using IceCreamShopContracts.BindingModels;
using IceCreamShopContracts.SearchModels;
using IceCreamShopContracts.StoragesContracts;
using IceCreamShopContracts.ViewModels;
using IceCreamShopDatabaseImplement.Models;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace IceCreamShopDatabaseImplement.Implements
{
    public class IceCreamStorage : IIceCreamStorage
    {
        public List<IceCreamViewModel> GetFullList()
        {
            using var context = new IceCreamShopDataBase();
            return context.IceCreams
             .Include(x => x.Components)
            .ThenInclude(x => x.Component)
            .ToList()
            .Select(x => x.GetViewModel)
            .ToList();
        }
        public List<IceCreamViewModel> GetFilteredList(IceCreamSearchModel model)
        {
            if (string.IsNullOrEmpty(model.IceCreamName))
            {
                return new();
            }
            using var context = new IceCreamShopDataBase();
            return context.IceCreams.Include(x => x.Components)
            .ThenInclude(x => x.Component)
            .Where(x => x.IceCreamName.Contains(model.IceCreamName))
            .ToList()
            .Select(x => x.GetViewModel)
            .ToList();
        }
        public IceCreamViewModel? GetElement(IceCreamSearchModel model)
        {
            if (string.IsNullOrEmpty(model.IceCreamName) &&
            !model.Id.HasValue)
            {
                return null;
            }
            using var context = new IceCreamShopDataBase();
            return context.IceCreams
             .Include(x => x.Components)
             .ThenInclude(x => x.Component)
             .FirstOrDefault(x => (!string.IsNullOrEmpty(model.IceCreamName) &&
            x.IceCreamName == model.IceCreamName) ||
            (model.Id.HasValue && x.Id ==
            model.Id))
            ?.GetViewModel;
        }
        public IceCreamViewModel? Insert(IceCreamBindingModel model)
        {
            using var context = new IceCreamShopDataBase();
            var newIceCream = IceCream.Create(context, model);
            if (newIceCream == null)
            {
                return null;
            }
            context.IceCreams.Add(newIceCream);
            context.SaveChanges();
            return newIceCream.GetViewModel;
        }
        public IceCreamViewModel? Update(IceCreamBindingModel model)
        {
            using var context = new IceCreamShopDataBase();
            using var transaction = context.Database.BeginTransaction();
            try
            {
                var iceCream = context.IceCreams.FirstOrDefault(rec =>
                rec.Id == model.Id);
                if (iceCream == null)
                {
                    return null;
                }
                iceCream.Update(model);
                context.SaveChanges();
                iceCream.UpdateComponents(context, model);
                transaction.Commit();
                return iceCream.GetViewModel;
            }
            catch
            {
                transaction.Rollback();
                throw;
            }
        }
        public IceCreamViewModel? Delete(IceCreamBindingModel model)
        {
            using var context = new IceCreamShopDataBase();
            var element = context.IceCreams
            .Include(x => x.Components)
            .FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.IceCreams.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}