package com.weiwojc.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.weiwojc.mapper.SecretKeyMapper;
import com.weiwojc.model.entity.SecretKey;
import com.weiwojc.service.SecretKeyService;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.UUID;

@Service
@RequiredArgsConstructor
public class SecretKeyServiceImpl implements SecretKeyService {
    
    private final SecretKeyMapper secretKeyMapper;
    
    @Override
    public SecretKey getCurrentSecretKey() {
        LambdaQueryWrapper<SecretKey> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SecretKey::getIsDeleted, false)
                   .last("LIMIT 1");
        
        SecretKey secretKey = secretKeyMapper.selectOne(queryWrapper);
        
        // 如果没有找到密钥，自动初始化一个
        if (secretKey == null) {
            return initializeSecretKey();
        }
        
        return secretKey;
    }
    
    @Override
    @Transactional
    public SecretKey updateSecretKey(String newKey) {
        if (newKey == null || newKey.trim().isEmpty()) {
            throw new RuntimeException("新密钥不能为空");
        }
        
        SecretKey currentKey = getCurrentSecretKey();
        
        // 如果新密钥与当前密钥相同，直接返回
        if (currentKey.getKey().equals(newKey.trim())) {
            return currentKey;
        }
        
        // 先删除当前密钥（逻辑删除）
        currentKey.setIsDeleted(true);
        secretKeyMapper.updateById(currentKey);
        
        // 创建新密钥
        SecretKey newSecretKey = new SecretKey();
        newSecretKey.setKey(newKey.trim());
        newSecretKey.setIsDeleted(false);
        
        secretKeyMapper.insert(newSecretKey);
        return newSecretKey;
    }
    
    @Override
    @Transactional
    public SecretKey initializeSecretKey() {
        // 检查是否已存在密钥
        LambdaQueryWrapper<SecretKey> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SecretKey::getIsDeleted, false);
        
        List<SecretKey> existingKeys = secretKeyMapper.selectList(queryWrapper);
        if (!existingKeys.isEmpty()) {
            return existingKeys.get(0);
        }
        
        // 生成默认密钥
        String defaultKey = "default-secret-key-" + UUID.randomUUID().toString().substring(0, 8);
        
        SecretKey secretKey = new SecretKey();
        secretKey.setKey(defaultKey);
        secretKey.setIsDeleted(false);
        
        secretKeyMapper.insert(secretKey);
        return secretKey;
    }
}