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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 org.apache.pinot.client;

import com.fasterxml.jackson.databind.JsonNode;


/**
 * A Pinot query result set for aggregation results without group by clauses, of which there is one
 * of per aggregation
 * function in the query.
 */
class AggregationResultSet extends AbstractResultSet {
  private final JsonNode _jsonObject;

  public AggregationResultSet(JsonNode jsonObject) {
    _jsonObject = jsonObject;
  }

  @Override
  public int getRowCount() {
    return 1;
  }

  @Override
  public int getColumnCount() {
    return 1;
  }

  @Override
  public String getColumnName(int columnIndex) {
    return _jsonObject.get("function").asText();
  }

  @Override
  public String getString(int rowIndex, int columnIndex) {
    if (columnIndex != 0) {
      throw new IllegalArgumentException("Column index must always be 0 for aggregation result sets");
    }

    if (rowIndex != 0) {
      throw new IllegalArgumentException("Row index must always be 0 for aggregation result sets");
    }

    return _jsonObject.get("value").asText();
  }

  @Override
  public int getGroupKeyLength() {
    return 0;
  }

  @Override
  public String getGroupKeyColumnName(int groupKeyColumnIndex) {
    throw new AssertionError("No group key column name for aggregation results");
  }

  @Override
  public String getGroupKeyString(int rowIndex, int groupKeyColumnIndex) {
    throw new AssertionError("No grouping key for queries without a group by clause");
  }

  @Override
  public String toString() {
    int numColumns = getColumnCount();
    TextTable table = new TextTable();
    String[] columnNames = new String[numColumns];

    for (int c = 0; c < getColumnCount(); c++) {
      columnNames[c] = getColumnName(c);
    }
    table.addHeader(columnNames);

    int numRows = getRowCount();
    for (int r = 0; r < numRows; r++) {
      String[] columnValues = new String[numColumns];
      for (int c = 0; c < getColumnCount(); c++) {
        columnValues[c] = getString(r, c);
      }
      table.addRow(columnValues);
    }
    return table.toString();
  }
}