using Microsoft.EntityFrameworkCore;
using SchoolContracts.BindingModel;
using SchoolContracts.BindingModels;
using SchoolContracts.SearchModel;
using SchoolContracts.StoragesContracts;
using SchoolContracts.ViewModels;
using SchoolDatabaseImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SchoolDatabaseImplement.Implements
{
	public class PaymentStorage : IPaymentStorage
	{
		public List<PaymentViewModel> GetFullList()
		{
			using var context = new SchoolDatabase();
			return context.Payments
			.Include(rec => rec.Lesson)
			.Select(x => x.GetViewModel)
		   .ToList();
		}

		public List<PaymentViewModel> GetFilteredList(PaymentSearchModel model)
		{
			if (model == null)
			{
				return null;
			}
			using var context = new SchoolDatabase();
			var list = context.Payments.Where(x => x.LessonId == model.LessonId)
			.OrderBy(x => x.DateOfPayment)
			.Include(x => x.Lesson);
			return list
			.Select(x => new PaymentViewModel
			{
				DateOfPayment = x.DateOfPayment,
				Id = x.Id,
				Remains = x.Remains,
				Sum = x.Sum,
				LessonId = x.LessonId
			})
			 .ToList();
		}
		public PaymentViewModel GetElement(PaymentSearchModel model)
		{
			if (model == null)
			{
				return null;
			}
			 using var context = new SchoolDatabase();
			{
				var payment = context.Payments.Include(x=> x.Lesson)
				  .FirstOrDefault(x => x.LessonId == model.LessonId);
				return payment != null? new PaymentViewModel
				{
					DateOfPayment = payment.DateOfPayment,
					Id = payment.Id,
					Remains = payment.Lesson.LessonPrice,
					Sum = payment.Sum,
					LessonId = payment.LessonId
				} :
				null;
			}
		}
		public PaymentViewModel? Insert(PaymentBindingModel model)
		{
			var context = new SchoolDatabase();
			var newPayment = Payment.Create(context, model);
			if (newPayment == null)
			{
				return null;
			}
			context.Payments.Add(newPayment);
			context.SaveChanges();
			return newPayment.GetViewModel;
		}

		public PaymentViewModel? Update(PaymentBindingModel model)
		{
			var context = new SchoolDatabase();
			var element = context.Payments.
				Include(x => x.Lesson)
				.FirstOrDefault(rec => rec.Id == model.Id);
			if (element == null)
			{
				throw new Exception("Оплата не найдена");
			}
			element.Update(model);
			context.SaveChanges();
			return element.GetViewModel;
		}
		public PaymentViewModel? Delete(PaymentBindingModel model)
		{
			var context = new SchoolDatabase();

			var element = context.Payments
				.Include(x => x.Lesson)
				.FirstOrDefault(rec => rec.Id == model.Id);
			if (element != null)
			{
				context.Payments.Remove(element);
				context.SaveChanges();
				return element?.GetViewModel;
			}
			else
			{
				throw new Exception("Оплата не найдена");
			}
		}
	}
}