/**

 * 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.mojo;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.OutputStreamWriter;

import java.io.Writer;

import java.net.MalformedURLException;

import java.net.URL;

import java.net.URLClassLoader;

import java.util.ArrayList;

import java.util.Collection;

import java.util.List;

import java.util.jar.Attributes;

import java.util.jar.JarEntry;

import java.util.jar.JarFile;

import java.util.jar.JarOutputStream;

import java.util.jar.Manifest;

import org.apache.maven.artifact.Artifact;

import org.apache.maven.plugin.AbstractMojo;

import org.apache.maven.plugin.MojoExecutionException;

import org.apache.maven.plugin.MojoFailureException;

import org.apache.maven.plugins.annotations.Component;

import org.apache.maven.plugins.annotations.LifecyclePhase;

import org.apache.maven.plugins.annotations.Mojo;

import org.apache.maven.plugins.annotations.Parameter;

import org.apache.maven.plugins.annotations.ResolutionScope;

import org.apache.maven.project.MavenProject;

import org.apache.maven.project.MavenProjectHelper;

import org.apidesign.bck2brwsr.aot.Bck2BrwsrJars;

import org.apidesign.vm4brwsr.Bck2Brwsr;

import org.apidesign.vm4brwsr.ObfuscationLevel;

/**

 *

 * @author Jaroslav Tulach

 * @since 0.12

 */

@Mojo(name = "library",

    requiresDependencyResolution = ResolutionScope.COMPILE_PLUS_RUNTIME,

    defaultPhase = LifecyclePhase.PACKAGE

)

public class AOTLibrary extends AbstractMojo {

    @Parameter(defaultValue = "${project}")

    private MavenProject prj;

    @Component

    private MavenProjectHelper projectHelper;

    @Parameter(defaultValue = "${project.build.directory}/${project.build.finalName}.jar")

    private File mainJar;    

    @Parameter(defaultValue = "${project.build.finalName}-min.js")

    private String minified;

    @Parameter(defaultValue = "${project.build.finalName}-debug.js")

    private String debug;

    @Parameter(defaultValue = "${project.build.directory}/${project.build.finalName}-bck2brwsr.jar")

    private File aotJar;

    @Parameter

    private String[] exports;

    @Parameter

    private String[] aotDeps;

    @Parameter(defaultValue = "true")

    private boolean ignoreBootClassPath;

    /**

     * The obfuscation level for the generated minified JavaScript file.

     * @since 0.5

     */

    @Parameter(defaultValue = "FULL")

    private ObfuscationLevel obfuscation;

    @Override

    public void execute() throws MojoExecutionException, MojoFailureException {

        URLClassLoader loader;

        try {

            loader = buildClassLoader(mainJar, prj.getArtifacts());

        } catch (MalformedURLException ex) {

            throw new MojoFailureException("Can't initialize classloader");

        }

        try {

            Manifest m = new Manifest();

            if (!"false".equals(minified)) {

                Attributes attr = new Attributes();

                attr.putValue("Bck2BrwsrArtifactId", prj.getArtifactId());

                attr.putValue("Bck2BrwsrGroupId", prj.getGroupId());

                attr.putValue("Bck2BrwsrVersion", prj.getVersion());

                attr.putValue("Bck2BrwsrMinified", "true");

                bundleName(attr, mainJar);

                m.getEntries().put(minified, attr);

            }

            if (!"false".equals(debug)) {

                Attributes attr = new Attributes();

                attr.putValue("Bck2BrwsrArtifactId", prj.getArtifactId());

                attr.putValue("Bck2BrwsrGroupId", prj.getGroupId());

                attr.putValue("Bck2BrwsrVersion", prj.getVersion());

                attr.putValue("Bck2BrwsrDebug", "true");

                bundleName(attr, mainJar);

                m.getEntries().put(debug, attr);

            }

            if (aotDeps != null) {

                for (Artifact a : prj.getArtifacts()) {

                    if (!matches(aotDeps, a)) {

                        continue;

                    }

                    {

                        Attributes attr = new Attributes();

                        attr.putValue("Bck2BrwsrArtifactId", a.getArtifactId());

                        attr.putValue("Bck2BrwsrGroupId", a.getGroupId());

                        attr.putValue("Bck2BrwsrVersion", a.getVersion());

                        attr.putValue("Bck2BrwsrDebug", "true");

                        bundleName(attr, a.getFile());

                        m.getEntries().put(artifactName(a, true), attr);

                    }

                    {

                        Attributes attr = new Attributes();

                        attr.putValue("Bck2BrwsrArtifactId", a.getArtifactId());

                        attr.putValue("Bck2BrwsrGroupId", a.getGroupId());

                        attr.putValue("Bck2BrwsrVersion", a.getVersion());

