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   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
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       http://www.apache.org/licenses/LICENSE-2.0

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   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.eval;

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

import junit.framework.AssertionFailedError;
import junit.framework.TestCase;

import org.apache.poi.hssf.HSSFTestDataSamples;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFFormulaEvaluator;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.CellValue;

/**
 * Miscellaneous tests for bugzilla entries.<p/> The test name contains the
 * bugzilla bug id.
 * 
 * 
 * @author Josh Micich
 */
public final class TestFormulaBugs extends TestCase {

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

		HSSFSheet sheet = wb.getSheetAt(0);
		HSSFRow row = sheet.getRow(1);
		HSSFCell 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
		HSSFFormulaEvaluator fe = new HSSFFormulaEvaluator(wb);
		CellValue cv = fe.evaluate(cell);

		assertEquals(HSSFCell.CELL_TYPE_NUMERIC, cv.getCellType());
		assertEquals(3.0, cv.getNumberValue(), 0.0);
	}

	/**
	 * Bug 27405 - isnumber() formula always evaluates to false in if statement<p/>
	 * 
	 * seems to be a duplicate of 24925
	 */
	public void test27405() {

		HSSFWorkbook wb = new HSSFWorkbook();
		HSSFSheet sheet = wb.createSheet("input");
		// input row 0
		HSSFRow row = sheet.createRow(0);
		HSSFCell cell = row.createCell(0);
		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
		HSSFFormulaEvaluator fe = new HSSFFormulaEvaluator(wb);
		CellValue cv;
		cv = fe.evaluate(cell);
		assertEquals(HSSFCell.CELL_TYPE_NUMERIC, cv.getCellType());
		assertEquals(1.0, cv.getNumberValue(), 0.0);
		
		cv = fe.evaluate(row.getCell(1));
		assertEquals(HSSFCell.CELL_TYPE_BOOLEAN, cv.getCellType());
		assertEquals(true, cv.getBooleanValue());
	}

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

		HSSFRow row = sheet1.createRow(0);
		HSSFCell cell = row.createCell(0);

		// it's important to create the referenced sheet first
		HSSFSheet 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) {
			throw new AssertionFailedError("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;

		HSSFFormulaEvaluator fe = new HSSFFormulaEvaluator(wb);
		CellValue cv = fe.evaluate(cell);

		assertEquals(HSSFCell.CELL_TYPE_NUMERIC, cv.getCellType());
		assertEquals(expectedResult, cv.getNumberValue(), 0.0);
	}

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