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

namespace ClientsDatabaseImplement.Implements
{
	public class ClientStorage : IClientStorage
	{
		public void Delete(ClientBindingModel model)
		{
			var context = new ClientsDatabase();
			var client = context.Clients.FirstOrDefault(rec => rec.Id == model.Id);
			if (client != null)
			{
				context.Clients.Remove(client);
				context.SaveChanges();
			}
			else
			{
				throw new Exception("Клиент не найден");
			}
		}

		public ClientViewModel GetElement(ClientBindingModel model)
		{
			if (model == null)
			{
				return null;
			}
			using var context = new ClientsDatabase();
			var client = context.Clients
					.ToList()
					.FirstOrDefault(rec => rec.Id == model.Id);
			return client != null ? CreateModel(client) : null;
		}

		public List<ClientViewModel> GetFilteredList(ClientBindingModel model)
		{
			var context = new ClientsDatabase();
			return context.Clients
				.Where(client => client.Name.Contains(model.Name) && client.Status.Contains(model.Status))
				.ToList()
				.Select(CreateModel)
				.ToList();
		}

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

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

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

		private static Client CreateModel(ClientBindingModel model, Client client)
		{
			client.Amount = model.Amount;
			client.Name = model.Name;
			client.Status = model.Status;
			client.Reviews = model.Reviews;

			return client;
		}

		private ClientViewModel CreateModel(Client client)
		{
			return new ClientViewModel
			{
				Id = client.Id,
				Amount = client.Amount,
				Name = client.Name,
				Status = client.Status,
				Reviews = client.Reviews
			};
		}
	}
}