messengerapi/code/MessengerApi/Handlers/Endpoint/ReceiveEndpointHandler.cs

using MessengerApi.Contracts.Models.Scoped;
using MessengerApi.Db.Entities;
using MessengerApi.Models.Scoped;

namespace MessengerApi.Handlers.Endpoint
{
    public class ReceiveEndpointHandler
    {
        private readonly ILogger logger;

        private readonly Timing timing;
        private readonly Identity identity;
        private readonly IUnitOfWork unitOfWork;

        public ReceiveEndpointHandler(
            ILogger logger,
            Timing timing,
            Identity identity,
            IUnitOfWork unitOfWork)
        {
            this.logger = logger;
            this.timing = timing;
            this.identity = identity;
            this.unitOfWork = unitOfWork;
        }

        public Task<Message[]> ReceiveMessages()
        {
            var pendingMessages = this.unitOfWork.Messages.GetPendingMessages(this.identity.User);

            this.logger.Debug($"[{this.timing.Timestamp:s}] User {this.identity.User.Name} is receiving {pendingMessages.Count()}.");

            if (!pendingMessages.Any())
            {
                return Task.FromResult(new Message[0]);
            }

            var messages = pendingMessages.ToList();
            messages.ForEach(x => x.IsDelivered = true);
            return Task.FromResult(messages.ToArray());
        }
    }
}