//// This code is part of Document Solutions for PDF .NET demos.// Copyright (c) MESCIUS inc. All rights reserved.//using System;using System.IO;using System.Drawing;using System.Linq;using System.Collections.Generic;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.    // Selected portions of the fetched invoice data are printed to the PDF generated by this sample.    // See ZugferdInfoExt for a similar sample that prints out all 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 ZugferdInfo    {        public int CreatePDF(Stream stream)        {            // The sample invoice with ZUGFeRD data:            var invoicePdf = Path.Combine("Resources", "PDFs", "zugferd-invoice.pdf");
            // Text formats for output:            var tfData = new TextFormat() {                Font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "NotoSans-Regular.ttf")),                 FontSize = 12            };            var tfStrong = new TextFormat(tfData) {                Font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "NotoSans-Bold.ttf"))            };            var tfLabels = new TextFormat(tfData) {                Font = GCTEXT.Font.FromFile(Path.Combine("Resources", "Fonts", "NotoSans-Italic.ttf")),                FontSize = 11            };            float margin = 36;
            // 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 culture = CultureInfo.CreateSpecificCulture("en-US");
                        // Print out the invoice data:                        var page = doc.NewPage();                        var g = page.Graphics;                        var tl = g.CreateTextLayout();
                        tl.MaxWidth = page.Size.Width;                        tl.MaxHeight = page.Size.Height;                        tl.MarginAll = margin;
                        // The invoice header:                        tl.Append($"Invoice Number: ", tfLabels);                        tl.AppendLine($"{descriptor.InvoiceNo}", tfData);                        tl.Append($"Invoice Date: ", tfLabels);                        tl.AppendLine($"{descriptor.InvoiceDate.Value:yyyy-MM-dd}", tfData);                        tl.Append($"Seller Name: ", tfLabels);                        tl.AppendLine($"{descriptor.Seller.Name}", tfData);                        tl.Append($"Seller Address: ", tfLabels);                        tl.AppendLine($"{descriptor.Seller.Street}, {descriptor.Seller.City}, {descriptor.Seller.Postcode}, {descriptor.Seller.Country}", tfData);                        tl.Append($"Buyer Name: ", tfLabels);                        tl.AppendLine($"{descriptor.BuyerContact.Name} {descriptor.Buyer.Name}", tfData);                        tl.Append($"Buyer Address: ", tfLabels);                        tl.AppendLine($"{descriptor.Buyer.Street}, {descriptor.Buyer.City}, {descriptor.Buyer.Postcode}, {descriptor.Buyer.Country}", tfData);                        tl.AppendLine();
                        // The invoice positions:                        tl.TabStops = new List<TabStop>()                        {                            new TabStop(margin, TabStopAlignment.Leading),                            new TabStop(page.Size.Width - margin * 2 - 144, TabStopAlignment.Trailing),                            new TabStop(page.Size.Width - margin * 2, TabStopAlignment.Trailing),                        };                        decimal totals = 0;                        var index = 1;                        tl.AppendLine("#\tName\tQuantity\tAmount", tfLabels);                        descriptor.TradeLineItems.ForEach(it =>                        {                            tl.AppendLine($"{index++}\t{it.Name}\t{Convert.ToInt32(it.BilledQuantity)}\t{it.LineTotalAmount.Value.ToString("C", culture)}", tfData);                            totals += it.LineTotalAmount.Value;                        });                        // The invoice total:                        tl.AppendLine($"\tTOTAL:\t\t{totals.ToString("C", culture)}", tfStrong);
                        g.DrawTextLayout(tl, PointF.Empty);
                        // Done:                        doc.Save(stream);                        return doc.Pages.Count;                    }                }                else                    return 0;            }        }    }}