using EnvelopeGenerator.Application.Common.Extensions;
using EnvelopeGenerator.Application.Histories.Commands;
using EnvelopeGenerator.Application.Signatures.Commands;
using EnvelopeGenerator.Domain.Constants;
using MediatR;

namespace EnvelopeGenerator.Application.Signatures.Behaviors;

/// <summary>
/// Pipeline behavior that records history.
/// Executes third in the signing process.
/// </summary>
public class HistoryBehavior : IPipelineBehavior<SigningCommand, Unit>
{
    private readonly ISender _sender;

    /// <summary>
    /// 
    /// </summary>
    /// <param name="sender"></param>
    public HistoryBehavior(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(SigningCommand request, RequestHandlerDelegate<Unit> next, CancellationToken cancellationToken)
    {
        if (request.EnvelopeReceiver.Receiver is null)
            throw new InvalidOperationException($"Receiver information is missing in the notification. SignCommand:\n {request.ToJson(Format.Json.ForDiagnostics)}");

        await _sender.Send(new CreateHistoryCommand()
        {
            EnvelopeId = request.EnvelopeReceiver.EnvelopeId,
            UserReference = request.EnvelopeReceiver.Receiver.EmailAddress,
            Status = EnvelopeStatus.DocumentSigned,
        }, cancellationToken);

        return await next(cancellationToken);
    }
}