window.ctMaxUploadFiles = 50;
    var _ctImgPdfQueue = [];
    var _ctImgPdfTimer = null;

    function _ctImgPdfMime(name) {
        var ext = ((name || '').toLowerCase().split('.').pop());
        switch (ext) {
            case 'jpg': case 'jpeg': return 'image/jpeg';
            case 'png':  return 'image/png';
            case 'webp': return 'image/webp';
            case 'gif':  return 'image/gif';
            case 'bmp':  return 'image/bmp';
            default:     return '';
        }
    }

    function _ctImgToPdfBytes(blob, fileName) {
        return new Promise(function(resolve, reject) {
            var fr = new FileReader();
            fr.onload = function(e) {
                var bytes = new Uint8Array(e.target.result);
                var ext = ((fileName || '').toLowerCase().split('.').pop());
                if (ext === 'jpg' || ext === 'jpeg') {
                    resolve({ bytes: bytes, type: 'jpg' });
                    return;
                }
                if (ext === 'png') {
                    resolve({ bytes: bytes, type: 'png' });
                    return;
                }
                // Decode other formats to a PNG canvas first.
                var img = new Image();
                img.onload = function() {
                    var c = document.createElement('canvas');
                    c.width = img.naturalWidth;
                    c.height = img.naturalHeight;
                    c.getContext('2d').drawImage(img, 0, 0);
                    c.toBlob(function(pngBlob) {
                        var fr2 = new FileReader();
                        fr2.onload = function(ev) { resolve({ bytes: new Uint8Array(ev.target.result), type: 'png' }); };
                        fr2.onerror = reject;
                        fr2.readAsArrayBuffer(pngBlob);
                    }, 'image/png');
                };
                img.onerror = function(){ reject(new Error('Could not decode ' + fileName)); };
                img.src = URL.createObjectURL(blob);
            };
            fr.onerror = reject;
            fr.readAsArrayBuffer(blob);
        });
    }

    function _ctRunImagesToPdf(files) {
        if (!files || !files.length) return;
        loadScriptPromise('https://cdn.jsdelivr.net/npm/pdf-lib@1.17.1/dist/pdf-lib.min.js').then(async function() {
            try {
                var pdfDoc = await PDFLib.PDFDocument.create();
                for (var i = 0; i < files.length; i++) {
                    var item = files[i];
                    var embed = await _ctImgToPdfBytes(item.blob, item.name);
                    var image = (embed.type === 'jpg')
                        ? await pdfDoc.embedJpg(embed.bytes)
                        : await pdfDoc.embedPng(embed.bytes);
                    var page = pdfDoc.addPage([image.width, image.height]);
                    page.drawImage(image, { x: 0, y: 0, width: image.width, height: image.height });
                }
                var bytes = await pdfDoc.save();
                var first = files[0] && files[0].name ? files[0].name : 'images';
                var base = first.replace(/\.[^.]+$/, '');
                add_file_output(URL.createObjectURL(new Blob([bytes], { type: 'application/pdf' })), base + '.pdf');
            } catch (err) {
                alert('Could not build the PDF: ' + (err && err.message || err));
            }
        }).catch(function() { alert('Could not load the PDF library.'); });
    }

    function processFiles(files) {
        var batch = [];
        for (var i = 0; i < files.length; i++) {
            batch.push({ blob: files[i], name: files[i].name || ('image-' + (i + 1) + '.png') });
        }
        _ctRunImagesToPdf(batch);
    }

    function processFile(blob, fileName) {
        _ctImgPdfQueue.push({ blob: blob, name: fileName || 'image.png' });
        if (_ctImgPdfTimer) clearTimeout(_ctImgPdfTimer);
        _ctImgPdfTimer = setTimeout(function() {
            var batch = _ctImgPdfQueue.slice(0);
            _ctImgPdfQueue = [];
            _ctRunImagesToPdf(batch);
        }, 180);
    }







var _loadedScripts = {};
function loadScriptPromise(url) {
    if (_loadedScripts[url]) return _loadedScripts[url];
    _loadedScripts[url] = new Promise(function (resolve, reject) {
        var s = document.createElement('script');
        s.src = url;
        s.onload = resolve;
        s.onerror = reject;
        document.head.appendChild(s);
    });
    return _loadedScripts[url];
}

function replaceAll(find, replace, str) {
    return str.replace(new RegExp(find, 'g'), replace);
}

function beautify(str) {


    var result = '';

    var length = str.length;

    var i = 0;

    var braceCountLeft = 0;
    var braceCountRight = 0;

    var withinQuotes = false;

    while (i < length) {

        var c = str[i];

        if (c == '"' && (i == 0 || c[i - 1] != '\\')) {
            // non-escaped quotes
            withinQuotes = !withinQuotes;
        }

        if (!withinQuotes && (c == '}' || c == '{' || c == ',')) {

            console.log('Start####' + result);

            // look back and remove carriage returns and whitespace that are already there

            var resultIndex = result.length - 1;
            while (resultIndex >= 0 && (result[resultIndex] == ' ' || result[resultIndex] == '\r' || result[resultIndex] == '\n' || result[resultIndex] == '\t')) {

                resultIndex = resultIndex - 1;
                result = result.substr(0, resultIndex + 1);

                console.log('char ' + result[resultIndex] + '-----' + result + 'zzz ' + result.length + ' ' + resultIndex);

            }


            if (c == '{') {
                braceCountLeft++;
                result += c + '\r' + GetTabs(braceCountLeft - braceCountRight);
            } else if (c == '}') {
                braceCountRight++;
                // precede with carriage return
                result += '\r' + GetTabs(braceCountLeft - braceCountRight) + c;
            } else if (c == ',') {
                result += c + '\r' + GetTabs(braceCountLeft - braceCountRight);
            }

            var nextChar = '';

            // advance through whitespace and remove carriage returns that are already there
            while (i < length && (str[i + 1] == ' ' || str[i + 1] == '\r' || str[i + 1] == '\n' || str[i + 1] == '\t')) {
                i++;
            }

        } else {

            result += str[i];

        }


        i++;

    }

    return result;

}

function GetTabs(count) {

    var result = '';

    for (var i = 0; i < count; i++) {
        result += '    ';
    }

    return result;

}