/*

 * Copyright (c) 2012, 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.*;

import java.nio.charset.StandardCharsets;

import java.nio.file.FileVisitResult;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.SimpleFileVisitor;

import java.nio.file.attribute.BasicFileAttributes;

import java.nio.file.attribute.PosixFilePermission;

import java.nio.file.attribute.PosixFilePermissions;

import java.text.MessageFormat;

import java.util.*;

import java.util.regex.Pattern;

import java.util.stream.Stream;

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

import static jdk.jpackage.internal.LinuxPackageBundler.I18N;

public class LinuxDebBundler extends LinuxPackageBundler {

    // Debian rules for package naming are used here

    // https://www.debian.org/doc/debian-policy/ch-controlfields.html#s-f-Source

    //

    // Package names must consist only of lower case letters (a-z),

    // digits (0-9), plus (+) and minus (-) signs, and periods (.).

    // They must be at least two characters long and

    // must start with an alphanumeric character.

    //

    private static final Pattern DEB_PACKAGE_NAME_PATTERN =

            Pattern.compile("^[a-z][a-z\\d\\+\\-\\.]+");

    private static final BundlerParamInfo<String> PACKAGE_NAME =

            new StandardBundlerParam<> (

            Arguments.CLIOptions.LINUX_BUNDLE_NAME.getId(),

            String.class,

            params -> {

                String nm = APP_NAME.fetchFrom(params);

                if (nm == null) return null;

                // make sure to lower case and spaces/underscores become dashes

                nm = nm.toLowerCase().replaceAll("[ _]", "-");

                return nm;

            },

            (s, p) -> {

                if (!DEB_PACKAGE_NAME_PATTERN.matcher(s).matches()) {

                    throw new IllegalArgumentException(new ConfigException(

                            MessageFormat.format(I18N.getString(

                            "error.invalid-value-for-package-name"), s),

                            I18N.getString(

                            "error.invalid-value-for-package-name.advice")));

                }

                return s;

            });

    private static final BundlerParamInfo<String> FULL_PACKAGE_NAME =

            new StandardBundlerParam<>(

                    "linux.deb.fullPackageName", String.class, params -> {

                        try {

                            return PACKAGE_NAME.fetchFrom(params)

                            + "_" + VERSION.fetchFrom(params)

                            + "-" + RELEASE.fetchFrom(params)

                            + "_" + getDebArch();

                        } catch (IOException ex) {

                            Log.verbose(ex);

                            return null;

                        }

                    }, (s, p) -> s);

    private static final BundlerParamInfo<String> EMAIL =

            new StandardBundlerParam<> (

            Arguments.CLIOptions.LINUX_DEB_MAINTAINER.getId(),

            String.class,

            params -> "Unknown",

            (s, p) -> s);

    private static final BundlerParamInfo<String> MAINTAINER =

            new StandardBundlerParam<> (

            BundleParams.PARAM_MAINTAINER,

            String.class,

            params -> VENDOR.fetchFrom(params) + " <"

                    + EMAIL.fetchFrom(params) + ">",

            (s, p) -> s);

    private static final BundlerParamInfo<String> SECTION =

            new StandardBundlerParam<>(

            Arguments.CLIOptions.LINUX_CATEGORY.getId(),

            String.class,

            params -> "misc",

            (s, p) -> s);

    private static final BundlerParamInfo<String> LICENSE_TEXT =

            new StandardBundlerParam<> (

            "linux.deb.licenseText",

            String.class,

            params -> {

                try {

                    String licenseFile = LICENSE_FILE.fetchFrom(params);

                    if (licenseFile != null) {

                        StringBuilder contentBuilder = new StringBuilder();

                        try (Stream<String> stream = Files.lines(Path.of(

                                licenseFile), StandardCharsets.UTF_8)) {

                            stream.forEach(s -> contentBuilder.append(s).append(

                                    "\n"));

                        }

                        return contentBuilder.toString();

                    }

                } catch (Exception e) {

                    Log.verbose(e);

                }

                return "Unknown";

            },

            (s, p) -> s);

    private static final BundlerParamInfo<String> COPYRIGHT_FILE =

            new StandardBundlerParam<>(

            Arguments.CLIOptions.LINUX_DEB_COPYRIGHT_FILE.getId(),

            String.class,

            params -> null,

            (s, p) -> s);

    private final static String TOOL_DPKG_DEB = "dpkg-deb";

    private final static String TOOL_DPKG = "dpkg";

    public static boolean testTool(String toolName, String minVersion) {

        try {

            ProcessBuilder pb = new ProcessBuilder(

                    toolName,

                    "--version");

