// This Source Code is in the Public Domain per: http://unlicense.org
package org.litesoft.GWT.client;

import org.litesoft.commonfoundation.base.*;
import org.litesoft.commonfoundation.typeutils.*;

import java.util.*;

public class StatusBar {
    private static Stack<String> sMessages = new Stack<String>();

    public static void remove( String pText ) {
        if ( (pText != null) && sMessages.remove( pText ) ) {
            refresh();
        }
    }

    public static void add( String pText ) {
        if ( pText != null ) {
            if ( sMessages.isEmpty() ) {
                sMessages.push( pText );
            } else if ( !pText.equals( sMessages.peek() ) ) {
                sMessages.remove( pText );
                sMessages.push( pText );
            }
            refresh();
        }
    }

    public static void refresh() {
        set( sMessages.isEmpty() ? " " : sMessages.peek() );
    }

    public static void prepend( String pText, String pSep ) {
        if ( pText != null ) {
            String zExistingText = ConstrainTo.significantOrNull( get() );
            if ( zExistingText != null ) {
                pText = Strings.trimToLength( ConstrainTo.notNull( pSep ) + zExistingText, 80, "..." );
            }
            set( pText );
        }
    }

    public static native void set( String pText )/*-{
        $wnd.status = pText;
    }-*/;

    public static native String get()/*-{
        return $wnd.status;
    }-*/;
}