package org.openslx.dozmod.gui.helper;

import java.awt.Component;
import java.util.Date;

import javax.swing.Box;
import javax.swing.DefaultBoundedRangeModel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

import org.apache.log4j.Logger;
import org.openslx.dozmod.gui.control.QLabel;
import org.openslx.dozmod.thrift.Session;
import org.openslx.dozmod.util.FormatHelper;

public class ExpiryDateChooser {

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

	/**
	 * Helper to ask the user for the number of days to extend a date with. If
	 * startingDate is given, it will preview the starting date + selected
	 * number of days. If startingDate is null, no preview will be done.
	 * Returns the numbers of days selected.
	 *
	 * @param parent component to center the dialog on.
	 * @param starting date to add the user selected duration on to. Only needed
	 *            for live preview of the future date.
	 * @return the number of days the user selected.
	 */
	public static int askFutureExpiryDuration(final Component parent, final Date startingDate) {

		ExpiryDateChooserWindow win = new ExpiryDateChooserWindow(parent);
		int ret = win.query(startingDate);
		if (ret <= 0
				|| ret > Session.getSatelliteConfig().maxImageValidityDays) {
			LOGGER.error("Invalid date returned after asking user extension duration: "
					+ ret);
			return -1;
		}
		return ret;
	}
}

/**
 * Internal layout class.
 */
class ExpiryDateChooserWindow extends JPanel {

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

	public static final int DEFAULT_EXTENSION_DURATION = 14;

	private final JPanel pane = new JPanel();
	private final GridManager grdPane = new GridManager(pane, 3, true);
	private final JSlider sldDaysToExtend = new JSlider(JSlider.HORIZONTAL);
	private final QLabel lblNewDate = new QLabel();
	private final QLabel lblNewDateLabel = new QLabel("Neues Ablaufdatum: ");
	private final Component parent;
	public ExpiryDateChooserWindow(final Component parent) {
		this.parent = parent;
		grdPane.add(new QLabel("Geben Sie ein um wieviele Tage diese Version(en) verlängert werden soll:"), 3)
				.fill(true, true)
				.expand(true, true);
		grdPane.nextRow();
		sldDaysToExtend.setModel(new DefaultBoundedRangeModel(DEFAULT_EXTENSION_DURATION, 0, 1,
				Session.getSatelliteConfig().maxImageValidityDays));
		grdPane.add(sldDaysToExtend, 3).fill(true, false).expand(true, false);
		grdPane.nextRow();
		grdPane.add(lblNewDateLabel);
		grdPane.add(Box.createGlue()).fill(true, false).expand(true, false);
		grdPane.add(lblNewDate).fill(true, true).expand(true, true);
		grdPane.finish(true);
	}

	public int query(final Date startingDate) {
		// show bottom date preview if only one version was selected
		lblNewDate.setText(startingDate == null ? ""
				: FormatHelper.longDate(
						DateTimeHelper.addDaysTo(startingDate, DEFAULT_EXTENSION_DURATION)));
		sldDaysToExtend.addChangeListener(new ChangeListener() {
			@Override
			public void stateChanged(ChangeEvent e) {
				if (startingDate == null)
					return;
				Date current = DateTimeHelper.addDaysTo(startingDate, sldDaysToExtend.getValue());
				lblNewDate.setText(FormatHelper.longDate(current));
			}
		});
		sldDaysToExtend.setValue(DEFAULT_EXTENSION_DURATION);
		int ret = JOptionPane.showConfirmDialog(parent, pane, "Ablaufdatum verlängern",
				JOptionPane.OK_CANCEL_OPTION);
		if (ret != 0)
			return -1;
		return sldDaysToExtend.getValue();
	}
}