using MediatR;
using EnvelopeGenerator.Application.Common.Dto;
using EnvelopeGenerator.Application.Common.Dto.EnvelopeReceiver;
using EnvelopeGenerator.Application.Common.Extensions;
using EnvelopeGenerator.Domain.Constants;

namespace EnvelopeGenerator.Application.Signatures.Commands;

/// <summary>
/// Command to sign a document by a receiver.
/// </summary>
public record SignCommand : IRequest
{
    /// <summary>
    /// The envelope receiver information.
    /// </summary>
    public required EnvelopeReceiverDto EnvelopeReceiver { get; init; }

    /// <summary>
    /// The PSPDFKit annotation data.
    /// </summary>
    [Obsolete("This notification is deprecated. Use Signature.Commands.SignCommand instead.")]
    public PsPdfKitAnnotation? PsPdfKitAnnotation { get; init; }

    /// <summary>
    /// Gets the email address of the receiver.
    /// </summary>
    public string EmailAddress => EnvelopeReceiver.Receiver?.EmailAddress
        ?? throw new InvalidOperationException($"Receiver is null." +
            $"DocSignedNotification:\n{this.ToJson(Format.Json.ForDiagnostics)}");
}

/// <summary>
/// Handles the sign command. The actual work is done by SignCommandBehavior pipeline.
/// </summary>
public class SignCommandHandler : IRequestHandler<SignCommand>
{
    /// <summary>
    /// Executes the signing command. Pipeline behaviors handle the actual processing.
    /// </summary>
    /// <param name="request"></param>
    /// <param name="cancellationToken"></param>
    /// <returns></returns>
    public Task Handle(SignCommand request, CancellationToken cancellationToken = default)
    {
        return Task.CompletedTask;
    }
}