using RouteGuideContracts.BindingModels;
using RouteGuideContracts.SearchModels;
using RouteGuideContracts.StoragesContracts;
using RouteGuideContracts.ViewModels;
using RouteGuideDatabaseImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace RouteGuideDatabaseImplement.Implements
{
    /// <summary>
    /// Хранилище для сущности "Остановка"
    /// </summary>
    public class StopStorage : IStopStorage
    {
        /// <summary>
        /// Получение полного списка
        /// </summary>
        /// <returns></returns>
        public List<StopViewModel> GetFullList()
        {
            using var context = new RouteGuideDatabase();
            return context.Stops
                .Select(x => x.GetViewModel)
                .ToList();
        }

        /// <summary>
        /// Получение фильтрованного списка
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public List<StopViewModel> GetFilteredList(StopSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return new();
            }

            using var context = new RouteGuideDatabase();
            return context.Stops
                .Where(x => x.Id == model.Id)
                .Select(x => x.GetViewModel)
                .ToList();
        }

        /// <summary>
        /// Получение элемента
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public StopViewModel? GetElement(StopSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }

            using var context = new RouteGuideDatabase();
            return context.Stops
                .FirstOrDefault(x => (model.Id.HasValue && x.Id == model.Id))
                ?.GetViewModel;
        }

        /// <summary>
        /// Добавление элемента
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public StopViewModel? Insert(StopBindingModel model)
        {
            var newStop = Stop.Create(model);
            if (newStop == null)
            {
                return null;
            }

            using var context = new RouteGuideDatabase();
            context.Stops.Add(newStop);
            context.SaveChanges();
            return newStop.GetViewModel;
        }

        /// <summary>
        /// Редактирование элемента
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public StopViewModel? Update(StopBindingModel model)
        {
            using var context = new RouteGuideDatabase();
            var stop = context.Stops.FirstOrDefault(x => x.Id == model.Id);
            if (stop == null)
            {
                return null;
            }

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

        /// <summary>
        /// Удаление элемента
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public StopViewModel? Delete(StopBindingModel model)
        {
            using var context = new RouteGuideDatabase();
            var stop = context.Stops.FirstOrDefault(x => x.Id == model.Id);
            if (stop == null)
            {
                return null;
            }

            context.Stops.Remove(stop);
            context.SaveChanges();
            return stop.GetViewModel;
        }
    }
}