package org.litesoft.GWT.client.iconservice;

import java.util.*;

import org.litesoft.GWT.client.taskbar.*;

public class FavoritesManager
{
    public static final FavoritesManager INSTANCE = new FavoritesManager();

    private List mFavorites = new ArrayList();
    public static final TaskbarFavoriteEntry[] EMPTY_ARRAY = new TaskbarFavoriteEntry[0];
    private TaskbarHelper mTaskbarHelper;

    private FavoritesManager()
    {
    }

    public void addToFavorites( PersistentTaskbarFavoritePackage pFavorite )
    {
        if ( mTaskbarHelper != null )
        {
            mFavorites.add( new TaskbarFavoriteEntry( pFavorite.getFactoryRef() ) );

            mTaskbarHelper.updateFavoritesDisplay( mFavorites );
        }
    }

    public void removeFavorite( TaskbarItem pItem )
    {
        TaskbarEntry taskbarEntry = pItem.getEntry();

        int indx = mFavorites.indexOf( taskbarEntry );

        if ( indx >= 0 )
        {
            mFavorites.remove( indx );
            mTaskbarHelper.updateFavoritesDisplay( mFavorites );
        }
    }

    public void moveFavoriteUp( TaskbarItem pItem )
    {
        TaskbarEntry taskbarEntry = pItem.getEntry();

        if ( taskbarEntry != null )
        {
            int currentIndex = mFavorites.indexOf( taskbarEntry );

            Object o = mFavorites.remove( currentIndex );

            if ( (currentIndex - 1) < 0 )
            {
                currentIndex = 0;
            }
            else
            {
                currentIndex--;
            }

            mFavorites.add( currentIndex, o );
            mTaskbarHelper.updateFavoritesDisplay( mFavorites );
        }
    }

    public void moveFavoriteDown( TaskbarItem pItem )
    {
        TaskbarEntry taskbarEntry = pItem.getEntry();

        if ( taskbarEntry != null )
        {

            int currentIndex = mFavorites.indexOf( taskbarEntry );
            int totalFavorites = mFavorites.size();
            Object o = mFavorites.remove( currentIndex );

            if ( (currentIndex + 1) >= totalFavorites )
            {
                currentIndex = totalFavorites - 1;
            }
            else
            {
                currentIndex++;
            }

            mFavorites.add( currentIndex, o );
            mTaskbarHelper.updateFavoritesDisplay( mFavorites );
        }
    }

    public TaskbarFavoriteEntry[] getFavoritesForDisplay()
    {
        return toArray( mFavorites );
    }

    private TaskbarFavoriteEntry[] toArray( List pFavorites )
    {
        if ( pFavorites.isEmpty() )
        {
            return FavoritesManager.EMPTY_ARRAY;
        }
        TaskbarFavoriteEntry[] rv = new TaskbarFavoriteEntry[pFavorites.size()];
        for ( int i = 0; i < pFavorites.size(); i++ )
        {
            rv[i] = (TaskbarFavoriteEntry) pFavorites.get( i );
        }
        return rv;
    }

    public void setTaskbarHelper( TaskbarHelper pTaskbarHelper )
    {
        mTaskbarHelper = pTaskbarHelper;
    }
}