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

namespace AircraftPlantDatabaseImplement.Implements
{
    /// <summary>
    /// Реализация интерфейса хранилища для исполнителей
    /// </summary>
    public class ImplementerStorage : IImplementerStorage
    {
        /// <summary>
        /// Получение полного списка
        /// </summary>
        /// <returns></returns>
        public List<ImplementerViewModel> GetFullList()
        {
            using var context = new AircraftPlantDatabase();
            return context.Implementers
                    .Include(x => x.Orders)
                    .Select(x => x.GetViewModel)
                    .ToList();
        }

        /// <summary>
        /// Получение фильтрованного списка
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public List<ImplementerViewModel> GetFilteredList(ImplementerSearchModel model)
        {
            if (string.IsNullOrEmpty(model.ImplementerFIO))
            {
                return new();
            }

            using var context = new AircraftPlantDatabase();
            return context.Implementers
                    .Include(x => x.Orders)
                    .Where(x => x.ImplementerFIO.Contains(model.ImplementerFIO))
                    .Select(x => x.GetViewModel)
                    .ToList();
        }

        /// <summary>
        /// Получение элемента
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public ImplementerViewModel? GetElement(ImplementerSearchModel model)
        {
            using var context = new AircraftPlantDatabase();
            if (model.Id.HasValue)
                return context.Implementers
                    .Include(x => x.Orders)
                    .FirstOrDefault(x => model.Id.HasValue && x.Id == model.Id)?
                    .GetViewModel;
            
            else if (!string.IsNullOrEmpty(model.ImplementerFIO) && !string.IsNullOrEmpty(model.Password))
                return context.Implementers.Include(x => x.Orders)
                    .FirstOrDefault(x => x.ImplementerFIO == model.ImplementerFIO && x.Password == model.Password)?
                    .GetViewModel;

            else if (!string.IsNullOrEmpty(model.ImplementerFIO))
                return context.Implementers.Include(x => x.Orders)
                    .FirstOrDefault(x => x.ImplementerFIO == model.ImplementerFIO)?
                    .GetViewModel;

            return null;
        }

        /// <summary>
        /// Добавление элемента
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public ImplementerViewModel? Insert(ImplementerBindingModel model)
        {
            var newImplementer = Implementer.Create(model);
            if (newImplementer == null)
            {
                return null;
            }

            using var context = new AircraftPlantDatabase();
            context.Implementers.Add(newImplementer);
            context.SaveChanges();
            return newImplementer.GetViewModel;
        }

        /// <summary>
        /// Редактирование элемента
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public ImplementerViewModel? Update(ImplementerBindingModel model)
        {
            using var context = new AircraftPlantDatabase();
            var implementer = context.Implementers.Include(x => x.Orders).FirstOrDefault(x => x.Id == model.Id);
            if (implementer == null)
            {
                return null;
            }

            implementer.Update(model);
            context.SaveChanges();
            return implementer.GetViewModel;
        }

        /// <summary>
        /// Удаление элемента
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public ImplementerViewModel? Delete(ImplementerBindingModel model)
        {
            using var context = new AircraftPlantDatabase();
            var element = context.Implementers.Include(x => x.Orders).FirstOrDefault(x => x.Id == model.Id);
            if (element != null)
            {
                context.Implementers.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}