Merge Multiple HTML to PDF

using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using Microsoft.AspNetCore.Mvc;
using HiQPdf_Next_AspNetDemo.Models;

using HiQPdf.Next;

namespace HiQPdf_Next_AspNetDemo.Controllers
{
    public class MergeMultipleHtmlToPdfController : Controller
    {
        public IActionResult Index()
        {
            var model = new MergeMultipleHtmlToPdfViewModel();
            return View(model);
        }

        [HttpPost]
        public ActionResult MergePdf(MergeMultipleHtmlToPdfViewModel model)
        {
            if (!ModelState.IsValid)
            {
                var errorMessage = ModelStateHelper.GetModelErrors(ModelState);
                throw new ValidationException(errorMessage);
            }

            // Replace the demo serial number with the serial number received upon purchase
            // to run the converter in licensed mode
            Licensing.SerialNumber = "YCgJMTAE-BiwJAhIB-EhlWTlBA-UEBRQFBA-U1FOUVJO-WVlZWQ==";

            // Create PDF merger
            using PdfMerge pdfMerge = new PdfMerge();

            // Set PDF merge options
            SetPdfMergeOptions(pdfMerge, model);

            // Create the list of URLs to convert
            List<string> urlsToConvert = new List<string>() {
                model.Url1,
                model.Url2
            };

            foreach (string url in urlsToConvert)
            {
                // Create the HTML to PDF Converter
                HtmlToPdf htmlToPdfConverter = new HtmlToPdf();

                // Set the HTML to PDF Converter options
                SetHtmlToPdfConverterOptions(htmlToPdfConverter, model);

                if (model.GenerateToc)
                {
                    // adjust second TOC page numbers with the number of PDF pages generated by previous conversions
                    htmlToPdfConverter.Document.TableOfContents.PageNumbersOffset = pdfMerge.PdfMergeInfo.TotalPagesProduced;
                }

                // Convert HTML to PDF
                byte[] pdfBytes = htmlToPdfConverter.ConvertUrlToMemory(url);

                // Add the PDF to the merger
                int firstPdfPageCount = pdfMerge.AddPdf(pdfBytes);
            }

            // Merge the PDF documents
            byte[] mergedPdf = pdfMerge.Save();

            // Send the merged PDF file to browser
            FileResult fileResult = new FileContentResult(mergedPdf, "application/pdf");
            fileResult.FileDownloadName = "Merge_Multipe_HTML.pdf";

            return fileResult;
        }

        private void SetHtmlToPdfConverterOptions(HtmlToPdf htmlToPdfConverter, MergeMultipleHtmlToPdfViewModel model)
        {
            // set browser width
            htmlToPdfConverter.BrowserWidth = model.BrowserWidth;

            // set browser height if specified, otherwise use the default
            if (model.BrowserHeight.HasValue)
                htmlToPdfConverter.BrowserHeight = model.BrowserHeight.Value;

            // set browser zoom
            htmlToPdfConverter.BrowserZoom = model.BrowserZoom;

            // Set an additional delay, in seconds, to wait for asynchronous content after the initial load
            // The default value is 0
            htmlToPdfConverter.WaitBeforeConvert = model.WaitTime;

            // Set the maximum time, in seconds, to wait for the HTML page to load
            // The default value is 120 seconds
            htmlToPdfConverter.HtmlLoadedTimeout = model.LoadHtmlTimeout;

            // Automatically resize the PDF page width to match the BrowserWidth property
            // The default value is true
            htmlToPdfConverter.Document.AutoResizePdfPageWidth = model.AutoResizePdfPageWidth;

            // Set the PDF page size, which can be a predefined size like A4 or a custom size in points
            // The default is A4
            // Important Note: The PDF page width is automatically determined from the BrowserWidth
            // when the AutoResizePdfPageWidth property is true
            htmlToPdfConverter.Document.PageSize = GetSelectedPageSize(model.PageSize);

            // Set the PDF page orientation to Portrait or Landscape. The default is Portrait
            htmlToPdfConverter.Document.PageOrientation = GetSelectedPageOrientation(model.PageOrientation);

            // Set the PDF page margins in points. The default is 0
            htmlToPdfConverter.Document.Margins = new PdfMargins(
                        model.LeftMargin, model.RightMargin,
                        model.TopMargin, model.BottomMargin);

            // Enable the creation of a hierarchy of bookmarks from H1 to H6 tags
            htmlToPdfConverter.Document.GenerateDocumentOutline = model.AutoBookmarks;

            // Enable or disable the automatic creation of a table of contents in the PDF document based on H1 to H6 HTML tags
            htmlToPdfConverter.Document.GenerateTableOfContents = model.GenerateToc;
        }

        private void SetPdfMergeOptions(PdfMerge pdfMerge, MergeMultipleHtmlToPdfViewModel model)
        {
            // set the document security
            pdfMerge.Security.OpenPassword = model.OpenPassword;
            pdfMerge.Security.AllowPrinting = model.AllowPrinting;
        }

        private PdfPageSize GetSelectedPageSize(string pageSize)
        {
            switch (pageSize)
            {
                case "A0":
                    return PdfPageSize.A0;
                case "A1":
                    return PdfPageSize.A1;
                case "A10":
                    return PdfPageSize.A10;
                case "A2":
                    return PdfPageSize.A2;
                case "A3":
                    return PdfPageSize.A3;
                case "A4":
                    return PdfPageSize.A4;
                case "A5":
                    return PdfPageSize.A5;
                case "A6":
                    return PdfPageSize.A6;
                case "A7":
                    return PdfPageSize.A7;
                case "A8":
                    return PdfPageSize.A8;
                case "A9":
                    return PdfPageSize.A9;
                case "ArchA":
                    return PdfPageSize.ArchA;
                case "ArchB":
                    return PdfPageSize.ArchB;
                case "ArchC":
                    return PdfPageSize.ArchC;
                case "ArchD":
                    return PdfPageSize.ArchD;
                case "ArchE":
                    return PdfPageSize.ArchE;
                case "B0":
                    return PdfPageSize.B0;
                case "B1":
                    return PdfPageSize.B1;
                case "B2":
                    return PdfPageSize.B2;
                case "B3":
                    return PdfPageSize.B3;
                case "B4":
                    return PdfPageSize.B4;
                case "B5":
                    return PdfPageSize.B5;
                case "Flsa":
                    return PdfPageSize.Flsa;
                case "HalfLetter":
                    return PdfPageSize.HalfLetter;
                case "Ledger":
                    return PdfPageSize.Ledger;
                case "Legal":
                    return PdfPageSize.Legal;
                case "Letter":
                    return PdfPageSize.Letter;
                case "Letter11x17":
                    return PdfPageSize.Letter11x17;
                case "Note":
                    return PdfPageSize.Note;
                default:
                    return PdfPageSize.A4;
            }
        }

        private PdfPageOrientation GetSelectedPageOrientation(string pageOrientation)
        {
            return pageOrientation == "Portrait" ?
                PdfPageOrientation.Portrait : PdfPageOrientation.Landscape;
        }
    }
}