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.cassandra.distributed.util;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  import java.util.Map;
  import java.util.Objects;
  import java.util.function.Function;
  import java.util.function.Predicate;
  
  import com.google.monitoring.runtime.instrumentation.common.collect.Iterators;
  import org.apache.cassandra.distributed.api.QueryResults;
  import org.apache.cassandra.distributed.api.Row;
  import org.apache.cassandra.distributed.api.SimpleQueryResult;
  import org.apache.cassandra.distributed.shared.AssertUtils;
  import org.apache.cassandra.tools.nodetool.formatter.TableBuilder;
  import org.assertj.core.api.Assertions;
  import org.assertj.core.data.Index;
  
  public class QueryResultUtil
  {
      private QueryResultUtil()
      {
      }
  
      public static void orderBy(SimpleQueryResult qr, String... columns)
      {
          if (columns == null || columns.length == 0)
              throw new IllegalArgumentException("No columns defined");
          int[] index = new int[columns.length];
          {
              int offset = 0;
              for (String name : columns)
              {
                  int idx = qr.names().indexOf(name);
                  if (idx == -1)
                      throw new IllegalArgumentException("Unknown column " + name);
                  index[offset++] = idx;
              }
          }
          qr.reset();
          Arrays.sort(qr.toObjectArrays(), (a, b) -> {
              for (int i = 0; i < index.length; i++)
              {
                  int idx = index[i];
                  Object ao = a[idx];
                  Object bo = b[idx];
                  if (ao == null && bo == null) return 0;
                  if (ao == null) return 1;
                  if (bo == null) return -1;
                  int rc = ((Comparable) ao).compareTo(bo);
                  if (rc != 0) return rc;
              }
              return 0;
          });
      }
  
      @SuppressWarnings("unchecked")
      public static SimpleQueryResult map(SimpleQueryResult input, Map<String, ? extends Function<?, Object>> mapper)
      {
          if (input.toObjectArrays().length == 0 || mapper == null || mapper.isEmpty())
              return input;
          for (String name : mapper.keySet())
          {
              if (!input.names().contains(name))
                  throw new IllegalArgumentException("Unable to find column " + name);
          }
          Object[][] rows = input.toObjectArrays().clone();
          List<String> names = new ArrayList<>(mapper.keySet());
          int[] idxes = names.stream().mapToInt(input.names()::indexOf).toArray();
          for (int i = 0; i < rows.length; i++)
          {
              Object[] row = rows[i].clone();
              for (int j = 0; j < idxes.length; j++)
              {
                  @SuppressWarnings("rawtypes") Function map = mapper.get(names.get(j));
                  int idx = idxes[j];
                  row[idx] = map.apply(row[idx]);
              }
              rows[i] = row;
          }
          return new SimpleQueryResult(input.names().toArray(new String[0]), rows, input.warnings());
      }
  
      public static boolean contains(SimpleQueryResult qr, Object... values)
      {
          return contains(qr, a -> equals(a, values));
      }
  
      public static boolean contains(SimpleQueryResult qr, Row row)
      {
          return contains(qr, a -> equals(a, row));
      }
  
      public static boolean contains(SimpleQueryResult qr, Predicate<Row> fn)
      {
          while (qr.hasNext())
          {
              if (fn.test(qr.next()))
                  return true;
          }
          return false;
      }
  
      private static boolean equals(Row a, Row b)
      {
          return equals(a, b.toObjectArray());
      }
  
      private static boolean equals(Row a, Object[] bs)
      {
          Object[] as = a.toObjectArray();
          if (as.length != bs.length)
              return false;
          for (int i = 0; i < as.length; i++)
          {
              if (!Objects.equals(as[i], bs[i]))
                  return false;
          }
          return true;
      }
  
      public static SimpleQueryResultAssertHelper assertThat(SimpleQueryResult qr)
      {
          return new SimpleQueryResultAssertHelper(qr);
      }
  
      public static RowAssertHelper assertThat(Row row)
      {
          return new RowAssertHelper(row);
      }
  
      public static String expand(SimpleQueryResult qr)
      {
          StringBuilder sb = new StringBuilder();
          int rowNum = 1;
          qr.mark();
          while (qr.hasNext())
          {
              sb.append("@ Row ").append(rowNum).append('\n');
              TableBuilder table = new TableBuilder('|');
              Row next = qr.next();
              for (String column : qr.names())
              {
                  Object value = next.get(column);
                  table.add(column, value == null ? null : value.toString());
              }
              sb.append(table);
          }
          qr.reset();
          return sb.toString();
      }
  
      public static QueryBuilder query(SimpleQueryResult result)
      {
          return new QueryBuilder(result);
      }
  
      public static class RowAssertHelper
      {
          private final Row row;
  
          public RowAssertHelper(Row row)
          {
              this.row = row;
          }
  
          public RowAssertHelper isEqualTo(String column, Object expected)
          {
              Object actual = row.get(column);
              Assertions.assertThat(actual).describedAs("Column %s had unexpected value", column).isEqualTo(expected);
              return this;
          }
  
          public RowAssertHelper columnsEqualTo(String first, String... others)
          {
              Object expected = row.get(first);
              for (String other : others)
                  Assertions.assertThat(row.<Object>get(other)).describedAs("Columns %s and %s are not equal", first, other).isEqualTo(expected);
              return this;
          }
      }
  
