package com.plannaplan.security;

import java.util.Arrays;
import java.util.Collection;
import java.util.List;

import com.plannaplan.entities.User;
import com.plannaplan.services.UserService;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.authentication.dao.AbstractUserDetailsAuthenticationProvider;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Component;

/**
 * Spring authentication provider
 */
@Component
public class AuthenticationProvider extends AbstractUserDetailsAuthenticationProvider {

    @Autowired
    private UserService userService;

    @Override
    protected void additionalAuthenticationChecks(UserDetails userDetails,
            UsernamePasswordAuthenticationToken authentication) throws AuthenticationException {
    }

    @Override
    protected UserDetails retrieveUser(String username, UsernamePasswordAuthenticationToken authentication)
            throws AuthenticationException {

        final String token = authentication.getCredentials().toString();
        User user = this.userService.getByToken(token)
                .orElseThrow(() -> new UsernameNotFoundException("Cannot find user with given authority"));
        UserDetails response = new UserDetails() {

            private static final long serialVersionUID = 1L;

            @Override
            public Collection<? extends GrantedAuthority> getAuthorities() {
                final AuthorityRoles role = AuthorityRoles.getAuthorityRole(user.getRole())
                        .orElseThrow(() -> new NullPointerException("Failed to get user role"));
                final List<AuthorityRoles> response = Arrays.asList(role);
                return response;
            }

            @Override
            public String getPassword() {
                return null;
            }

            @Override
            public String getUsername() {
                return user.getEmail();
            }

            @Override
            public boolean isAccountNonExpired() {
                return true;
            }

            @Override
            public boolean isAccountNonLocked() {
                return true;
            }

            @Override
            public boolean isCredentialsNonExpired() {
                if (user.isCredentialsNonExpired()) {
                    userService.save(user);
                    return true;
                }
                return false;
            }

            @Override
            public boolean isEnabled() {
                return true;
            }

        };

        return response;
    }

}