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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
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       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.tests.extractor;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;

import java.io.IOException;
import java.io.InputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.Base64;
import java.util.List;

import org.apache.poi.EncryptedDocumentException;
import org.apache.poi.POIDataSamples;
import org.apache.poi.hssf.HSSFTestDataSamples;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.extractor.EmbeddedData;
import org.apache.poi.ss.extractor.EmbeddedExtractor;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;
import org.junit.jupiter.api.Test;

class TestEmbeddedExtractor {
    private static final POIDataSamples samples = POIDataSamples.getSpreadSheetInstance();

    @Test
    void extractPDFfromEMF() throws Exception {
        InputStream fis = samples.openResourceAsStream("Basic_Expense_Template_2011.xls");
        Workbook wb = WorkbookFactory.create(fis);
        fis.close();

        EmbeddedExtractor ee = new EmbeddedExtractor();
        List<EmbeddedData> edList = new ArrayList<>();
        for (Sheet s : wb) {
            edList.addAll(ee.extractAll(s));
        }
        wb.close();

        assertEquals(2, edList.size());

        String filename1 = "Sample.pdf";
        EmbeddedData ed0 = edList.get(0);
        assertEquals(filename1, ed0.getFilename());
        assertEquals(filename1, ed0.getShape().getShapeName().trim());
        assertEquals("uNplB1QpYug+LWappiTh0w==", md5hash(ed0.getEmbeddedData()));

        String filename2 = "kalastuslupa_jiyjhnj_yuiyuiyuio_uyte_sldfsdfsdf_sfsdfsdf_sfsssfsf_sdfsdfsdfsdf_sdfsdfsdf.pdf";
        EmbeddedData ed1 = edList.get(1);
        assertEquals(filename2, ed1.getFilename());
        assertEquals(filename2, ed1.getShape().getShapeName().trim());
        assertEquals("QjLuAZ+cd7KbhVz4sj+QdA==", md5hash(ed1.getEmbeddedData()));
    }

    @Test
    void extractFromXSSF() throws IOException, EncryptedDocumentException, InvalidFormatException {
        InputStream fis = samples.openResourceAsStream("58325_db.xlsx");
        Workbook wb = WorkbookFactory.create(fis);
        fis.close();

        EmbeddedExtractor ee = new EmbeddedExtractor();
        List<EmbeddedData> edList = new ArrayList<>();
        for (Sheet s : wb) {
            edList.addAll(ee.extractAll(s));
        }
        wb.close();

        assertEquals(4, edList.size());
        EmbeddedData ed0 = edList.get(0);
        assertEquals("Object 1.pdf", ed0.getFilename());
        assertEquals("Object 1", ed0.getShape().getShapeName().trim());
        assertEquals("Oyys6UtQU1gbHYBYqA4NFA==", md5hash(ed0.getEmbeddedData()));

        EmbeddedData ed1 = edList.get(1);
        assertEquals("Object 2.pdf", ed1.getFilename());
        assertEquals("Object 2", ed1.getShape().getShapeName().trim());
        assertEquals("xLScPUS0XH+5CTZ2A3neNw==", md5hash(ed1.getEmbeddedData()));

        EmbeddedData ed2 = edList.get(2);
        assertEquals("Object 3.pdf", ed2.getFilename());
        assertEquals("Object 3", ed2.getShape().getShapeName().trim());
        assertEquals("rX4klZqJAeM5npb54Gi2+Q==", md5hash(ed2.getEmbeddedData()));

        EmbeddedData ed3 = edList.get(3);
        assertEquals("Microsoft_Excel_Worksheet1.xlsx", ed3.getFilename());
        assertEquals("Object 1", ed3.getShape().getShapeName().trim());
        assertEquals("4m4N8ji2tjpEGPQuw2YwGA==", md5hash(ed3.getEmbeddedData()));
    }

    public static String md5hash(byte[] input) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] hash = md.digest(input);
            return Base64.getEncoder().encodeToString(hash);
        } catch (NoSuchAlgorithmException e) {
            // doesn't happen
            throw new RuntimeException(e);
        }
    }


    @Test
    void testNPE() throws IOException {
        HSSFWorkbook wb = HSSFTestDataSamples.openSampleWorkbook("angelo.edu_content_files_19555-nsse-2011-multiyear-benchmark.xls");
        EmbeddedExtractor ee = new EmbeddedExtractor();

        for (Sheet s : wb) {
            for (EmbeddedData ed : ee.extractAll(s)) {
                assertNotNull(ed.getFilename());
                assertNotNull(ed.getEmbeddedData());
                assertNotNull(ed.getShape());
            }
        }

    }
}