using Microsoft.EntityFrameworkCore;
using OnlineShopContracts.BindingModels;
using OnlineShopContracts.ViewModels;
using OnlineShopDatabase.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;

namespace OnlineShopDatabase.Storages
{
    public class OrderStorage
    {
        public List<OrderViewModel> GetFullList()
        {
            using var context = new OnlineShopDatabase();
            return context.Orders.Select(x => x.GetViewModel).ToList();
        }

        public List<OrderViewModel> GetFilteredList(OrderBindingModel model)
        {
            using var context = new OnlineShopDatabase();
            //либо поиск по ФИО заказчика
            if (!string.IsNullOrEmpty(model.FIO))
            {
                return context.Orders
                    .Where(x => x.FIO == model.FIO)
                    .Select(x => x.GetViewModel)
                    .ToList();
            }
            //либо по статусу заказа
            else if (!string.IsNullOrEmpty(model.Status))
            {
                return context.Orders
                    .Where(x => x.Status == model.Status)
                    .Select(x => x.GetViewModel)
                    .ToList();
            }
            //либо по стоимости
            else if (model.Sum.HasValue)
            {
                return context.Orders
                    .Where(x => x.Sum == model.Sum)
                    .Select(x => x.GetViewModel)
                    .ToList();
            }
            return new();
        }

        //получение по id заказа
        public OrderViewModel? GetElement(OrderBindingModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }
            using var context = new OnlineShopDatabase();
            return context.Orders.FirstOrDefault(x => x.Id == model.Id)?.GetViewModel;
        }

        public bool Insert(OrderBindingModel model)
        {
            var newOrder = Order.Create(model);

            if (newOrder == null)
            {
                return false;
            }
            using var context = new OnlineShopDatabase();
            using var transaction = context.Database.BeginTransaction();
            try
            {
                context.Orders.Add(newOrder);
                context.SaveChanges();
                transaction.Commit();
                return true;
            }
            catch (Exception ex)
            {
                transaction.Rollback();
                return false;
                throw;
            }
        }

        public bool Update(OrderBindingModel model)
        {
            using var context = new OnlineShopDatabase();
            using var transaction = context.Database.BeginTransaction();
            try
            {
                var order = context.Orders.FirstOrDefault(x => x.Id == model.Id);
                if (order == null)
                {
                    throw new Exception("Заказ не найден");
                }
                order.Update(model);
                context.SaveChanges();
                transaction.Commit();
                return true;
            }
            catch
            {
                transaction.Rollback();
                return false;
            }
        }

        public bool Delete(OrderBindingModel model)
        {
            using var context = new OnlineShopDatabase();
            using var transaction = context.Database.BeginTransaction();
            try
            {
                var order = context.Orders.FirstOrDefault(rec => rec.Id == model.Id);
                if (order == null)
                {
                    throw new Exception("Заказ не найден");
                }
                context.Orders.Remove(order);
                context.SaveChanges();
                transaction.Commit();
                return true;
            }
            catch
            {
                transaction.Rollback();
                return false;
            }
        }
    }
}