/**

 * 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.lang.reflect.Method;

import java.util.Set;

import javax.script.Invocable;

import javax.script.ScriptEngine;

import javax.script.ScriptEngineManager;

import javax.script.ScriptException;

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");

    }

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

        if (sb == null) {

            sb = new StringBuilder();

        }

        try {

            Method m;

            Class<?> genJS = Class.forName("org.apidesign.vm4brwsr.GenJS");

            m = genJS.getDeclaredMethod("compile", Appendable.class, String[].class);

            m.setAccessible(true);

            m.invoke(null, sb, names);

        } catch (Exception exception) {

            throw new IOException(exception);

        }

        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;

        }

    }

}