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 изделий
    /// </summary>
    public class PlaneStorage : IPlaneStorage
    {
        /// <summary>
        /// Получение полного списка
        /// </summary>
        /// <returns></returns>
        public List<PlaneViewModel> GetFullList()
        {
            using var context = new AircraftPlantDatabase();
            return context.Planes
                .Include(x => x.Components)
                .ThenInclude(x => x.Component)
                .ToList()
                .Select(x => x.GetViewModel)
                .ToList();
        }

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

            using var context = new AircraftPlantDatabase();
            return context.Planes
                .Include(x => x.Components)
                .ThenInclude(x => x.Component)
                .Where(x => x.PlaneName.Contains(model.PlaneName))
                .ToList()
                .Select(x => x.GetViewModel)
                .ToList();
        }

        /// <summary>
        /// Получение элемента
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public PlaneViewModel? GetElement(PlaneSearchModel model)
        {
            if (string.IsNullOrEmpty(model.PlaneName) && !model.Id.HasValue)
            {
                return null;
            }

            using var context = new AircraftPlantDatabase();
            return context.Planes
                .Include(x => x.Components)
                .ThenInclude(x => x.Component)
                .FirstOrDefault(x => (!string.IsNullOrEmpty(model.PlaneName) &&
                    x.PlaneName == model.PlaneName) ||
                    (model.Id.HasValue && x.Id == model.Id))
                ?.GetViewModel;
        }

        /// <summary>
        /// Добавление элемента
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public PlaneViewModel? Insert(PlaneBindingModel model)
        {
            using var context = new AircraftPlantDatabase();
            var newPlane = Plane.Create(context, model);
            if (newPlane == null)
            {
                return null;
            }

            context.Planes.Add(newPlane);
            context.SaveChanges();
            return newPlane.GetViewModel;
        }

        /// <summary>
        /// Редактирование элемента
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public PlaneViewModel? Update(PlaneBindingModel model)
        {
            using var context = new AircraftPlantDatabase();
            using var transaction = context.Database.BeginTransaction();
            try
            {
                var plane = context.Planes.FirstOrDefault(rec => rec.Id == model.Id);
                if (plane == null)
                {
                    return null;
                }

                plane.Update(model);
                context.SaveChanges();
                plane.UpdateComponents(context, model);
                transaction.Commit();
                return plane.GetViewModel;
            }
            catch
            {
                transaction.Rollback();
                throw;
            }
        }

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