package com.kamco.cd.kamcoback.auth;

import com.kamco.cd.kamcoback.postgres.entity.MemberEntity;
import com.kamco.cd.kamcoback.postgres.repository.members.MembersRepository;
import lombok.RequiredArgsConstructor;
import org.mindrot.jbcrypt.BCrypt;
import org.springframework.security.authentication.AuthenticationProvider;
import org.springframework.security.authentication.BadCredentialsException;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
import org.springframework.stereotype.Component;

@Component
@RequiredArgsConstructor
public class CustomAuthenticationProvider implements AuthenticationProvider {

  private final MembersRepository membersRepository;

  @Override
  public Authentication authenticate(Authentication authentication) throws AuthenticationException {
    String username = authentication.getName();
    String rawPassword = authentication.getCredentials().toString();

    // 1. 유저 조회
    MemberEntity member =
        membersRepository
            .findByUserId(username)
            .orElseThrow(() -> new BadCredentialsException("ID 또는 비밀번호가 일치하지 않습니다."));

    // 2. jBCrypt + 커스텀 salt 로 저장된 패스워드 비교
    if (!BCrypt.checkpw(rawPassword, member.getPassword())) {
      throw new BadCredentialsException("ID 또는 비밀번호가 일치하지 않습니다.");
    }

    // 3. 인증 성공 → UserDetails 생성
    CustomUserDetails userDetails = new CustomUserDetails(member);

    return new UsernamePasswordAuthenticationToken(userDetails, null, userDetails.getAuthorities());
  }

  @Override
  public boolean supports(Class<?> authentication) {
    return UsernamePasswordAuthenticationToken.class.isAssignableFrom(authentication);
  }
}
