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   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
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package org.apache.poi.ss.formula.eval;

import org.apache.poi.hssf.HSSFTestDataSamples;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.ss.usermodel.*;
import org.junit.Test;

import java.io.IOException;
import java.io.InputStream;

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

/**
 * Miscellaneous tests for bugzilla entries.<p/> The test name contains the
 * bugzilla bug id.
 */
public final class TestFormulaBugs {

	/**
	 * Bug 27349 - VLOOKUP with reference to another sheet.<p/> This test was
	 * added <em>long</em> after the relevant functionality was fixed.
	 */
    @Test
	public void test27349() throws Exception {
		// 27349-vlookupAcrossSheets.xls is bugzilla/attachment.cgi?id=10622
		InputStream is = HSSFTestDataSamples.openSampleFileStream("27349-vlookupAcrossSheets.xls");
        // original bug may have thrown exception here,
        // or output warning to stderr
		Workbook wb = new HSSFWorkbook(is);

		Sheet sheet = wb.getSheetAt(0);
		Row row = sheet.getRow(1);
		Cell cell = row.getCell(0);

		// this definitely would have failed due to 27349
		assertEquals("VLOOKUP(1,'DATA TABLE'!$A$8:'DATA TABLE'!$B$10,2)", cell
				.getCellFormula());

		// We might as well evaluate the formula
		FormulaEvaluator fe = wb.getCreationHelper().createFormulaEvaluator();
		CellValue cv = fe.evaluate(cell);

		assertEquals(CellType.NUMERIC, cv.getCellTypeEnum());
		assertEquals(3.0, cv.getNumberValue(), 0.0);
		
		wb.close();
		is.close();
	}

	/**
	 * Bug 27405 - isnumber() formula always evaluates to false in if statement<p/>
	 * 
	 * seems to be a duplicate of 24925
	 */
    @Test
	public void test27405() throws Exception {
		Workbook wb = new HSSFWorkbook();
		Sheet sheet = wb.createSheet("input");
		// input row 0
		Row row = sheet.createRow(0);
		/*Cell cell =*/ row.createCell(0);
		Cell cell = row.createCell(1);
		cell.setCellValue(1); // B1
		// input row 1
		row = sheet.createRow(1);
		cell = row.createCell(1);
		cell.setCellValue(999); // B2

		int rno = 4;
		row = sheet.createRow(rno);
		cell = row.createCell(1); // B5
		cell.setCellFormula("isnumber(b1)");
		cell = row.createCell(3); // D5
		cell.setCellFormula("IF(ISNUMBER(b1),b1,b2)");

//		if (false) { // set true to check excel file manually
//			// bug report mentions 'Editing the formula in excel "fixes" the problem.'
//			try {
//				FileOutputStream fileOut = new FileOutputStream("27405output.xls");
//				wb.write(fileOut);
//				fileOut.close();
//			} catch (IOException e) {
//				throw new RuntimeException(e);
//			}
//		}
		
		// use POI's evaluator as an extra sanity check
		FormulaEvaluator fe = wb.getCreationHelper().createFormulaEvaluator();
		CellValue cv;
		cv = fe.evaluate(cell);
		assertEquals(CellType.NUMERIC, cv.getCellTypeEnum());
		assertEquals(1.0, cv.getNumberValue(), 0.0);
		
		cv = fe.evaluate(row.getCell(1));
		assertEquals(CellType.BOOLEAN, cv.getCellTypeEnum());
		assertEquals(true, cv.getBooleanValue());
		
		wb.close();
	}

	/**
	 * Bug 42448 - Can't parse SUMPRODUCT(A!C7:A!C67, B8:B68) / B69 <p/>
	 */
    @Test
	public void test42448() throws IOException {
		Workbook wb = new HSSFWorkbook();
		Sheet sheet1 = wb.createSheet("Sheet1");

		Row row = sheet1.createRow(0);
		Cell cell = row.createCell(0);

		// it's important to create the referenced sheet first
		Sheet sheet2 = wb.createSheet("A"); // note name 'A'
		// TODO - POI crashes if the formula is added before this sheet
		// RuntimeException("Zero length string is an invalid sheet name")
		// Excel doesn't crash but the formula doesn't work until it is
		// re-entered

		String inputFormula = "SUMPRODUCT(A!C7:A!C67, B8:B68) / B69"; // as per bug report
		try {
			cell.setCellFormula(inputFormula); 
		} catch (StringIndexOutOfBoundsException e) {
			fail("Identified bug 42448");
		}

		assertEquals("SUMPRODUCT(A!C7:A!C67,B8:B68)/B69", cell.getCellFormula());

		// might as well evaluate the sucker...

		addCell(sheet2, 5, 2, 3.0); // A!C6
		addCell(sheet2, 6, 2, 4.0); // A!C7
		addCell(sheet2, 66, 2, 5.0); // A!C67
		addCell(sheet2, 67, 2, 6.0); // A!C68

		addCell(sheet1, 6, 1, 7.0); // B7
		addCell(sheet1, 7, 1, 8.0); // B8
		addCell(sheet1, 67, 1, 9.0); // B68
		addCell(sheet1, 68, 1, 10.0); // B69

		double expectedResult = (4.0 * 8.0 + 5.0 * 9.0) / 10.0;

		FormulaEvaluator fe = wb.getCreationHelper().createFormulaEvaluator();
		CellValue cv = fe.evaluate(cell);

		assertEquals(CellType.NUMERIC, cv.getCellTypeEnum());
		assertEquals(expectedResult, cv.getNumberValue(), 0.0);

		wb.close();
	}

	private static void addCell(Sheet sheet, int rowIx, int colIx,
			double value) {
		sheet.createRow(rowIx).createCell(colIx).setCellValue(value);
	}

	@Test
	public void test55032() throws IOException {
        Workbook wb = new HSSFWorkbook();
        Sheet sheet = wb.createSheet("input");

        Row row = sheet.createRow(0);
        Cell cell = row.createCell(1);

        checkFormulaValue(wb, cell, "PV(0.08/12, 20*12, 500, ,0)", -59777.14585);
        checkFormulaValue(wb, cell, "PV(0.08/12, 20*12, 500, ,)", -59777.14585);
        checkFormulaValue(wb, cell, "PV(0.08/12, 20*12, 500, 500,)", -59878.6315455);
        
        checkFormulaValue(wb, cell, "FV(0.08/12, 20*12, 500, ,)", -294510.2078107270);
        checkFormulaValue(wb, cell, "PMT(0.08/12, 20*12, 500, ,)", -4.1822003450);
        checkFormulaValue(wb, cell, "NPER(0.08/12, 20*12, 500, ,)", -2.0758873434);

        wb.close();
	}

    private void checkFormulaValue(Workbook wb, Cell cell, String formula, double expectedValue) {
        cell.setCellFormula(formula);
	    
        FormulaEvaluator evaluator = wb.getCreationHelper().createFormulaEvaluator();
        CellValue value = evaluator.evaluate(cell);
        
        assertEquals(expectedValue, value.getNumberValue(), 0.0001);
    }
}