DRAB/Drab.Logic/Services/PrintService.cs

using Drab.Core.Configuration;
using Drab.Logic.Interfaces;
using Drab.Logic.Models;
using PdfiumViewer;
using System;
using System.Collections.Generic;
using System.Drawing.Printing;
using System.IO;
using System.Linq;
using System.Printing;
using System.Threading.Tasks;

namespace Drab.Logic.Services;

public class PrintService : IPrintService
{
    private readonly IDrabSettings _drabSettings;

    public PrintService(IDrabSettings drabSettings)
    {
        _drabSettings = drabSettings;
    }

    public async Task<PrintDocumentResult> PrintPdf(PrintDocumentRequest request)
    {
        try
        {
            var oldJobs = GetPrintJobs(request.DokId.ToString());
            if (oldJobs.Any(x => !x.IsRetained))
            {
                oldJobs.ForEach(x => x.Cancel());
                await Task.Delay(TimeSpan.FromSeconds(2));
            }

            var (filePath, dokId) = request;
            using (var document = PdfDocument.Load(filePath))
            {
                using (var printDocument = document.CreatePrintDocument())
                {
                    var fileName = Path.GetFileName(filePath);

                    printDocument.PrinterSettings.PrintFileName = fileName;
                    printDocument.DocumentName = dokId.ToString();
                    printDocument.PrintController = new StandardPrintController();
                    printDocument.Print();
                }
            }

            await Task.Delay(TimeSpan.FromSeconds(_drabSettings.PrinterTimeoutSeconds));

            var jobs = GetPrintJobs(request.DokId.ToString());
            if (jobs.Count == 0)
                return new PrintDocumentResult(true, "Print success.");

            jobs.ForEach(x => x.Cancel());
            return new PrintDocumentResult(false, "Print failed - timeout expired.");
        }
        catch (Exception e)
        {
            return new PrintDocumentResult(false, $"Print failed - {e.Message}");
        }
    }

    private static List<PrintSystemJobInfo> GetPrintJobs(string jobName)
    {
        var printQueue = LocalPrintServer.GetDefaultPrintQueue();
        return printQueue.GetPrintJobInfoCollection()
            .Where(x => x.Name == jobName)
            .ToList();
    }
}