      public static class SimpleQueryResultAssertHelper
      {
          private final SimpleQueryResult qr;
  
          private SimpleQueryResultAssertHelper(SimpleQueryResult qr)
          {
              this.qr = qr;
          }
  
          public SimpleQueryResultAssertHelper contains(Object... values)
          {
              qr.reset();
              if (!QueryResultUtil.contains(qr, a -> QueryResultUtil.equals(a, values)))
                  throw new AssertionError("Row " + Arrays.asList(values) + " is not present");
              return this;
          }
  
          public SimpleQueryResultAssertHelper contains(Row row)
          {
              qr.reset();
              if (!QueryResultUtil.contains(qr, a -> QueryResultUtil.equals(a, row)))
                  throw new AssertionError("Row " + row + " is not present");
              return this;
          }
  
          public SimpleQueryResultAssertHelper contains(Predicate<Row> fn)
          {
              qr.reset();
              if (!QueryResultUtil.contains(qr, fn))
                  throw new AssertionError("Row  is not present");
              return this;
          }
  
          public SimpleQueryResultAssertHelper isEqualTo(SimpleQueryResult expectedResult)
          {
              qr.mark();
              expectedResult.mark();
              try
              {
                  // org.apache.cassandra.distributed.shared.AssertUtils.assertRows has some issues with the error msg
                  // so rewrite to make sure to have a nicer msg
                  List<String> otherNames = qr.names().isEmpty() ? expectedResult.names() : qr.names();
                  Assertions.assertThat(otherNames).describedAs("Column names do not match").isEqualTo(qr.names());
                  int rowId = 0;
                  while (qr.hasNext())
                  {
                      if (!expectedResult.hasNext())
                          throw new AssertionError("Unexpected row at index " + rowId + "; found " + Arrays.toString(qr.next().toObjectArray()));
                      Row next = qr.next();
                      Row expected = expectedResult.next();
                      if (!Arrays.equals(next.toObjectArray(), expected.toObjectArray()))
                          throw new AssertionError("Expected row " + rowId + " to be " + Arrays.toString(expected.toObjectArray()) + " but was " + Arrays.toString(next.toObjectArray()));
  
                      rowId++;
                  }
                  if (expectedResult.hasNext())
                      throw new AssertionError("Expected row " + rowId + " to be " + Arrays.toString(expectedResult.next().toObjectArray()) + " but was missing");
  
                  AssertUtils.assertRows(qr, expectedResult);
              }
              finally
              {
                  qr.reset();
                  expectedResult.reset();
              }
              return this;
          }
  
          public SimpleQueryResultAssertHelper isEqualTo(Object... values)
          {
              Assertions.assertThat(qr.toObjectArrays())
                        .hasNumberOfRows(1)
                        .contains(values, Index.atIndex(0));
              return this;
          }
  
          public SimpleQueryResultAssertHelper isDeepEqualTo(Object[][] values)
          {
              Object[][] results = qr.toObjectArrays();
              Assertions.assertThat(results)
                        .hasNumberOfRows(values.length)
                        .isDeepEqualTo(values);
              return this;
          }
  
          public SimpleQueryResultAssertHelper hasSize(int size)
          {
              Assertions.assertThat(qr.toObjectArrays()).hasNumberOfRows(size);
              return this;
          }
  
          public SimpleQueryResultAssertHelper hasSizeGreaterThan(int size)
          {
              Assertions.assertThat((qr.toObjectArrays()).length).isGreaterThan(size);
              return this;
          }
  
          public void isEmpty()
          {
              int size = Iterators.size(qr);
              Assertions.assertThat(size).describedAs("QueryResult is not empty").isZero();
          }
      }
  
      public static class QueryBuilder
      {
          private final SimpleQueryResult input;
          private final List<String> names = new ArrayList<>();
          private Predicate<Row> filter = ignore -> true;
  
          public QueryBuilder(SimpleQueryResult input)
          {
              this.input = input;
          }
  
          public QueryBuilder select(String... names)
          {
              for (String name : names)
              {
                  if (!input.names().contains(name))
                      throw new IllegalArgumentException("Unknown column " + name);
              }
              this.names.clear();
              // if names is empty, then this becomes "SELECT *"
              this.names.addAll(Arrays.asList(names));
              return this;
          }
  
          public QueryBuilder filter(Predicate<Row> fn)
          {
              this.filter = fn;
              return this;
          }
  
          public SimpleQueryResult build()
          {
              QueryResults.Builder builder = QueryResults.builder();
              if (names.isEmpty())
              {
                  builder.columns(input.names().toArray(new String[0]));
                  while (input.hasNext())
                  {
                      Row row = input.next();
                      if (filter.test(row))
                          builder.row(row.toObjectArray());
                  }
              }
              else
              {
                  String[] names = this.names.toArray(new String[0]);
                  builder.columns(names);
                  int[] index = new int[names.length];
                  {
                      int offset = 0;
                      for (String name : names)
                          index[offset++] = input.names().indexOf(name);
                  }
                  Row row = new Row(names);
                  while (input.hasNext())
                  {
                      Object[] raw = input.next().toObjectArray();
                      Object[] updated = new Object[index.length];
                      for (int i = 0; i < index.length; i++)
                          updated[i] = raw[index[i]];
                      row.setResults(updated);
                      if (filter.test(row))
                          builder.row(updated);
                  }
              }
              return builder.build();
          }
      }
  }
  