using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using TransportGuideContracts.BindingModels;
using TransportGuideContracts.SearchModels;
using TransportGuideContracts.StoragesContracts;
using TransportGuideContracts.ViewModels;
using TransportGuideDatabaseImplements.Models;

namespace TransportGuideDatabaseImplements.Implements
{
	public class StopStorage : IStopStorage
	{
		public StopViewModel? Delete(StopBindingModel model)
		{
			using var context = new TransportGuideDB();

			var element = context.Stops.FirstOrDefault(rec => rec.Id == model.Id);

			if (element != null)
			{
				context.Stops.Remove(element);
				context.SaveChanges();
				return element.GetViewModel;
			}

			return null;
		}

		public StopViewModel? GetElement(StopSearchModel model)
		{
			if (string.IsNullOrEmpty(model.Name) && !model.Id.HasValue)
			{
				return null;
			}

			using var context = new TransportGuideDB();

			return context.Stops.FirstOrDefault(x => (!string.IsNullOrEmpty(model.Name) && x.Name == model.Name) || (model.Id.HasValue && x.Id == model.Id))?.GetViewModel;
		}

		public List<StopViewModel> GetFilteredList(StopSearchModel model)
		{
			if (string.IsNullOrEmpty(model.Name))
			{
				return new();
			}

			using var context = new TransportGuideDB();

			return context.Stops.Where(x => x.Name.Contains(model.Name)).Select(x => x.GetViewModel).ToList();
		}

		public List<StopViewModel> GetFullList()
		{
			using var context = new TransportGuideDB();

			return context.Stops.Select(x => x.GetViewModel).ToList();
		}

		public StopViewModel? Insert(StopBindingModel model)
		{
			var newStop = Stop.Create(model);

			if (newStop == null)
			{
				return null;
			}

			using var context = new TransportGuideDB();

			context.Stops.Add(newStop);
			context.SaveChanges();

			return newStop.GetViewModel;
		}

		public StopViewModel? Update(StopBindingModel model)
		{
			using var context = new TransportGuideDB();

			var Stop = context.Stops.FirstOrDefault(x => x.Id == model.Id);

			if (Stop == null)
			{
				return null;
			}

			Stop.Update(model);
			context.SaveChanges();

			return Stop.GetViewModel;
		}
	}
}