            // not interested in the output

            IOUtils.exec(pb, true, null);

        } catch (Exception e) {

            Log.verbose(MessageFormat.format(I18N.getString(

                    "message.test-for-tool"), toolName, e.getMessage()));

            return false;

        }

        return true;

    }

    public LinuxDebBundler() {

        super(PACKAGE_NAME);

    }

    @Override

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

            throws ConfigException {

        // NOTE: Can we validate that the required tools are available

        // before we start?

        if (!testTool(TOOL_DPKG_DEB, "1")){

            throw new ConfigException(MessageFormat.format(

                    I18N.getString("error.tool-not-found"), TOOL_DPKG_DEB),

                    I18N.getString("error.tool-not-found.advice"));

        }

        if (!testTool(TOOL_DPKG, "1")){

            throw new ConfigException(MessageFormat.format(

                    I18N.getString("error.tool-not-found"), TOOL_DPKG),

                    I18N.getString("error.tool-not-found.advice"));

        }

        // Show warning is license file is missing

        String licenseFile = LICENSE_FILE.fetchFrom(params);

        if (licenseFile == null) {

            Log.verbose(I18N.getString("message.debs-like-licenses"));

        }

    }

    @Override

    protected File buildPackageBundle(

            Map<String, String> replacementData,

            Map<String, ? super Object> params, File outputParentDir) throws

            PackagerException, IOException {

        prepareProjectConfig(replacementData, params);

        adjustPermissionsRecursive(createMetaPackage(params).sourceRoot().toFile());

        return buildDeb(params, outputParentDir);

    }

    /*

     * set permissions with a string like "rwxr-xr-x"

     *

     * This cannot be directly backport to 22u which is built with 1.6

     */

    private void setPermissions(File file, String permissions) {

        Set<PosixFilePermission> filePermissions =

                PosixFilePermissions.fromString(permissions);

        try {

            if (file.exists()) {

                Files.setPosixFilePermissions(file.toPath(), filePermissions);

            }

        } catch (IOException ex) {

            Log.error(ex.getMessage());

            Log.verbose(ex);

        }

    }

    private static String getDebArch() throws IOException {

        try (var baos = new ByteArrayOutputStream();

                var ps = new PrintStream(baos)) {

            var pb = new ProcessBuilder(TOOL_DPKG, "--print-architecture");

            IOUtils.exec(pb, false, ps);

            return baos.toString().split("\n", 2)[0];

        }

    }

    public static boolean isDebian() {

        // we are just going to run "dpkg -s coreutils" and assume Debian

        // or deritive if no error is returned.

        var pb = new ProcessBuilder(TOOL_DPKG, "-s", "coreutils");

        try {

            int ret = pb.start().waitFor();

            return (ret == 0);

        } catch (IOException | InterruptedException e) {

            // just fall thru

        }

        return false;

    }

    private void adjustPermissionsRecursive(File dir) throws IOException {

        Files.walkFileTree(dir.toPath(), new SimpleFileVisitor<Path>() {

            @Override

            public FileVisitResult visitFile(Path file,

                    BasicFileAttributes attrs)

                    throws IOException {

                if (file.endsWith(".so") || !Files.isExecutable(file)) {

                    setPermissions(file.toFile(), "rw-r--r--");

                } else if (Files.isExecutable(file)) {

                    setPermissions(file.toFile(), "rwxr-xr-x");

                }

                return FileVisitResult.CONTINUE;

            }

            @Override

            public FileVisitResult postVisitDirectory(Path dir, IOException e)

                    throws IOException {

                if (e == null) {

                    setPermissions(dir.toFile(), "rwxr-xr-x");

                    return FileVisitResult.CONTINUE;

                } else {

                    // directory iteration failed

                    throw e;

                }

            }

        });

    }

    private class DebianFile {

        DebianFile(Path dstFilePath, String comment) {

            this.dstFilePath = dstFilePath;

            this.comment = comment;

        }

        DebianFile setExecutable() {

            permissions = "rwxr-xr-x";

            return this;

