/*
 *  ====================================================================
 *    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,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
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 */

package org.apache.poi.xssf.streaming;

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

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

import org.apache.commons.io.output.UnsynchronizedByteArrayOutputStream;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.junit.jupiter.api.Test;

/**
 * Test creates cells in reverse column order in XSSF and SXSSF and expects
 * saved files to have fixed the order.
 * 
 * This is necessary because if columns in the saved file are out of order
 * Excel will show a repair dialog when opening the file and removing data.
 */
public final class TestOutOfOrderColumns {

    @Test
    void outOfOrderColumnsXSSF() throws IOException {
        try (
                XSSFWorkbook wb = new XSSFWorkbook();
                UnsynchronizedByteArrayOutputStream bos = UnsynchronizedByteArrayOutputStream.builder().get()
        ) {
            XSSFSheet sheet = wb.createSheet();
            
            Row row = sheet.createRow(0);
            // create cells in reverse order
            row.createCell(1).setCellValue("def");
            row.createCell(0).setCellValue("abc");

            wb.write(bos);

            validateOrder(bos.toInputStream());
        }
    }

    @Test
    void outOfOrderColumnsSXSSF() throws IOException {
        try (
                SXSSFWorkbook wb = new SXSSFWorkbook();
                UnsynchronizedByteArrayOutputStream bos = UnsynchronizedByteArrayOutputStream.builder().get()
        ) {
            Sheet sheet = wb.createSheet();
            
            Row row = sheet.createRow(0);
            // create cells in reverse order
            row.createCell(1).setCellValue("xyz");
            row.createCell(0).setCellValue("uvw");
            
            wb.write(bos);

            validateOrder(bos.toInputStream());
        }
    }

    @Test
    /** this is the problematic case, as XSSF column sorting is skipped when saving with SXSSF. */
    void mixOfXSSFAndSXSSF() throws IOException {
        try (
                XSSFWorkbook wb = new XSSFWorkbook();
                UnsynchronizedByteArrayOutputStream bos = UnsynchronizedByteArrayOutputStream.builder().get()
        ) {
            XSSFSheet sheet = wb.createSheet();
            
            Row row1 = sheet.createRow(0);
            // create cells in reverse order
            row1.createCell(1).setCellValue("def");
            row1.createCell(0).setCellValue("abc");

            try (SXSSFWorkbook sxssfWorkbook = new SXSSFWorkbook(wb)) {
                Sheet sSheet = sxssfWorkbook.getSheetAt(0);
                Row row2 = sSheet.createRow(1);
                // create cells in reverse order
                row2.createCell(1).setCellValue("xyz");
                row2.createCell(0).setCellValue("uvw");
                
                sxssfWorkbook.write(bos);

                validateOrder(bos.toInputStream());
            }
        }
    }

    private void validateOrder(InputStream is) throws IOException {
        // test if saved cells are in order
        try (XSSFWorkbook xssfWorkbook = new XSSFWorkbook(is)) {
            XSSFSheet xssfSheet = xssfWorkbook.getSheetAt(0);
            
            Row resultRow = xssfSheet.getRow(0);
            // POI doesn't show stored order because _cells TreeMap sorts it automatically.
            // The only way to test is to compare the xml.
            String s = resultRow.toString();
            assertTrue(s.matches("(?s).*A1.*B1.*"), "unexpected order: " + s);
        }
    }

}