content: /*
   * 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.it.gcp.spanner.matchers;
  
  import static org.apache.beam.it.gcp.artifacts.utils.JsonTestUtil.parseJsonString;
  import static org.apache.beam.it.truthmatchers.PipelineAsserts.assertThatRecords;
  
  import com.google.cloud.spanner.Mutation;
  import com.google.cloud.spanner.Struct;
  import com.google.cloud.spanner.Type;
  import com.google.cloud.spanner.Type.Code;
  import com.google.cloud.spanner.Value;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.stream.Collectors;
  import org.apache.beam.it.truthmatchers.RecordsSubject;
  
  public class SpannerAsserts {
  
    /**
     * Convert Spanner {@link Struct} list to a list of maps.
     *
     * @param structs Structs to parse
     * @return List of maps to use in {@link RecordsSubject}
     */
    public static List<Map<String, Object>> structsToRecords(List<Struct> structs) {
      try {
        List<Map<String, Object>> records = new ArrayList<>();
  
        for (Struct struct : structs) {
          Map<String, Object> record = new HashMap<>();
  
          for (Type.StructField field : struct.getType().getStructFields()) {
            Value fieldValue = struct.getValue(field.getName());
            // May need to explore using typed methods instead of .toString()
            record.put(field.getName(), fieldValue.toString());
          }
  
          records.add(record);
        }
  
        return records;
      } catch (Exception e) {
        throw new RuntimeException("Error converting TableResult to Records", e);
      }
    }
  
    /**
     * Convert Spanner {@link Mutation} list to a list of maps.
     *
     * @param mutations Mutations to parse
     * @return List of maps to use in {@link RecordsSubject}
     */
    public static List<Map<String, Object>> mutationsToRecords(List<Mutation> mutations) {
      try {
        List<Map<String, Object>> records = new ArrayList<>();
        mutations.forEach(
            entry ->
                records.add(
                    entry.asMap().entrySet().stream()
                        .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue))));
  
        return records;
      } catch (Exception e) {
        throw new RuntimeException("Error converting TableResult to Records", e);
      }
    }
  
    /**
     * Convert a list of Spanner {@link Mutation} objects into a list of maps, extracting specified
     * columns.
     *
     * @param mutations The list of mutations to process.
     * @param columns The columns to extract.
     * @return List of maps to use in {@link RecordsSubject}
     */
    public static List<Map<String, Object>> mutationsToRecords(
        List<Mutation> mutations, List<String> columns) {
      try {
        List<Map<String, Object>> records = new ArrayList<>();
        mutations.forEach(
            entry -> {
              records.add(
                  entry.asMap().entrySet().stream()
                      .filter((e) -> columns.contains(e.getKey()))
                      .collect(
                          Collectors.toMap(
                              Map.Entry::getKey,
                              (e) -> {
                                if (e.getValue().getType().getCode() == Code.ARRAY) {
                                  return e.getValue().getAsStringList();
                                }
                                if (Arrays.asList(Code.JSON, Code.PG_JSONB)
                                    .contains(e.getValue().getType().getCode())) {
                                  try {
                                    return parseJsonString(e.getValue().getJson());
                                  } catch (IOException ex) {
                                    throw new RuntimeException(ex);
                                  }
                                }
                                return e.getValue().getAsString();
                              })));
            });
        return records;
      } catch (Exception e) {
        throw new RuntimeException("Error converting TableResult to Records", e);
      }
    }
  
    /**
     * Creates a {@link RecordsSubject} to assert information within a list of records.
     *
     * @param structs Records in Spanner {@link Struct} format to use in the comparison.
     * @return Truth Subject to chain assertions.
     */
    public static RecordsSubject assertThatStructs(List<Struct> structs) {
      return assertThatRecords(structsToRecords(structs));
    }
  
    /**
     * Creates a {@link RecordsSubject} to assert information within a list of records.
     *
     * @param mutations Mutations in Spanner {@link Mutation} format to use in the comparison.
     * @return Truth Subject to chain assertions.
     */
    public static RecordsSubject assertThatMutations(List<Mutation> mutations) {
      return assertThatRecords(mutationsToRecords(mutations));
    }
  }
  