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

namespace FurnitureAssemblyDatabaseImplement.Models
{
    public class Furniture : IFurnitureModel
    {
        public int Id { get; set; }
        [Required]
        public string FurnitureName { get; set; } = string.Empty;
        [Required]
        public double Price { get; set; }
        private Dictionary<int, (IComponentModel, int)>? _furnitureComponents = null;
        [NotMapped]
        public Dictionary<int, (IComponentModel, int)> FurnitureComponents
        {
            get
            {
                if (_furnitureComponents == null)
                {
                    _furnitureComponents = Components
                    .ToDictionary(recPC => recPC.ComponentId, recPC =>
                   (recPC.Component as IComponentModel, recPC.Count));
                }
                return _furnitureComponents;
            }
        }
        [ForeignKey("FurnitureId")]
        public virtual List<FurnitureComponent> Components { get; set; } = new();
        [ForeignKey("FurnitureId")]
        public virtual List<Order> Orders { get; set; } = new();
        public static Furniture Create(FurnitureAssemblyDatabase context, FurnitureBindingModel model)
        {
            return new Furniture()
            {
                Id = model.Id,
                FurnitureName = model.FurnitureName,
                Price = model.Price,
                Components = model.FurnitureComponents.Select(x => new FurnitureComponent
                {
                    Component = context.Components.First(y => y.Id == x.Key),
                    Count = x.Value.Item2
                }).ToList()
            };
        }
        public void Update(FurnitureBindingModel model)
        {
            FurnitureName = model.FurnitureName;
            Price = model.Price;
        }
        public FurnitureViewModel GetViewModel => new()
        {
            Id = Id,
            FurnitureName = FurnitureName,
            Price = Price,
            FurnitureComponents = FurnitureComponents
        };

        public void UpdateComponents(FurnitureAssemblyDatabase context, FurnitureBindingModel model)
        {
            var furnitureComponents = context.FurnitureComponents.Where(rec => rec.FurnitureId == model.Id).ToList();
            if (furnitureComponents != null && furnitureComponents.Count > 0)
            { // удалили те, которых нет в модели
                context.FurnitureComponents.RemoveRange(furnitureComponents.Where(rec
               => !model.FurnitureComponents.ContainsKey(rec.ComponentId)));
                context.SaveChanges();
                // обновили количество у существующих записей
                foreach (var updateComponent in furnitureComponents)
                {
                    updateComponent.Count = model.FurnitureComponents[updateComponent.ComponentId].Item2;
                    model.FurnitureComponents.Remove(updateComponent.ComponentId);
                }
                context.SaveChanges();
            }
            var furniture = context.Furnitures.First(x => x.Id == Id);
            foreach (var pc in model.FurnitureComponents)
            {
                context.FurnitureComponents.Add(new FurnitureComponent
                {
                    Furniture = furniture,
                    Component = context.Components.First(x => x.Id == pc.Key),
                    Count = pc.Value.Item2
                });
                context.SaveChanges();
            }
            _furnitureComponents = null;
        }

    }
}