using CarCenterContracts.BindingModels;
using CarCenterContracts.ViewModels;
using CarCenterDataModels.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CarCenterDataBaseImplement.Models
{
    public class Inspection : IInspectionModel
    {
        public DateTime? InspectionDate { get; set; }
        public int AdministratorId { get; private set; }
        public int? EmployeeId { get; private set; }
        public int Id { get; private set; }
        public string InspectionName { get; set; } = string.Empty;
        public virtual Administrator Administrator { get; set; }
        public virtual Employee? Employee { get; set; }

        [ForeignKey("InspectionId")]
        public virtual List<InspectionCar> Cars { get; set; }

        private Dictionary<int, ICarModel> _inspectionCars = null;

        [NotMapped]
        public Dictionary<int, ICarModel> InspectionCars
        {
            get
            {
                if (_inspectionCars == null)
                {
                    using var context = new CarCenterDataBase();
                    _inspectionCars = Cars
                        .ToDictionary(x => x.CarId, x => (context.Cars
                        .FirstOrDefault(y => y.Id == x.CarId)! as ICarModel));
                }
                return _inspectionCars;
            }
        }
        public static InspectionCars Create(CarCenterDataBase context, InspectionBindingModel model)
        {
            return new Inspection()
            {
                Id = model.Id,
                EmployeeId = model.EmployeeId,
                AdministratorId = model.AdministratorId,
                InspectionName = model.InspectionName,
                Cars = model.InspectionCars.Select(x => new InspectionCar
                {
                    Car = context.Cars.First(y => y.Id == x.Key),
                }).ToList()
            };
        }

        public void Update(InspectionBindingModel model)
        {
            EmployeeId = model.EmployeeId;
            InspectionName = model.InspectionName;
            InspectionDate = model.InspectionDate;
        }

        public InspectionViewModel GetViewModel => new()
        {
            Id = Id,
            EmployeeId = EmployeeId,
            AdministratorId = AdministratorId,
            InspectionName = InspectionName,
            InspectionDate = InspectionDate,
            InspectionCars = InspectionCars,
            EmplFIO = Employee?.EmployeeFIO
        };

        public void UpdateCars(CarCenterDataBase context, InspectionBindingModel model)
        {
            var inspectionCars = context.InspectionCars.Where(rec => rec.InspectionId == model.Id).ToList();

            if (inspectionCars != null && inspectionCars.Any())
            {
                context.InspectionCars.RemoveRange(inspectionCars.Where(rec => !model.InspectionCars.ContainsKey(rec.CarId)));
                context.SaveChanges();

                foreach (var updateCar in inspectionCars)
                {
                    model.InspectionCars.Remove(updateCar.CarId);
                }
                context.SaveChanges();
            }

            var inspection = context.Inspections.First(x => x.Id == Id);

            foreach (var ic in model.InspectionCars)
            {
                context.InspectionCars.Add(new InspectionCar
                {
                    Inspection = inspection,
                    Car = context.Cars.First(x => x.Id == ic.Key)
                });
                context.SaveChanges();
            }
            _inspectionCars = null;
        }
    }
}