func Login(w http.ResponseWriter, r *http.Request, userId string, userType models.UserType) interface{} {
	username := r.PostFormValue("username")
	password := r.PostFormValue("password")

	var result = map[string]interface{}{"state": "SUCCESS"}
	var ul = buslogic.UserLogic{}

	user, err := ul.Login(username, password)
	if err != nil {
		ErrorHandler(w, r, err)
		return nil
	}
	http.SetCookie(w, &http.Cookie{
		Name:     "user_id",
		Value:    fmt.Sprintf("%x", string(user.Id)),
		Path:     "/",
		Expires:  time.Now().Local().AddDate(1, 0, 0),
		MaxAge:   365 * 24 * 60 * 60,
		HttpOnly: true,
	})
	http.SetCookie(w, &http.Cookie{
		Name:     "username",
		Value:    user.Username,
		Path:     "/",
		Expires:  time.Now().Local().AddDate(1, 0, 0),
		MaxAge:   365 * 24 * 60 * 60,
		HttpOnly: true,
	})
	http.SetCookie(w, &http.Cookie{
		Name:     "user_type",
		Value:    fmt.Sprintf("%d", user.UserType),
		Path:     "/",
		Expires:  time.Now().Local().AddDate(1, 0, 0),
		MaxAge:   365 * 24 * 60 * 60,
		HttpOnly: true,
	})
	switch user.UserType {
	case models.ADMIN:
		result["url"] = "/appointment/admin"
	case models.TEACHER:
		result["url"] = "/appointment/teacher"
	default:
		result["url"] = "/appointment/entry"
	}

	return result
}
func ViewReservationsByTeacher(w http.ResponseWriter, r *http.Request, userId string, userType models.UserType) interface{} {
	var result = map[string]interface{}{"state": "SUCCESS"}
	var ul = buslogic.UserLogic{}
	var rl = buslogic.ReservationLogic{}

	teacher, err := ul.GetUserById(userId)
	if err != nil {
		ErrorHandler(w, r, err)
		return nil
	}
	var teacherJson = make(map[string]interface{})
	teacherJson["teacher_fullname"] = teacher.Fullname
	teacherJson["teacher_mobile"] = teacher.Mobile
	result["teacher_info"] = teacherJson

	reservations, err := rl.GetReservationsByTeacher(userId, userType)
	if err != nil {
		ErrorHandler(w, r, err)
		return nil
	}
	var array = make([]interface{}, 0)
	for _, res := range reservations {
		resJson := make(map[string]interface{})
		resJson["reservation_id"] = res.Id
		resJson["start_time"] = res.StartTime.In(utils.Location).Format(utils.TIME_PATTERN)
		resJson["end_time"] = res.EndTime.In(utils.Location).Format(utils.TIME_PATTERN)
		resJson["teacher_fullname"] = res.TeacherFullname
		resJson["teacher_mobile"] = res.TeacherMobile
		if res.Status == models.AVAILABLE {
			resJson["status"] = models.AVAILABLE.String()
		} else if res.Status == models.RESERVATED && res.StartTime.Before(time.Now().In(utils.Location)) {
			resJson["status"] = models.FEEDBACK.String()
		} else {
			resJson["status"] = models.RESERVATED.String()
		}
		array = append(array, resJson)
	}
	result["reservations"] = array

	return result
}