using SushiBarContracts.BindingModels;
using SushiBarContracts.ViewModels;
using SushiBarDataModels.Models;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace SushiBarDatabaseImplement.Models
{
    public class Sushi : ISushiModel
    {
        public int Id { get; set; }
        [Required]
        public string SushiName { get; set; } = string.Empty;
        [Required]
        public double Price { get; set; }
        private Dictionary<int, (IComponentModel, int)>? _sushiComponents = null;
        [NotMapped]
        public Dictionary<int, (IComponentModel, int)> SushiComponents
        {
            get
            {
                if (_sushiComponents == null)
                {
                    _sushiComponents = Components
                        .ToDictionary(recPC => recPC.ComponentId, recPC =>
                        (recPC.Component as IComponentModel, recPC.Count));
                }
                return _sushiComponents;
            }
        }
        [ForeignKey("SushiId")]
        public virtual List<SushiComponent> Components { get; set; } = new();
        [ForeignKey("SushiId")]
        public virtual List<Order> Orders { get; set; } = new();
        public static Sushi Create(SushiBarDatabase context, SushiBindingModel model)
        {
            return new Sushi()
            {
                Id = model.Id,
                SushiName = model.SushiName,
                Price = model.Price,
                Components = model.SushiComponents.Select(x =>
                new SushiComponent
                {
                    Component = context.Components.First(y => y.Id == x.Key),
                    Count = x.Value.Item2
                }).ToList()
            };
        }
        public void Update(SushiBindingModel model)
        {
            SushiName = model.SushiName;
            Price = model.Price;
        }
        public SushiViewModel GetViewModel => new()
        {
            Id = Id,
            SushiName = SushiName,
            Price = Price,
            SushiComponents = SushiComponents
        };
        public void UpdateComponents(SushiBarDatabase context, SushiBindingModel model)
        {
            var sushiComponents = context.SushiComponents.Where(rec =>
            rec.SushiId == model.Id).ToList();
            if (sushiComponents !=  null && sushiComponents.Count > 0)
            { // удалили те, которых нет в модели
                context.SushiComponents.RemoveRange(sushiComponents.Where(rec =>
                !model.SushiComponents.ContainsKey(rec.ComponentId)));
                context.SaveChanges();
                // обновили количество у существующих записей
                foreach (var updateComponent in sushiComponents)
                {
                    updateComponent.Count = model.SushiComponents[updateComponent.ComponentId].Item2;
                    model.SushiComponents.Remove(updateComponent.ComponentId);
                }
                context.SaveChanges();
            }
            var sushi = context.Sushis.First(x => x.Id == Id);
            foreach (var pc in model.SushiComponents)
            {
                context.SushiComponents.Add(new SushiComponent
                {
                    Sushi = sushi,
                    Component = context.Components.First(x => x.Id == pc.Key),
                    Count = pc.Value.Item2
                });
                context.SaveChanges();
            }
            _sushiComponents = null;
        }
    }
}