PIbd-23-Nasyrov-A.G.-FlowerShop/FlowerShopFileImplement/OrderStorage.cs

using FlowerShopContracts.BindingModels;
using FlowerShopContracts.SearchModels;
using FlowerShopContracts.StoragesContracts;
using FlowerShopContracts.ViewModels;
using FlowerShopFileImplement.Models;
using FlowerShopFileImplement.Implements;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FlowerShopFileImplement.Implements
{
    public class OrderStorage : IOrderStorage
    {
        private readonly DataFileSingleton source;
        public OrderStorage()
        {
            source = DataFileSingleton.GetInstance();
        }

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

        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return new();
            }
            return source.Orders.Where(x => (
										 (!model.Id.HasValue || x.Id == model.Id) &&
										 (!model.DateFrom.HasValue || x.DateCreate >= model.DateFrom) &&
										 (!model.DateTo.HasValue || x.DateCreate <= model.DateTo)
										 &&
										 (!model.ClientId.HasValue || x.ClientId == model.ClientId)
										 &&
										 (!model.Status.HasValue || x.Status == model.Status)
									 )
				)
		    .Select(x => AccessStorage(x.GetViewModel))
			.ToList();
        }

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

        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 AccessStorage(newOrder.GetViewModel);
        }

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

        public OrderViewModel AccessStorage(OrderViewModel model)
        {
            if (model == null)
                return null;
			var flower = source.Flowers.FirstOrDefault(x => x.Id == model.Id);
			var client = source.Clients.FirstOrDefault(x => x.Id == model.Id);
			var implementer = source.Implementers.FirstOrDefault(x => x.Id == model.ImplementerId);
			if (flower != null)
				model.FlowerName = flower.FlowerName;
			if (client != null)
				model.ClientFIO = client.ClientFIO;
			if (implementer != null)
				model.ImplementerFIO = implementer.ImplementerFIO;
			return model;
		} 
    }
}