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

namespace RestaurantDatabaseImplement.Implements
{
    public class ComponentStorage : IComponentStorage
    {
        public List<ComponentViewModel> GetFullList()
        {
            using var context = new RestaurantDatabase();
            return context.Components
             .Include(x => x.Providers)
            .ThenInclude(x => x.Provider)
            .ToList()
            .Select(x => x.GetViewModel)
            .ToList();
        }
        public List<ComponentViewModel> GetFilteredList(ComponentSearchModel model)
        {
            using var context = new RestaurantDatabase();
            if (model.Id.HasValue)
            {
                return context.Components
                    .Include(x => x.Providers)
                    .ThenInclude(x => x.ProviderId)
                    .Where(x => x.Id == model.Id)
                    .Select(x => x.GetViewModel)
                    .ToList();
            }
            else if (model.Name != null)
            {
                return context.Components
                    .Include(x => x.Providers)
                    .ThenInclude(x => x.ProviderId)
                    .Where(x => x.Name == model.Name)
                    .Select(x => x.GetViewModel)
                    .ToList();
            }
            else
            {
                return new();
            }
        }
        public ComponentViewModel? GetElement(ComponentSearchModel model)
        {
            if (string.IsNullOrEmpty(model.Name) &&
            !model.Id.HasValue)
            {
                return null;
            }
            using var context = new RestaurantDatabase();
            return context.Components
             .Include(x => x.Providers)
             .ThenInclude(x => x.Provider)
             .FirstOrDefault(x => (!string.IsNullOrEmpty(model.Name) &&
            x.Name == model.Name) ||
            (model.Id.HasValue && x.Id ==
            model.Id))
            ?.GetViewModel;
        }
        public ComponentViewModel? Insert(ComponentBindingModel model)
        {
            using var context = new RestaurantDatabase();
            var newComponent = Component.Create(context, model);
            if (newComponent == null)
            {
                return null;
            }
            context.Components.Add(newComponent);
            context.SaveChanges();
            return newComponent.GetViewModel;
        }
        public ComponentViewModel? Update(ComponentBindingModel model)
        {
            using var context = new RestaurantDatabase();
            var element = context.Components
                .Include(x => x.Providers)
                .ThenInclude(x => x.ProviderId)
                .FirstOrDefault(x => x.Id == model.Id);
            if (element == null)
            {
                return null;
            }
            element.Update(model);
            context.SaveChanges();
            return GetElement(new ComponentSearchModel { Id = element.Id });
        }
        public ComponentViewModel? Delete(ComponentBindingModel model)
        {
            using var context = new RestaurantDatabase();
            var element = context.Components
            .Include(x => x.Providers)
            .FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Components.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }

    }
}