/*

 * Copyright (c) 2018, 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.

 *

 * 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 jnlp.converter;

import java.io.File;

import java.util.ArrayList;

import java.util.List;

public class Options {

    private boolean createInstaller = false;

    private String installerType = null;

    private String jnlp = null;

    private String output = null;

    private String keep = null;

    private boolean help = false;

    private boolean verbose = false;

    private boolean version = false;

    private final List<String> jpackageOptions = new ArrayList<>();

    private boolean isRuntimeImageSet = false;

    private static final String JNLP_OPTION_PREFIX = "--jnlp=";

    private static final String OUTPUT_OPTION_PREFIX = "--output=";

    private static final String KEEP_OPTION_PREFIX = "--keep=";

    private static final String JNLP_OPTION_SHORT_PREFIX = "-j";

    private static final String OUTPUT_OPTION_SHORT_PREFIX = "-o";

    private static final String KEEP_OPTION_SHORT_PREFIX = "-k";

    private static final String [] INSTALLER_TYPES = {"msi", "exe", "dmg", "pkg",

                                                      "rpm", "deb"};

    private static final String [] BLOCKED_JPACKAGE_OPTIONS = {"--output", "-o", "--input", "-i",

    private static final String RUNTIME_IMAGE_OPTION = "--runtime-image";

    private static final String ERR_UNKNOWN_OPTION = "Unknown option: ";

    private static final String ERR_MISSING_VALUE = "Value is required for option ";

    private static final String ERR_MISSING_JNLP = "Error: --jnlp is required";

    private static final String ERR_MISSING_OUTPUT = "Error: --output is required";

    private static final String ERR_OUTPUT_EXISTS = "Error: output folder already exists";

    private static final String ERR_KEEP_EXISTS = "Error: folder for --keep argument already exists";

    private static final String ERR_INVALID_PROTOCOL_JNLP = "Error: Invalid protocol for JNLP file. Only HTTP, HTTPS and FILE protocols are supported.";

    }

    public boolean createInstaller() {

        return createInstaller;

    }

    public String getInstallerType() {

        return installerType;

    }

    public String getJNLP() {

        return jnlp;

    }

    public String getOutput() {

        return output;

    }

    public String keep() {

        return keep;

    }

    public boolean help() {

        return help;

    }

    public boolean verbose() {

        return verbose;

    }

    public boolean version() {

        return version;

    }

    public List<String> getJPackageOptions() {

        return jpackageOptions;

    }

    public boolean isRuntimeImageSet() {

        return isRuntimeImageSet;

    }

    // Helper method to dump all options

    private void display() {

        System.out.println("Options:");

        System.out.println("createInstaller: " + createInstaller);

        System.out.println("installerType: " + installerType);

        System.out.println("jnlp: " + jnlp);

        System.out.println("output: " + output);

        System.out.println("keep: " + keep);

        System.out.println("help: " + help);

        System.out.println("verbose: " + verbose);

        System.out.println("version: " + version);

        for (int i = 0; i < jpackageOptions.size(); i++) {

            System.out.println("jpackageOptions[" + i + "]: " + jpackageOptions.get(i));

        }

    }

    private void validate() {

        if (help || version) {

            return;

        }

            optionError(ERR_MISSING_MODE);

        }

        if (jnlp == null) {

            optionError(ERR_MISSING_JNLP);

        } else {

            int index = jnlp.indexOf(":");

            if (index == -1 || index == 0) {

                optionError(ERR_INVALID_PROTOCOL_JNLP);

            } else {

                String protocol = jnlp.substring(0, index);

                if (!protocol.equalsIgnoreCase("http") &&

                    !protocol.equalsIgnoreCase("https") &&

                    !protocol.equalsIgnoreCase("file")) {

                    optionError(ERR_INVALID_PROTOCOL_JNLP);

                }

            }

        }

        if (output == null) {

            optionError(ERR_MISSING_OUTPUT);

        } else {

            File file = new File(output);

            if (file.exists()) {

                optionErrorNoHelp(ERR_OUTPUT_EXISTS);

            }

        }

        if (keep != null) {

            File file = new File(keep);

            if (file.exists()) {

                optionErrorNoHelp(ERR_KEEP_EXISTS);

            }

        }

        jpackageOptions.forEach((option) -> {

            if (isBlockedOption(option)) {

                Log.error(option + " is not allowed via --jpackage-options, since it will conflict with "

                        + "same option generated by JNLPConverter.");

            }

        });

    }

    public boolean isOptionPresent(String option) {

        for (String jpackageOption : jpackageOptions) {

            if (jpackageOption.equalsIgnoreCase(option)) {

                return true;

            }

        }

        return false;

    }

    private boolean isBlockedOption(String option) {

        for (String blockedOption : BLOCKED_JPACKAGE_OPTIONS) {

            if (blockedOption.equalsIgnoreCase(option)) {

                return true;

            }

        }

        return false;

    }

    public static void showHelp() {

//      System.out.println("********* Help should not be longer then 80 characters as per JEP-293 *********");

        System.out.println("Usage: java -jar JNLPConverter.jar <mode> <options>");

        System.out.println("");

        System.out.println("where mode is one of:");

        System.out.println("          Generates a platform-specific application image.");

        System.out.println("  create-installer");

        System.out.println("          Generates a platform-specific installer for the application.");

        System.out.println("");

        System.out.println("Possible options include:");

        System.out.println("  -j, --jnlp <path>");

        System.out.println("          Full path to JNLP file. Supported protocols are HTTP/HTTPS/FILE.");

        System.out.println("  -o, --output <path>");

        System.out.println("          Name of the directory where generated output files are placed.");

