using CarRepairShopContracts.BindingModels;
using CarRepairShopContracts.ViewModels;
using CarRepairShopDataModels.Models;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace CarRepairShopDatabaseImplement.Models
{
    public class Repair : IRepairModel
    {
        public int Id { get; set; }

        [Required]
        public string RepairName { get; set; } = string.Empty;

        [Required]
        public double Price { get; set; }

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

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

        [ForeignKey("RepairId")]
        public virtual List<RepairComponent> Components { get; set; } = new();

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

        public static Repair Create(CarRepairShopDatabase context, RepairBindingModel model)
        {
            return new Repair()
            {
                Id = model.Id,
                RepairName = model.RepairName,
                Price = model.Price,
                Components = model.RepairComponents.Select(x => new RepairComponent
                {
                    Component = context.Components.First(y => y.Id == x.Key),
                    Count = x.Value.Item2
                }).ToList()
            };
        }

        public void Update(RepairBindingModel model)
        {
            RepairName = model.RepairName;
            Price = model.Price;
        }

        public RepairViewModel GetViewModel => new()
        {
            Id = Id,
            RepairName = RepairName,
            Price = Price,
            RepairComponents = RepairComponents
        };

        public void UpdateComponents(CarRepairShopDatabase context, RepairBindingModel model)
        {
            var repairComponents = context.RepairComponents.Where(rec => rec.RepairId == model.Id).ToList();
            if (repairComponents != null && repairComponents.Count > 0)
            {   // удалили те, которых нет в модели
                context.RepairComponents.RemoveRange(repairComponents.Where(rec => !model.RepairComponents.ContainsKey(rec.ComponentId)));
                context.SaveChanges();
                // обновили количество у существующих записей
                foreach (var updateComponent in repairComponents)
                {
                    updateComponent.Count = model.RepairComponents[updateComponent.ComponentId].Item2;
                    model.RepairComponents.Remove(updateComponent.ComponentId);
                }
                context.SaveChanges();
            }
            var repair = context.Repairs.First(x => x.Id == Id);
            foreach (var pc in model.RepairComponents)
            {
                context.RepairComponents.Add(new RepairComponent
                {
                    Repair = repair,
                    Component = context.Components.First(x => x.Id == pc.Key),
                    Count = pc.Value.Item2
                });
                context.SaveChanges();
            }
            _repairComponents = null;
        }
    }
}