package jnpf.bizcommon.onlyoffice.service.impl;

import jnpf.bizcommon.onlyoffice.entity.OnlyOfficeProperties;
import jnpf.exception.DataException;
import org.apache.pdfbox.Loader;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.junit.Test;

import java.io.ByteArrayOutputStream;
import java.util.List;

import static org.junit.Assert.assertEquals;

public class OnlyOfficeDmsPrintPdfMergerTest {
    @Test
    public void mergesCopiesInRequestOrder() throws Exception {
        OnlyOfficeProperties properties = new OnlyOfficeProperties();
        byte[] merged = new OnlyOfficeDmsPrintPdfMerger(properties).merge(
                List.of(pdf(500), pdf(600)));

        try (PDDocument document = Loader.loadPDF(merged)) {
            assertEquals(2, document.getNumberOfPages());
            assertEquals(500, document.getPage(0).getMediaBox().getWidth(), 0.01);
            assertEquals(600, document.getPage(1).getMediaBox().getWidth(), 0.01);
        }
    }

    @Test(expected = DataException.class)
    public void rejectsMergedPageCountBeyondConfiguredLimit() throws Exception {
        OnlyOfficeProperties properties = new OnlyOfficeProperties();
        properties.getDmsPrint().setMaxPages(1);

        new OnlyOfficeDmsPrintPdfMerger(properties).merge(List.of(pdf(500), pdf(600)));
    }

    private byte[] pdf(float width) throws Exception {
        try (PDDocument document = new PDDocument();
             ByteArrayOutputStream output = new ByteArrayOutputStream()) {
            document.addPage(new PDPage(new PDRectangle(width, 800)));
            document.save(output);
            return output.toByteArray();
        }
    }
}