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package com.github.bordertech.wcomponents.examples;

import com.github.bordertech.wcomponents.Action;
import com.github.bordertech.wcomponents.ActionEvent;
import com.github.bordertech.wcomponents.Message;
import com.github.bordertech.wcomponents.Request;
import com.github.bordertech.wcomponents.WApplication;
import com.github.bordertech.wcomponents.WButton;
import com.github.bordertech.wcomponents.WContainer;
import com.github.bordertech.wcomponents.WHeading;
import com.github.bordertech.wcomponents.WLink;
import com.github.bordertech.wcomponents.WMessages;
import com.github.bordertech.wcomponents.WPanel;
import com.github.bordertech.wcomponents.WText;
import com.github.bordertech.wcomponents.layout.FlowLayout;
import com.github.bordertech.wcomponents.layout.FlowLayout.Alignment;

/**
 * Demonstrate how to use {@link WApplication} and the unsavedChanges feature.
 *
 * @author Jonathan Austin
 * @since 1.0.0
 */
public class WApplicationExample extends WContainer {

	/**
	 * Text message.
	 */
	private final WText msg = new WText();

	/**
	 * Information Messages.
	 */
	private final WMessages messages = new WMessages();

	/**
	 * Create WApplicationExample.
	 */
	public WApplicationExample() {

		WPanel root = new WPanel();
		root.setLayout(new FlowLayout(Alignment.VERTICAL));

		root.add(messages);

		root.add(new WHeading(1, "Display unsaved changes warning message"));
		root.add(msg);

		// Setup Links to navigate away from page
		WLink link1 = new WLink("lets go to google in a new window", "http://www.google.com");
		root.add(link1);
		WLink link2 = new WLink("lets go to google in the same window", "http://www.google.com");
		link2.setOpenNewWindow(false);
		root.add(link2);

		// Setup buttons to set/reset the unsavedChanges flag
		WPanel buttonPanel = new WPanel();
		buttonPanel.setLayout(new FlowLayout(Alignment.LEFT));
		WButton changed = new WButton("set changed");
		changed.setAction(new Action() {
			@Override
			public void execute(final ActionEvent event) {
				WApplication appl = findApplication();

				if (appl != null) {
					appl.setUnsavedChanges(true);
				}
			}
		});
		WButton clear = new WButton("clear changed");
		clear.setAction(new Action() {
			@Override
			public void execute(final ActionEvent event) {
				WApplication appl = findApplication();

				if (appl != null) {
					appl.setUnsavedChanges(false);
				}
			}
		});
		buttonPanel.add(changed);
		buttonPanel.add(clear);

		root.add(buttonPanel);
		add(root);
	}

	/**
	 * @param request the request being processed
	 */
	@Override
	protected void preparePaintComponent(final Request request) {
		WApplication appl = findApplication();

		if (appl != null) {
			msg.setText("Unsaved changes: " + (appl.hasUnsavedChanges() ? "Yes" : "No"));
		}
	}

	/**
	 * Find the closest WApplication instance.
	 *
	 * @return the closest WApplication instance
	 */
	private WApplication findApplication() {
		WApplication appl = WApplication.instance(this);

		if (appl == null) {
			messages.addMessage(new Message(Message.WARNING_MESSAGE,
					"There is no WApplication available for this example."));
		}

		return appl;
	}

}