package com.mydreamjob.auth;

import com.mydreamjob.audit.AuditService;
import com.mydreamjob.common.exception.BusinessException;
import com.mydreamjob.common.exception.ErrorCode;
import com.mydreamjob.deletion.AccountDeletion;
import com.mydreamjob.deletion.AccountDeletionPhoneHasher;
import com.mydreamjob.deletion.AccountDeletionRepository;
import com.mydreamjob.deletion.DeletionStatus;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.*;

/**
 * Mock 认证服务 - 仅用于开发/测试环境登录原型
 */
@Slf4j
@Service
@RequiredArgsConstructor
public class AuthService {

    private final UserRepository userRepository;
    private final JwtTokenProvider jwtTokenProvider;
    private final SmsVerificationService smsVerificationService;
    private final AuditService auditService;
    private final AccountDeletionRepository accountDeletionRepository;
    private final AccountDeletionPhoneHasher accountDeletionPhoneHasher;

    /**
     * Mock 登录：验证短信验证码后自动创建/登录用户
     */
    @Transactional
    public Map<String, Object> mockLogin(String phone, String code, String purpose,
                                          String requestId, String ipAddress, String userAgent) {
        // 验证验证码（传入 purpose，确保验证码用途匹配）
        smsVerificationService.verifyCode(phone, code, purpose);

        // 原手机号禁止重新注册：已注销账号的手机号墓碑（HMAC 摘要）命中则拒绝，
        // 且不得自动创建新用户（不把原手机号明文写入注销表或审计）。
        String phoneHash = accountDeletionPhoneHasher.hash(phone);
        if (accountDeletionRepository.findByDeletedPhoneHash(phoneHash).isPresent()) {
            throw new BusinessException(ErrorCode.ACCOUNT_DELETED);
        }

        // 查找或创建用户
        Optional<User> userOpt = userRepository.findByPhone(phone);
        User user;
        if (userOpt.isEmpty()) {
            user = User.builder()
                    .phone(phone)
                    .nickname("用户_" + phone.substring(7))
                    .role(User.Role.STUDENT)
                    .active(true)
                    .verified(true)
                    .build();
            user = userRepository.save(user);
            log.info("Auto-created user: id={}, phone={}", user.getId(), phone);
        } else {
            user = userOpt.get();
        }

        // 已注销（COMPLETED）用户禁止登录
        java.util.Optional<AccountDeletion> deletion = accountDeletionRepository.findByUserId(user.getId());
        if (deletion.isPresent() && deletion.get().getStatus() == DeletionStatus.COMPLETED) {
            throw new BusinessException(ErrorCode.ACCOUNT_DELETED);
        }

        // 生成 token
        String accessToken = jwtTokenProvider.generateAccessToken(user.getId(), user.getPhone(), Map.of("role", user.getRole().name()));
        String refreshToken = jwtTokenProvider.generateRefreshToken(user.getId(), user.getPhone());

        auditService.logLogin(user.getId(), ipAddress, userAgent, requestId);

        Map<String, Object> result = new HashMap<>();
        result.put("userId", user.getId());
        result.put("phone", user.getPhone());
        result.put("nickname", user.getNickname());
        result.put("role", user.getRole());
        result.put("accessToken", accessToken);
        result.put("refreshToken", refreshToken);
        result.put("expiresIn", 86400);
        return result;
    }

    /**
     * 获取当前用户信息
     */
    public Map<String, Object> getCurrentUser(Long userId) {
        User user = userRepository.findById(userId)
                .orElseThrow(() -> new BusinessException(ErrorCode.USER_NOT_FOUND));

        Map<String, Object> result = new HashMap<>();
        result.put("id", user.getId());
        result.put("phone", user.getPhone());
        result.put("email", user.getEmail());
        result.put("nickname", user.getNickname());
        result.put("avatarUrl", user.getAvatarUrl());
        result.put("role", user.getRole());
        result.put("active", user.getActive());
        result.put("verified", user.getVerified());
        result.put("createdAt", user.getCreatedAt());
        return result;
    }
}