package gorilla

import (
	"fmt"
	"net/http"

	"forge.cadoles.com/wpetit/goweb/service/session"
	"github.com/gorilla/sessions"
)

// Session is an implementation of the session.Session service
// backed by github.com/gorilla/sessions Session
type Session struct {
	sess *sessions.Session
}

// Get retrieve a value from the session
func (s *Session) Get(key string) interface{} {
	return s.sess.Values[key]
}

// Set updates a value in the session
func (s *Session) Set(key string, value interface{}) {
	s.sess.Values[key] = value
}

// Unset remove a value in the session
func (s *Session) Unset(key string) {
	delete(s.sess.Values, key)
}

// AddFlash adds the given flash message to the stack
func (s *Session) AddFlash(flashType session.FlashType, message string) {
	s.sess.AddFlash(message, s.flashKey(flashType))
}

// Flashes retrieves the flash messages of the given types in the stack
func (s *Session) Flashes(flashTypes ...session.FlashType) []session.Flash {
	flashes := make([]session.Flash, 0)
	for _, ft := range flashTypes {
		rawFlashes := s.sess.Flashes(s.flashKey(ft))
		for _, f := range rawFlashes {
			message := fmt.Sprintf("%v", f)
			flashes = append(flashes, session.NewBaseFlash(ft, message))
		}
	}
	return flashes
}

func (s *Session) flashKey(flashType session.FlashType) string {
	return fmt.Sprintf("_%s_flash", flashType)
}

// Save saves the session with its current values
func (s *Session) Save(w http.ResponseWriter, r *http.Request) error {
	return s.sess.Save(r, w)
}

// Delete deletes the session
func (s *Session) Delete(w http.ResponseWriter, r *http.Request) error {
	s.sess.Options = &sessions.Options{
		MaxAge: -1,
	}
	return s.sess.Save(r, w)
}

// NewSession returns a new Session
func NewSession(sess *sessions.Session) *Session {
	return &Session{sess}
}