using ComputerShopContracts.BindingModels;
using ComputerShopContracts.SearchModels;
using ComputerShopContracts.StorageContracts;
using ComputerShopContracts.ViewModels;
using ComputerShopDatabaseImplement.Models;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ComputerShopDatabaseImplement.Implements
{
	public class BatchStorage : IBatchStorage
	{
		public List<BatchViewModel> GetFullList()
		{
			using var context = new ComputerShopDatabase();

			return context.Batchs
			.ToList()
			.Select(x => x.GetViewModel)
			.ToList();
		}

        public List<BatchViewModel> GetFilteredList(BatchSearchModel model)
        {
            using var context = new ComputerShopDatabase();
            //сортировка партий по дате
            if (model.DateFrom.HasValue && model.DateTo.HasValue)
            {
                return context.Batchs
                    .Where(x => (x.DateBatch >= model.DateFrom && x.DateBatch <= model.DateTo))
                    .Select(x => x.GetViewModel)
                    .ToList();
            }

            //партии по товарам
            return context.Batchs
                .Where(x => x.ProductId == model.ProductId)
                .Select(x => x.GetViewModel)
                .ToList();
        }

        public BatchViewModel? GetElement(BatchSearchModel model)
		{
			if (!model.Id.HasValue)
			{
				return null;
			}
			using var context = new ComputerShopDatabase();
			return context.Batchs
				.FirstOrDefault(x => x.Id == model.Id)
				?.GetViewModel;
		}

		public BatchViewModel? Insert(BatchBindingModel model)
		{
			using var context = new ComputerShopDatabase();
			var newBatch = Batch.Create(context, model);

			if (newBatch == null)
			{
				return null;
			}
			context.Batchs.Add(newBatch);
			context.SaveChanges();

			return newBatch.GetViewModel;
		}

		public BatchViewModel? Update(BatchBindingModel model)
		{
			using var context = new ComputerShopDatabase();
			using var transaction = context.Database.BeginTransaction();
			try
			{
				var batch = context.Batchs.FirstOrDefault(x => x.Id == model.Id);
				if (batch == null)
				{
					return null;
				}
				batch.Update(model);
				context.SaveChanges();
				transaction.Commit();
				return context.Batchs
					.FirstOrDefault(x => x.Id == model.Id)?
					.GetViewModel;
			}
			catch
			{
				transaction.Rollback();
				throw;
			}
		}

		public BatchViewModel? Delete(BatchBindingModel model)
		{
			using var context = new ComputerShopDatabase();
			var batch = context.Batchs.FirstOrDefault(y => y.Id == model.Id);
			if (batch != null)
			{
				context.Batchs.Remove(batch);
				context.SaveChanges();
				return batch.GetViewModel;
			}
			return null;
		}
	}
}