using CanteenContracts.BindingModels;
using CanteenContracts.View;
using CanteenDataModels.Enums;
using CanteenDataModels.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 CanteenDatabaseImplement.Models
{
    public class Order : IOrderModel
    {
        public int Id { get; private set; }
        [Required]
        public int VisitorId { get; private set; }
        [Required]
        public string Description { get; private set; } = string.Empty;
        public double? Sum { get; private set; }

        private Dictionary<int, ICookModel>? _orderCooks = null;

        [NotMapped]
        public Dictionary<int, ICookModel> OrderCooks
        {
            get
            {
                if (_orderCooks == null)
                {
                    _orderCooks = Cooks
                            .ToDictionary(recOD => recOD.CookId, recOD => recOD.Cook as ICookModel);
                }
                return _orderCooks;
            }
        }

        private Dictionary<int, (ITablewareModel, int)>? _orderTablewares = null;

        [NotMapped]
        public Dictionary<int, (ITablewareModel, int)> OrderTablewares
        {
            get
            {
                if (_orderTablewares == null)
                {
                    _orderTablewares = Tablewares
                            .ToDictionary(recOD => recOD.TablewareId, recOD => (recOD.Tableware as ITablewareModel, recOD.CountTablewares));
                }
                return _orderTablewares;
            }
        }

        [ForeignKey("OrderId")]
        public virtual List<LunchOrder> Lunches { get; set; } = new();
        [ForeignKey("OrderId")]
        public virtual List<OrderCook> Cooks { get; set; } = new();
        [ForeignKey("OrderId")]
        public virtual List<OrderTableware> Tablewares { get; set; } = new();
        public virtual Visitor Visitor { get; set; }

        public static Order Create(OrderBindingModel model)
        {
            if (model == null)
            {
                return null;
            }
            return new Order()
            {
                Id = model.Id,
                VisitorId = model.VisitorId,
                Description = model.Description,
                Sum = model.Sum
            };
        }

        public void Update(OrderBindingModel model)
        {
            if (model == null)
            {
                return;
            }
            Description = model.Description;
            Sum = model.Sum;
        }

        public OrderViewModel GetViewModel => new()
        {
            Id = Id,
            VisitorId = VisitorId,
            Description = Description,
            Sum = Sum,
            OrderCooks = OrderCooks,
            OrderTablewares = OrderTablewares
        };
        public void UpdateOrderCook(CanteenDatabase context, OrderBindingModel model)
        {
            var orderCook = context.OrderCook.Where(rec => rec.CookId == model.Id).ToList();
            if (orderCook != null && (orderCook.Count > 0))
            {
                context.OrderCook.RemoveRange(orderCook.Where(rec => !model.OrderCooks.ContainsKey(rec.CookId)));
                context.SaveChanges();
                foreach (var updateCook in orderCook)
                {
                    model.OrderCooks.Remove(updateCook.CookId);
                }
                context.SaveChanges();
            }
            var order = context.Orders.First(x => x.Id == Id);
            foreach (var dp in model.OrderCooks) 
            { 
            
                context.OrderCook.Add(new OrderCook
                {
                    Order = order,
                    Cook = context.Cooks.First(x => x.Id == dp.Key)
                });
                context.SaveChanges();
            }
            _orderCooks = null;
        }
        public void UpdateOrderTablewares(CanteenDatabase context, OrderBindingModel model)
        {
            var orderTableware = context.OrderTableware.Where(rec => rec.TablewareId == model.Id).ToList();
            if (orderTableware != null && (orderTableware.Count > 0))
            {
                context.OrderTableware.RemoveRange(orderTableware.Where(rec => !model.OrderTablewares.ContainsKey(rec.TablewareId)));
                context.SaveChanges();
                foreach (var updateTableware in orderTableware)
                {
                    updateTableware.CountTablewares = model.OrderTablewares[updateTableware.TablewareId].Item2;
                    model.OrderTablewares.Remove(updateTableware.TablewareId);
                }
                context.SaveChanges();
            }
            var order = context.Orders.First(x => x.Id == Id);
            foreach (var dp in model.OrderTablewares)
            {

                context.OrderTableware.Add(new OrderTableware
                {
                    Order = order,
                    Tableware = context.Tablewares.First(x => x.Id == dp.Key),
                    CountTablewares = dp.Value.Item2
                });
                context.SaveChanges();
            }
            _orderTablewares = null;
        }
    }
}