PresitanceMANGER

object DataPersistenceManager {
    private const val KEY_TOKEN = "dpm_token"
    private var token: AccessToken? = null

    fun getTokenDetails(c: Context): AccessToken? {
        if(token == null) loadToken(c)
        return token
    }

    fun setToken(c: Context, _token: AccessToken) {
        token = _token
        saveToken(c)
    }

    private fun loadToken(c: Context) {
        val appSharedPrefs = PreferenceManager.getDefaultSharedPreferences(c)
        val gson = Gson()
        val json = appSharedPrefs.getString(KEY_TOKEN, "")
        if (json!!.isEmpty()) return
        val type = object : TypeToken<AccessToken?>() {}.type
        token = gson.fromJson<AccessToken>(json, type)
    }

    private fun saveToken(c: Context) {
        val appSharedPrefs = PreferenceManager.getDefaultSharedPreferences(c)
        val prefsEditor = appSharedPrefs.edit()
        val gson = Gson()
        val json = if(token==null) "" else gson.toJson(token)
        prefsEditor.putString(KEY_TOKEN, json)
        prefsEditor.apply()
    }


}