using LawFirmContracts.BindingModels;
using LawFirmContracts.ViewModels;
using LawFirmDataModels.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;

namespace LawFirmFileImplement.Models
{
    public class Document : IDocumentModel
    {
        public string DocumentName { get; private set; } = string.Empty;

        public double Price { get; private set; }

        public int Id { get; private set; }

        public Dictionary<int, int> Blanks { get; private set; } = new();

        private Dictionary<int, (IBlankModel, int)>? _documentBlanks = null;
        public Dictionary<int, (IBlankModel, int)> DocumentBlanks
        {
            get
            {
                if (_documentBlanks == null)
                {
                    var source = DataFileSingleton.GetInstance();
                    _documentBlanks = Blanks.ToDictionary(
                        x => x.Key, 
                        y => ((source.Blanks.FirstOrDefault(z => z.Id == y.Key) as IBlankModel)!, y.Value)
                    );
                }
                return _documentBlanks;
            }
        }


        public static Document? Create(DocumentBindingModel? model)
        {
            if (model == null)
            {
                return null;
            }
            return new Document()
            {
                Id = model.Id,
                DocumentName = model.DocumentName,
                Price = model.Price,
                Blanks = model.DocumentBlanks.ToDictionary(x => x.Key, x => x.Value.Item2)
            };
        }

        public static Document? Create(XElement element)
        {
            if (element == null)
            {
                return null;
            }
            return new Document()
            {
                Id = Convert.ToInt32(element.Attribute("Id")!.Value),
                DocumentName = element.Element("DocumentName")!.Value,
                Price = Convert.ToDouble(element.Element("Price")!.Value),
                Blanks = element.Element("DocumentBlanks")!.Elements("DocumentBlank").ToDictionary(
                    x => Convert.ToInt32(x.Element("Key")?.Value), 
                    x => Convert.ToInt32(x.Element("Value")?.Value)
                )
            };
        }


        public void Update(DocumentBindingModel? model)
        {
            if (model == null)
            {
                return;
            }
            DocumentName = model.DocumentName;
            Price = model.Price;
            Blanks = model.DocumentBlanks.ToDictionary(x => x.Key, x => x.Value.Item2);
            _documentBlanks = null;
        }
        public DocumentViewModel GetViewModel => new()
        {
            Id = Id,
            DocumentName = DocumentName,
            Price = Price,
            DocumentBlanks = DocumentBlanks
        };

        public XElement GetXElement => new(
            "Document",
             new XAttribute("Id", Id),
             new XElement("DocumentName", DocumentName),
             new XElement("Price", Price.ToString()),
             new XElement("DocumentBlanks", Blanks.Select(x =>
             new XElement("DocumentBlank",
             new XElement("Key", x.Key),
             new XElement("Value", x.Value)))
            .ToArray()));
    }
}