/*
 * QQQ - Low-code Application Framework for Engineers.
 * Copyright (C) 2021-2023.  Kingsrook, LLC
 * 651 N Broad St Ste 205 # 6917 | Middletown DE 19709 | United States
 * contact@kingsrook.com
 * https://github.com/Kingsrook/
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

package com.kingsrook.qqq.backend.core.processes.implementations.columnstats;


import java.io.Serializable;
import java.math.BigDecimal;
import java.util.List;
import java.util.Map;
import com.kingsrook.qqq.backend.core.BaseTest;
import com.kingsrook.qqq.backend.core.actions.tables.InsertAction;
import com.kingsrook.qqq.backend.core.exceptions.QException;
import com.kingsrook.qqq.backend.core.model.actions.processes.RunBackendStepInput;
import com.kingsrook.qqq.backend.core.model.actions.processes.RunBackendStepOutput;
import com.kingsrook.qqq.backend.core.model.actions.tables.insert.InsertInput;
import com.kingsrook.qqq.backend.core.model.data.QRecord;
import com.kingsrook.qqq.backend.core.utils.TestUtils;
import org.junit.jupiter.api.Test;
import static org.assertj.core.api.Assertions.assertThat;


/*******************************************************************************
 ** Unit test for ColumnStatsStep 
 *******************************************************************************/
class ColumnStatsStepTest extends BaseTest
{

   /*******************************************************************************
    **
    *******************************************************************************/
   @Test
   void testEmptyStringAndNullRollUpTogether() throws QException
   {
      InsertInput insertInput = new InsertInput();
      insertInput.setTableName(TestUtils.TABLE_NAME_PERSON_MEMORY);
      insertInput.setRecords(List.of(
         new QRecord().withValue("noOfShoes", 1).withValue("lastName", "Simpson"),
         new QRecord().withValue("noOfShoes", 2).withValue("lastName", "Simpson"),
         new QRecord().withValue("noOfShoes", 2).withValue("lastName", "Simpson"),
         new QRecord().withValue("noOfShoes", 2).withValue("lastName", ""), // this record and the next one -
         new QRecord().withValue("noOfShoes", 3).withValue("lastName", null), // this record and the previous - should both come out as null below
         new QRecord().withValue("noOfShoes", null).withValue("lastName", "Flanders")
      ));
      new InsertAction().execute(insertInput);

      RunBackendStepInput input = new RunBackendStepInput();
      input.addValue("tableName", TestUtils.TABLE_NAME_PERSON_MEMORY);
      input.addValue("fieldName", "lastName");
      input.addValue("orderBy", "count.desc");

      RunBackendStepOutput output = new RunBackendStepOutput();
      new ColumnStatsStep().run(input, output);

      Map<String, Serializable> values = output.getValues();

      @SuppressWarnings("unchecked")
      List<QRecord> valueCounts = (List<QRecord>) values.get("valueCounts");

      assertThat(valueCounts.get(0).getValues())
         .hasFieldOrPropertyWithValue("lastName", "Simpson")
         .hasFieldOrPropertyWithValue("count", 3)
         .hasFieldOrPropertyWithValue("percent", new BigDecimal("50.00"));

      assertThat(valueCounts.get(1).getValues())
         .hasFieldOrPropertyWithValue("lastName", null)
         .hasFieldOrPropertyWithValue("count", 2) // here's the assert for the "" and null record above.
         .hasFieldOrPropertyWithValue("percent", new BigDecimal("33.33"));

      assertThat(valueCounts.get(2).getValues())
         .hasFieldOrPropertyWithValue("lastName", "Flanders")
         .hasFieldOrPropertyWithValue("count", 1)
         .hasFieldOrPropertyWithValue("percent", new BigDecimal("16.67"));
   }

}