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* ProjectLaogai
* Copyright 2019-2020 <>
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
package org.mosad.seil0.projectlaogai.controller
import android.content.Context
import android.content.Intent
import android.nfc.NfcAdapter
import android.nfc.Tag
import android.util.Log
import com.afollestad.materialdialogs.MaterialDialog
import com.afollestad.materialdialogs.customview.customView
import com.codebutler.farebot.Utils
import com.codebutler.farebot.card.desfire.DesfireFileSettings
import com.codebutler.farebot.card.desfire.DesfireProtocol
import org.mosad.seil0.projectlaogai.R
import org.mosad.seil0.projectlaogai.controller.preferences.Preferences
import java.lang.Exception
class NFCMensaCard {
companion object {
private const val className = "NFCMensaCard"
private const val appId = 0x5F8415
private const val fileId = 1
* read the current balance and last payment from the mensa card
* @param intent a nfc intent
* @param context the context to show the dialog in
fun readBalance(intent: Intent, context: Context) {
val tag: Tag? = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG)
val isoDep = IsoDep.get(tag)
try {
val card = DesfireProtocol(isoDep)
val settings = Utils.selectAppFile(card, appId, fileId)
if (settings is DesfireFileSettings.ValueDesfireFileSettings) {
val data = try {
} catch (ex: Exception) { 0 }
lookAtMe(context, data, settings.value).show()
} catch (ex: Exception) {
Log.w(className,"could not connect to tag", ex)
* generate the values for current balance and last payment
* if the easter egg is active use schmeckles as currency
* 0.0000075 = 1.11 / 148 / 1000 (dollar / shm / card multiplier)
* @param context the context to access resources
* @param currentRaw the raw card value of the current balance
* @param lastRaw the raw card value of the last payment
* @return the message containing all values
private fun lookAtMe(context: Context, currentRaw: Int, lastRaw: Int): MaterialDialog {
val dialog = MaterialDialog(context)
val current = if (!Preferences.oGiants) {
String.format("%.2f €", (currentRaw.toFloat() / 1000))
} else {
String.format("%.4f shm", (currentRaw.toFloat() * 0.0000075))
val last = if (!Preferences.oGiants) {
String.format("%.2f €", (lastRaw.toFloat() / 1000))
} else {
String.format("%.4f shm", (lastRaw.toFloat() * 0.0000075))
dialog.txtView_current.text = current
dialog.txtView_last.text = context.resources.getString(R.string.mensa_last, last)
return dialog

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