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

namespace AircraftPlantDatabaseImplement.Implements
{
    /// <summary>
    /// Реализация интерфейса хранилища для компонентов
    /// </summary>
    public class ComponentStorage : IComponentStorage
    {
        /// <summary>
        /// Получение полного списка
        /// </summary>
        /// <returns></returns>
        public List<ComponentViewModel> GetFullList()
        {
            using var context = new AircraftPlantDatabase();
            return context.Components
                .Select(x => x.GetViewModel)
                .ToList();
        }

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

            using var context = new AircraftPlantDatabase();
            return context.Components
                .Where(x => x.ComponentName.Contains(model.ComponentName))
                .Select(x => x.GetViewModel)
                .ToList();
        }

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

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

        /// <summary>
        /// Добавление элемента
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public ComponentViewModel? Insert(ComponentBindingModel model)
        {
            var newComponent = Component.Create(model);
            if (newComponent == null)
            {
                return null;
            }

            using var context = new AircraftPlantDatabase();
            context.Components.Add(newComponent);
            context.SaveChanges();
            return newComponent.GetViewModel;
        }

        /// <summary>
        /// Редактирование элемента
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public ComponentViewModel? Update(ComponentBindingModel model)
        {
            using var context = new AircraftPlantDatabase();
            var component = context.Components.FirstOrDefault(x => x.Id == model.Id);
            if (component == null)
            {
                return null;
            }

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

        /// <summary>
        /// Удаление элемента
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public ComponentViewModel? Delete(ComponentBindingModel model)
        {
            using var context = new AircraftPlantDatabase();
            var element = context.Components.FirstOrDefault(rec => rec.Id == model.Id);
            if (element == null)
            {
                return null;
            }

            context.Components.Remove(element);
            context.SaveChanges();
            return element.GetViewModel;
        }
    }
}