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/*
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */

package ai.preferred.regression;

import org.kohsuke.args4j.CmdLineException;
import org.kohsuke.args4j.CmdLineParser;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public abstract class Command {

  private static final Logger LOGGER = LoggerFactory.getLogger(Command.class);

  protected abstract void exec() throws Exception;

  protected static void parseArgsAndRun(final Class clazz, final String[] args) {
    Command command = null;
    try {
      command = clazz.newInstance();
    } catch (IllegalAccessException | InstantiationException e) {
      System.err.println("Please check if there is the public default constructor for the class: "
          + clazz.getCanonicalName());
      System.exit(1);
    }

    if (args == null) {
      System.out.println("=========== HELP ===========");
      System.out.println();
      System.out.println("Processing Element: " + clazz.getSimpleName() + ".class");
      System.out.println();
      System.out.println("Shell.run(" + clazz.getSimpleName() + ".class, \"\");");
      final CmdLineParser parser = new CmdLineParser(command);
      System.out.println();
      parser.printUsage(System.out);
      System.out.println();
      System.out.println("============================");
      System.out.println();
      System.out.println();
      return;
    }

    final CmdLineParser parser = new CmdLineParser(command);
    try {
      parser.parseArgument(args);
    } catch (CmdLineException e) {
      System.err.println("Command: " + clazz.getCanonicalName());
      System.err.println(e.getMessage());
      System.err.println();
      parser.printUsage(System.err);
      System.exit(1);
    }

    try {
      command.exec();
    } catch (Exception e) {
      LOGGER.error("Unable to execute command (" + clazz.getCanonicalName() + "): ", e);
      System.exit(1);
    }
  }

}