                        attr.putValue("Bck2BrwsrMinified", "true");

                        bundleName(attr, a.getFile());

                        m.getEntries().put(artifactName(a, false), attr);

                    }

                }

            }

            JarOutputStream os = null;

            if (!"false".equals(debug)) {

                if (os == null) {

                    os = aotJar(m);

                }

                os.putNextEntry(new JarEntry(debug));

                Writer w = new OutputStreamWriter(os, "UTF-8");

                configureMain(loader).

                    obfuscation(ObfuscationLevel.NONE).

                    generate(w);

                w.flush();

                os.closeEntry();

            }

            if (!"false".equals(minified)) {

                if (os == null) {

                    os = aotJar(m);

                }

                os.putNextEntry(new JarEntry(minified));

                Writer w = new OutputStreamWriter(os, "UTF-8");

                configureMain(loader).

                    obfuscation(obfuscation).

                    generate(w);

                w.flush();

                os.closeEntry();

            }

            if (aotDeps != null) {

                for (Artifact a : prj.getArtifacts()) {

                    if (!matches(aotDeps, a)) {

                        continue;

                    }

                    getLog().info("Generating bck2brwsr for " + a.getFile());

                    Bck2Brwsr c = Bck2BrwsrJars.configureFrom(null, a.getFile(), loader, ignoreBootClassPath);

                    if (exports != null) {

                        for (String e : exports) {

                            c = c.addExported(e.replace('.', '/'));

                        }

                    }

                    {

                        if (os == null) {

                            os = aotJar(m);

                        }

                        os.putNextEntry(new JarEntry(artifactName(a, true)));

                        Writer w = new OutputStreamWriter(os, "UTF-8");

                        c.

                            obfuscation(ObfuscationLevel.NONE).

                            generate(w);

                        w.flush();

                        os.closeEntry();

                    }

                    {

                        os.putNextEntry(new JarEntry(artifactName(a, false)));

                        Writer w = new OutputStreamWriter(os, "UTF-8");

                        c.

                            obfuscation(ObfuscationLevel.FULL).

                            generate(w);

                        w.flush();

                        os.closeEntry();

                    }                    

                }

            }

            if (os != null) {

                os.close();

            }

            projectHelper.attachArtifact(prj, "jar", "bck2brwsr", aotJar);

        } catch (IOException ex) {

            throw new MojoFailureException("Cannot generate script for " + mainJar, ex);

        }

    }

    private JarOutputStream aotJar(Manifest m) throws IOException, FileNotFoundException {

        this.aotJar.getParentFile().mkdirs();

        FileOutputStream fos = new FileOutputStream(this.aotJar);

        JarOutputStream os = new JarOutputStream(fos, m);

        return os;

    }

    private Bck2Brwsr configureMain(URLClassLoader loader) throws IOException {

        Bck2Brwsr c = Bck2BrwsrJars.configureFrom(null, mainJar, loader, ignoreBootClassPath);

        if (exports != null) {

            for (String e : exports) {

                c = c.addExported(e.replace('.', '/'));

            }

        }

        return c;

    }

    private static String artifactName(Artifact a, boolean debug) {

        return a.getGroupId() + "-" + a.getArtifactId() + (debug ? "-debug.js" : "-min.js");

    }

    private static void bundleName(Attributes attr, File file) throws IOException {

        try (JarFile jf = new JarFile(file)) {

            Attributes main = jf.getManifest().getMainAttributes();

            String version = main.getValue("Bundle-SymbolicName");

            if (version == null) {

                version = main.getValue("OpenIDE-Module-Name");

            }

            if (version != null) {

                attr.putValue("Bck2BrwsrName", version);

            }

        }

    }

    private static URLClassLoader buildClassLoader(File root, Collection<Artifact> deps) throws MalformedURLException {

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

        if (root != null) {

            arr.add(root.toURI().toURL());

        }

        for (Artifact a : deps) {

            if (a.getFile() != null) {

                arr.add(a.getFile().toURI().toURL());

            }

        }

        return new URLClassLoader(arr.toArray(new URL[0]), Java2JavaScript.class.getClassLoader());

    }

    private static boolean matches(String[] aotDeps, Artifact a) {

        for (String d : aotDeps) {

            String[] parts = d.split(":");

            for (int i = 0; i < parts.length; i++) {

                if ("*".equals(parts[i])) {

                    parts[i] = null;

                }

            }

            if (parts[0] != null && !parts[0].equals(a.getGroupId())) {

                continue;

            }

            if (parts[1] != null && !parts[1].equals(a.getArtifactId())) {

                continue;

            }

            if (parts.length > 2 && parts[2] != null && !parts[2].equals(a.getClassifier())) {

                continue;

            }

            return true;

        }

        return false;

    }

}