fun main(args: Array<String>) {

    assert(Prefs2.lastLogin == "")
    assert(Prefs2.updateDate == 0L)

    Prefs2.lastLogin = "some login"
    Prefs2.updateDate = 12345L

    assert(Prefs2.lastLogin == "some login")
    assert(Prefs2.updateDate == 12345L)
}

val preferenceImitator2 = mutableMapOf<String, Any>()

object Prefs2 {
    private const val UPDATE_DATE_KEY = "update_date"
    private const val UPDATE_DATE_DEFAULT = 0L

    private const val LAST_LOGIN_KEY = "Last_login"
    private const val LAST_LOGIN_DEFAULT = ""

    var updateDate: Long
        get() {
            val temp = preferenceImitator2.getLong(UPDATE_DATE_KEY, UPDATE_DATE_DEFAULT)
            println("Get value '$temp' with key '$UPDATE_DATE_KEY'")
            return temp
        }
        set(value) {
            preferenceImitator2.putLong(UPDATE_DATE_KEY, value)
            println("Set value '$value' with key '$UPDATE_DATE_KEY'")
        }

    var lastLogin: String
        get() {
            val temp = preferenceImitator2.getString(LAST_LOGIN_KEY, LAST_LOGIN_DEFAULT)
            println("Get value '$temp' with key '$LAST_LOGIN_KEY'")
            return temp
        }
        set(value) {
            preferenceImitator2.putString(LAST_LOGIN_KEY, value)
            println("Set value '$value' with key '$LAST_LOGIN_KEY'")
        }

    private fun Map<String, Any>.getLong(key: String, default: Long) = this[key] as? Long ?: default
    private fun MutableMap<String, Any>.putLong(key: String, value: Long) { this[key] = value as Any }

    private fun Map<String, Any>.getString(key: String, default: String) = this[key] as? String ?: default
    private fun MutableMap<String, Any>.putString(key: String, value: String) { this[key] = value as Any }
}