/*

 * Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package jdk.jpackage.internal;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.PrintStream;

import java.nio.file.Files;

import java.nio.file.Path;

import java.text.MessageFormat;

import java.util.List;

import java.util.Map;

import java.util.ResourceBundle;

import java.util.ArrayList;

import jdk.jpackage.internal.resources.ResourceLocator;

import static jdk.jpackage.internal.StandardBundlerParam.*;

/*

 * AbstractAppImageBuilder

 *     This is sub-classed by each of the platform dependent AppImageBuilder

 */

public abstract class AbstractAppImageBuilder {

    private static final ResourceBundle I18N = ResourceBundle.getBundle(

            "jdk.jpackage.internal.resources.MainResources");

    private final Path root;

    public AbstractAppImageBuilder(Map<String, Object> unused, Path root) {

        this.root = root;

    }

    public InputStream getResourceAsStream(String name) {

        return ResourceLocator.class.getResourceAsStream(name);

    }

    public abstract void prepareApplicationFiles(

            Map<String, ? super Object> params) throws IOException;

    public abstract void prepareJreFiles(

            Map<String, ? super Object> params) throws IOException;

    public abstract Path getAppDir();

    public abstract Path getAppModsDir();

    public Path getRoot() {

        return this.root;

    }

    protected void copyEntry(Path appDir, File srcdir, String fname)

            throws IOException {

        Path dest = appDir.resolve(fname);

        Files.createDirectories(dest.getParent());

        File src = new File(srcdir, fname);

        if (src.isDirectory()) {

            IOUtils.copyRecursive(src.toPath(), dest);

        } else {

            Files.copy(src.toPath(), dest);

        }

    }

    protected InputStream locateResource(String publicName, String category,

            String defaultName, File customFile,

            boolean verbose, File publicRoot) throws IOException {

        InputStream is = null;

        boolean customFromClasspath = false;

        boolean customFromFile = false;

        if (publicName != null) {

            if (publicRoot != null) {

                File publicResource = new File(publicRoot, publicName);

                if (publicResource.exists() && publicResource.isFile()) {

                    is = new FileInputStream(publicResource);

                }

            } else {

                is = getResourceAsStream(publicName);

            }

            customFromClasspath = (is != null);

        }

        if (is == null && customFile != null) {

            is = new FileInputStream(customFile);

            customFromFile = (is != null);

        }

        if (is == null && defaultName != null) {

            is = getResourceAsStream(defaultName);

        }

        if (verbose) {

            String msg = null;

            if (customFromClasspath) {

                msg = MessageFormat.format(I18N.getString(

                    "message.using-custom-resource"),

                    category == null ? "" : "[" + category + "] ", publicName);

            } else if (customFromFile) {

                msg = MessageFormat.format(I18N.getString(

                    "message.using-custom-resource-from-file"),

                    category == null ? "" : "[" + category + "] ",

                    customFile.getAbsoluteFile());

            } else if (is != null) {

                msg = MessageFormat.format(I18N.getString(

                    "message.using-default-resource"),

                    defaultName,

                    category == null ? "" : "[" + category + "] ",

                    publicName);

            } else {

                msg = MessageFormat.format(I18N.getString(

                    "message.no-default-resource"),

                    defaultName == null ? "" : defaultName,

                    category == null ? "" : "[" + category + "] ",

                    publicName);

            }

            if (msg != null) {

                Log.verbose(msg);

            }

        }

        return is;

    }

    protected String preprocessTextResource(String publicName, String category,

            String defaultName, Map<String, String> pairs,

            boolean verbose, File publicRoot) throws IOException {

        InputStream inp = locateResource(publicName, category,

                defaultName, null, verbose, publicRoot);

        if (inp == null) {

            throw new RuntimeException(

                    "Module corrupt? No "+defaultName+" resource!");

        }

        try (InputStream is = inp) {

            //read fully into memory

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            byte[] buffer = new byte[1024];

            int length;

            while ((length = is.read(buffer)) != -1) {

                baos.write(buffer, 0, length);

            }

            //substitute

            String result = new String(baos.toByteArray());

            for (Map.Entry<String, String> e : pairs.entrySet()) {

                if (e.getValue() != null) {

                    result = result.replace(e.getKey(), e.getValue());

                }

            }

            return result;

        }

    }

    public void writeCfgFile(Map<String, ? super Object> params,

            File cfgFileName) throws IOException {

        cfgFileName.delete();

        File mainJar = JLinkBundlerHelper.getMainJar(params);

        ModFile.ModType mainJarType = ModFile.ModType.Unknown;

        if (mainJar != null) {

            mainJarType = new ModFile(mainJar).getModType();

        }

        String mainModule = StandardBundlerParam.MODULE.fetchFrom(params);

        try (PrintStream out = new PrintStream(cfgFileName)) {

            out.println("[Application]");

            out.println("app.name=" + APP_NAME.fetchFrom(params));

            out.println("app.version=" + VERSION.fetchFrom(params));

            out.println("app.runtime=" + getCfgRuntimeDir());

            out.println("app.identifier=" + IDENTIFIER.fetchFrom(params));

            out.println("app.classpath="

                    + getCfgClassPath(CLASSPATH.fetchFrom(params)));

            // The main app is required to be a jar, modular or unnamed.

            if (mainModule != null &&

                    (mainJarType == ModFile.ModType.Unknown ||

                    mainJarType == ModFile.ModType.ModularJar)) {

                out.println("app.mainmodule=" + mainModule);

            } else {

                String mainClass = JLinkBundlerHelper.getMainClass(params);

                // If the app is contained in an unnamed jar then launch it the

                // legacy way and the main class string must be

                // of the format com/foo/Main

                if (mainJar != null) {

                    out.println("app.mainjar=" + getCfgAppDir()

                            + mainJar.toPath().getFileName().toString());

                }

                if (mainClass != null) {

                    out.println("app.mainclass="

                            + mainClass.replace("\\", "/"));

                }

            }

            out.println();

            out.println("[JavaOptions]");

            List<String> jvmargs = JAVA_OPTIONS.fetchFrom(params);

            for (String arg : jvmargs) {

                out.println(arg);

            }

            Path modsDir = getAppModsDir();

            if (modsDir != null && modsDir.toFile().exists()) {

                out.println("--module-path");

                out.println(getCfgAppDir().replace("\\","/") + "mods");

            }

            out.println();

            out.println("[ArgOptions]");

            List<String> args = ARGUMENTS.fetchFrom(params);

            for (String arg : args) {

                if (arg.endsWith("=") &&

                        (arg.indexOf("=") == arg.lastIndexOf("="))) {

                    out.print(arg.substring(0, arg.length() - 1));

                    out.println("\\=");

                } else {

                    out.println(arg);

                }

            }

        }

    }

    File getRuntimeImageDir(File runtimeImageTop) {

        return runtimeImageTop;

    }

    String getCfgAppDir() {

        return "$APPDIR" + File.separator

                + getAppDir().getFileName() + File.separator;

    }

    String getCfgRuntimeDir() {

        return "$APPDIR" + File.separator + "runtime";

    }

    String getCfgClassPath(String classpath) {

        String cfgAppDir = getCfgAppDir();

        StringBuilder sb = new StringBuilder();

        for (String path : classpath.split("[:;]")) {

            if (path.length() > 0) {

                sb.append(cfgAppDir);

                sb.append(path);

                sb.append(File.pathSeparator);

            }

        }

        if (sb.length() > 0) {

            sb.deleteCharAt(sb.length() - 1);

        }

        return sb.toString();

    }

}