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

namespace LawFirmDatabaseImplement.Models
{
    public class Case : ICaseModel
    {
        public int Id { get; private set; }
        [Required]
        public string Name { get; private set; } = String.Empty;
        [Required]
        public string CaseType { get; private set; } = String.Empty;
        [Required]
        public DateTime DateCreate { get; private set; }
        public DateTime? DateImplement { get; private set; }
        [Required]
        public CaseStatus Status { get; private set; }
        private Dictionary<int, IClientModel>? _caseClients = null;
        public int ExecutorId { get; set; }

        [NotMapped]
        public Dictionary<int, IClientModel> CaseClients
        {
            get
            {
                if (_caseClients == null)
                {
                    using var context = new LawFirmDatabase();
                    _caseClients = Clients
                    .ToDictionary(x => x.ClientId, x => (context.Clients.FirstOrDefault(y => y.Id == x.ClientId) as IClientModel));
                }

                return _caseClients;
            }
        }
        [ForeignKey("CaseId")]
        public virtual List<CaseClient> Clients { get; set; } = new();
        public static Case Create(LawFirmDatabase context, CaseBindingModel model)
        {
            if (model == null)
            {
                return null;
            }
            return new Case()
            {
                Id = model.Id,
                Name = model.Name,
                DateCreate = model.DateCreate,
                DateImplement = model.DateImplement,
                Status = model.Status,
                ExecutorId = model.ExecutorId,
                Clients = model.CaseClients.Select(x => new CaseClient
                {
                    Client = context.Clients.First(y => y.Id == x.Key)
                }).ToList()
            };
        }
        public void Update(CaseBindingModel? model)
        {
            using var context = new LawFirmDatabase();
            if (model == null)
            {
                return;
            }
            if (model.Status == CaseStatus.ЗакрытиеДела) DateImplement = DateTime.Now;
            Name = model.Name;
            Status = model.Status;


            if (model.DateImplement.HasValue) DateImplement = model.DateImplement;
        }
        public CaseViewModel GetViewModel => new()
        {
            Id = Id,
            Name = Name,
            CaseType = CaseType,
            DateCreate = DateCreate,
            DateImplement = DateImplement,
            ExecutorId = ExecutorId,
            Status = Status,
            CaseClients = CaseClients,
        };


        public void UpdateClients(LawFirmDatabase context, CaseBindingModel model)
        {
            var caseClients = context.CaseClients.Where(rec =>
           rec.CaseId == model.Id).ToList();
            if (caseClients != null && caseClients.Count > 0)
            { // удалили те, которых нет в модели
                context.CaseClients.RemoveRange(caseClients.Where(rec
               => !model.CaseClients.ContainsKey(rec.ClientId)));
                context.SaveChanges();
            }
            var _case = context.Cases.First(x => x.Id == Id);
            foreach (var pc in model.CaseClients)
            {
                if (!CaseClients.ContainsKey(pc.Key))
                {
                    context.CaseClients.Add(new CaseClient
                    {
                        Case = _case,
                        Client = context.Clients.First(x => x.Id == pc.Key),
                    });
                }
                context.SaveChanges();
            }
            _caseClients = null;
        }
    }
}