using iTextSharp.text;
using iTextSharp.text.html.simpleparser;
using iTextSharp.text.pdf;

using System.IO;

namespace Fab2ApprovalSystem.PdfGenerator;

public class StandardPdfRenderer {

    private const int HorizontalMargin = 40;
    private const int VerticalMargin = 40;

    public static byte[] GetPortableDocumentFormatBytes(string pageTitle, string htmlText) {
        byte[] results;
        using (MemoryStream memoryStream = GetPortableDocumentFormat(pageTitle, htmlText)) {
            results = new byte[memoryStream.Position];
            memoryStream.Position = 0;
            memoryStream.Read(results, 0, results.Length);
        }
        return results;
    }

    public static void WritePortableDocumentFormatToFile(string pageTitle, string htmlText, string path) {
        using (MemoryStream memoryStream = GetPortableDocumentFormat(pageTitle, htmlText)) {
            using (FileStream fileStream = new(path, FileMode.Create)) {
                memoryStream.CopyTo(fileStream);
            }
        }
    }

    public static MemoryStream GetPortableDocumentFormat(string pageTitle, string htmlText) {
        MemoryStream result = new();
        using (Document pdfDocument = new Document(PageSize.A4, HorizontalMargin, HorizontalMargin, VerticalMargin, VerticalMargin)) {
            using (PdfWriter pdfWriter = PdfWriter.GetInstance(pdfDocument, result)) {
                pdfWriter.CloseStream = false;
                pdfWriter.PageEvent = new PrintHeaderFooter { Title = pageTitle };
                pdfDocument.Open();
                using (StringReader htmlViewReader = new StringReader(htmlText)) {
                    using (HTMLWorker htmlWorker = new HTMLWorker(pdfDocument)) {
                        htmlWorker.Parse(htmlViewReader);
                    }
                }
            }
        }
        return result;
    }

}