/**
 *
 * 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/>.
 * 
 **/
package lucee.runtime.functions.arrays;

import lucee.runtime.PageContext;
import lucee.runtime.exp.ExpressionException;
import lucee.runtime.exp.FunctionException;
import lucee.runtime.exp.PageException;
import lucee.runtime.ext.function.BIF;
import lucee.runtime.op.Caster;
import lucee.runtime.type.Array;
import lucee.runtime.type.ArrayImpl;

public final class ArrayMid extends BIF {

	private static final long serialVersionUID = 4996354700884413289L;

	public static Array call(PageContext pc , Array arr, double start) throws ExpressionException {
		return call(pc,arr,start,-1);
	}
	
	public static Array call(PageContext pc , Array arr, double start, double count) throws ExpressionException {
		int s=(int) start;
		int c=(int) count;
		
		if(s<1) throw new FunctionException(pc, "ArrayMid", 2, "start", "Parameter which is now ["+s+"] must be a positive integer");
		if(c==-1) c=arr.size();
		else if(c<-1) throw new FunctionException(pc, "ArrayMid", 3, "count", "Parameter which is now ["+c+"] must be a non-negative integer or -1 (for string length)");
		c+=s-1;
		if(s>arr.size()) return new ArrayImpl();
		
		ArrayImpl rtn = new ArrayImpl();
		int len = arr.size();
		Object value;
		for(int i=s;i<=c && i<=len ;i++){
			value=arr.get(i, null);
			rtn.appendEL(value);
		}
		return rtn;
	}
	
	@Override
	public Object invoke(PageContext pc, Object[] args) throws PageException {
		if(args.length==2)return call(pc,Caster.toArray(args[0]),Caster.toDoubleValue(args[1]));
		return call(pc,Caster.toArray(args[0]),Caster.toDoubleValue(args[1]),Caster.toDoubleValue(args[2]));
	}
}