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   this work for additional information regarding copyright ownership.
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package org.apache.poi.ss.tests.formula;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;

import org.apache.poi.ss.SpreadsheetVersion;
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.Table;
import org.apache.poi.ss.util.AreaReference;
import org.apache.poi.ss.util.CellReference;
import org.apache.poi.xssf.XSSFTestDataSamples;
import org.apache.poi.xssf.usermodel.*;
import org.junit.jupiter.api.Test;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTTableColumn;

/**
 * Tests Excel Table expressions (structured references)
 * @see <a href="https://support.office.com/en-us/article/Using-structured-references-with-Excel-tables-F5ED2452-2337-4F71-BED3-C8AE6D2B276E">
 *         Excel Structured Reference Syntax
 *      </a>
 */
class TestStructuredReferences {

    /**
     * Test the regular expression used in INDIRECT() evaluation to recognize structured references
     */
    @Test
    void testTableExpressionSyntax() {
        assertTrue(Table.isStructuredReference.matcher("abc[col1]").matches(), "Valid structured reference syntax didn't match expression");
        assertTrue(Table.isStructuredReference.matcher("_abc[col1]").matches(), "Valid structured reference syntax didn't match expression");
        assertTrue(Table.isStructuredReference.matcher("_[col1]").matches(), "Valid structured reference syntax didn't match expression");
        assertTrue(Table.isStructuredReference.matcher("\\[col1]").matches(), "Valid structured reference syntax didn't match expression");
        assertTrue(Table.isStructuredReference.matcher("\\[col1]").matches(), "Valid structured reference syntax didn't match expression");
        assertTrue(Table.isStructuredReference.matcher("\\[#This Row]").matches(), "Valid structured reference syntax didn't match expression");
        assertTrue(Table.isStructuredReference.matcher("\\[ [col1], [col2] ]").matches(), "Valid structured reference syntax didn't match expression");

        // can't have a space between the table name and open bracket
        assertFalse(Table.isStructuredReference.matcher("\\abc [ [col1], [col2] ]").matches(), "Invalid structured reference syntax didn't fail expression");
    }

    @Test
    void testTableFormulas() throws Exception {
        try (XSSFWorkbook wb = XSSFTestDataSamples.openSampleWorkbook("StructuredReferences.xlsx")) {

            final FormulaEvaluator eval = new XSSFFormulaEvaluator(wb);
            final XSSFSheet tableSheet = wb.getSheet("Table");
            final XSSFSheet formulaSheet = wb.getSheet("Formulas");

            confirm(eval, tableSheet.getRow(5).getCell(0), 49);
            confirm(eval, formulaSheet.getRow(0).getCell(0), 209);
            confirm(eval, formulaSheet.getRow(1).getCell(0), "one");

            // test changing a table value, to see if the caches are properly cleared
            // Issue 59814

            // this test passes before the fix for 59814
            tableSheet.getRow(1).getCell(1).setCellValue("ONEA");
            confirm(eval, formulaSheet.getRow(1).getCell(0), "ONEA");

            // test adding a row to a table, issue 59814
            Row newRow = tableSheet.getRow(7);
            if (newRow == null) newRow = tableSheet.createRow(7);
            newRow.createCell(0, CellType.FORMULA).setCellFormula("\\_Prime.1[[#This Row],[@Number]]*\\_Prime.1[[#This Row],[@Number]]");
            newRow.createCell(1, CellType.STRING).setCellValue("thirteen");
            newRow.createCell(2, CellType.NUMERIC).setCellValue(13);

            // update Table
            final XSSFTable table = wb.getTable("\\_Prime.1");
            final AreaReference newArea = wb.getCreationHelper().createAreaReference(
                    table.getStartCellReference(),
                    new CellReference(table.getEndRowIndex() + 1, table.getEndColIndex()));
            String newAreaStr = newArea.formatAsString();
            table.getCTTable().setRef(newAreaStr);
            table.getCTTable().getAutoFilter().setRef(newAreaStr);
            table.updateHeaders();
            table.updateReferences();

            // these fail before the fix for 59814
            confirm(eval, tableSheet.getRow(7).getCell(0), 13 * 13);
            confirm(eval, formulaSheet.getRow(0).getCell(0), 209 + 13 * 13);

        }
    }

    @Test
    void testCellFormulaValidationFalse() throws Exception {
        //relates to https://bz.apache.org/bugzilla/show_bug.cgi?id=66039
        try (XSSFWorkbook workbook = new XSSFWorkbook()) {
            workbook.setCellFormulaValidation(false);
            XSSFSheet sheet = workbook.createSheet();

            //set sheet content
            sheet.createRow(0).createCell(0).setCellValue("Field1");
            sheet.getRow(0).createCell(1).setCellValue("Field2");
            sheet.createRow(1).createCell(0).setCellValue(123);
            sheet.getRow(1).createCell(1);

            //create the table
            String tableName = "Table1";
            CellReference topLeft = new CellReference(sheet.getRow(0).getCell(0));
            CellReference bottomRight = new CellReference(sheet.getRow(1).getCell(1));
            AreaReference tableArea = workbook.getCreationHelper().createAreaReference(topLeft, bottomRight);
            XSSFTable dataTable = sheet.createTable(tableArea);
            dataTable.setName(tableName);
            dataTable.setDisplayName(tableName);

