/**
 *
 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either 
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public 
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 * 
 **/
/**
 * Implements the CFML Function structkeylist
 */
package lucee.runtime.functions.struct;

import java.util.Iterator;

import lucee.runtime.PageContext;
import lucee.runtime.exp.PageException;
import lucee.runtime.ext.function.BIF;
import lucee.runtime.op.Caster;
import lucee.runtime.type.Collection.Key;
import lucee.runtime.type.Struct;

public final class StructKeyList extends BIF {
	
	private static final long serialVersionUID = 6256709521354910213L;

	public static String call(PageContext pc , Struct struct) {
		return call(pc,struct,",");//KeyImpl.toUpperCaseList(struct.keys(), ",");
	}
	public static String call(PageContext pc , Struct struct, String delimiter) {
		//return KeyImpl.toList(CollectionUtil.keys(struct), delimiter);
		
		if(struct==null) return "";
		Iterator<Key> it = struct.keyIterator();
		
		// first
		if(!it.hasNext()) return "";
		StringBuilder sb=new StringBuilder();
		sb.append(it.next().getString());
		
		// rest
		if(delimiter.length()==1) {
			char c=delimiter.charAt(0);
			while(it.hasNext()){
				sb.append(c);
				sb.append(it.next().getString());
			}
		}
		else {
			while(it.hasNext()){
				sb.append(delimiter);
				sb.append(it.next().getString());
			}
		}
		
		return sb.toString();
	}
	
	@Override
	public Object invoke(PageContext pc, Object[] args) throws PageException {
		if(args.length==2) return call(pc,Caster.toStruct(args[0]),Caster.toString(args[1]));
		return call(pc,Caster.toStruct(args[0]));
	}
}