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 Document : IDocumentModel
    {
        public int Id { get; private set; }
        [Required]
        public string DocumentName { get; private set; } = string.Empty;
        [Required]
        public double Price { get; private set; }

        private Dictionary<int, (IBlankModel, int)>? _documentBlanks = null;

        [NotMapped]
        public Dictionary<int, (IBlankModel, int)> DocumentBlanks
        {
            get
            {
                if (_documentBlanks == null)
                {
                    _documentBlanks = Blanks.ToDictionary(recPC => recPC.BlankId, recPC => (recPC.Blank as IBlankModel, recPC.Count));
                }
                return _documentBlanks;
            }
        }

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


        public static Document? Create(LawFirmDatabase context, DocumentBindingModel model)
        {
            var blanks = context.Blanks;

            return new Document()
            {
                Id = model.Id,
                DocumentName = model.DocumentName,
                Price = model.Price,
                Blanks = model.DocumentBlanks.Select(x => new DocumentBlank
                {
                    Blank = context.Blanks.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,
            DocumentBlanks = DocumentBlanks
        };

        public void UpdateComponents(LawFirmDatabase context, DocumentBindingModel model)
        {
            var documentBlanks = context.DocumentBlanks.Where(rec => rec.DocumentId == model.Id).ToList();
            if (documentBlanks != null && documentBlanks.Count > 0)
            {   // удалили те, которых нет в модели
                context.DocumentBlanks.RemoveRange(documentBlanks.Where(rec => !model.DocumentBlanks.ContainsKey(rec.BlankId)));
                context.SaveChanges();
                // обновили количество у существующих записей
                foreach (var updateBlank in documentBlanks)
                {
                    updateBlank.Count = model.DocumentBlanks[updateBlank.BlankId].Item2;
                    model.DocumentBlanks.Remove(updateBlank.BlankId);
                }
                context.SaveChanges();
            }
            var document = context.Documents.First(x => x.Id == Id);
            foreach (var pc in model.DocumentBlanks)
            {
                context.DocumentBlanks.Add(new DocumentBlank
                {
                    Document = document,
                    Blank = context.Blanks.First(x => x.Id == pc.Key),
                    Count = pc.Value.Item2
                });
                context.SaveChanges();
            }
            _documentBlanks = null;
        }
    }
}