using Xgen.Common.Extensions;
using Xgen.Domain.Common;
using Xgen.Domain.Common.Events;
using Xgen.Domain.Model.Forms;
using Xgen.Domain.Model.Forms.Events;
using Xgen.Domain.Model.LMS;
using Xgen.Domain.Model.LMS.Contents;

namespace Xgen.Domain.Events.Forms
{
    public class FormCreatedHandler :
        IEventHandler<FormCreatedEvent>,
        IEventHandler<FormChangeTitleEvent>,
        IEventHandler<FormStatusChangedEvent>,
        IEventHandler<FormChangeDescriptionEvent>,
        IEventHandler<FormChangePublicationDateEvent>
    {
        private readonly IUnitOfWork _unitOfWork;
        private readonly IFormRepository _formRepository;
        private readonly IContentRepository _contentRepository;
        private readonly IContentTagRepository _contentTagRepository;

        public FormCreatedHandler(IUnitOfWork unitOfWork, IFormRepository formRepository,
            IContentRepository contentRepository, IContentTagRepository contentTagRepository)
        {
            _unitOfWork = unitOfWork;
            _formRepository = formRepository;
            _contentRepository = contentRepository;
            _contentTagRepository = contentTagRepository;
        }

        public void Process(FormCreatedEvent @event)
        {
            if (@event.RequireAnonymity)
                return;

            var form = _formRepository.GetAll().NotTracking().ByTrackingId(@event.Id);

            var formContent = new FormContent(
                tenantId: form.TenantId,
                formId: form.Id,
                title: form.Title,
                friendlyId: form.FriendlyId,
                description: form.Description,
                status: form.Status);

            formContent.ChangePublicationDate(form.PublicationDate);
            formContent.CategorizeIt(CategorizeIt(form));

            _contentRepository.Save(formContent);

            _unitOfWork.SaveChanges();
        }

        public void Process(FormChangeTitleEvent @event)
        {
            var form = _formRepository.GetAll().NotTracking().Eager(_ => _.Category).GetById(@event.Id);
            if (form.RequireAnonymity)
                return;

            var formContent = _contentRepository.GetFormContents().Eager(_ => _.Content).ByFormId(@event.Id);

            formContent.ChangeTitle(@event.Title, @event.FriendlyId);
            formContent.CategorizeIt(CategorizeIt(form));

            _unitOfWork.SaveChanges();
        }

        public void Process(FormStatusChangedEvent @event)
        {
            var form = _formRepository.GetAll().NotTracking().Eager(_ => _.Category).GetById(@event.Id);
            if (form.RequireAnonymity)
                return;

            var formContent = _contentRepository.GetFormContents().Eager(_ => _.Content).ByFormId(@event.Id);

            formContent.ChangeStatus(@event.Status, stopPropagation: true);
            formContent.CategorizeIt(CategorizeIt(form));

            _unitOfWork.SaveChanges();
        }

        public void Process(FormChangeDescriptionEvent @event)
        {
            var form = _formRepository.GetAll().NotTracking().Eager(_ => _.Category).GetById(@event.Id);
            if (form.RequireAnonymity)
                return;

            var formContent = _contentRepository.GetFormContents().Eager(_ => _.Content).ByFormId(@event.Id);

            formContent.ChangeDescription(@event.Description);
            formContent.CategorizeIt(CategorizeIt(form));

            _unitOfWork.SaveChanges();
        }

        public void Process(FormChangePublicationDateEvent @event)
        {
            var form = _formRepository.GetAll().NotTracking().Eager(_ => _.Category).GetById(@event.Id);
            if (form.RequireAnonymity)
                return;

            var formContent = _contentRepository.GetFormContents().Eager(_ => _.Content).ByFormId(@event.Id);

            formContent.ChangePublicationDate(@event.Period);
            formContent.CategorizeIt(CategorizeIt(form));

            _unitOfWork.SaveChanges();
        }

        public ContentTag CategorizeIt(Form form)
        {
            var category = default(ContentTag);
            if (form.Category.IsNotNullOrEmpty())
            {
                category = _contentTagRepository.GetAll().ByName(form.Category.Label);
            }

            return category;
        }
    }
}