package com.estate.expert.admin.interceptor;

import com.estate.expert.common.auth.IgnoreAuth;
import com.estate.expert.common.domain.Session;
import com.estate.expert.admin.enums.BizResultCode;
import com.estate.expert.admin.service.UserSessionService;
import com.estate.expert.admin.utils.License;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.UnsupportedEncodingException;

/**
 * 用于检查用户是否登录
 * 会话拦截器
 * 
 * @Author code
 * @Date 2023/3/26 11:47
 * @Version 1.0
 */
@Component
@Slf4j
public class SsoSessionInterceptor implements HandlerInterceptor {

    private static final String REQUEST_ATTR_SESSION = "_session_";
    private static final String REQUEST_KEY_TOKEN = "Authorization";

    @Resource
    private UserSessionService userSessionService;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws UnsupportedEncodingException {
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");
        
        // 检查License是否有效
        try {
            License.validateLicense();
        } catch (Exception e) {
            log.error("License验证失败，请求被拒绝: {}", request.getRequestURI());
            // 使用BizResultCode的方式抛出异常，由全局异常处理器处理
            throw e;
        }
        
        if (!(handler instanceof HandlerMethod)) {
            return true;
        }

//        log.info("request uri: {}", request.getRequestURI());
        Session session = null;
        try {
            String token = request.getHeader(REQUEST_KEY_TOKEN).replace("Bearer ", "");
//            log.info("token: {}", token);
            BizResultCode.NO_LOGIN_ERROR.check(StringUtils.isEmpty(token));
            session = userSessionService.touchSession(token);
        } catch (Exception e) {
            IgnoreAuth noLogin = this.getIgnoreAuthAnnotation((HandlerMethod) handler);
            //如果未设置 @IgnoreAuth， 这返回未登录异常
            BizResultCode.NO_LOGIN_ERROR.check(null == noLogin);
        }
        if (session == null) {
            session = new Session();
        }
        request.setAttribute(REQUEST_ATTR_SESSION, session);
        return true;
    }


    private IgnoreAuth getIgnoreAuthAnnotation(HandlerMethod handlerMethod) {
        IgnoreAuth annotation = handlerMethod.getMethodAnnotation(IgnoreAuth.class);
        if (annotation == null) {
            annotation = AnnotationUtils.findAnnotation(handlerMethod.getBeanType(), IgnoreAuth.class);
        }
        return annotation;
    }

}