using CanteenDataModels.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations.Schema;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using CanteenContracts.BindingModels;
using CanteenContracts.View;

namespace CanteenDatabaseImplement.Models
{
    public class Lunch : ILunchModel
    {
        public int Id { get; private set; }
        public int VisitorId { get; private set; }
        public string LunchName { get; private set; } = string.Empty;
        public double Cost { get; private set; }
        private Dictionary<int, (IProductModel, int)>? _lunchProducts = null;
        public Dictionary<int, (IProductModel, int)> LunchProducts
        {
            get
            {
                if (_lunchProducts == null)
                {
                    _lunchProducts = Products
                    .ToDictionary(recPC => recPC.ProductId, recPC => (recPC.Product as IProductModel, recPC.CountProduct));
                }
                return _lunchProducts;
            }
        }
        [ForeignKey("LunchId")]
        public virtual List<OrderLunch> Orders { get; set; } = new();
        public virtual List<LunchProduct> Products { get; set; } = new();
        public static Lunch? Create(CanteenDatabase context, LunchBindingModel model)
        {
            return new Lunch()
            {
                Id = model.Id,
                VisitorId = model.VisitorId,
                LunchName = model.LunchName,
                Cost = model.Cost,
                Products = model.LunchProducts.Select(x => new LunchProduct
                {
                    Product = context.Products.First(y => y.Id == x.Key)
                }).ToList()
            };
        }

        public void Update(LunchBindingModel model)
        {
            LunchName = model.LunchName;
            Cost = model.Cost;
        }

        public LunchViewModel GetViewModel => new()
        {
            Id = Id,
            VisitorId = VisitorId,
            LunchName = LunchName,
            Cost = Cost,
            LunchProducts = LunchProducts
        };

        public void UpdateProduct(CanteenDatabase context, LunchBindingModel model)
        {
            var lunchProducts = context.LunchProducts.Where(record => record.ProductId == model.Id).ToList();
            if (lunchProducts != null && lunchProducts.Count > 0)
            {
                context.LunchProducts.RemoveRange(lunchProducts.Where(record => !model.LunchProducts.ContainsKey(record.ProductId)));
                context.SaveChanges();
            }

            var product = context.Products.First(x => x.Id == Id);
            foreach (var pc in model.LunchProducts)
            {
                context.LunchProducts.Add(new LunchProduct
                {
                    Product = product,
                    Lunch = context.Lunches.First(x => x.Id == pc.Key),
                });
                context.SaveChanges();
            }

            _lunchProducts = null;
        }
    }
}