        }

        void create(Map<String, String> data, Map<String, ? super Object> params)

                throws IOException {

            Files.createDirectories(dstFilePath.getParent());

            try (Writer w = Files.newBufferedWriter(dstFilePath)) {

                String content = preprocessTextResource(

                        dstFilePath.getFileName().toString(),

                        I18N.getString(comment),

                        "template." + dstFilePath.getFileName().toString(),

                        data,

                        VERBOSE.fetchFrom(params),

                        RESOURCE_DIR.fetchFrom(params));

                w.write(content);

            }

            if (permissions != null) {

                setPermissions(dstFilePath.toFile(), permissions);

            }

        }

        private final Path dstFilePath;

        private final String comment;

        private String permissions;

    }

    private void prepareProjectConfig(Map<String, String> data,

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

        Path configDir = createMetaPackage(params).sourceRoot().resolve("DEBIAN");

        List<DebianFile> debianFiles = new ArrayList<>();

        debianFiles.add(new DebianFile(

                configDir.resolve("control"),

                "resource.deb-control-file"));

        debianFiles.add(new DebianFile(

                configDir.resolve("preinst"),

                "resource.deb-preinstall-script").setExecutable());

        debianFiles.add(new DebianFile(

                configDir.resolve("prerm"),

                "resource.deb-prerm-script").setExecutable());

        debianFiles.add(new DebianFile(

                configDir.resolve("postinst"),

                "resource.deb-postinstall-script").setExecutable());

        debianFiles.add(new DebianFile(

                configDir.resolve("postrm"),

                "resource.deb-postrm-script").setExecutable());

        getConfig_CopyrightFile(params).getParentFile().mkdirs();

        String customCopyrightFile = COPYRIGHT_FILE.fetchFrom(params);

        if (customCopyrightFile != null) {

            IOUtils.copyFile(new File(customCopyrightFile),

                    getConfig_CopyrightFile(params));

        } else {

            debianFiles.add(new DebianFile(

                    getConfig_CopyrightFile(params).toPath(),

                    "resource.copyright-file"));

        }

        for (DebianFile debianFile : debianFiles) {

            debianFile.create(data, params);

        }

    }

    @Override

    protected Map<String, String> createReplacementData(

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

        Map<String, String> data = new HashMap<>();

        data.put("APPLICATION_MAINTAINER", MAINTAINER.fetchFrom(params));

        data.put("APPLICATION_SECTION", SECTION.fetchFrom(params));

        data.put("APPLICATION_COPYRIGHT", COPYRIGHT.fetchFrom(params));

        data.put("APPLICATION_LICENSE_TEXT", LICENSE_TEXT.fetchFrom(params));

        data.put("APPLICATION_ARCH", getDebArch());

        data.put("APPLICATION_INSTALLED_SIZE", Long.toString(

                createMetaPackage(params).sourceApplicationLayout().sizeInBytes() >> 10));

        return data;

    }

    private File getConfig_CopyrightFile(Map<String, ? super Object> params) {

        PlatformPackage thePackage = createMetaPackage(params);

    }

    private File buildDeb(Map<String, ? super Object> params,

            File outdir) throws IOException {

        File outFile = new File(outdir,

                FULL_PACKAGE_NAME.fetchFrom(params)+".deb");

        Log.verbose(MessageFormat.format(I18N.getString(

                "message.outputting-to-location"), outFile.getAbsolutePath()));

        PlatformPackage thePackage = createMetaPackage(params);

        // run dpkg

        ProcessBuilder pb = new ProcessBuilder(

                "fakeroot", TOOL_DPKG_DEB, "-b",

                thePackage.sourceRoot().toString(),

                outFile.getAbsolutePath());

        IOUtils.exec(pb);

        Log.verbose(MessageFormat.format(I18N.getString(

                "message.output-to-location"), outFile.getAbsolutePath()));

        return outFile;

    }

    @Override

    public String getName() {

        return I18N.getString("deb.bundler.name");

    }

    @Override

    public String getID() {

        return "deb";

    }

    @Override

    public boolean supported(boolean runtimeInstaller) {

        if (Platform.getPlatform() == Platform.LINUX) {

            if (testTool(TOOL_DPKG_DEB, "1")) {

                return true;

            }

        }

        return false;

    }

    @Override

    public boolean isDefault() {

        return isDebian();

    }

}