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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,
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   See the License for the specific language governing permissions and
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package org.apache.poi.ss.formula.functions;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.CellValue;
import org.apache.poi.ss.usermodel.FormulaEvaluator;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.SheetUtil;
import org.apache.poi.util.IOUtils;
import org.apache.poi.xssf.XSSFTestDataSamples;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

/**
 * Test the COUNTIFS() function
 */
public class CountifsTests {

    private Workbook workbook;
    
    /**
     * initialize a workbook
     */
    @Before
    public void before() {
        // not sure why we allow this, COUNTIFS() is only available
        // in OOXML, it was introduced with Office 2007
        workbook = new HSSFWorkbook();
    }
    
    /**
     * Close the workbook if needed
     */
    @After
    public void after() {
        IOUtils.closeQuietly(workbook);
    }
    
    /**
     * Basic call
     */
    @Test
    public void testCallFunction() {
        Sheet sheet = workbook.createSheet("test");
        Row row1 = sheet.createRow(0);
        Cell cellA1 = row1.createCell(0, CellType.FORMULA);
        Cell cellB1 = row1.createCell(1, CellType.NUMERIC);
        Cell cellC1 = row1.createCell(2, CellType.NUMERIC);
        Cell cellD1 = row1.createCell(3, CellType.NUMERIC);
        Cell cellE1 = row1.createCell(4, CellType.NUMERIC);
        cellB1.setCellValue(1);
        cellC1.setCellValue(1);
        cellD1.setCellValue(2);
        cellE1.setCellValue(4);

        cellA1.setCellFormula("COUNTIFS(B1:C1,1, D1:E1,2)");
        FormulaEvaluator evaluator = workbook.getCreationHelper().createFormulaEvaluator();
        CellValue evaluate = evaluator.evaluate(cellA1);
        assertEquals(1.0d, evaluate.getNumberValue(), 0.000000000000001);
    }

    /**
     * Test argument count check
     */
    @Test
    public void testCallFunction_invalidArgs() {
        Sheet sheet = workbook.createSheet("test");
        Row row1 = sheet.createRow(0);
        Cell cellA1 = row1.createCell(0, CellType.FORMULA);
        cellA1.setCellFormula("COUNTIFS()");
        FormulaEvaluator evaluator = workbook.getCreationHelper().createFormulaEvaluator();
        CellValue evaluate = evaluator.evaluate(cellA1);
        assertEquals(15, evaluate.getErrorValue());
        cellA1.setCellFormula("COUNTIFS(A1:C1)");
        evaluator = workbook.getCreationHelper().createFormulaEvaluator();
        evaluate = evaluator.evaluate(cellA1);
        assertEquals(15, evaluate.getErrorValue());
        cellA1.setCellFormula("COUNTIFS(A1:C1,2,2)");
        evaluator = workbook.getCreationHelper().createFormulaEvaluator();
        evaluate = evaluator.evaluate(cellA1);
        assertEquals(15, evaluate.getErrorValue());
    }
    
    /**
     * the bug returned the wrong count, this verifies the fix
     * @throws Exception if the file can't be read
     */
    @Test
    public void testBug56822() throws Exception {
        workbook = XSSFTestDataSamples.openSampleWorkbook("56822-Countifs.xlsx");
        FormulaEvaluator evaluator = workbook.getCreationHelper().createFormulaEvaluator();
        Cell cell = SheetUtil.getCell(workbook.getSheetAt(0), 0, 3);
        assertNotNull("Test workbook missing cell D1", cell);
        CellValue evaluate = evaluator.evaluate(cell);
        assertEquals(2.0d, evaluate.getNumberValue(), 0.00000000000001);
    }
}