PIbd-23-Volkov-N.A.-ComputersShop/ComputersShop/ComputersShopFileImplement/Implements/OrderStorage.cs

using ComputersShopContracts.BindingModels;
using ComputersShopContracts.SearchModels;
using ComputersShopContracts.StoragesContracts;
using ComputersShopContracts.ViewModels;
using ComputersShopFileImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ComputersShopFileImplement.Implements
{
    public class OrderStorage : IOrderStorage
    {
        private readonly DataFileSingleton source;

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

        public OrderViewModel? GetElement(OrderSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }
            return GetViewModel(source.Orders.FirstOrDefault(x => model.Id.HasValue && x.Id == model.Id));
        }

        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
        {
            if (!model.Id.HasValue && model.DateFrom.HasValue && model.DateTo.HasValue)
            {
                return source.Orders
                    .Where(x => model.DateFrom <= x.DateCreate.Date && x.DateCreate <= model.DateTo)
                    .Select(x => GetViewModel(x))
                    .ToList();
            }
            if (!model.Id.HasValue && model.ClientId.HasValue)
            {
                return source.Orders
                    .Where(x => x.ClientId == model.ClientId)
                    .Select(x => GetViewModel(x))
                    .ToList();
            }
            var result = GetElement(model);
            return result != null ? new() { result } : new();
        }

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

        public OrderViewModel? Insert(OrderBindingModel model)
        {
            model.Id = source.Orders.Count > 0 ? source.Orders.Max(x => x.Id) + 1 : 1;
            var newOrder = Order.Create(model);
            if (newOrder == null)
            {
                return null;
            }
            source.Orders.Add(newOrder);
            source.SaveOrders();
            return GetViewModel(newOrder);
        }

        public OrderViewModel? Update(OrderBindingModel 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 OrderViewModel? Delete(OrderBindingModel model)
        {
            var order = source.Orders.FirstOrDefault(x => x.Id == model.Id);
            if (order == null)
            {
                return null;
            }
            order.Update(model);
            source.SaveOrders();
            return GetViewModel(order);
        }

        private OrderViewModel GetViewModel(Order order)
        {
            var viewModel = order.GetViewModel;
            foreach (var comp in source.Computers)
            {
                if (comp.Id == order.ComputerId)
                {
                    viewModel.ComputerName = comp.ComputerName;
                    break;
                }
            }
            foreach (var client in source.Clients)
            {
                if (client.Id == order.ClientId)
                {
                    viewModel.ClientFIO = client.ClientFIO;
                    break;
                }
            }
            return viewModel;
        }
    }
}