package net.curisit.securis;

import java.io.File;
import java.net.URISyntaxException;

import net.curisit.securis.beans.SignedLicenseBean;
import net.curisit.securis.utils.Params;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.OptionBuilder;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;
import org.apache.commons.cli.PosixParser;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

/**
 * Main class when SeCuris client is used from command line.
 * 
 * <pre>
 * usage: securis-client [-c] [-g] [-h] [-l <lic_file>] [-r <lic_file>] [-s
 *       <url_license_server>] [-t]
 * -c,--create                        Request a license file from server.
 *                                    --rfile and --server parameters are
 *                                    mandatory.
 * -g,--gen_request                   Generate request file. If --rfile
 *                                     parameter is missing then It is
 *                                     generated in current directory.
 *  -h,--help                          Show help.
 *  -l,--validate <lic_file>           Validate lic file.
 *  -r,--renew <lic_file>              Synchronize/renew the current license
 *                                     file. --server parameter is mandatory.
 *  -s,--server <url_license_server>   License server url.
 *  -t,--test_lc                       Test if License Server (LC) is
 * </pre>
 * 
 * @author roberto <roberto.sanchez@curisit.net>
 * 
 */
public class License {

    private static final Logger LOG = LogManager.getLogger(License.class);

    /**
     * Aplication entry point when it used as CLI
     * 
     * @param args
     * @throws URISyntaxException
     */
    public static void main(String[] args) throws URISyntaxException {

        LOG.debug("SeCuris client tool init ");

        checkConfigFile();
        CommandLine cmd = getCommandLine(args);

        try {
            if (cmd.hasOption('g')) {
                String filename = cmd.getOptionValue("rfile");
                if (filename == null)
                    filename = "./license.req";
                File file = new File(filename);
                LicenseManager.getInstance().createRequestFile(file);
                LOG.info("Request file {} generated OK", file.getAbsolutePath());
                System.exit(0);
            }

            if (cmd.hasOption('l')) {
                String filename = cmd.getOptionValue("validate");
                if (filename == null)
                    filename = "./license.lic";
                File file = new File(filename);
                if (!file.exists()) {
                    throw new SeCurisException("The license file doesn't exist: " + file.getAbsolutePath());
                }
                try {
                    LicenseManager.getInstance().validateLicense(file);
                    LOG.info("License file {} is valid", file.getAbsolutePath());
                } catch (SeCurisException e) {
                    LOG.info("License file {} is NOT valid", file.getAbsolutePath());
                    LOG.info("Reason: {}", e.toString());
                }

                System.exit(0);
            }

            if (cmd.hasOption('c')) {
                SignedLicenseBean lic = LicenseManager.getInstance().requestLicense();
                String filename = cmd.getOptionValue("c");
                if (filename == null)
                    filename = "./license.lic";
                File file = new File(filename);
                LicenseManager.getInstance().save(lic, file);
                LOG.info("License file sucessfully saved in file: {}", file.getAbsolutePath());
                System.exit(0);
            }

            if (cmd.hasOption('t')) {
                LicenseManager.getInstance().testServer();
                LOG.info("Server is OK, url: {}", Params.get(Params.KEYS.LICENSE_SERVER_URL, Params.DEFAUT_SERVER_URL));

                System.exit(0);
            }

            if (cmd.hasOption('r')) {
                String licFilename = cmd.getOptionValue("renew");
                checkMandatoryParameter(licFilename, "renew");
                File file = new File(licFilename);
                if (!file.exists()) {
                    throw new SeCurisException("The license file doesn't exist: " + file.getAbsolutePath());
                }
                SignedLicenseBean newLic = LicenseManager.getInstance().renew(file);
                File oldLicFile = new File(file.getAbsoluteFile() + ".old");
                file.renameTo(oldLicFile);
                LOG.info("Old license file has been renamed to: {}", oldLicFile.getAbsolutePath());
                LicenseManager.getInstance().save(newLic, file);
                LOG.info("New license file saved as: {}", file.getAbsolutePath());
                System.exit(0);
            }

        } catch (SeCurisException e) {
            LOG.error("The command generated an error: {}", e.toString());
        }
    }

    private static void checkMandatoryParameter(String value, String param) {
        if (value == null) {
            LOG.error("Parameter {} is mandatory. Use --help to get information about parameters", param);
            System.exit(-5);
        }
    }

    /**
     * Checks that config file exists and contains mandatory parameters
     */
    private static void checkConfigFile() {
        if (Params.get(Params.KEYS.APPLICATION_CODE) == null) {
            LOG.error("Manadatory parameter {} is not set in config file", Params.KEYS.APPLICATION_CODE);
            System.exit(-3);
        }
        if (Params.get(Params.KEYS.CUSTOMER_CODE) == null) {
            LOG.error("Manadatory parameter {} is not set in config file", Params.KEYS.CUSTOMER_CODE);
            System.exit(-4);
        }
        if (Params.get(Params.KEYS.PACK_CODE) == null) {
            LOG.error("Manadatory parameter {} is not set in config file", Params.KEYS.PACK_CODE);
            System.exit(-6);
        }
    }

    private static CommandLine getCommandLine(String[] args) {
        Options ops = prepareOptionCLI();
        if (args.length == 0) {
            printHelp(ops);
        }
        CommandLineParser parser = new PosixParser();
        CommandLine cmd = null;
        try {
            cmd = parser.parse(ops, args);
        } catch (ParseException e) {
            printHelp(ops);
        }

        if (cmd.hasOption('h')) {
            printHelp(ops);
        }

        return cmd;
    }

    private static void printHelp(Options ops) {
        HelpFormatter formatter = new HelpFormatter();
        formatter.printHelp("securis-client", ops, true);
        System.exit(-1);
    }

    @SuppressWarnings("static-access")
    private static Options prepareOptionCLI() {
        Options options = new Options();

        options.addOption("h", "help", false, "Show help.");
        options.addOption(OptionBuilder.withArgName("req_file").withLongOpt("rfile")
                .withDescription("Set request file for its generation or for license requesting.").hasArg(true).create('r'));
        // options.addOption(OptionBuilder.withArgName("url_license_server").withLongOpt("server").withDescription("License server url.").hasArg(true).create('s'));
        options.addOption(OptionBuilder.withArgName("lic_file").withLongOpt("validate").withDescription("Validate lic file.").hasArg(true)
                .create('l'));

        options.addOption("g", "gen_request", false,
                "Generate request file. If --rfile parameter is missing then It is generated in current directory.");
        options.addOption(OptionBuilder.withArgName("lic_file").withLongOpt("create").withDescription("Request a license file to server.")
                .hasArg(true).hasOptionalArg().create('c'));
        options.addOption("t", "test_lc", false, "Test if License Server (LC) is available. ");
        options.addOption(OptionBuilder.withArgName("lic_file").withLongOpt("renew").withDescription("Synchronize/renew the current license file.")
                .hasArg(true).create('r'));

        return options;
    }
}