EnvelopeGenerator/EnvelopeGenerator.Application/Pdf/Behaviors/WritePdfBehavior.cs

#if WINDOWS
using EnvelopeGenerator.Application.Configs;
using MediatR;
using Microsoft.Extensions.Logging;

namespace EnvelopeGenerator.Application.Pdf.Behaviors;

/// <summary>
/// 
/// </summary>
public class WritePdfBehavior : IPipelineBehavior<BurnPdfCommand, byte[]>
{
    private readonly ISender _sender;

    private readonly ILogger<WritePdfBehavior> _logger;

    /// <summary>
    /// 
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="logger"></param>
    public WritePdfBehavior(ISender sender, ILogger<WritePdfBehavior> logger)
    {
        _sender = sender;
        _logger = logger;
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="request"></param>
    /// <param name="next"></param>
    /// <param name="cancel"></param>
    /// <returns></returns>
    public async Task<byte[]> Handle(BurnPdfCommand request, RequestHandlerDelegate<byte[]> next, CancellationToken cancel)
    {
        var docResult = await next(cancel);

        var config = await _sender.ReadDefaultConfigAsync(cancel);

        var exportPath = config.ExportPath ?? throw new InvalidOperationException(nameof(WritePdfBehavior) + " is not possible."
            + "No export path found in config table.");

        var dirPath = Path.Combine(exportPath, request.Envelope!.Uuid);

        _logger.LogDebug("dirPath is {dirPath}", dirPath);

        if (!Directory.Exists(dirPath))
        {
            _logger.LogDebug("Directory not existing. Creating ...");
            Directory.CreateDirectory(dirPath);
        }

        var outputFilePath = Path.Combine(dirPath, $"{request.Envelope.Uuid}.pdf");

        _logger.LogDebug("Writing finalized Pdf to disk..");
        _logger.LogInformation("Output path is {outputFilePath}", outputFilePath);

        await File.WriteAllBytesAsync(outputFilePath, docResult, cancel);

        return docResult;
    }
}
#endif