package sonar

import "net/http"

// FlashAndRedirect to flash and redirect away.
func (s *Sonar) FlashAndRedirect(r *http.Request, w http.ResponseWriter, url string, flash string, v ...string) {
	s.Flash(r, w, flash, v...)
	w.Header().Add("Location", url)
	w.WriteHeader(http.StatusFound)
}

// Flash a message to the user.
func (s *Sonar) Flash(r *http.Request, w http.ResponseWriter, tmpl string, v ...string) {
	session, _ := s.sessions.Get(r, s.Config.CookieName)
	session.AddFlash(tmpl, v...)
	session.Save(r, w)
}

// GetFlashes retrieves the flashed messages.
func (s *Sonar) GetFlashes(r *http.Request, w http.ResponseWriter) []string {
	var result []string
	session, _ := s.sessions.Get(r, s.Config.CookieName)
	if flashes := session.Flashes(); len(flashes) > 0 {
		for _, flash := range flashes {
			result = append(result, flash.(string))
		}
	}
	session.Save(r, w)
	return result
}