// loginHandleFunc - render template for login page
func loginHandleFunc(w http.ResponseWriter, r *http.Request) {
	if r.Method == "GET" {
		login := template.Must(getTemlates("login"))
		login.Execute(w, nil)
	} else {
		r.ParseForm()
		// logic part of log in
		user := &m.User{
			Login:    r.FormValue("login"),
			Password: r.FormValue("password"),
		}
		result, err := valid.ValidateStruct(user)
		if err == nil || !result {
			err := user.GetUserByLoginPass(user.Login, user.Password)
			if !err {
				sess := s.Instance(r)
				s.Clear(sess)
				sess.Values["id"] = user.ID
				err := sess.Save(r, w)
				if err != nil {
					log.Println(err)
					return
				}
				url, err := RedirectFunc("home")
				if err != nil {
					http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
					return
				}
				http.Redirect(w, r, url, http.StatusMovedPermanently)
			} else {
				http.Error(w, fmt.Sprintf("User %s not found", user.Login), http.StatusNotFound)
			}
		}
	}
}
// signHandleFunc - render template for sign page
func signHandleFunc(w http.ResponseWriter, r *http.Request) {
	if r.Method == "GET" {
		templates, err := getTemlates("sign")
		sign := template.Must(templates, err)
		sign.Execute(w, nil)
	} else {
		r.ParseForm()
		// logic part of sign in
		user := &m.User{
			Login:    r.FormValue("login"),
			Email:    r.FormValue("email"),
			Password: r.FormValue("password"),
		}
		result, err := valid.ValidateStruct(user)
		if err == nil || !result {
			sess := s.Instance(r)
			s.Clear(sess)
			err := user.CreateUser()
			if err != nil {
				http.Error(w, err.Error(), http.StatusNotAcceptable)
				return
			}
			sess.Values["id"] = user.ID
			err = sess.Save(r, w)
			if err != nil {
				http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
				return
			}
			url, err := RedirectFunc("home")
			if err != nil {
				http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
				return
			}
			http.Redirect(w, r, url, http.StatusMovedPermanently)
		}
	}
}