using AutomobilePlantContracts.BindingModels;
using AutomobilePlantContracts.ViewModels;
using AutomobilePlantDataModels.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations.Schema;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Reflection.Metadata;
using System.Text;
using System.Threading.Tasks;

namespace AutomobilePlantDatabaseImplement.Models
{
    public class Car : ICarModel
    {
        public int Id { get; private set; }
        [Required]
        public string CarName { get; private set; } = string.Empty;
        [Required]
        public double Price { get; private set; }

        private Dictionary<int, (IComponentModel, int)>? _carComponents = null;

        [NotMapped]
        public Dictionary<int, (IComponentModel, int)> CarComponents
        {
            get
            {
                if (_carComponents == null)
                {
                    _carComponents = Components.ToDictionary(recPC => recPC.ComponentId, recPC => (recPC.Component as IComponentModel, recPC.Count));
                }
                return _carComponents;
            }
        }

        [ForeignKey("CarId")]
        public virtual List<CarComponent> Components { get; set; } = new();
        [ForeignKey("CarId")]
        public virtual List<Order> Orders { get; set; } = new();

        public static Car? Create(AutomobilePlantDatabase context, CarBindingModel model)
        {
            var components = context.Components;
            return new Car()
            {
                Id = model.Id,
                CarName = model.CarName,
                Price = model.Price,
                Components = model.CarComponents.Select(x => new CarComponent
                {
                    Component = context.Components.First(y => y.Id == x.Key),
                    Count = x.Value.Item2
                }).ToList()
            };
        }

        public void Update(CarBindingModel model)
        {
            CarName = model.CarName;
            Price = model.Price;
        }
        public CarViewModel GetViewModel => new()
        {
            Id = Id,
            CarName = CarName,
            Price = Price,
            CarComponents = CarComponents
        };

        public void UpdateComponents(AutomobilePlantDatabase context, CarBindingModel model)
        {
            var carComponents = context.CarComponents.Where(rec => rec.CarId == model.Id).ToList();
            if (carComponents != null && carComponents.Count > 0)
            {   // удалили те, которых нет в модели
                context.CarComponents.RemoveRange(carComponents.Where(rec => !model.CarComponents.ContainsKey(rec.ComponentId)));
                context.SaveChanges();
                // обновили количество у существующих записей
                foreach (var updateComponent in carComponents)
                {
                    updateComponent.Count = model.CarComponents[updateComponent.ComponentId].Item2;
                    model.CarComponents.Remove(updateComponent.ComponentId);
                }
                context.SaveChanges();
            }
            var car = context.Cars.First(x => x.Id == Id);
            foreach (var pc in model.CarComponents)
            {
                context.CarComponents.Add(new CarComponent
                {
                    Car = car,
                    Component = context.Components.First(x => x.Id == pc.Key),
                    Count = pc.Value.Item2
                });
                context.SaveChanges();
            }
            _carComponents = null;
        }
    }
}