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package cn.jiangzeyin.system;


import cn.jiangzeyin.entity.base.AdminOptBaseEntity;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * 系统session 信息
 *
 * @author jiangzeyin
 */
public class SystemSessionInfo implements AdminOptBaseEntity.SystemSessionInfo {

    private static SessionUser sessionUser;

    private static final SystemSessionInfo SESSION_INFO = new SystemSessionInfo();

    /**
     * @param sessionUser sessionUser
     * @author jiangzeyin
     */
    public static void setSessionUser(SessionUser sessionUser) {
        SystemSessionInfo.sessionUser = sessionUser;
        AdminOptBaseEntity.init(SESSION_INFO);
    }

    /**
     * 获取当前操作session 用户名
     *
     * @return name
     * @author jiangzeyin
     */
    public static String getUserName() {
        if (sessionUser == null)
            return "";
        return sessionUser.getUserName();
    }

    /**
     * 获取当前操作session 用户id
     *
     * @return id
     * @author jiangzeyin
     */
    public static int getUserId() {
        if (sessionUser == null)
            return -1;
        return sessionUser.getUserId();
    }

    public static String userIdGetName(int userId) {
        if (sessionUser == null)
            return "";
        return sessionUser.userIdGetName(userId);
    }

    @Override
    public String entityUserIdGetName(int userId) {
        return userIdGetName(userId);
    }

    /**
     * 获取session 信息接口
     *
     * @author jiangzeyin
     */
    public interface SessionUser {

        String getUserName();

        int getUserId();

        String userIdGetName(int userId);
    }

    public static ServletRequestAttributes getServletRequestAttributes() {
        RequestAttributes attributes;
        try {
            attributes = RequestContextHolder.currentRequestAttributes();
        } catch (IllegalStateException e) {
            // TODO: handle exception
            return null;
        }
        ServletRequestAttributes sra = (ServletRequestAttributes) attributes;
        return sra;
    }

    public static HttpServletRequest getRequest() {
        ServletRequestAttributes servletRequestAttributes = getServletRequestAttributes();
        if (servletRequestAttributes == null)
            return null;
        return servletRequestAttributes.getRequest();
    }

    public static HttpSession getSession() {
        HttpServletRequest request = getRequest();
        if (request == null)
            return null;
        return request.getSession();
    }

    public static HttpServletResponse getResponse() {
        ServletRequestAttributes servletRequestAttributes = getServletRequestAttributes();
        if (servletRequestAttributes == null)
            return null;
        return servletRequestAttributes.getResponse();
    }
}