/**

 * 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.Closeable;

import org.apache.maven.plugin.AbstractMojo;

import java.io.File;

import java.io.IOException;

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 org.apache.maven.artifact.Artifact;

import org.apache.maven.model.Resource;

import org.apache.maven.plugin.MojoExecutionException;

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.apidesign.bck2brwsr.launcher.Launcher;

/** Executes given HTML page in a browser. */

@Mojo(

    name="brwsr",

    requiresDependencyResolution = ResolutionScope.RUNTIME,

    defaultPhase=LifecyclePhase.NONE

)

public class BrwsrMojo extends AbstractMojo {

    public BrwsrMojo() {

    }

    /** The identification of a launcher to use. Known values <code>fxbrwsr</code>, 

     * <code>bck2brwsr</code>, or 

     * name of an external process to execute.

     */

    @Parameter

    private String launcher;

    /** Resource to show as initial page */

    @Parameter

    private String startpage;

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

    private MavenProject prj;

    /** Root of the class files */

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

    private File classes;

    /** Root of all pages, and files, etc. */

    @Parameter

    private File directory;

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

    private File javascript;

    @Override

    public void execute() throws MojoExecutionException {

        if (startpage == null) {

            throw new MojoExecutionException("You have to provide a start page");

        }

        if (javascript != null && javascript.isFile()) {

            System.setProperty("bck2brwsr.js", javascript.toURI().toString());

        }

        try {

            Closeable httpServer;

            if (directory != null) {

                URLClassLoader url = buildClassLoader(classes, prj.getArtifacts());

                httpServer = Launcher.showDir(launcher, directory, url, startpage);

            } else {

                URLClassLoader url = buildClassLoader(classes, prj.getArtifacts());

                try {

                    for (Resource r : prj.getResources()) {

                        File f = new File(r.getDirectory(), startpage().replace('/', File.separatorChar));

                        if (f.exists()) {

                            System.setProperty("startpage.file", f.getPath());

                        }

                    }

                    httpServer = Launcher.showURL(launcher, url, startpage());

                } catch (Exception ex) {

                    throw new MojoExecutionException("Can't open " + startpage(), ex);

                }

            }

            System.in.read();

            httpServer.close();

        } catch (IOException ex) {

            throw new MojoExecutionException("Can't show the browser", ex);

        }

    }

    private String startpage() {

        return startpage;

    }

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

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

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

        for (Artifact a : deps) {

            final File f = a.getFile();

            if (f != null) {

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

            }

        }

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

    }

}