using LawFirmContracts.BindingModels;
using LawFirmContracts.ViewModels;
using LawFirmDataModels.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 LawFirmDatabaseImplement.Models
{
    public class Law : ILawModel
    {
        public int Id { get; set; }
        [Required]
        public string LawName { get; set; } = string.Empty;
        [Required]
        public double Price { get; set; }
        private Dictionary<int, (IComponentModel, int)>? _LawComponents =
       null;
        [NotMapped]
        public Dictionary<int, (IComponentModel, int)> LawComponents
        {
            get
            {
                if (_LawComponents == null)
                {
                    _LawComponents = Components
                    .ToDictionary(recPC => recPC.ComponentId, recPC =>
                   (recPC.Component as IComponentModel, recPC.Count));
                }
                return _LawComponents;
            }
        }
        [ForeignKey("LawId")]
        public virtual List<LawComponent> Components { get; set; } = new();
        [ForeignKey("LawId")]
        public virtual List<Order> Orders { get; set; } = new();
        public static Law Create(LawFirmDataBase context,
       LawBindingModel model)
        {
            return new Law()
            {
                Id = model.Id,
                LawName = model.LawName,
                Price = model.Price,
                Components = model.LawComponents.Select(x => new
               LawComponent
                {
                    Component = context.Components.First(y => y.Id == x.Key),
                    Count = x.Value.Item2
                }).ToList()
            };
        }
        public void Update(LawBindingModel model)
        {
            LawName = model.LawName;
            Price = model.Price;
        }
        public LawViewModel GetViewModel => new()
        {
            Id = Id,
            LawName = LawName,
            Price = Price,
            LawComponents = LawComponents
        };
        public void UpdateComponents(LawFirmDataBase context,
       LawBindingModel model)
        {
            var LawComponents = context.LawComponents.Where(rec =>
           rec.LawId == model.Id).ToList();
            if (LawComponents != null && LawComponents.Count > 0)
            {
                context.LawComponents.RemoveRange(LawComponents.Where(rec
=> !model.LawComponents.ContainsKey(rec.ComponentId)));

                context.SaveChanges();
                foreach (var updateComponent in LawComponents)
                {
                    updateComponent.Count =
                   model.LawComponents[updateComponent.ComponentId].Item2;
                    model.LawComponents.Remove(updateComponent.ComponentId);
                }
                context.SaveChanges();
            }
            var Law = context.Laws.First(x => x.Id == Id);
            foreach (var pc in model.LawComponents)
            {
                context.LawComponents.Add(new LawComponent
                {
                    Law = Law,
                    Component = context.Components.First(x => x.Id == pc.Key),
                    Count = pc.Value.Item2
                });
                context.SaveChanges();
            }
            _LawComponents = null;
        }
    }
}