package com.campus.trade.service.admin;

import com.campus.trade.common.BusinessException;
import com.campus.trade.common.StatusCode;
import com.campus.trade.entity.User;
import com.campus.trade.mapper.UserMapper;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import jakarta.servlet.http.HttpSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.nio.charset.StandardCharsets;

@Service
public class UserManageService {

    @Autowired
    private UserMapper userMapper;

    // 用户列表
    public PageInfo<User> list(int pageNum, int pageSize) {
        PageHelper.startPage(pageNum, pageSize);
        return new PageInfo<>(userMapper.selectAll());
    }

    // 封禁用户
    public void ban(Long userId, HttpSession session) {
        User user = userMapper.selectById(userId);
        if (user == null) throw new BusinessException(StatusCode.NOT_FOUND, "用户不存在");
        if ("ADMIN".equals(user.getRole())) {
            throw new BusinessException(StatusCode.FORBIDDEN, "不能封禁管理员");
        }
        user.setStatus("BANNED");
        userMapper.updateStatus(user);
    }

    // 解封用户
    public void unban(Long userId, HttpSession session) {
        User user = userMapper.selectById(userId);
        if (user == null) throw new BusinessException(StatusCode.NOT_FOUND, "用户不存在");
        user.setStatus("NORMAL");
        userMapper.updateStatus(user);
    }

    // 重置密码（重置为 123456）
    public void resetPassword(Long userId, HttpSession session) {
        User user = userMapper.selectById(userId);
        if (user == null) throw new BusinessException(StatusCode.NOT_FOUND, "用户不存在");
        String defaultHash = DigestUtils.md5DigestAsHex(
                "123456".getBytes(StandardCharsets.UTF_8)
        );
        user.setPasswordHash(defaultHash);
        userMapper.updatePassword(user);
    }
}