package lib

import (
	"crypto/rand"
	"encoding/base64"
	"net/http"
)

const session_cookie_name = "shop_session"

func Get_Session_ID(r *http.Request) string {
	cookie, err := r.Cookie(session_cookie_name)
	if err != nil {
		return ""
	}
	return cookie.Value
}

func Set_Session_ID(w http.ResponseWriter, session_id string) {
	http.SetCookie(w, &http.Cookie{
		Name:     session_cookie_name,
		Value:    session_id,
		Path:     "/",
		HttpOnly: true,
		SameSite: http.SameSiteLaxMode,
		MaxAge:   86400 * 7,
	})
}

func Generate_Session_ID() string {
	b := make([]byte, 32)
	rand.Read(b)
	return base64.URLEncoding.EncodeToString(b)
}

func Get_Or_Create_Session_ID(w http.ResponseWriter, r *http.Request) string {
	session_id := Get_Session_ID(r)
	if session_id == "" {
		session_id = Generate_Session_ID()
		Set_Session_ID(w, session_id)
	}
	return session_id
}