'use strict'

const gs = require('ghostscript4js')

const { PDFDocument, StandardFonts, rgb, degrees } = require('pdf-lib');
const fs = require('fs');

run().catch(err => console.log(err));

async function run() {
    const content = await PDFDocument.load(fs.readFileSync('./go-thestdlib-sample.pdf'), { ignoreEncryption: true });

    // Add a font to the doc
    const helveticaFont = await content.embedFont(StandardFonts.Helvetica);

    let img = fs.readFileSync('./foto.png');
    img = await content.embedPng(img);
    const jpgDims = img.scale(0.2)


    // Begin Split File
    const doc = await PDFDocument.create();
    const viewerPrefs = content.catalog.getOrCreateViewerPreferences();
    viewerPrefs.setHideToolbar(true);
    viewerPrefs.setDisplayDocTitle(false);
    viewerPrefs.setHideMenubar(true);

    const halaman = [];
    console.log(content.getPageCount(), 'Total Halaman');
    let removePage = Math.round(content.getPageCount() * .2);
    removePage = removePage < 10 ? 10 : removePage > 30 ? 30 : removePage;

    console.log(removePage, 'Halaman');

    const totalPages = content.getPageCount();
    for (let index = removePage; index < totalPages; index++) {
        halaman.push(index);
        content.removePage(removePage);
    }
    console.log(halaman);
    const newPage = await doc.copyPages(content, halaman);

    newPage.forEach(element => {
        doc.addPage(element);
    });
    // End of Split file

    // Draw a number at the bottom of each page.
    // Note that the bottom of the page is `y = 0`, not the top
    const pages = await content.getPages();

    // const { width, height } = img.scale(1);
    for (const [i, page] of Object.entries(pages)) {
        if (i > 0) {
            page.drawText(
                // `Halaman: ${i} --- @Sinau Edukasi --- ${(new Date()).toLocaleString()}`,
                `FreeBook: @Moco - ${(new Date()).toLocaleString()}`,
                {
                    x: 20,
                    y: 30,
                    size: 10,
                    font: helveticaFont,
                    color: rgb(0, 0, 0),
                    rotate: degrees(90)
                }
            );

             page.drawText(
                `FreeBook - Sample\n\n Print @${(new Date()).toLocaleString()}`,
                {
                    x: (page.getWidth() / 2) - (page.getWidth() / 4),
                    y: page.getHeight() / 4,
                    size: 40,
                    font: helveticaFont,
                    color: rgb(0, 0, 0),
                    rotate: degrees(45),
                    opacity: .3
                }
            );
        }

        // page.drawImage(img, {
        //     // x: 25,
        //     // y: 25,
        //     x: Math.floor(Math.random() * (width - 100) + width / 2),
        //     y: Math.floor(Math.random() * (height - 140) + height / 2),
        //     width: jpgDims.width,
        //     height: jpgDims.height,
        //     rotate: degrees(30),
        //     opacity: 0.3,
        // })
    }

    // Write the PDF to a file
    fs.writeFileSync('./halaman.pdf', await content.save());

    const inputFile = './halaman.pdf';
    const outputFilePath = Date.now() + "-output.pdf";

    await gs.executeSync(
        `gs
      \ -q -dNOPAUSE -dBATCH -dSAFER
        -dPrinted=false
        -dDownsampleColorImages=true
        -dDownsampleGrayImages=true
        -dDownsampleMonoImages=true
        -r144
      \ -sDEVICE=pdfwrite
      \ -dCompatibilityLevel=1.4
      \ -dPDFSETTINGS=/ebook
      \ -dEmbedAllFonts=true
      \ -dSubsetFonts=true
      \ -dAutoRotatePages=/None
      \ -dColorImageDownsampleType=/Bicubic
      \ -dColorImageResolution=144
      \ -dGrayImageDownsampleType=/Bicubic
      \ -dGrayImageResolution=144
      \ -dMonoImageDownsampleType=/Subsample
      \ -dMonoImageResolution=144
        -dColorImageDownsampleThreshold=1.0
        -dGrayImageDownsampleThreshold=1.0
        -dMonoImageDownsampleThreshold=1.0
      \ -sOutputFile=${outputFilePath}
      \ ${inputFile}`
    );

    console.log('Proses Selesai')
}