using DigitalData.Core.Abstraction.Application.Repository;
using EnvelopeGenerator.Domain.Entities;
using MediatR;

namespace EnvelopeGenerator.Application.Common.Notifications.RemoveSignature.Handlers;

/// <summary>
/// 
/// </summary>
public class RemoveAnnotationHandler : INotificationHandler<RemoveSignatureNotification>
{
    private readonly IRepository<ElementAnnotation> _repo;

    /// <summary>
    /// 
    /// </summary>
    /// <param name="repository"></param>
    public RemoveAnnotationHandler(IRepository<ElementAnnotation> repository)
    {
        _repo = repository;
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="notification"></param>
    /// <param name="cancel"></param>
    /// <returns></returns>
    public Task Handle(RemoveSignatureNotification notification, CancellationToken cancel)
    {
        notification.ThrowIfHasNoFilter();
        return _repo.DeleteAsync(annots =>
        {
            // envelope ID filter
            if (notification.EnvelopeId is int envelopeId)
                annots = annots.Where(annot => annot.Element!.Document.EnvelopeId == envelopeId);

            // envelope UUID filter
            if (notification.EnvelopeUuid is string envelopeUuid)
                annots = annots.Where(annot => annot.Element!.Document.Envelope!.Uuid == envelopeUuid);

            // receiver ID
            if (notification.ReceiverId is int receiverId)
                annots = annots.Where(annot => annot.Element!.ReceiverId == receiverId);

            // receiver signature
            if (notification.ReceiverSignature is string receiverSignature)
                annots = annots.Where(annot => annot.Element!.Receiver!.Signature == receiverSignature);

            return annots;
        }, cancel);
    }
}