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

namespace SchoolDatabaseImplements.Implements
{
	internal class ExpenseStorage : IExpenseStorage
	{
		public ExpenseViewModel? Delete(ExpenseBindingModel model)
		{
			using var context = new SchoolDatabase();
			var element = context.Expenses.FirstOrDefault(x => x.Id == model.Id);
			if (element != null)
			{
				context.Expenses.Remove(element);
				context.SaveChanges();
				return element.GetViewModel;
			}
			return null;
		}

		public ExpenseViewModel GetElement(ExpenseSearchModel model)
		{
			using var context = new SchoolDatabase();
			if (model.Id.HasValue)//сначала ищем по Id
			{
				return context.Expenses
					.FirstOrDefault(x => x.Id == model.Id)?.GetViewModel;
			}
			if (!string.IsNullOrEmpty(model.ExpenseName))//затем по названию
			{
				return context.Expenses
					.FirstOrDefault(x => x.ExpenseName == model.ExpenseName)?.GetViewModel;
			}
			return null;
		}

		public List<ExpenseViewModel> GetFilteredList(ExpenseSearchModel model)
		{
			using var context = new SchoolDatabase();
			return context.Expenses
				.Where (x => x.Id == model.Id)
				.Select(x => x.GetViewModel)
				.ToList();
		}

		public List<ExpenseViewModel> GetFullList()
		{
			using var context = new SchoolDatabase();
			return context.Expenses
				.Select(x => x.GetViewModel)
				.ToList();
		}

		public ExpenseViewModel? Insert(ExpenseBindingModel model)
		{
			using var context = new SchoolDatabase();
			var newExpense = Expense.Create(context, model);
			if (newExpense == null)
			{
				return null;
			}
			context.Expenses.Add(newExpense);
			context.SaveChanges();
			return newExpense.GetViewModel;
		}

		public ExpenseViewModel? Update(ExpenseBindingModel model)
		{
			using var context = new SchoolDatabase();
			var expense = context.Expenses.FirstOrDefault(x => x.Id == model.Id);
			if (expense == null)
			{
				return null;
			}
			expense.Update(model);
			context.SaveChanges();
			return expense.GetViewModel;
		}
	}
}