/**

 * 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.launcher;

import java.io.File;

import java.io.IOException;

import java.io.InputStream;

import java.net.URL;

import java.util.jar.JarFile;

import org.apidesign.vm4brwsr.Bck2Brwsr;

/**

 * Lightweight server to launch Bck2Brwsr applications and tests.

 * Supports execution in native browser as well as Java's internal 

 * execution engine.

 */

final class Bck2BrwsrLauncher extends BaseHTTPLauncher {

    public Bck2BrwsrLauncher(String cmd) {

        super(cmd);

    }

    @Override

    String harnessResource() {

        return "org/apidesign/bck2brwsr/launcher/harness.xhtml";

    }

    @Override

    String compileJar(JarFile jar) throws IOException {

        return CompileCP.compileJAR(jar);

    }

    @Override String compileFromClassPath(URL f) {

        try {

            return CompileCP.compileFromClassPath(f);

        } catch (Exception ex) {

            ex.printStackTrace();

            return null;

        }

    }

    @Override

    void generateBck2BrwsrJS(StringBuilder sb, final Res loader) throws IOException {

        class R implements Bck2Brwsr.Resources {

            @Override

            public InputStream get(String resource) throws IOException {

                return loader.get(resource).openStream();

            }

        }

        Bck2Brwsr.generate(sb, new R());

        sb.append(

              "(function WrapperVM(global) {"

            + "  function ldCls(res) {\n"

            + "    var request = new XMLHttpRequest();\n"

            + "    request.open('GET', '/classes/' + res, false);\n"

            + "    request.send();\n"

            + "    if (request.status !== 200) return null;\n"

            + "    var arr = eval(request.responseText);\n"

            + "    return arr;\n"

            + "  }\n"

            + "  var prevvm = global.bck2brwsr;\n"

            + "  global.bck2brwsr = function() {\n"

            + "    var args = Array.prototype.slice.apply(arguments);\n"

            + "    args.unshift(ldCls);\n"

            + "    return prevvm.apply(null, args);\n"

            + "  };\n"

            + "  global.bck2brwsr.registerExtension = prevvm.registerExtension;\n"

            + "})(this);\n"

        );

    }

}