using FoodOrdersContracts.BindingModels;
using FoodOrdersContracts.SearchModels;
using FoodOrdersContracts.ViewModels;
using FoodOrdersDatabaseImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection.Metadata;
using System.Text;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;
using System.Xml.Linq;
using FoodOrdersContracts.StoragesContracts;
using System.Runtime.ConstrainedExecution;

namespace FoodOrdersDatabaseImplement.Implements
{
    public class DishStorage : IDishStorage
    {
        public List<DishViewModel> GetFullList()
        {
            using var context = new FoodOrdersDatabase();
            return context.Dishs
            .Include(x => x.Components)
            .ThenInclude(x => x.Component)
            .ToList()
            .Select(x => x.GetViewModel)
            .ToList();
        }

        public List<DishViewModel> GetFilteredList(DishSearchModel model)
        {
            if (string.IsNullOrEmpty(model.DishName))
            {
                return new();
            }
            using var context = new FoodOrdersDatabase();
            return context.Dishs
            .Include(x => x.Components)
            .ThenInclude(x => x.Component)
            .Where(x => x.DishName.Contains(model.DishName))
            .ToList()
            .Select(x => x.GetViewModel)
            .ToList();
        }

        public DishViewModel? GetElement(DishSearchModel model)
        {
            if (string.IsNullOrEmpty(model.DishName) && !model.Id.HasValue)
            {
                return null;
            }
            using var context = new FoodOrdersDatabase();
            return context.Dishs.Include(
                    x => x.Components
                ).ThenInclude(x => x.Component).FirstOrDefault(x => (
                    !string.IsNullOrEmpty(model.DishName) &&
                    x.DishName == model.DishName) || (model.Id.HasValue && x.Id == model.Id)
                )?.GetViewModel;
        }

        public DishViewModel? Insert(DishBindingModel model)
        {
            using var context = new FoodOrdersDatabase();
            using var transaction = context.Database.BeginTransaction();
            {
                try
                {
                    var newDish = Dish.Create(context, model);
                    if (newDish == null)
                    {
                        transaction.Rollback();
                        return null;
                    }
                    context.Dishs.Add(newDish);

                    context.SaveChanges();
                    context.Database.CommitTransaction();

                    return newDish.GetViewModel;
                }
                catch (Exception)
                {
                    transaction.Rollback();
                    return null;
                }
            }
        }

        public DishViewModel? Update(DishBindingModel model)
        {
            using var context = new FoodOrdersDatabase();
            using var transaction = context.Database.BeginTransaction();
            {
                try
                {
                    var Dish = context.Dishs.FirstOrDefault(x => x.Id == model.Id);
                    if (Dish == null)
                    {
                        transaction.Rollback();
                        return null;
                    }

                    Dish.Update(model);
                    Dish.UpdateComponents(context, model);

                    context.SaveChanges();
                    context.Database.CommitTransaction();

                    return Dish.GetViewModel;
                }
                catch (Exception)
                {
                    transaction.Rollback();
                    return null;
                }
            }
        }
        public DishViewModel? Delete(DishBindingModel model)
        {
            using var context = new FoodOrdersDatabase();
            var element = context.Dishs.FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Dishs.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}