/**

 * 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.io.StringWriter;

import java.net.JarURLConnection;

import java.net.URISyntaxException;

import java.net.URL;

import java.util.ArrayList;

import java.util.Enumeration;

import java.util.List;

import java.util.Set;

import java.util.logging.Level;

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);

        }

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

            if (!f.getPath().startsWith(s)) {

                continue;

            }

            File root = new File(s);

            List<String> arr = new ArrayList<>();

            List<String> classes = new ArrayList<>();

            listDir(root, null, classes, arr);

            StringWriter w = new StringWriter();

            try {

                Bck2Brwsr.newCompiler()

                    .addRootClasses(classes.toArray(new String[0]))

                    .addResources(arr.toArray(new String[0]))

                    .library()

                    //.obfuscation(ObfuscationLevel.FULL)

                    .resources(new EmulationResources() {

                        @Override

                        public InputStream get(String resource) throws IOException {

                            if (r != null) {

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

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

                            }

                            return super.get(resource);

                        }

                    })

                    .generate(w);

                w.flush();

                return w.toString();

            } catch (ClassFormatError ex) {

                throw new IOException(ex);

            } finally {

                w.close();

            }

        }

        return null;

    }

    private static void listDir(File f, String pref, List<String> classes, List<String> resources) throws IOException {

        File[] arr = f.listFiles();

        if (arr == null) {

            if (f.getName().endsWith(".class")) {

                classes.add(pref + f.getName().substring(0, f.getName().length() - 6));

            } else {

                resources.add(pref + f.getName());

            }

        } else {

            for (File ch : arr) {

                listDir(ch, pref == null ? "" : pref + f.getName() + "/", classes, resources);

            }

        }

    }

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

        final Bck2Brwsr rt;

        try {

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

            JarURLConnection juc = (JarURLConnection)u.openConnection();

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

        } catch (URISyntaxException ex) {

            throw new IOException(ex);

        }

        final Bck2Brwsr all;

        try {

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

            JarURLConnection juc = (JarURLConnection)u.openConnection();

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

        } 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 class EmulationResources implements Bck2Brwsr.Resources {

        @Override

        public InputStream get(String name) throws IOException {

            Enumeration<URL> en = Bck2BrwsrJars.class.getClassLoader().getResources(name);

            URL u = null;

            while (en.hasMoreElements()) {

                u = en.nextElement();

            }

            if (u == null) {

                LOG.log(Level.WARNING, "Cannot find {0}", name);

                return null;

            }

            if (u.toExternalForm().contains("/rt.jar!")) {

                LOG.log(Level.WARNING, "{0}No bootdelegation for ", name);

                return null;

            }

            return u.openStream();

        }

    }

}