//// This code is part of Document Solutions for PDF .NET demos.// Copyright (c) MESCIUS inc. All rights reserved.//using System.IO;using System.Drawing;using System.Reflection;using System.Collections.Generic;using System.Linq;using System.Globalization;using GrapeCity.Documents.Pdf;using GrapeCity.Documents.Text;using s2industries.ZUGFeRD;using GCTEXT = GrapeCity.Documents.Text;using GCDRAW = GrapeCity.Documents.Drawing;
namespace DsPdfWeb.Demos{    // This sample demonstrates how to retrieve invoice data from a ZUGFeRD compliant XML attachment.    // All ZUGFeRD data is printed to the PDF generated by this sample.    // See ZugferdInfo for a similar sample that prints selected portions of the ZUGFeRD data.
    // The sample PDF invoice containing ZUGFeRD data which this sample uses as input    // was generated by ZugferdInvoice.    //    // ZUGFeRD is a German e-invoicing standard based around PDF and XML file formats.    // Its poised to change the way invoices are handled and can be used by any sort of business.    // It will make invoice processing more efficient for senders and customers.    // For details please see www.ferd-net.de.    //    // This sample uses the ZUGFeRD-csharp package    // to parse the ZUGFeRD-compatible XML that is attached to the invoice.    public class ZugferdInfoExt    {        public void CreatePDF(Stream stream)        {            // The sample invoice with ZUGFeRD data:            var invoicePdf = Path.Combine("Resources", "PDFs", "zugferd-invoice.pdf");
            // Output document:            var doc = new GcPdfDocument();            using (FileStream fs = File.OpenRead(invoicePdf))            {                // Load the ZUGFeRD compliant invoice PDF:                var invoice = new GcPdfDocument();                invoice.Load(fs);
                // Get the ZUGFeRD attachment from the invoice by the ZUGFeRD 1.x standard file name:                var attachment = invoice.EmbeddedFiles.Values.FirstOrDefault(it => it.File.FileName == "ZUGFeRD-invoice.xml");                if (attachment != null)                {                    using (var xmlstream = attachment.GetStream())                    {                        // Load the invoice descriptor:                        var descriptor = InvoiceDescriptor.Load(xmlstream);
                        var tl = new TextLayout(72);                        tl.MaxWidth = doc.PageSize.Width;                        tl.MaxHeight = doc.PageSize.Height;                        tl.MarginAll = tl.Resolution;                        tl.DefaultTabStops = 24;
                        // Recursively render all InvoiceDescriptor properties to text layout:                        tl.AppendLine($"{nameof(InvoiceDescriptor)}:", _tfStrong);                        RenderProperties(descriptor, tl, 1);
                        // Write text layout to output PDF                        tl.PerformLayout(true);                        var to = new TextSplitOptions(tl);                        while (true)                        {                            var splitResult = tl.Split(to, out TextLayout rest);                            doc.Pages.Add().Graphics.DrawTextLayout(tl, PointF.Empty);                            if (splitResult != SplitResult.Split)                                break;                            tl = rest;                        }                        // Done:                        doc.Save(stream);                    }                }            }        }
        // Recursively print all source's properties to text layout:        private static void RenderProperties(object source, TextLayout tl, int level)        {            if (source == null)                return;
            var props = source.GetType().GetProperties();            foreach (var prop in props)                RenderProperty(prop, source, tl, level);        }
        // Text formats for output:        private static readonly TextFormat _tfData = new TextFormat() {            Font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "NotoSans-Regular.ttf")),            FontSize = 12        };        private static readonly TextFormat _tfStrong = new TextFormat(_tfData) {            Font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "NotoSans-Bold.ttf"))        };        private static readonly TextFormat _tfLabels = new TextFormat(_tfData) {            Font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "NotoSans-Italic.ttf")),            FontSize = 11        };
        // Print a property:        private static void RenderProperty(PropertyInfo property, object parent, TextLayout tl, int level)        {            var space = string.Empty;            for (int i = 0; i < level; ++i)                space += "\t";            var name = property.Name;            var value = property.GetValue(parent, null);            if (value == null)            {                tl.Append(space, _tfLabels);                tl.AppendLine($"{name}:", _tfLabels);            }            else if (value.GetType().IsValueType || value is string)            {                tl.Append(space, _tfLabels);                tl.Append($"{name}: ", _tfLabels);                tl.AppendLine(string.Format(CultureInfo.GetCultureInfo("en-US"), "{0}", value), _tfData);            }            else            {                if (value is IEnumerable<object> collection)                {                    var index = 0;                    foreach (var item in collection)                    {                        tl.Append(space, _tfLabels);                        tl.AppendLine($"Collection item {name} [{index++}]:", _tfStrong);                        RenderProperties(item, tl, level + 1);                    }                }                else                {                    tl.Append(space, _tfLabels);                    tl.AppendLine($"Container {name}:", _tfStrong);                    RenderProperties(value, tl, level + 1);                }            }        }    }}