/**
 * ProjectLaogai
 *
 * Copyright 2019  <seil0@mosad.xyz>
 *
 * 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
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * 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.nfc.tech.IsoDep
import com.afollestad.materialdialogs.MaterialDialog
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 java.lang.Exception

class NFCMensaCard {

    companion object {
        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)
            isoDep.connect()

            val card = DesfireProtocol(isoDep)
            val settings = Utils.selectAppFile(card, appId, fileId)

            if (settings is DesfireFileSettings.ValueDesfireFileSettings) {
                val data = try {
                    card.readValue(fileId)
                } catch (ex: Exception) { 0 }

                MaterialDialog(context)
                    .title(R.string.mensa_credit)
                    .message(text = lookAtMe(context, data, settings.value))
                    .show()
            }
        }

        /**
         * 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): String {
            val current = if (!PreferencesController.oGiants) {
                String.format("%.2f €", (currentRaw.toFloat() / 1000))
            } else {
                String.format("%.4f shm", (currentRaw.toFloat() * 0.0000075))
            }

            val last = if (!PreferencesController.oGiants) {
                String.format("%.2f €", (lastRaw.toFloat() / 1000))
            } else {
                String.format("%.4f shm", (lastRaw.toFloat() * 0.0000075))
            }

            return context.resources.getString(R.string.mensa_current, current) + context.resources.getString(R.string.mensa_last, last)
        }
    }
}