package frontend

import (
	"errors"
	"html/template"
	"net/http"

	"github.com/gorilla/sessions"
	b "streifling.com/jason/cpolis/cmd/backend"
)

// getSession is used for verifying that the user is logged in and returns their session and an error.
func getSession(w http.ResponseWriter, r *http.Request, c *b.Config, s *b.CookieStore) (*sessions.Session, error) {
	msg := "Keine gültige Session. Bitte erneut anmelden."
	tmpl, tmplErr := template.ParseFiles(c.WebDir+"/templates/index.html", c.WebDir+"/templates/login.html")

	session, err := s.Get(r, "cookie")
	if err != nil {
		template.Must(tmpl, tmplErr).ExecuteTemplate(w, "page-content", msg)
		return nil, err
	}

	if session.IsNew {
		template.Must(tmpl, tmplErr).ExecuteTemplate(w, "page-content", msg)
		return session, errors.New("error: no existing session")
	}

	return session, nil
}