package es.uv.garcosda.security;

import java.util.Collection;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.AuthorityUtils;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import es.uv.garcosda.domain.User;
import es.uv.garcosda.repositories.UserRepository;


@Service
@Transactional
public class CustomUserDetailsService implements UserDetailsService {

	@Autowired
	private UserRepository userRepository;
	
	@Override
	public UserDetails loadUserByUsername(String userName)
			throws UsernameNotFoundException {
		User user = userRepository.findByUsername(userName)
								  .orElseThrow(() -> new UsernameNotFoundException("User "+userName+" not found"));
		return new org.springframework.security.core.userdetails.User(
				user.getUsername(), 
				user.getPassword(),
				getAuthorities(user));
	}

	
	private static Collection<? extends GrantedAuthority> getAuthorities(User user) {		
		String[] userRoles = user.getRoles()
								 .stream()
								 .map((role) -> role.getName())
								 .toArray(String[]::new);
		Collection<GrantedAuthority> authorities = AuthorityUtils.createAuthorityList(userRoles);
		return authorities;
	}
}