package de.intevation.flys.client.client.ui;

import com.google.gwt.core.client.GWT;

import com.smartgwt.client.widgets.Button;
import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.Label;
import com.smartgwt.client.widgets.events.ClickEvent;
import com.smartgwt.client.widgets.events.ClickHandler;
import com.smartgwt.client.widgets.layout.HLayout;

import de.intevation.flys.client.client.FLYS;
import de.intevation.flys.client.client.FLYSMessages;
import de.intevation.flys.client.shared.model.User;


/**
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class MainMenu extends HLayout {

    /** The interface that provides i18n messages. */
    private FLYSMessages messages = GWT.create(FLYSMessages.class);

    /** An instance to FLYS.*/
    protected FLYS flys;

    /** The user that is currently logged in. */
    protected User currentUser;

    /** The label that displays the current logged in user. */
    protected Label userText;

    /** The label that displays the title of the application. */
    protected Label titleText;

    /** The button to add new projects.*/
    protected Button newCollection;

    /**
     * The default constructor for creating a new MainMenu.
     */
    public MainMenu(FLYS flys) {
        this.flys     = flys;

        userText      = new Label(messages.user(messages.guest()));
        titleText     = new Label(messages.title());
        newCollection = new Button(messages.new_project());

        newCollection.addClickHandler(new ClickHandler() {
            public void onClick(ClickEvent event) {
                GWT.log("Clicked 'New Project' button.");
                createNewProject();
            }
        });

        init();
    }


    /**
     * This method is called by the constructor after creating the necessary
     * components. It initializes layout specific stuff like width, height,
     * colors and so on and appends the components.
     */
    protected void init() {
        setWidth100();
        setHeight("40px");
        setBorder("1px solid #808080");
        setBackgroundColor("#C3D9FF");
        setLayoutMargin(10);

        titleText.setWidth("7%");

        Canvas buttonWrapper = new Canvas();
        buttonWrapper.setWidth("*");
        buttonWrapper.addChild(newCollection);

        userText.setWidth("20%");

        addMember(titleText);
        addMember(buttonWrapper);
        addMember(userText);
    }


    /**
     * Set the current {@link User} and call {@link updateCurrentUser()}
     * afterwards.
     *
     * @param user the new user.
     */
    public void setCurrentUser(User currentUser) {
        this.currentUser = currentUser;

        updateCurrentUser();
    }


    /**
     * Update the text field that shows the current user. If no user is
     * currently logged in, the text will display {@link FLYSMessages.guest()}.
     */
    public void updateCurrentUser() {
        String name = currentUser != null
            ? currentUser.getName()
            : messages.guest();

        GWT.log("Update the current user: " + name);
        userText.setContents(messages.user(name));
    }


    /**
     * Create a new project by calling FLYS.newProject().
     */
    protected void createNewProject() {
        flys.newProject();
    }
}
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