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/************************************************************************
 * © 2023-2024 SAP SE or an SAP affiliate company. All rights reserved. *
 ************************************************************************/
package com.sap.cds.jdbc.hana;

import com.sap.cds.jdbc.generic.GenericPredicateMapper;
import com.sap.cds.jdbc.generic.GenericPredicateModifier;
import com.sap.cds.jdbc.generic.UnfoldIsOperatorModifier;
import com.sap.cds.ql.CQL;
import com.sap.cds.ql.Value;
import com.sap.cds.ql.cqn.CqnComparisonPredicate.Operator;
import com.sap.cds.ql.cqn.CqnPredicate;
import com.sap.cds.ql.cqn.Modifier;
import static com.sap.cds.util.CqnStatementUtils.unfold;

public class HanaPredicateMapper extends GenericPredicateMapper {

	@Override
	public CqnPredicate apply(CqnPredicate pred) {
		Modifier m = new GenericPredicateModifier() {

			@Override
			public CqnPredicate comparison(Value lhs, Operator op, Value rhs) {
				CqnPredicate comp = CQL.comparison(lhs, op, rhs);
				comp = switch (op) {
					case GT, GE, LT, LE, IS, IS_NOT -> unfold(comp);
					default -> comp;
				};
				return CQL.copy(comp, new UnfoldIsOperatorModifier());
			}

		};

		return CQL.copy(pred, m);
	}
}