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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
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   */
  package org.apache.beam.it.gcp.bigquery.matchers;
  
  import static org.apache.beam.it.truthmatchers.PipelineAsserts.assertThatRecords;
  
  import com.fasterxml.jackson.core.type.TypeReference;
  import com.fasterxml.jackson.databind.ObjectMapper;
  import com.google.cloud.bigquery.FieldValueList;
  import com.google.cloud.bigquery.InsertAllRequest;
  import com.google.cloud.bigquery.TableResult;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import org.apache.beam.it.truthmatchers.RecordsSubject;
  
  /** Assert utilities for BigQuery tests. */
  public class BigQueryAsserts {
  
    private static final ObjectMapper objectMapper = new ObjectMapper();
  
    private static final TypeReference<Map<String, Object>> recordTypeReference =
        new TypeReference<Map<String, Object>>() {};
  
    /**
     * Convert BigQuery {@link TableResult} to a list of maps.
     *
     * @param tableResult Table Result to parse
     * @return List of maps to use in {@link RecordsSubject}
     */
    public static List<Map<String, Object>> tableResultToRecords(TableResult tableResult) {
      try {
        List<Map<String, Object>> records = new ArrayList<>();
  
        for (FieldValueList row : tableResult.iterateAll()) {
          String jsonRow = row.get(0).getStringValue();
          Map<String, Object> converted = objectMapper.readValue(jsonRow, recordTypeReference);
          records.add(converted);
        }
  
        return records;
      } catch (Exception e) {
        throw new RuntimeException("Error converting TableResult to Records", e);
      }
    }
  
    /**
     * Convert BigQuery {@link InsertAllRequest.RowToInsert} to a list of maps.
     *
     * @param rows BigQuery rows to parse.
     * @return List of maps to use in {@link RecordsSubject}
     */
    public static List<Map<String, Object>> bigQueryRowsToRecords(
        List<InsertAllRequest.RowToInsert> rows) {
      try {
        List<Map<String, Object>> records = new ArrayList<>();
        rows.forEach(row -> records.add(new HashMap<>(row.getContent())));
  
        return records;
      } catch (Exception e) {
        throw new RuntimeException("Error converting BigQuery Row to Map", e);
      }
    }
  
    /**
     * Convert BigQuery {@link InsertAllRequest.RowToInsert} to a list of maps.
     *
     * @param rows BigQuery rows to parse.
     * @param excludeCols BigQuery columns to filter out of result.
     * @return List of maps to use in {@link RecordsSubject}
     */
    public static List<Map<String, Object>> bigQueryRowsToRecords(
        List<InsertAllRequest.RowToInsert> rows, List<String> excludeCols) {
      List<Map<String, Object>> records = bigQueryRowsToRecords(rows);
      try {
        excludeCols.forEach(col -> records.forEach(row -> row.remove(col)));
  
        return records;
      } catch (Exception e) {
        throw new RuntimeException("Error converting BigQuery Row to Map", e);
      }
    }
  
    /**
     * Creates a {@link RecordsSubject} to assert information within a list of records.
     *
     * @param tableResult Records in BigQuery {@link TableResult} format to use in the comparison.
     * @return Truth Subject to chain assertions.
     */
    public static RecordsSubject assertThatBigQueryRecords(TableResult tableResult) {
      return assertThatRecords(tableResultToRecords(tableResult));
    }
  }
  