n"

             + "doc.text.value = 'something';\n"

             + "doc.getElementById = function(id) {\n"

             + "    switch(id) {\n"

             + "      case 'pg.button': return doc.button;\n"

             + "      case 'pg.title': return doc.title;\n"

             + "      case 'pg.text': return doc.text;\n"

             + "    }\n"

             + "    throw id;\n"

             + "  }\n"

             + "\n"

             + "function clickAndCheck() {\n"

             + "  doc.title.onclick();\n"

             + "  return doc.title.innerHTML.toString();\n"

             + "};\n"

             + "\n"

             + "window.document = doc;\n"

         );

         Invocable i = compileClass(sb, 

             "org/apidesign/bck2brwsr/htmlpage/PageController"

         );

         Object ret = null;

         try {

             ret = i.invokeFunction("clickAndCheck");

         } catch (ScriptException ex) {

             fail("Execution failed in " + sb, ex);

         } catch (NoSuchMethodException ex) {

             fail("Cannot find method in " + sb, ex);

         }

         assertEquals(ret, "pg.title", "Title has been passed to the method argument");

     }

     static Invocable compileClass(StringBuilder sb, String... names) throws ScriptException, IOException {

         if (sb == null) {

             sb = new StringBuilder();

         }

         Bck2Brwsr.generate(sb, ProcessPageTest.class.getClassLoader(), names);

         ScriptEngineManager sem = new ScriptEngineManager();

         ScriptEngine js = sem.getEngineByExtension("js");

         try {

             Object res = js.eval(sb.toString());

             assertTrue(js instanceof Invocable, "It is invocable object: " + res);

             return (Invocable) js;

         } catch (ScriptException ex) {

             fail("Could not compile:\n" + sb, ex);

             return null;

         }

     }

 }