package de.ugoe.cs.quest.ui;

import java.io.File;
import java.io.IOException;
import java.util.List;

import joptsimple.OptionException;
import joptsimple.OptionParser;
import joptsimple.OptionSet;
import joptsimple.OptionSpec;
import de.ugoe.cs.quest.log4j.Log4JLogger;
import de.ugoe.cs.quest.plugin.PluginLoader;
import de.ugoe.cs.quest.plugin.QuestPlugin;
import de.ugoe.cs.quest.ui.swt.MainWindow;
import de.ugoe.cs.util.console.CommandExecuter;
import de.ugoe.cs.util.console.Console;
import de.ugoe.cs.util.console.TextConsole;

/**
 * <p>
 * Start-up class of the application.
 * </p>
 * <p>
 * It sets up and starts the {@link Console}.
 * </p>
 * 
 * @author Steffen Herbold
 * @version 1.0
 */
public class Runner {

    public enum UITYPE {
        text, swt
    };

    public enum LOG4JTYPE {
        enable, disable
    }

    /**
     * <p>
     * Main method of the application.
     * </p>
     * 
     * @param args
     *            if parameters are defined, they are interpreted as commands for the
     *            {@link Console} and executed before the user can use the console; can be used to
     *            perform batch operations
     */
    public static void main(String[] args) {

        CommandExecuter.getInstance().addCommandPackage("de.ugoe.cs.quest.ui.commands");
        CommandExecuter.getInstance().addCommandPackage("de.ugoe.cs.quest.ui.swt.commands");

        // The following four command packages are added automatically, once the
        // plugin-mechanism works correctly. Hence, these calls should be
        // removed then.
        /*
         * CommandExecuter.getInstance().addCommandPackage( "de.ugoe.cs.quest.plugin.mfc.commands");
         * CommandExecuter.getInstance().addCommandPackage( "de.ugoe.cs.quest.plugin.php.commands");
         * CommandExecuter.getInstance().addCommandPackage(
         * "de.ugoe.cs.quest.plugin.guitar.commands");
         * CommandExecuter.getInstance().addCommandPackage( "de.ugoe.cs.quest.plugin.jfc.commands");
         */

        PluginLoader pluginLoader = new PluginLoader(new File("lib"));
        pluginLoader.load();

        for (QuestPlugin plugin : pluginLoader.getPlugins()) {
            for (String commandPackage : plugin.getCommandPackages()) {
                CommandExecuter.getInstance().addCommandPackage(commandPackage);
            }
        }

        OptionParser parser = new OptionParser();
        OptionSpec<LOG4JTYPE> log4j =
            parser.accepts("log4j", "Allowed values: enable, disable").withRequiredArg()
                .ofType(LOG4JTYPE.class).defaultsTo(LOG4JTYPE.enable);
        OptionSpec<UITYPE> ui =
            parser.accepts("ui", "Allowed values: text, swt").withRequiredArg()
                .ofType(UITYPE.class).defaultsTo(UITYPE.text);
        OptionSpec<LOG4JTYPE> trace =
            parser.accepts("trace", "Allowed values: enable, disable").withRequiredArg()
                .ofType(LOG4JTYPE.class).defaultsTo(LOG4JTYPE.enable);
        OptionSet options = parser.parse(args);

        List<String> startupCommands = options.nonOptionArguments();
        try {
            switch (options.valueOf(log4j))
            {
                case enable:
                    new Log4JLogger();
                    break;
                case disable:
                    // do nothing
                    break;
                default:
                    throw new AssertionError("reached source code that should be unreachable");
            }

            switch (options.valueOf(ui))
            {
                case text:
                    TextConsole textConsole = new TextConsole();
                    if (options.valueOf(trace) == LOG4JTYPE.disable) {
                        textConsole.setDebug(false);
                    }
                    for (String command : startupCommands) {
                        CommandExecuter.getInstance().exec(command);
                    }
                    textConsole.run(true);
                    break;
                case swt:
                    MainWindow mainWindow = new MainWindow(startupCommands);
                    mainWindow.open();
                    break;
                default:
                    throw new AssertionError("reached source code that should be unreachable");
            }
        }
        catch (OptionException e) {
            System.err.println("Invalid Parameters: " + e.getMessage());
            try {
                parser.printHelpOn(System.out);
            }
            catch (IOException e1) {
                // ignore exception.
            }
        }
    }

}