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// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
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// KIND, either express or implied.  See the License for the
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package org.apache.doris.nereids.rules.rewrite;

import org.apache.doris.nereids.exceptions.AnalysisException;
import org.apache.doris.nereids.rules.Rule;
import org.apache.doris.nereids.rules.RuleType;
import org.apache.doris.nereids.trees.expressions.Expression;
import org.apache.doris.nereids.trees.expressions.Match;
import org.apache.doris.nereids.trees.expressions.SlotReference;
import org.apache.doris.nereids.trees.expressions.literal.Literal;
import org.apache.doris.nereids.trees.plans.logical.LogicalFilter;

import java.util.List;

/**
 * Check match expression
 */
public class CheckMatchExpression extends OneRewriteRuleFactory {

    @Override
    public Rule build() {
        return logicalFilter(logicalOlapScan())
                .when(filter -> containsMatchExpression(filter.getExpressions()))
                .then(this::checkChildren)
                .toRule(RuleType.CHECK_MATCH_EXPRESSION);
    }

    private LogicalFilter checkChildren(LogicalFilter filter) {
        List<Expression> expressions = filter.getExpressions();
        for (Expression expr : expressions) {
            if (expr instanceof Match) {
                Match matchExpression = (Match) expr;
                if (!(matchExpression.left() instanceof SlotReference)
                        || !(matchExpression.right() instanceof Literal)) {
                    throw new AnalysisException(String.format(
                        "Only support match left operand is SlotRef, right operand is Literal"));
                }
            }
        }
        return filter;
    }

    private boolean containsMatchExpression(List<Expression> expressions) {
        return expressions.stream().anyMatch(expr -> expr.anyMatch(Match.class::isInstance));
    }
}
