/*
 * 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.beam.sdk.extensions.sql.meta.provider.text;

import static org.apache.beam.sdk.extensions.sql.impl.schema.BeamTableUtils.csvLine2BeamRow;

import java.io.Serializable;
import org.apache.beam.sdk.schemas.Schema;
import org.apache.beam.sdk.transforms.DoFn;
import org.apache.beam.sdk.transforms.PTransform;
import org.apache.beam.sdk.transforms.ParDo;
import org.apache.beam.sdk.values.PCollection;
import org.apache.beam.sdk.values.Row;
import org.apache.commons.csv.CSVFormat;

/** IOReader for {@code BeamTextCSVTable}. */
public class BeamTextCSVTableIOReader extends PTransform<PCollection<String>, PCollection<Row>>
    implements Serializable {
  private String filePattern;
  protected Schema schema;
  protected CSVFormat csvFormat;

  public BeamTextCSVTableIOReader(Schema schema, String filePattern, CSVFormat csvFormat) {
    this.filePattern = filePattern;
    this.schema = schema;
    this.csvFormat = csvFormat;
  }

  @Override
  public PCollection<Row> expand(PCollection<String> input) {
    return input.apply(
        ParDo.of(
            new DoFn<String, Row>() {
              @ProcessElement
              public void processElement(ProcessContext ctx) {
                String str = ctx.element();
                ctx.output(csvLine2BeamRow(csvFormat, str, schema));
              }
            }));
  }
}
