using FurnitureAssemblyContracts.BindingModels;
using FurnitureAssemblyContracts.SearchModels;
using FurnitureAssemblyContracts.StoragesContracts;
using FurnitureAssemblyContracts.ViewModels;
using FurnitureAssemblyFileImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FurnitureAssemblyFileImplement.Implements
{
    public class AdStorage : IAdStorage
    {
        private readonly DataFileSingleton source;

        public AdStorage()
        {
            source = DataFileSingleton.GetInstance();
        }

        public List<AdViewModel> GetFullList()
        {
            return source.Orders.Select(x => GetViewModel(x)).ToList();
        }

        public List<AdViewModel> GetFilteredList(AdSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return new();
            }

            return source.Orders.Where(x => x.Id == model.Id).Select(x => GetViewModel(x)).ToList();
        }

        public AdViewModel? GetElement(AdSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }

            return source.Orders.FirstOrDefault(x => (model.Id.HasValue && x.Id == model.Id))?.GetViewModel;
        }

        private AdViewModel GetViewModel(Ad order)
        {
            var viewModel = order.GetViewModel;

            var furniture = source.Furnitures.FirstOrDefault(x => x.Id == order.FurnitureId);

            viewModel.UsersName = furniture?.UsersName;

            return viewModel;
        }

        public AdViewModel? Insert(AdBindingModel model)
        {
            model.Id = source.Orders.Count > 0 ? source.Orders.Max(x => x.Id) + 1 : 1;

            var newOrder = Ad.Create(model);

            if (newOrder == null)
            {
                return null;
            }

            source.Orders.Add(newOrder);
            source.SaveOrders();

            return GetViewModel(newOrder);
        }

        public AdViewModel? Update(AdBindingModel model)
        {
            var order = source.Orders.FirstOrDefault(x => x.Id == model.Id);

            if (order == null)
            {
                return null;
            }

            order.Update(model);
            source.SaveOrders();

            return GetViewModel(order);
        }

        public AdViewModel? Delete(AdBindingModel model)
        {
            var element = source.Orders.FirstOrDefault(x => x.Id == model.Id);

            if (element != null)
            {
                source.Orders.Remove(element);
                source.SaveOrders();

                return GetViewModel(element);
            }

            return null;
        }
    }
}