using RouteGuideContracts.BindingModels;
using RouteGuideContracts.SearchModels;
using RouteGuideContracts.StoragesModels;
using RouteGuideContracts.ViewModels;
using RouteGuideDatabaseImplements.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

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

            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 RouteGuideDatabase();

            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 RouteGuideDatabase();

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

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

            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 RouteGuideDatabase();

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

            return newStop.GetViewModel;
        }

        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;
        }
    }
}