public async Task Register(Registration registration)
{
if (IsValid(registration))
{
var existingTournament = _tournamentRepository.Exist(tournament => tournament.Id.Equals(registration.TournamentId));
var existingTeam = _teamRepository.Exist(team => team.Id.Equals(registration.TeamId));
var existingRegistration = _registrationRepository.Exist(reg => reg.TournamentId.Equals(registration.TournamentId) &&
reg.TeamId.Equals(registration.TeamId));
if (existingTournament && existingTeam && !existingRegistration)
{
await _registrationRepository.Register(registration);
}
}
}
