using EnvelopeGenerator.Application.Common.Dto;
using EnvelopeGenerator.Application.DocStatus.Commands;
using EnvelopeGenerator.Application.Signature.Commands;
using EnvelopeGenerator.Domain.Constants;
using MediatR;
using System.Text.Json;

namespace EnvelopeGenerator.Application.Signature.Behaviors;

/// <summary>
/// Pipeline behavior that creates document status.
/// Executes second in the signing process.
/// </summary>
public class DocStatusBehavior : IPipelineBehavior<SignCommand, Unit>
{
    private const string BlankAnnotationJson = "{}";

    private readonly ISender _sender;

    /// <summary>
    /// 
    /// </summary>
    /// <param name="sender"></param>
    public DocStatusBehavior(ISender sender)
    {
        _sender = sender;
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="request"></param>
    /// <param name="next"></param>
    /// <param name="cancellationToken"></param>
    /// <returns></returns>
    public async Task<Unit> Handle(SignCommand request, RequestHandlerDelegate<Unit> next, CancellationToken cancellationToken)
    {
        await _sender.Send(new CreateDocStatusCommand()
        {
            EnvelopeId = request.EnvelopeReceiver.EnvelopeId,
            ReceiverId = request.EnvelopeReceiver.ReceiverId,
            Value = request.PsPdfKitAnnotation is PsPdfKitAnnotation annot
                        ? JsonSerializer.Serialize(annot.Instant, Format.Json.ForAnnotations)
                        : BlankAnnotationJson
        }, cancellationToken);

        return await next();
    }
}