package com.itmill.toolkit.demo;

//
// Millstone imports were replaced
//
// import org.millstone.base.Application;
// import org.millstone.base.ui.*;
// import org.millstone.base.data.*;
//
import com.itmill.toolkit.Application;
import com.itmill.toolkit.data.Property;
import com.itmill.toolkit.ui.*;

/**
 * <p>
 * Example application demonstrating simple user login. This example is from
 * MillStone 3.1.1 examples section. Upgrading from 3.1.1 to 4.0.0 was done by
 * updating imports, also setTheme("corporate") call was added to application
 * init method.
 * </p>
 * 
 * @since 3.1.1
 * @author IT Mill Ltd.
 */
public class UpgradingSample extends Application implements
		Property.ValueChangeListener {

	/* Menu for navigating inside the application. */
	private Tree menu = new Tree();

	/* Contents of the website */
	private String[][] pages = { { "Welcome", "Welcome to our website..." },
			{ "Products", "Public product information." },
			{ "Contact", "Public contact information." },
			{ "CRM", "CRM Database requiring login." },
			{ "Intranet", "Internal information database." } };

	/* Application layout */
	private GridLayout layout = new GridLayout(2, 1);

	/* Initialize the application */
	public void init() {

		// Create the main window of the application
		Window main = new Window("Login example", layout);
		setMainWindow(main);

		// Add menu and loginbox to the application
		OrderedLayout l = new OrderedLayout();
		layout.addComponent(l, 0, 0);
		l.addComponent(menu);
		l.addComponent(new LoginBox());

		// Setup menu
		menu.setStyle("menu");
		menu.addListener(this);
		menu.setImmediate(true);
		addToMenu(new String[] { "Welcome", "Products", "Contact" });
	}

	// Overriding usetUser method is a simple way of updating application
	// privileges when the user is changed
	public void setUser(Object user) {
		super.setUser(user);
		if (user != null)
			addToMenu(new String[] { "CRM", "Intranet" });
	}

	public void addToMenu(String[] items) {
		for (int i = 0; i < items.length; i++) {
			menu.addItem(items[i]);
			menu.setChildrenAllowed(items[i], false);
		}
		if (menu.getValue() == null)
			menu.setValue(items[0]);
	}

	// Handle menu selection and update visible page
	public void valueChange(Property.ValueChangeEvent event) {
		layout.removeComponent(1, 0);
		String title = (String) menu.getValue();
		for (int i = 0; i < pages.length; i++)
			if (pages[i][0].equals(title)) {
				Panel p = new Panel(pages[i][0]);
				p.addComponent(new Label(pages[i][1]));
				p.setStyle("strong");
				layout.addComponent(p, 1, 0);
			}
	}

	// Simple loginbox component for the application
	public class LoginBox extends CustomComponent implements
			Application.UserChangeListener {

		// The components this loginbox is composed of
		private TextField loginName = new TextField("Name");

		private Button loginButton = new Button("Enter", this, "login");

		private Panel loginPanel = new Panel("Login");

		private Panel statusPanel = new Panel();

		private Button logoutButton = new Button("Logout",
				UpgradingSample.this, "close");

		private Label statusLabel = new Label();

		// Initialize login component
		public LoginBox() {

			// Initialize the component
			loginPanel.addComponent(loginName);
			loginPanel.addComponent(loginButton);
			loginPanel.setStyle("strong");
			loginName.setColumns(8);
			statusPanel.addComponent(statusLabel);
			statusPanel.addComponent(logoutButton);

			// Set the status of the loginbox and show correct components
			updateStatus();

			// Listen application user change events
			UpgradingSample.this.addListener(this);
		}

		// Login into application
		public void login() {
			String name = (String) loginName.getValue();
			if (name != null && name.length() > 0)
				setUser(name);
			loginName.setValue("");
		}

		// Update login status on application user change events
		public void applicationUserChanged(Application.UserChangeEvent event) {
			updateStatus();
		}

		// Update login status of the component by exposing correct components
		private void updateStatus() {
			statusLabel.setValue("User: " + getUser());
			if (getUser() != null)
				setCompositionRoot(statusPanel);
			else
				setCompositionRoot(loginPanel);
		}
	}
}