//
// This is a stand-alone example of splitting a PDF into individual pages. It does essentially the
// same thing that qpdf --split-pages does.
//

#include <qpdf/QIntC.hh>
#include <qpdf/QPDF.hh>
#include <qpdf/QPDFPageDocumentHelper.hh>
#include <qpdf/QPDFWriter.hh>
#include <qpdf/QUtil.hh>

#include <cstdlib>
#include <cstring>
#include <iostream>
#include <string>

static bool static_id = false;

static void
process(char const* whoami, char const* infile, std::string outprefix)
{
    QPDF inpdf;
    inpdf.processFile(infile);
    std::vector<QPDFPageObjectHelper> pages = QPDFPageDocumentHelper(inpdf).getAllPages();
    int pageno_len = QIntC::to_int(std::to_string(pages.size()).length());
    int pageno = 0;
    for (auto& page: pages) {
        std::string outfile = outprefix + QUtil::int_to_string(++pageno, pageno_len) + ".pdf";
        QPDF outpdf;
        outpdf.emptyPDF();
        QPDFPageDocumentHelper(outpdf).addPage(page, false);
        QPDFWriter outpdfw(outpdf, outfile.c_str());
        if (static_id) {
            // For the test suite, uncompress streams and use static IDs.
            outpdfw.setStaticID(true); // for testing only
            outpdfw.setStreamDataMode(qpdf_s_uncompress);
        }
        outpdfw.write();
    }
}

void
usage(char const* whoami)
{
    std::cerr << "Usage: " << whoami << " infile outprefix" << std::endl;
    exit(2);
}

int
main(int argc, char* argv[])
{
    char const* whoami = QUtil::getWhoami(argv[0]);

    // For test suite
    if ((argc > 1) && (strcmp(argv[1], " --static-id") == 0)) {
        static_id = true;
        --argc;
        ++argv;
    }

    if (argc != 3) {
        usage(whoami);
    }
    try {
        process(whoami, argv[1], argv[2]);
    } catch (std::exception const& e) {
        std::cerr << whoami << ": exception: " << e.what() << std::endl;
        return 2;
    }
    return 0;
}
