using ClientsContracts.StorageContracts;
using ClientsContracts.BindingModels;
using ClientsContracts.ViewModels;
using ClientsDatabaseImplement.Models;

namespace ClientsDatabaseImplement.Implements
{
	public class StatusStorage : IStatusStorage
	{
		public void Delete(StatusBindingModel model)
		{
			var context = new ClientsDatabase();
			var status = context.Statuses.FirstOrDefault(rec => rec.Id == model.Id);
			if (status != null)
			{
				context.Statuses.Remove(status);
				context.SaveChanges();
			}
			else
			{
				throw new Exception("Статус не найден");
			}
		}

		public StatusViewModel GetElement(StatusBindingModel model)
		{
			if (model == null)
			{
				return null;
			}
			using var context = new ClientsDatabase();

			var status = context.Statuses
					.ToList()
					.FirstOrDefault(rec => rec.Id == model.Id || rec.Name == model.Name);
			return status != null ? CreateModel(status) : null;
		}


		public List<StatusViewModel> GetFilteredList(StatusBindingModel model)
		{
			if (model == null)
			{
				return null;
			}
			using var context = new ClientsDatabase();
			return context.Statuses
				.Where(rec => rec.Name.Contains(model.Name))
				.Select(CreateModel)
				.ToList();
		}

		public List<StatusViewModel> GetFullList()
		{
			using var context = new ClientsDatabase();
			return context.Statuses
				.Select(CreateModel)
				.ToList();
		}

		public void Insert(StatusBindingModel model)
		{
			var context = new ClientsDatabase();
			var transaction = context.Database.BeginTransaction();
			try
			{
				context.Statuses.Add(CreateModel(model, new Status()));
				context.SaveChanges();
				transaction.Commit();
			}
			catch
			{
				transaction.Rollback();
				throw;
			}
		}

		public void Update(StatusBindingModel model)
		{
			var context = new ClientsDatabase();
			var transaction = context.Database.BeginTransaction();
			try
			{
				var status = context.Statuses.FirstOrDefault(rec => rec.Id == model.Id);
				if (status == null)
				{
					throw new Exception("Статус не найден");
				}
				CreateModel(model, status);
				context.SaveChanges();
				transaction.Commit();
			}
			catch
			{
				transaction.Rollback();
				throw;
			}
		}

		private static Status CreateModel(StatusBindingModel model, Status status)
		{
			status.Name = model.Name;
			return status;
		}

		private static StatusViewModel CreateModel(Status status)
		{
			return new StatusViewModel
			{
				Id = status.Id,
				Name = status.Name
			};
		}
	}
}