/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file 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 "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.shardingsphere.encrypt.rewrite.token.generator.assignment;

import lombok.RequiredArgsConstructor;
import lombok.Setter;
import org.apache.shardingsphere.encrypt.rule.EncryptRule;
import org.apache.shardingsphere.infra.annotation.HighFrequencyInvocation;
import org.apache.shardingsphere.infra.binder.context.statement.SQLStatementContext;
import org.apache.shardingsphere.infra.binder.context.statement.type.dml.UpdateStatementContext;
import org.apache.shardingsphere.infra.metadata.database.ShardingSphereDatabase;
import org.apache.shardingsphere.infra.rewrite.sql.token.common.generator.CollectionSQLTokenGenerator;
import org.apache.shardingsphere.infra.rewrite.sql.token.common.pojo.SQLToken;
import org.apache.shardingsphere.sql.parser.statement.core.segment.generic.table.SimpleTableSegment;

import java.util.Collection;

/**
 * Update assignment generator for encrypt.
 */
@HighFrequencyInvocation
@RequiredArgsConstructor
@Setter
public final class EncryptUpdateAssignmentTokenGenerator implements CollectionSQLTokenGenerator<UpdateStatementContext> {
    
    private final EncryptRule rule;
    
    private final ShardingSphereDatabase database;
    
    @Override
    public boolean isGenerateSQLToken(final SQLStatementContext sqlStatementContext) {
        return sqlStatementContext instanceof UpdateStatementContext && containsEncryptTable(sqlStatementContext.getTablesContext().getSimpleTables());
    }
    
    private boolean containsEncryptTable(final Collection<SimpleTableSegment> simpleTableSegments) {
        for (SimpleTableSegment each : simpleTableSegments) {
            if (rule.findEncryptTable(each.getTableName().getIdentifier().getValue()).isPresent()) {
                return true;
            }
        }
        return false;
    }
    
    @Override
    public Collection<SQLToken> generateSQLTokens(final UpdateStatementContext sqlStatementContext) {
        return new EncryptAssignmentTokenGenerator(rule, database.getName(), sqlStatementContext.getSqlStatement().getDatabaseType())
                .generateSQLTokens(sqlStatementContext.getTablesContext(), sqlStatementContext.getSqlStatement().getSetAssignment());
    }
}
