using LawFimDataModels.Models;
using LawFirmContracts.BindingModels;
using LawFirmContracts.ViewModels;
using System.ComponentModel.DataAnnotations.Schema;
using System.ComponentModel.DataAnnotations;

namespace LawFirmDatabaseImplement.Models
{
    public class Visit : IVisitModel
    {
        public int Id { get; private set; }
        [Required]
        public DateTime VisitDate { get; private set; }

        //связь один-к-одному
        public int HearingId { get; private set; }
        public Hearing Hearing { get; set; } = null!;
        //---
        public int ExecutorId { get; set; }

        private Dictionary<int, IClientModel>? _visitClients = null;
        [NotMapped]
        public Dictionary<int, IClientModel> VisitClients
        {
            get
            {

                if (_visitClients == null)
                {
                    using var context = new LawFirmDatabase();
                    _visitClients = Clients
                     .ToDictionary(x => x.ClientId, x => (context.Clients
                         .FirstOrDefault(y => y.Id == x.ClientId) as IClientModel));
                }
                return _visitClients;
            }
        }
        [ForeignKey("VisitId")]
        public virtual List<VisitClient> Clients { get; set; } = new();
        public static Visit? Create(LawFirmDatabase context, VisitBindingModel? model)
        {
            if (model == null)
            {
                return null;
            }
            var visits = context.Visits.Where(x => x.HearingId == model.HearingId).ToList();
            if (visits.Count > 0)
            {
                return null;
            }
            return new Visit()
            {
                Id = model.Id,
                VisitDate = model.VisitDate,
                HearingId = model.HearingId,
                ExecutorId = model.ExecutorId,
                Hearing = context.Hearings.First(x => x.Id == model.HearingId),
                Clients = model.VisitClients.Select(x => new VisitClient
                {
                    Client = context.Clients.First(y => y.Id == x.Key)
                }).ToList()
            };
        }
        public void Update(VisitBindingModel? model)
        {
            using var context = new LawFirmDatabase();

            if (model == null)
            {
                return;
            }

            VisitDate = model.VisitDate;
            HearingId = model.HearingId;
        }
        public VisitViewModel GetViewModel => new()
        {
            Id = Id,
            VisitDate = VisitDate,
            HearingId = HearingId,
            VisitClients = VisitClients,
            ExecutorId = ExecutorId,
        };
        public void UpdateClients(LawFirmDatabase context,
       VisitBindingModel model)
        {
            var visitClients = context.VisitClients.Where(rec =>
           rec.VisitId == model.Id).ToList();
            if (visitClients != null && visitClients.Count > 0)
            { // удалили те, которых нет в модели
                context.VisitClients.RemoveRange(visitClients.Where(rec
               => !model.VisitClients.ContainsKey(rec.ClientId)));
                context.SaveChanges();
            }
            var _visit = context.Visits.First(x => x.Id == Id);
            foreach (var pc in model.VisitClients)
            {
                if (!VisitClients.ContainsKey(pc.Key))
                {
                    context.VisitClients.Add(new VisitClient
                    {
                        Visit = _visit,
                        Client = context.Clients.First(x => x.Id == pc.Key),
                    });
                }
                context.SaveChanges();
            }
            _visitClients = null;
        }
    }
}