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 ClientStorage : IClientStorage
    {
        public ClientViewModel? Delete(ClientBindingModel model)
        {
            using var context = new RestaurantDatabase();
            var element = context.Clients
                .FirstOrDefault(x => x.Id == model.Id);
            if (element == null)
            {
                return null;
            }
            context.Clients.Remove(element);
            return element.GetViewModel;
        }

        public ClientViewModel? GetElement(ClientSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }
            using var context = new RestaurantDatabase();
            return context.Clients
                .FirstOrDefault(x => model.Id.HasValue && x.Id == model.Id)?.GetViewModel;
        }

        public List<ClientViewModel> GetFilteredList(ClientSearchModel model)
        {
            using var context = new RestaurantDatabase();
            if (model.Id.HasValue)
            {
                return context.Clients
                    .Where(x => x.Id == model.Id)
                    .Select(x => x.GetViewModel)
                    .ToList();
            }
            else if (model.Number != null)
            {
                return context.Clients
                    .Where(x => x.Number == model.Number)
                    .Select(x => x.GetViewModel)
                    .ToList();
            }
            else if (model.FirstName != null && model.LastName != null)
            {
                return context.Clients
                    .Where(x => (x.FirstName == model.FirstName && x.LastName == model.LastName))
                    .Select(x => x.GetViewModel)
                    .ToList();
            }
            else
            {
                return new();
            }
        }

        public List<ClientViewModel> GetFullList()
        {
            using var context = new RestaurantDatabase();
            return context.Clients
            .ToList()
            .Select(x => x.GetViewModel)
            .ToList();
        }

        public ClientViewModel? Insert(ClientBindingModel model)
        {
            var newClient = Client.Create(model);
            if (newClient == null)
            {
                return null;
            }
            using var context = new RestaurantDatabase();
            context.Clients.Add(newClient);
            context.SaveChanges();
            return newClient.GetViewModel;
        }

        public ClientViewModel? Update(ClientBindingModel model)
        {
            using var context = new RestaurantDatabase();
            var element = context.Clients
                .FirstOrDefault(x => x.Id == model.Id);
            if (element == null)
            {
                return null;
            }
            element.Update(model);
            context.SaveChanges();
            return element.GetViewModel;
        }
    }
}