/*
 * Copyright (C) 2013 Azureus Software, Inc. All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 */

package com.biglybt.ui.swt.columns.tag;

import com.biglybt.pif.ui.tables.*;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

import com.biglybt.core.tag.Tag;

public class ColumnTagDependsOn
	implements TableCellRefreshListener, TableColumnExtraInfoListener
{
	public static String COLUMN_ID = "tag.dependson";

	@Override
	public void fillTableColumnInfo(TableColumnInfo info) {
		info.addCategories(new String[] {
			TableColumn.CAT_ESSENTIAL,
		});
		info.setProficiency(TableColumnInfo.PROFICIENCY_BEGINNER);
	}

	/** Default Constructor */
	public ColumnTagDependsOn(TableColumn column) {
		column.setWidth(160);
		column.addListeners(this);
	}

	@Override
	public void refresh(TableCell cell) {
		Tag tag = (Tag) cell.getDataSource();
		
		String str = null;
		if (tag != null) {
			List<Tag> tags = tag.dependsOnTags();
						
			if ( tags != null ){
				
				StringBuilder sb = new StringBuilder( 256 );
				
				Set<Tag> path = new HashSet<>();
				
				path.add( tag );
				
				explode( sb, path, tags );
				
				str = sb.toString();
			}else{
				str = "";
			}
		}

		if (!cell.setSortValue(str) && cell.isValid()) {
			return;
		}

		if (!cell.isShown()) {
			return;
		}

		cell.setText(str);
	}
	
	private void
	explode(
		StringBuilder	sb,
		Set<Tag>		path,
		List<Tag>		tags )
	{
		String	sep = "";
		
		for ( Tag t: tags ){

			if ( sep.isEmpty()){
				sep = ", ";
			}else{
				sb.append( sep );
			}

			if ( path.contains( t )){
				
				sb.append( "Recursive on " + t.getTagName( true ));
				
			}else{
				
				sb.append( t.getTagName( true ));
								
				List<Tag> kids = t.dependsOnTags();
				
				if ( kids != null && !kids.isEmpty()){
				
					sb.append( " ( " );
					
					path.add( t );
					
					explode( sb, path, kids );
					
					path.remove( t );
					
					sb.append( " )" );
				}
			}
		}
	}
}
