/**

 * Back 2 Browser Bytecode Translator

 * Copyright (C) 2012-2015 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.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;

import java.io.StringWriter;

import java.net.JarURLConnection;

import java.net.URISyntaxException;

import java.net.URL;

import java.net.URLConnection;

import java.util.Set;

import java.util.logging.Logger;

import org.apidesign.bck2brwsr.aot.Bck2BrwsrJars;

import org.apidesign.bck2brwsr.launcher.BaseHTTPLauncher.Res;

import org.apidesign.vm4brwsr.Bck2Brwsr;

/**

 *

 * @author Jaroslav Tulach

 */

class CompileCP {

    private static final Logger LOG = Logger.getLogger(CompileCP.class.getName());

    static String compileJAR(final File jar, Set<String> testClasses) 

    throws IOException {

        StringWriter w = new StringWriter();

        try {

            Bck2BrwsrJars.configureFrom(null, jar)

                .addExported(testClasses.toArray(new String[0]))

                .generate(w);

            w.flush();

            return w.toString();

        } catch (IOException ex) {

            throw ex;

        } catch (Throwable ex) {

            throw new IOException("Cannot compile: ", ex);

        } finally {

            w.close();

        }

    }

    static String compileFromClassPath(URL u, final Res r) throws IOException {

        File f;

        try {

            f = new File(u.toURI());

        } catch (URISyntaxException ex) {

            throw new IOException(ex);

        }

        String s = f.isDirectory() ? f.getPath() : null;

        for (String candidate : System.getProperty("java.class.path").split(File.pathSeparator)) {

            if (s != null) {

                break;

            }

            if (f.getPath().startsWith(candidate)) {

                s = candidate;

            }

        }

        if (s != null) {

            File root = new File(s);

            StringWriter w = new StringWriter();

            try {

                Bck2BrwsrJars.configureFrom(null, root)

                    .generate(w);

                w.flush();

                return w.toString();

            } catch (ClassFormatError ex) {

                throw new IOException(ex);

            } finally {

                w.close();

            }

        }

        return null;

    }

    static void compileVM(StringBuilder sb, final Res r) throws IOException {

        final Bck2Brwsr rt;

        try {

            URL u = r.get(InterruptedException.class.getName().replace('.', '/') + ".class", 0);

            if (u == null) {

                throw new IOException("Cannot find InterruptedException class on classpath: " + System.getProperty("java.class.path"));

            }

            rt = configureFrom(u, null, 3);

        } catch (URISyntaxException ex) {

            throw new IOException(ex);

        }

        final Bck2Brwsr all;

        try {

            URL u = r.get(Bck2Brwsr.class.getName().replace('.', '/') + ".class", 0);

            all = configureFrom(u, rt, 4);

        } catch (URISyntaxException ex) {

            throw new IOException(ex);

        }

        all

            .standalone(true)

            //.obfuscation(ObfuscationLevel.FULL)

            .resources(new Bck2Brwsr.Resources() {

                @Override

                public InputStream get(String resource) throws IOException {

                    final URL url = r.get(resource, 0);

                    return url == null ? null : url.openStream();

                }

            }).generate(sb);

    }

    static Bck2Brwsr configureFrom(URL u, Bck2Brwsr rt, int parents) throws IOException, URISyntaxException {

        final URLConnection conn = u.openConnection();

        if (conn instanceof JarURLConnection) {

            JarURLConnection juc = (JarURLConnection)conn;

            rt = Bck2BrwsrJars.configureFrom(null, new File(juc.getJarFileURL().toURI()));

        } else if (u.getProtocol().equals("file")) {

            File dir = new File(u.toURI());

            while (parents-- > 0) {

                dir = dir.getParentFile();

            }

            rt = Bck2BrwsrJars.configureFrom(null, dir);

        } else {

            throw new FileNotFoundException("Not a JAR or file URL: " + u);

        }

        return rt;

    }

}