package org.openslx.dozmod.gui.control;

import java.awt.Insets;
import java.util.EventListener;
import java.util.EventObject;

import javax.swing.BorderFactory;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.event.EventListenerList;

import org.openslx.dozmod.gui.helper.GridManager;
import org.openslx.dozmod.gui.helper.TextChangeListener;

/**
 * Widget for advanced configuration options for lectures. This handles
 * following options - Network rules - Runscript - USB
 */
public class RunscriptConfigurator extends RunscriptConfiguratorLayout {

	private static final long serialVersionUID = -3497629601818983994L;
	private String originalRunScript = null;

	public RunscriptConfigurator() {
		super();

		final TextChangeListener docListener = new TextChangeListener() {
			@Override
			public void changed() {
				fireRunscriptConfigurationChangeEvent(new RunscriptConfigurationChangeEvent(
						new Object()));
			}
		};
		taRunScript.getDocument().addDocumentListener(docListener);

	}

	public boolean hasChanged() {
		return !originalRunScript.equalsIgnoreCase(taRunScript.getText());
	}

	/**
	 * Gets the runscript as String.
	 * 
	 * @return runscript as String. If not text was entered, returns a empty string.
	 */
	public String getState() {
		String input = taRunScript.getText();
		return input != null ? input : "";
	}

	/**
	 * Sets the state of this widget to the given AdvancedConfiguration. Basicly
	 * this sets the content of the text areas to the corresponding network
	 * rules/runscript as given by the AdvancedConfiguration object
	 * 
	 * @param config
	 *            AdvancedConfiguration to set the state to
	 */
	public void setState(final String config) {
		this.taRunScript.setText(config != null ? config : "" );
	}


	/**
	 * Custom event mechanism to detect changes to the user list (Mostly needed
	 * for the reactToChange() stuff in LectureDetailsWindow)
	 */
	protected EventListenerList listenerList = new EventListenerList();

	public class RunscriptConfigurationChangeEvent extends EventObject {

		private static final long serialVersionUID = -8779550754760035845L;

		public RunscriptConfigurationChangeEvent(Object source) {
			super(source);
		}
	}

	public interface RunscriptConfigurationChangeEventListener extends
			EventListener {
		public void stateChanged(RunscriptConfigurationChangeEvent event);
	}

	public void addRunscriptConfigurationChangeEventListener(
			RunscriptConfigurationChangeEventListener listener) {
		listenerList.add(RunscriptConfigurationChangeEventListener.class,
				listener);
	}

	public void removeRunscriptConfigurationChangeEventListener(
			RunscriptConfigurationChangeEventListener listener) {
		listenerList.remove(RunscriptConfigurationChangeEventListener.class,
				listener);
	}

	void fireRunscriptConfigurationChangeEvent(
			RunscriptConfigurationChangeEvent evt) {
		Object[] listeners = listenerList.getListenerList();
		for (int i = 0; i < listeners.length; i++) {
			if (listeners[i] == RunscriptConfigurationChangeEventListener.class) {
				((RunscriptConfigurationChangeEventListener) listeners[i + 1])
						.stateChanged(evt);
			}
		}
	}
}

/**
 * Internal layout class for the advanced configurator (to keep it clean even
 * for widgets)
 */
class RunscriptConfiguratorLayout extends JPanel {

	private static final long serialVersionUID = 648729071828404053L;

	private final static String txtRunScriptTitle = "Startskript";
	private final static String txtRunScriptDesc = "Ein hier eingetragenes Skript wird nach dem Start dieser VM automatisch ausgeführt.";

	private final JPanel pnlRunScript;
	protected final JTextArea taRunScript;

	public RunscriptConfiguratorLayout() {

		GridManager grid = new GridManager(this, 1, true,
				new Insets(5, 5, 5, 5));

		// middle panel for the run script textpane
		pnlRunScript = new JPanel();
		GridManager gridRunScript = new GridManager(pnlRunScript, 1, true,
				new Insets(2, 2, 2, 2));
		taRunScript = new JTextArea("", 5, 20);
		taRunScript.setLineWrap(true);
		taRunScript.setWrapStyleWord(true);
		JScrollPane scpRunScript = new JScrollPane(taRunScript,
				JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
				JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
		pnlRunScript.setBorder(BorderFactory
				.createTitledBorder(txtRunScriptTitle));
		gridRunScript
				.add(new WordWrapLabel(txtRunScriptDesc, false, true))
				.fill(true, false).expand(true, false);
		gridRunScript.nextRow();
		// TODO add checkbox for script's interpreter type: sh, bash, powershell...
		
		gridRunScript.add(scpRunScript).fill(true, true).expand(true, true);
		gridRunScript.finish(false);

		// build the final grid
		grid.add(pnlRunScript).fill(true, true).expand(true, true);
		grid.finish(false);
	}
}