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The start utility
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//
//  ========================================================================
//  Copyright (c) 1995-2018 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.start.builders;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;

import org.eclipse.jetty.start.BaseBuilder;
import org.eclipse.jetty.start.BaseHome;
import org.eclipse.jetty.start.FS;
import org.eclipse.jetty.start.Module;
import org.eclipse.jetty.start.StartLog;
import org.eclipse.jetty.start.graph.OnlyTransitivePredicate;

/**
 * Management of the ${jetty.base}/start.d/ based configuration.
 * 
 * Implementation of the --add-to-startd=[name] command line behavior
 */
public class StartDirBuilder implements BaseBuilder.Config
{
    private final BaseHome baseHome;
    private final Path startDir;

    public StartDirBuilder(BaseBuilder baseBuilder) throws IOException
    {
        this.baseHome = baseBuilder.getBaseHome();
        this.startDir = baseHome.getBasePath("start.d");
        FS.ensureDirectoryExists(startDir);
    }

    @Override
    public boolean addModule(Module module) throws IOException
    {
        if (module.isDynamic())
        {
            if (module.hasIniTemplate())
            {
                // warn
                StartLog.warn("%-15s not adding [ini-template] from dynamic module",module.getName());
            }
            return false;
        }

        String mode = "";
        boolean isTransitive = module.matches(OnlyTransitivePredicate.INSTANCE);
        if (isTransitive)
        {
            mode = "(transitively) ";
        }

        if (module.hasIniTemplate() || !isTransitive)
        {
            // Create start.d/{name}.ini
            Path ini = startDir.resolve(module.getName() + ".ini");
            StartLog.info("%-15s initialised %sin %s",module.getName(),mode,baseHome.toShortForm(ini));

            try (BufferedWriter writer = Files.newBufferedWriter(ini,StandardCharsets.UTF_8,StandardOpenOption.CREATE,StandardOpenOption.TRUNCATE_EXISTING))
            {
                writeModuleSection(writer,module);
            }
            return true;
        }

        return false;
    }

    protected void writeModuleSection(BufferedWriter writer, Module module)
    {
        PrintWriter out = new PrintWriter(writer);

        out.println("# --------------------------------------- ");
        out.println("# Module: " + module.getName());
        out.println("--module=" + module.getName());
        out.println();

        for (String line : module.getIniTemplate())
        {
            out.println(line);
        }

        out.println();
        out.flush();
    }
}