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 STODataModels;
using STOContracts.BindingModels;
using STOContracts.ViewModels;
using STODatabaseImplement;

namespace DatabaseImplement
{
    public class Work: IWorkModel
    {
        public int Id { get; private set; }

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

        public int Time_duration { get; private set; } = 0;
        public Dictionary<int, (ICarPartModel, int)> _CarParts = null;

        [NotMapped]
        public Dictionary<int, (ICarPartModel, int)> CarParts
        {
            get
            {
                if (_CarParts == null)
                {
                    _CarParts = CarPartCar
                    .ToDictionary(recPC => recPC.Id, recPC =>
                   (recPC.CarPart as ICarPartModel, recPC.Count));
                }
                return _CarParts;
            }
        }
        [ForeignKey("WorkId")]
        public virtual List<CarPartWork> CarPartCar { get; set; } = new();


        public static Work? Create(STODatabase context, WorkBindingModel model)
        {
            if (model == null)
            {
                return null;
            }
            return new Work()
            {
                Id = model.Id,
                Name = model.Name,
                Time_duration = model.Time_duration,
                CarPartCar = model.CarParts.Select(x => new
                 CarPartWork
                {
                    CarPart = context.CarParts.First(y => y.Id == x.Key),
                    Count = x.Value.Item2
                }).ToList()
            };
        }
        public void Update(WorkBindingModel model)
        {
            if (model == null)
            {
                return;
            }
            Id = model.Id;
            Name = model.Name;
            Time_duration = model.Time_duration;
        }
        public WorkViewModel GetViewModel => new()
        {
            Id = Id,
            Name = Name,
            Time_duration = Time_duration
        };

        public void UpdateCarParts(STODatabase context, WorkBindingModel model)
        {
            var parts = context.CarPartWork.Where(rec =>
            rec.WorkId == model.Id).ToList();
            if (parts != null && CarParts.Count > 0)
            {
                context.CarPartWork.RemoveRange(parts.Where(rec
                => !model.CarParts.ContainsKey(rec.CarPartId)));
                context.SaveChanges();
                foreach (var updateComponent in parts)
                {
                    updateComponent.Count =
                    model.CarParts[updateComponent.CarPartId].Item2;
                    model.CarParts.Remove(updateComponent.CarPartId);
                }
                context.SaveChanges();
            }
            var manufacture = context.Works.First(x => x.Id == Id);
            foreach (var pc in model.CarParts)
            {
                context.CarPartWork.Add(new CarPartWork
                {
                    Work = manufacture,
                    CarPart = context.CarParts.First(x => x.Id == pc.Key),
                    Count = pc.Value.Item2
                });
                context.SaveChanges();
            }
            _CarParts = null;
        }
    }
}