        System.out.println("  -k, --keep <path>");

        System.out.println("          Keep JNLP, JARs and command line arguments for jpackage");

        System.out.println("          in directory provided.");

        System.out.println("      --jpackage-options <options>");

        System.out.println("          Specify additional jpackage options or overwrite provided by JNLPConverter.");

        System.out.println("          All jpackage options can be specified except: --output -o, --input -i,");

        System.out.println("      --installer-type <type>");

        System.out.println("          The type of the installer to create");

        System.out.println("          Valid values are: {\"exe\", \"msi\", \"rpm\", \"deb\", \"pkg\", \"dmg\"}");

        System.out.println("          If this option is not specified (in create-installer mode) all");

        System.out.println("          supported types of installable packages for the current");

        System.out.println("          platform will be created.");

        System.out.println("  -h, --help, -?");

        System.out.println("          Print this help message");

        System.out.println("  -v, --verbose");

        System.out.println("          Enable verbose output.");

        System.out.println("      --version");

        System.out.println("          Version information.");

        System.out.println("To specify an argument for a long option, you can use --<name>=<value> or");

        System.out.println("--<name> <value>.");

        System.out.println("To specify proxy server use standard Java properties http.proxyHost and http.proxyPort.");

    }

    private static boolean isInstallerType(String type) {

        for (String installerType : INSTALLER_TYPES) {

            if (installerType.equals(type)) {

                return true;

            }

        }

        return false;

    }

    public static Options parseArgs(String[] args) {

        Options options = new Options();

        int index = 0;

        if (args.length >= 1) {

            switch (args[0]) {

                    index = 1;

                    break;

                case "create-installer":

                    options.createInstaller = true;

                    index = 1;

                    break;

                case "-h":

                case "--help":

                case "-?":

                case "--version":

                    break;

                default:

                    optionError(Options.ERR_MISSING_MODE);

                    break;

            }

        }

        for (int i = index; i < args.length; i++) {

            String arg = args[i];

            if (arg.equals("--jnlp")) {

                if (++i >= args.length) {

                    optionError(Options.ERR_MISSING_VALUE, "--jnlp");

                }

                options.jnlp = args[i];

            }  else if (arg.startsWith(JNLP_OPTION_PREFIX)) {

                options.jnlp = arg.substring(JNLP_OPTION_PREFIX.length());

            } else if (arg.equals("--output")) {

                if (++i >= args.length) {

                    optionError(Options.ERR_MISSING_VALUE, "--output");

                }

                options.output = args[i];

            } else if (arg.startsWith(OUTPUT_OPTION_PREFIX)) {

                options.output = arg.substring(OUTPUT_OPTION_PREFIX.length());

            } else if (arg.equals("--keep")) {

                if (++i >= args.length) {

                    optionError(Options.ERR_MISSING_VALUE, "--keep");

                }

                options.keep = args[i];

            } else if (arg.startsWith(KEEP_OPTION_PREFIX)) {

                options.keep = arg.substring(KEEP_OPTION_PREFIX.length());

            } else if (arg.equals("--help")) {

                options.help = true;

            } else if (arg.equals("--verbose")) {

                options.verbose = true;

            } else if (arg.equals("--version")) {

                options.version = true;

            } else if (arg.equals("-j")) { // short options

                if (++i >= args.length) {

                    optionError(Options.ERR_MISSING_VALUE, "-j");

                }

                options.jnlp = args[i];

            } else if (arg.startsWith(JNLP_OPTION_SHORT_PREFIX)) {

                options.jnlp = arg.substring(JNLP_OPTION_SHORT_PREFIX.length());

            } else if (arg.equals("-o")) {

                if (++i >= args.length) {

                    optionError(Options.ERR_MISSING_VALUE, "-o");

                }

                options.output = args[i];

            } else if (arg.startsWith(OUTPUT_OPTION_SHORT_PREFIX)) {

                options.output = arg.substring(OUTPUT_OPTION_SHORT_PREFIX.length());

            } else if (arg.equals("-k")) {

                if (++i >= args.length) {

                    optionError(Options.ERR_MISSING_VALUE, "-k");

                }

                options.keep = args[i];

            } else if (arg.startsWith(KEEP_OPTION_SHORT_PREFIX)) {

                options.keep = arg.substring(KEEP_OPTION_SHORT_PREFIX.length());

            } else if (arg.equals("-h") || arg.equals("-?")) {

                options.help = true;

            } else if (arg.equals("-v")) {

                options.verbose = true;

            } else if (arg.equals("--jpackage-options")) {

                for (i = (i + 1); i < args.length; i++) {

                    if (!options.isRuntimeImageSet) {

                        if (args[i].equals(RUNTIME_IMAGE_OPTION)) {

                            options.isRuntimeImageSet = true;

                        }

                    }

                    options.jpackageOptions.add(args[i]);

                }

            } else if (arg.equals("--installer-type")) {

                if ((i + 1) < args.length) {

                    if (isInstallerType(args[i + 1])) {

                        options.installerType = args[i + 1];

                        i++;

                    }

                }

            } else {

                optionError(ERR_UNKNOWN_OPTION, arg);

            }

        }

        //options.display(); // For testing only

        options.validate();

        return options;

    }

    private static void optionErrorNoHelp(String msg) {

        System.out.println(msg);

        System.exit(1);

    }

    private static void optionError(String msg) {

        System.out.println(msg);

        System.out.println();

        showHelp();

        System.exit(1);

    }

    private static void optionError(String msg, String option) {

        System.out.println(msg + option);

        System.out.println();

        showHelp();

        System.exit(1);

    }

}