using System.Drawing;
using System.IO;

using EO.Pdf;

namespace EOPdf.Html2PDF.Test
{
    internal class PdfGenerator
    {
        private const int PagePaddingTop = 28;
        private const int PagePaddingBottom = 24;
        private const int PagePaddingLeft = 17;
        private const int PagePaddingRight = 17;

        static PdfGenerator()
        {
        }

        internal static HtmlToPdfResult HtmlToPdfResult(string reportText, string cl0Page, string pageHeader)
        {
            // Define PDF Header
            //Set margins to 0.5 inch on all sides
            var options = new HtmlToPdfOptions
            {
                HeaderHtmlFormat = pageHeader,
                FooterHtmlFormat = "<div style=\"text-align:right;\">" + cl0Page + " {page_number} / {total_pages}</div>",
                AutoBookmark = true,
                // Activate option to repeat header row for data tables.
                RepeatTableHeaderAndFooter = true,
                //ZoomLevel = 1.0f,
                //AutoFitX = HtmlToPdfAutoFitMode.ShrinkToFit,
                AfterRenderPage = PdfGenerator_AfterRenderPage,
                PageSize = PdfPageSizes.A4,
                OutputArea = new RectangleF(MmToInch(PagePaddingLeft), MmToInch(PagePaddingTop), PdfPageSizes.A4.Width - MmToInch(PagePaddingRight + PagePaddingLeft), PdfPageSizes.A4.Height - MmToInch(PagePaddingTop + PagePaddingBottom))
            };

            // remove header and footer at front-page

            var doc = new PdfDocument();
            var result = EO.Pdf.HtmlToPdf.ConvertHtml(reportText, doc, options);
            return result;
        }

        private static float MmToInch(int mm)
        {
            return 0.03937007874015748f * mm;
        }

        /// <summary>
        /// This function is called after every pdf-page is created.
        /// </summary>
        private static void PdfGenerator_AfterRenderPage(object sender, PdfPageEventArgs args)
        {
            if (args.Page.Index == 0)
            {
                // hide header
                // create a div element that will cover up the default header
                const string areaWhiteout = "<div style='background-color:#fff; width:850px; height:155px;'></div>";

                // set the new output area to be over the header
                var options = new HtmlToPdfOptions { OutputArea = new RectangleF(0, 0, 8.5f, 1) };

                // write the white div block over the header
                EO.Pdf.HtmlToPdf.ConvertHtml(areaWhiteout, args.Page.Document.Pages[0], options);
            }
        }
    }
}