using AbstractLawFirmDataModels.Models;
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 AbstractLawFirmContracts.BindingModels;
using AbstractLawFirmContracts.ViewModels;

namespace AbstractLawFirmDatabaseImplement.Models
{
    public class Document : IDocumentModel
    {
        public int Id { get; set; }
        [Required]
        public string DocumentName { get; set; } = string.Empty;
        [Required]
        public double Price { get; set; }
        private Dictionary<int, (IComponentModel, int)>? _documentComponents =
       null;
        [NotMapped]
        public Dictionary<int, (IComponentModel, int)> DocumentComponents
        {
            get
            {
                if (_documentComponents == null)
                {
                    _documentComponents = Components
                    .ToDictionary(recPC => recPC.ComponentId, recPC =>
                   (recPC.Component as IComponentModel, recPC.Count));
                }
                return _documentComponents;
            }
        }
        [ForeignKey("DocumentId")]
        public virtual List<DocumentComponent> Components { get; set; } = new();
        [ForeignKey("DocumentId")]
        public virtual List<Order> Orders { get; set; } = new();
        public static Document Create(AbstractLawFirmDatabase context,
       DocumentBindingModel model)
        {
            return new Document()
            {
                Id = model.Id,
                DocumentName = model.DocumentName,
                Price = model.Price,
                Components = model.DocumentComponents.Select(x => new
               DocumentComponent
                {
                    Component = context.Components.First(y => y.Id == x.Key),
                    Count = x.Value.Item2
                }).ToList()
            };
        }
        public void Update(DocumentBindingModel model)
        {
            DocumentName = model.DocumentName;
            Price = model.Price;
        }
        public DocumentViewModel GetViewModel => new()
        {
            Id = Id,
            DocumentName = DocumentName,
            Price = Price,
            DocumentComponents = DocumentComponents
        };
        public void UpdateComponents(AbstractLawFirmDatabase context,
       DocumentBindingModel model)
        {
            var documentComponents = context.DocumentComponents.Where(rec => rec.DocumentId == model.Id).ToList();
            if (documentComponents != null && documentComponents.Count > 0)
            { // удалили те, которых нет в модели
                context.DocumentComponents.RemoveRange(documentComponents.Where(rec
               => !model.DocumentComponents.ContainsKey(rec.ComponentId)));
                context.SaveChanges();
                // обновили количество у существующих записей
                foreach (var updateComponent in documentComponents)
                {
                    updateComponent.Count = model.DocumentComponents[updateComponent.ComponentId].Item2;
                    model.DocumentComponents.Remove(updateComponent.ComponentId);
                }
                context.SaveChanges();
            }
            var document = context.Documents.First(x => x.Id == Id);
            foreach (var pc in model.DocumentComponents)
            {
                context.DocumentComponents.Add(new DocumentComponent
                {
                    Document = document,
                    Component = context.Components.First(x => x.Id == pc.Key),
                    Count = pc.Value.Item2
                });
                context.SaveChanges();
            }
            _documentComponents = null;
        }

    }
}