package org.matheclipse.core.reflection.system;

import org.matheclipse.core.eval.exception.Validate;
import org.matheclipse.core.eval.interfaces.AbstractFunctionEvaluator;
import org.matheclipse.core.expression.F;
import org.matheclipse.core.interfaces.IAST;
import org.matheclipse.core.interfaces.IExpr;

public class Inner extends AbstractFunctionEvaluator {

	public Inner() {
	}

	@Override
	public IExpr evaluate(final IAST ast) {
		Validate.checkRange(ast, 4, 5);

		if ((ast.get(2).isVector() < 0) || (ast.get(3).isVector() < 0)) {
			return null;
		}
		IAST result;
		if (ast.size() == 4) {
			result = F.ast(F.Plus);
		} else {
			result = F.ast(ast.get(4));
		}
		
		
		
		IAST l2 = (IAST) ast.get(2);
		IAST l3 = (IAST) ast.get(3);
		if (l2.size() != l2.size()) {
			return null;
		}
		IAST temp;
		for (int i = 1; i < l2.size(); i++) {
			temp = F.ast(ast.get(1));
			temp.add(l2.get(i));
			temp.add(l3.get(i));
			result.add(temp);
		}
		return result;
	}

}