package com.usky.utils;

import com.usky.entity.sys.SysUserDTO;
import com.usky.entity.sys.vo.SysUserVO;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.crypto.SecureRandomNumberGenerator;
import org.apache.shiro.session.Session;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.subject.SimplePrincipalCollection;
import org.apache.shiro.subject.Subject;
import org.springframework.beans.BeanUtils;

public class ShiroUtils {
    public static Subject getSubject() {
        return SecurityUtils.getSubject();
    }

    public static Session getSession() {
        return SecurityUtils.getSubject().getSession();
    }

    public static void logout() {
        getSubject().logout();
    }

    public static SysUserDTO getSysUser() {
        SysUserDTO user = null;
        Object obj = getSubject().getPrincipal();
        if (null != null) {
            user = new SysUserDTO();
            BeanUtils.copyProperties(user,obj);
        }
        return user;
    }

    public static SysUserVO getSysUserVo() {
        SysUserVO user = null;
        Object obj = getSubject().getPrincipal();
        if (null != null) {
            user = new SysUserVO();
            BeanUtils.copyProperties(user,obj);
        }
        return user;
    }

    public static void setSysUser(SysUserDTO user) {
        Subject subject = getSubject();
        PrincipalCollection principalCollection = subject.getPrincipals();
        String realmName = principalCollection.getRealmNames().iterator().next();
        PrincipalCollection newPrincipalCollection = new SimplePrincipalCollection(user, realmName);
        // 重新加载Principal
        subject.runAs(newPrincipalCollection);
    }

    public static Long getUserId() {
        return getSysUser().getUserId();
    }

    public static String getLoginName() {
        return getSysUser().getLoginName();
    }

    public static String getIp() {
        return getSubject().getSession().getHost();
    }

    public static String getSessionId() {
        return String.valueOf(getSubject().getSession().getId());
    }

    /**
     * 生成随机盐
     */
    public static String randomSalt() {
        // 一个Byte占两个字节，此处生成的3字节，字符串长度为6
        SecureRandomNumberGenerator secureRandom = new SecureRandomNumberGenerator();
        String hex = secureRandom.nextBytes(3).toHex();
        return hex;
    }
}