/**
 * The contents of this file are subject to the license and copyright
 * detailed in the LICENSE and NOTICE files at the root of the source
 * tree and available online at
 *
 * http://www.dspace.org/license/
 */

package org.dspace.app.util;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.DefaultParser;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;
import org.dspace.services.ConfigurationService;
import org.dspace.services.factory.DSpaceServicesFactory;

/**
 * Configuration tools.
 *
 * @author mwood
 */
public class Configuration
{
    /**
     * Command-line interface for running configuration tasks. Possible
     * arguments:
     * <ul>
     * <li>{@code --module name} the name of the configuration "module" for this property.</li>
     * <li>{@code --property name} prints the value of the DSpace configuration
     * property {@code name} to the standard output.</li>
     * <li>{@code --raw} suppresses parameter substitution in the output.</li>
     * <li>{@code --help} describes these options.</li>
     * </ul>
     * If the property does not exist, nothing is written.
     *
     * @param argv
     *            command-line arguments
     */
    public static void main(String[] argv)
    {
        // Build a description of the command line
        Options options = new Options();
        options.addOption("p", "property", true, "name of the desired property");
        options.addOption("m", "module", true,
                "optional name of the module in which 'property' exists");
        options.addOption("r", "raw", false,
                "do not do property substitution on the value");
        options.addOption("?", "Get help");
        options.addOption("h", "help", false, "Get help");

        // Analyze the command line
        CommandLineParser parser = new DefaultParser();
        CommandLine cmd = null;
        try
        {
            cmd = parser.parse(options, argv);
        } catch (ParseException ex)
        {
            System.err.println(ex.getMessage());
            System.exit(1);
        }

        // Give help if asked
        if (cmd.hasOption('?') || cmd.hasOption('h'))
        {
            new HelpFormatter().printHelp("dsprop [options]",
                    "Display the value of a DSpace configuration property",
                    options,
                    "If --module is omitted, then --property gives the entire" +
                    " name of the property.  Otherwise the name is" +
                    " composed of module.property.");
            System.exit(0);
        }

        // Check for missing required values
        if (!cmd.hasOption('p'))
        {
            System.err.println("Error:  -p is required");
            System.exit(1);
        }

        // Figure out the property's full name
        StringBuilder propNameBuilder = new StringBuilder(1024);
        if (cmd.hasOption('m'))
        {
            propNameBuilder.append(cmd.getOptionValue('m'))
                    .append('.');
        }
        propNameBuilder.append(cmd.getOptionValue('p'));
        String propName = propNameBuilder.toString();

        // Print the property's value, if it exists
        ConfigurationService cfg = DSpaceServicesFactory.getInstance().getConfigurationService();
        if (!cfg.hasProperty(propName))
        {
            System.out.println();
        }
        else
        {
            String val;
            if (cmd.hasOption('r'))
            {
                val = cfg.getPropertyValue(propName).toString();
            }
            else
            {
                val = cfg.getProperty(propName);
            }
            System.out.println(val);
        }
        System.exit(0);
    }
}