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/*
 * 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 io.github.matteobertozzi.easerinsights.jdbc.sql;

import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Collection;
import java.util.List;

import io.github.matteobertozzi.easerinsights.jdbc.connection.DbConnection;
import io.github.matteobertozzi.easerinsights.jdbc.sql.SqlTableSchema.SqlField;
import io.github.matteobertozzi.easerinsights.jdbc.sql.impl.SqlResultImpl;
import io.github.matteobertozzi.rednaco.util.function.FailableConsumer;
import io.github.matteobertozzi.rednaco.util.function.FailableFunction;

public record SqlSelectQuery(SqlField[] fields, String sql, List params) {
  public void bind(final PreparedStatement stmt) throws SQLException {
    int index = 1;
    for (final Object param: params()) {
      stmt.setObject(index++, param);
    }
  }

  public int fetch(final DbConnection connection, final FailableConsumer rowConsumer) throws Exception {
    try (PreparedStatement stmt = connection.prepareStatement(sql())) {
      bind(stmt);
      return fetch(stmt, rowConsumer);
    }
  }

  public int streamingFetch(final DbConnection connection, final SqlTableSchema table, final FailableConsumer rowConsumer) throws Exception {
    try (PreparedStatement stmt = connection.prepareStreamingStatement(table.tableName(), sql())) {
      bind(stmt);
      return fetch(stmt, rowConsumer);
    }
  }

  private int fetch(final PreparedStatement stmt, final FailableConsumer rowConsumer) throws Exception {
    try (ResultSet rs = stmt.executeQuery()) {
      int count = 0;
      final SqlResultRow rsRow = new SqlResultImpl(rs, fields());
      while (rs.next()) {
        rowConsumer.accept(rsRow);
        count++;
      }
      return count;
    }
  }

  public  int fetch(final DbConnection connection, final Collection results, final FailableFunction mapper) throws Exception {
    try (PreparedStatement stmt = connection.prepareStatement(sql())) {
      bind(stmt);
      return fetch(stmt, results, mapper);
    }
  }

  public  int streamingFetch(final DbConnection connection, final SqlTableSchema table, final Collection results, final FailableFunction mapper) throws Exception {
    try (PreparedStatement stmt = connection.prepareStreamingStatement(table.tableName(), sql())) {
      bind(stmt);
      return fetch(stmt, results, mapper);
    }
  }

  private  int fetch(final PreparedStatement stmt, final Collection results, final FailableFunction mapper) throws Exception {
    try (ResultSet rs = stmt.executeQuery()) {
      final SqlResultRow rsRow = new SqlResultImpl(rs, fields());
      int count = 0;
      while (rs.next()) {
        final T row = mapper.apply(rsRow);
        results.add(row);
        count++;
      }
      return count;
    }
  }
}
    

    

    

            

    

            



    
    






    
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