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

namespace ConfectioneryDatabaseImplement.Implements
{
    public class SweetsStorage : ISweetsStorage
    {
        public List<SweetsViewModel> GetFullList()
        {
            using var context = new ConfectioneryDatabase();
            return context.ListSweets
                    .Include(x => x.Ingredients)
                    .ThenInclude(x => x.Ingredient)
                    .ToList()
                    .Select(x => x.GetViewModel)
                    .ToList();
        }

        public List<SweetsViewModel> GetFilteredList(SweetsSearchModel model)
        {
            if (string.IsNullOrEmpty(model.SweetsName))
            {
                return new();
            }
            using var context = new ConfectioneryDatabase();
            return context.ListSweets
                    .Include(x => x.Ingredients)
                    .ThenInclude(x => x.Ingredient)
                    .Where(x => x.SweetsName.Contains(model.SweetsName))
                    .ToList()
                    .Select(x => x.GetViewModel)
                    .ToList();
        }

        public SweetsViewModel? GetElement(SweetsSearchModel model)
        {
            if (string.IsNullOrEmpty(model.SweetsName) && !model.Id.HasValue)
            {
                return null;
            }
            using var context = new ConfectioneryDatabase();
            return context.ListSweets
                .Include(x => x.Ingredients)
                .ThenInclude(x => x.Ingredient)
                .FirstOrDefault(x => (!string.IsNullOrEmpty(model.SweetsName) && x.SweetsName == model.SweetsName) ||
                                (model.Id.HasValue && x.Id == model.Id))
                ?.GetViewModel;
        }

        public SweetsViewModel? Insert(SweetsBindingModel model)
        {
            using var context = new ConfectioneryDatabase();
            var newSweets = Sweets.Create(context, model);
            if (newSweets == null)
            {
                return null;
            }
            context.ListSweets.Add(newSweets);
            context.SaveChanges();
            return newSweets.GetViewModel;
        }

        public SweetsViewModel? Update(SweetsBindingModel model)
        {
            using var context = new ConfectioneryDatabase();
            using var transaction = context.Database.BeginTransaction();
            try
            {
                var sweets = context.ListSweets.FirstOrDefault(rec => rec.Id == model.Id);
                if (sweets == null)
                {
                    return null;
                }
                sweets.Update(model);
                context.SaveChanges();
                sweets.UpdateIngredients(context, model);
                transaction.Commit();
                return sweets.GetViewModel;
            }
            catch
            {
                transaction.Rollback();
                throw;
            }
        }

        public SweetsViewModel? Delete(SweetsBindingModel model)
        {
            using var context = new ConfectioneryDatabase();
            var element = context.ListSweets
                .Include(x => x.Ingredients)
                .Include(x => x.Orders)
                .FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.ListSweets.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}