            //set the formula in sheet - when setCellFormulaValidation=true (the default), the code tries to
            //tidy up this formula (but incorrectly, in this case) - gets adjusted to Sheet0!A2:A2
            XSSFCell formulaCell = sheet.getRow(1).getCell(1);
            formulaCell.setCellFormula(tableName + "[[#This Row],[Field1]]");

            assertEquals("Table1[[#This Row],[Field1]]", formulaCell.getCellFormula());
        }
    }

    @Test
    void testBug66215() throws Exception {
        //relates to https://bz.apache.org/bugzilla/show_bug.cgi?id=66215 (this does not work as it should)
        try (XSSFWorkbook workbook = XSSFTestDataSamples.openSampleWorkbook("bug66215.xlsx")) {
            XSSFSheet sheet = workbook.getSheetAt(0);
            XSSFRow row3 = sheet.getRow(3);
            XSSFRow row5 = sheet.getRow(5);
            assertEquals("Tabelle1[[#This Row],[Total]]/Tabelle1[[#Totals],[Total]]", row3.getCell(5).getCellFormula());
            assertEquals("Tabelle1[[#This Row],[Total]]/Tabelle1[[#Totals],[Total]]", row5.getCell(5).getCellFormula());
            XSSFTable table = sheet.getTables().get(0);

            int lastTableRow = table.getEndCellReference().getRow();
            int totalsRowCount = table.getTotalsRowCount();
            int lastTableDataRow = lastTableRow - totalsRowCount;

            // we will add one row in table data
            lastTableRow++;
            lastTableDataRow++;

            // new table area plus one row
            AreaReference newTableArea = new AreaReference(
                    table.getStartCellReference(),
                    new CellReference(
                            lastTableRow,
                            table.getEndCellReference().getCol()
                    ),
                    SpreadsheetVersion.EXCEL2007
            );

            if (totalsRowCount > 0) {
                workbook.setCellFormulaValidation(false);
                sheet.shiftRows(lastTableDataRow, lastTableRow++, 1);
            }

            // set new table area
            table.setArea(newTableArea);

            XSSFRow row4 = sheet.getRow(4);
            //the next formula has been adjusted more than it should but seems to return correct value
            assertEquals("Tabelle2!E5:E5/Tabelle2!E8:E8", row4.getCell(5).getCellFormula());
            XSSFRow row7 = sheet.getRow(7);
            //the next formula is completely wrong (should be the same as the value in the row4 assertion above)
            assertEquals("SUBTOTAL(109,Tabelle1[Percentage])", row7.getCell(5).getCellFormula());

            //correct all sheet table-reference-formulas which probably got damaged after shift rows
            for (CTTableColumn tableCol : table.getCTTable().getTableColumns().getTableColumnList()) {
                if (tableCol.getCalculatedColumnFormula() != null) {
                    int id = Math.toIntExact(tableCol.getId());
                    String formula = tableCol.getCalculatedColumnFormula().getStringValue();
                    int rFirst = table.getStartCellReference().getRow() + table.getHeaderRowCount();
                    int rLast = table.getEndCellReference().getRow() - table.getTotalsRowCount();
                    int c = table.getStartCellReference().getCol() + id - 1;
                    sheet.getWorkbook().setCellFormulaValidation(false);
                    for (int r = rFirst; r <= rLast; r++) {
                        XSSFRow row = sheet.getRow(r);
                        if (row == null) row = sheet.createRow(r);
                        XSSFCell cell = row.getCell(c, Row.MissingCellPolicy.CREATE_NULL_AS_BLANK);
                        cell.setCellFormula(formula);
                    }
                }
            }

            //is it right that this reverts back to Tabelle1 when it was Tabelle2 for the 'correct all sheet table-reference-formulas' loop?
            assertEquals("Tabelle1[[#This Row],[Total]]/Tabelle1[[#Totals],[Total]]", row4.getCell(5).getCellFormula());
            //the next formula is still completely wrong (should be the same as the value in the row4 assertion above)
            assertEquals("SUBTOTAL(109,Tabelle1[Percentage])", row7.getCell(5).getCellFormula());
        }
    }

    private static void confirm(FormulaEvaluator fe, Cell cell, double expectedResult) {
        fe.clearAllCachedResultValues();
        CellValue cv = fe.evaluate(cell);
        assertEquals(CellType.NUMERIC, cv.getCellType(),  "expected numeric cell type but got " + cv.formatAsString());
        assertEquals(expectedResult, cv.getNumberValue(), 0.0);
    }

    private static void confirm(FormulaEvaluator fe, Cell cell, String expectedResult) {
        fe.clearAllCachedResultValues();
        CellValue cv = fe.evaluate(cell);
        assertEquals(CellType.STRING, cv.getCellType(), "expected String cell type but got " + cv.formatAsString());
        assertEquals(expectedResult, cv.getStringValue());
    }
}