using Contracts.BindingModels;
using Contracts.SearchModel;
using Contracts.Storage;
using Contracts.ViewModels;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DataBase.Implements
{
    public class CarStorage : ICarStorage
    {
        public List<CarVM> GetFullList()
        {
            using var context = new LogisticContext();
            return context.Cars.FromSqlRaw("Select * from Car")
                    .Include(u => u.Status)
                    .ToList()
                    .Select(x => x.GetViewModel)
                    .ToList();
           
        }

        public List<CarVM> GetFilteredList(CarSM model)
        {
            if (!model.StatusId.HasValue && !model.Tonnage.HasValue)
            {
                return new();
            }
            using var context = new LogisticContext();
            if(model.StatusId.HasValue)
            return context.Cars
                    .FromSqlRaw("Select * FROM Car WHERE status_id = {0}", model.StatusId)
                    .Include(u => u.Status)
                    .ToList()
                    .Select(x => x.GetViewModel)
                    .ToList();
            else
            return context.Cars
                    .FromSqlRaw("Select * FROM Car WHERE Tonnage >= {0}", model.Tonnage)
                    .Include(u => u.Status)
                    .ToList()
                    .Select(x => x.GetViewModel)
                    .ToList();
        }

        public CarVM? GetElement(CarSM model)
        {
            if ( !model.Id.HasValue)
            {
                return null;
            }
            using var context = new LogisticContext();
            return context.Cars
                .FirstOrDefault(x => (model.Id.HasValue && x.Id == model.Id))
                ?.GetViewModel;
        }

        public CarVM? Insert(CarBM model)
        {
            using var context = new LogisticContext();
            var newCar = Car.Create(context, model);
            if (newCar == null)
            {
                return null;
            }
            context.Cars.Add(newCar);
            context.SaveChanges();
            return newCar.GetViewModel;
        }

        public CarVM? Update(CarBM model)
        {
            using var context = new LogisticContext();
            using var transaction = context.Database.BeginTransaction();
            try
            {
                var car = context.Cars.FirstOrDefault(rec => rec.Id == model.Id);
                if (car == null)
                {
                    return null;
                }
                car.Update(model);
                context.SaveChanges();
                transaction.Commit();
                return car.GetViewModel;
            }
            catch
            {
                transaction.Rollback();
                throw;
            }
        }

        public CarVM? Delete(CarBM model)
        {
            using var context = new LogisticContext();
            var element = context.Cars
                .FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Cars.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}