package com.doumee.config.shiro;

import com.alibaba.fastjson.JSON;
import com.doumee.core.model.ApiResponse;
import com.doumee.core.model.LoginUserInfo;
import com.doumee.core.utils.Constants;
import org.apache.commons.lang3.StringUtils;
import org.apache.shiro.cache.Cache;
import org.apache.shiro.cache.MapCache;
import org.apache.shiro.session.Session;
import org.apache.shiro.session.mgt.DefaultSessionKey;
import org.apache.shiro.session.mgt.SessionManager;
import org.apache.shiro.subject.Subject;
import org.apache.shiro.web.filter.authc.FormAuthenticationFilter;
import org.springframework.http.HttpStatus;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletResponse;
import java.io.Serializable;
import java.util.Deque;
import java.util.LinkedList;

/**
 * Shiro认证过滤器，处理未认证情况的响应
 * @author Eva.Caesar Liu
 * @date 2023/04/17 12:11
 */
public class ShiroAuthFilter extends FormAuthenticationFilter {

    public ShiroAuthFilter(SessionManager sessionManager,ShiroCacheManager shiroCacheManager) {
        super();
        this.sessionManager =   (ShiroSessionManager)sessionManager;
        this.cache = shiroCacheManager.getCache("shiro_redis_cache");
    }
    @Override
    protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue)  {
        return false;
    }

    private int maxSession = 1; //最大会话数量

    private boolean kickOutAfter = false;   //踢出前者还是后者
    private Cache<String, Deque<Serializable>> cache; //缓存管理


    private ShiroSessionManager sessionManager;  //会话管理

    @Override
    protected boolean onAccessDenied(ServletRequest request, ServletResponse response) throws Exception {
        Subject subject = getSubject(request, response);
        if (!subject.isAuthenticated() && !subject.isRemembered()) { //如果不是认证过和记住密码的，就直接放行请求，避免造成访问过慢
           // return Boolean.TRUE;
        }
        Session session = subject.getSession(); //获取会话session
        Object principal = subject.getPrincipal();
        Serializable sessionId = session.getId();
        LoginUserInfo userInfo = (LoginUserInfo) principal;
        if(userInfo == null || !Constants.equalsInteger(userInfo.getType(), Constants.UserType.ZHUBO.getKey()) ){
            HttpServletResponse servletResponse = (HttpServletResponse) response;
            servletResponse.setHeader("content-type", "application/json;charset=UTF-8");
            servletResponse.getWriter().write(JSON.toJSONString(ApiResponse.failed(HttpStatus.UNAUTHORIZED.value(), "未登录或登录信息已过期")));
            return Boolean.FALSE;
        }
        String userName = userInfo.getCompanyId() +"_"+ userInfo.getId();
        Deque<Serializable> deque = cache.get(userName);
        if (deque == null) {
            deque = new LinkedList<>();
        }
        if (!deque.contains(sessionId) && session.getAttribute("kickOut") == null) {
            deque.push(sessionId);
            cache.put(userName, deque);
        }
        while (deque.size() > maxSession) {
            Serializable kickOutSessionId;
            if (kickOutAfter) {
                kickOutSessionId = deque.removeFirst();
                cache.put(userName, deque);
            } else {
                kickOutSessionId = deque.removeLast();
                cache.put(userName, deque);
            }

            try {
                Session kickOutSession = sessionManager.getSession(new DefaultSessionKey(kickOutSessionId));
                if (kickOutSession != null){
                    kickOutSession.setAttribute("kickOut", Boolean.TRUE);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        if (session!=null && session.getAttribute("kickOut") != null && (Boolean) session.getAttribute("kickOut") == true) {
            try {
                subject.logout();
                if(deque!=null){
                    deque.remove(sessionId);
                    cache.put(userName, deque);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            saveRequest(request);
            HttpServletResponse servletResponse = (HttpServletResponse) response;
            servletResponse.setHeader("content-type", "application/json;charset=UTF-8");
            servletResponse.getWriter().write(JSON.toJSONString(ApiResponse.failed(HttpStatus.UNAUTHORIZED.value(), "未登录或登录信息已过期")));
            return Boolean.FALSE;
        }
        return Boolean.TRUE;
    }

    public int getMaxSession() {
        return maxSession;
    }

    public void setMaxSession(int maxSession) {
        this.maxSession = maxSession;
    }

    public boolean isKickOutAfter() {
        return kickOutAfter;
    }

    public void setKickOutAfter(boolean kickOutAfter) {
        this.kickOutAfter = kickOutAfter;
    }

    public Cache<String, Deque<Serializable>> getCache() {
        return cache;
    }

    public void setCache(Cache<String, Deque<Serializable>> cache) {
        this.cache = cache;
    }

    public ShiroSessionManager getSessionManager() {
        return sessionManager;
    }

    public void setSessionManager(ShiroSessionManager sessionManager) {
        this.sessionManager = sessionManager;
    }
}