package com.guwan.backend.security;

import com.guwan.backend.dto.user.UserDTO;
import com.guwan.backend.service.UserService;
import lombok.RequiredArgsConstructor;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
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 java.util.ArrayList;
import java.util.List;

@Service
@RequiredArgsConstructor
public class UserDetailsServiceImpl implements UserDetailsService {

    private final UserService userService;

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        UserDTO user = userService.findByUsername(username);
        if (user == null) {
            throw new UsernameNotFoundException("用户不存在");
        }
        return convertToUserDetailsWithoutPassword(user);
    }

    public UserDetails loadUserById(Long userId) throws UsernameNotFoundException {
        UserDTO user = userService.getUserById(userId);
        if (user == null) {
            throw new UsernameNotFoundException("用户不存在");
        }
        return convertToUserDetailsWithoutPassword(user);
    }



    private UserDetails convertToUserDetailsWithoutPassword(UserDTO user) {
        List<SimpleGrantedAuthority> authorities = new ArrayList<>();
        authorities.add(new SimpleGrantedAuthority("ROLE_USER"));
        
        return new CustomUserDetails(
            user.getId(),
            user.getUsername(),
            null,
            authorities,
            user.getStatus() == 1
        );
    }
}