package com.example.security;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;

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

@Component
public class AuthenticationInterceptor implements HandlerInterceptor {

    @Autowired
    private JwtTokenUtil jwtTokenUtil;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String token = request.getHeader("Authorization");
        
        if (!StringUtils.hasText(token)) {
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            response.setContentType("application/json;charset=UTF-8");
            response.getWriter().write("{\"code\":401,\"message\":\"未登录或登录已过期\"}");
            return false;
        }

        if (token.startsWith("Bearer ")) {
            token = token.substring(7);
        }

        if (!jwtTokenUtil.validateToken(token)) {
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
            response.setContentType("application/json;charset=UTF-8");
            response.getWriter().write("{\"code\":401,\"message\":\"Token无效或已过期\"}");
            return false;
        }

        UserContext userContext = new UserContext();
        userContext.setUserId(jwtTokenUtil.getUserIdFromToken(token));
        userContext.setUsername(jwtTokenUtil.getUsernameFromToken(token));
        userContext.setDeptCode(jwtTokenUtil.getDeptCodeFromToken(token));
        UserContext.setUserContext(userContext);

        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        UserContext.clear();
    }
}