package com.spring.common.util;

import org.springframework.web.context.ContextLoader;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;
import lombok.AccessLevel;
import lombok.NoArgsConstructor;

@NoArgsConstructor(access = AccessLevel.PRIVATE)
public class ApplicationUtil {
    
    public static ServletRequestAttributes getServletRequestAttributes(){
        return (ServletRequestAttributes) RequestContextHolder.currentRequestAttributes();
    }
    //Request 객체 얻기
    public static HttpServletRequest getRequest(){
        return getServletRequestAttributes().getRequest();
    }

    //Set Request Attribute
    public static void setRequestAttributes(String key, Object obj){
        getServletRequestAttributes().setAttribute(key, obj, RequestAttributes.SCOPE_REQUEST);
    }
    //Get Request Attribute
    public static Object getRequestAttributes(String key){
        return getServletRequestAttributes().getAttribute(key, RequestAttributes.SCOPE_REQUEST);
    }

    //Session 객체 얻기
    public static HttpSession getSession(){
        return getRequest().getSession();
    }

    //Set Session Attributes
    public static void setSessionAttributes(String key, Object obj){
        getServletRequestAttributes().setAttribute(key, obj, RequestAttributes.SCOPE_SESSION);
    }

    //Get Session Attributes
    public static Object getSessionAttributes(String key){
        return getServletRequestAttributes().getAttribute(key, RequestAttributes.SCOPE_SESSION);
    }

    //HttpServletResponse 객체 얻기
    public static HttpServletResponse getResponse(){
        return getServletRequestAttributes().getResponse();
    }

    //beanName을 통해서 Bean을 얻을 수 있다.
    public static Object getBean(String beanName){
        var context = ContextLoader.getCurrentWebApplicationContext();
        if (context == null) {
            throw new IllegalStateException("WebApplicationContext를 찾을 수 없습니다.");
        }
        return context.getBean(beanName);
    }

}