UICCEditor/app/src/main/java/com/example/uicceditor/MainActivity.kt

package com.example.uicceditor

import android.os.Bundle
import android.os.Handler
import android.os.Looper
import android.telephony.TelephonyManager
import android.util.Log
import android.widget.Toast
import androidx.activity.enableEdgeToEdge
import androidx.appcompat.app.AppCompatActivity
import androidx.core.view.ViewCompat
import androidx.core.view.WindowInsetsCompat
import com.example.uicceditor.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {
    private val TAG = "APDU"

    private val handler = Handler(Looper.getMainLooper())
    val AID = "D07002CA44900101"

    private val binding: ActivityMainBinding by lazy {
        ActivityMainBinding.inflate(layoutInflater)
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContentView(binding.root)
        ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main)) { v, insets ->
            val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
            v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
            insets
        }

        val telephonyManager = getSystemService(TELEPHONY_SERVICE) as TelephonyManager

        binding.btnReadIccid.setOnClickListener {
            val apduChannel = ApduChannel(telephonyManager, AID)
            val iccid = apduChannel.readICCID()
            apduChannel.close()
            binding.etIccid.setText(iccid)
        }

        binding.btnWriteIccid.setOnClickListener {
            val iccid = binding.etIccid.text.toString()
            if (Regex("^[0-9]{20}$").matches(iccid)) {
                val apduChannel = ApduChannel(telephonyManager, AID)
                apduChannel.writeICCID(iccid)
                apduChannel.close()
                Toast.makeText(this, "ICCID written", Toast.LENGTH_SHORT).show()
            } else {
                Toast.makeText(this, "Invalid ICCID", Toast.LENGTH_SHORT).show()
            }
        }

        binding.btnReadImsi.setOnClickListener {
            val apduChannel = ApduChannel(telephonyManager, AID)
            val imsi = apduChannel.readIMSI()
            apduChannel.close()
            binding.etImsi.setText(imsi)
        }

        binding.btnWriteImsi.setOnClickListener {
            try {
                val imsi = binding.etImsi.text.toString()
                if (Regex("^[0-9]{15,18}$").matches(imsi)) {
                    val apduChannel = ApduChannel(telephonyManager, AID)
                    apduChannel.writeIMSI(imsi)
                    apduChannel.close()
                    Toast.makeText(this, "IMSI written", Toast.LENGTH_SHORT).show()
                } else {
                    Toast.makeText(this, "Invalid IMSI", Toast.LENGTH_SHORT).show()
                }
            } catch (e: Exception) {
                Log.e(TAG, "Error writing IMSI", e)
                Toast.makeText(this, "Error writing IMSI", Toast.LENGTH_SHORT).show()
            }
        }

        binding.btnReadMsisdn.setOnClickListener {
            val apduChannel = ApduChannel(telephonyManager, AID)
            apduChannel.select(SIMView.FID_MF)
            apduChannel.select(SIMView.FID_DF_TELECOM)
            apduChannel.select(SIMView.FID_EF_MSISDN)
            val msisdn = decMSISDN(apduChannel.readRecord(1, 28).substring(28)) ?: ""
            binding.etMsisdn.setText(msisdn)
            apduChannel.close()
        }

        binding.btnWriteMsisdn.setOnClickListener {
            val msisdn = binding.etMsisdn.text.toString()
            Log.i(TAG, "MSISDN: ${encMSISDN(msisdn)}")
            val apduChannel = ApduChannel(telephonyManager, AID)
            apduChannel.select(SIMView.FID_MF)
            apduChannel.select(SIMView.FID_DF_TELECOM)
            apduChannel.select(SIMView.FID_EF_MSISDN)
            apduChannel.writeRecord(1, encMSISDN(msisdn).padStart(56, 'F'))
            apduChannel.close()
        }

        binding.btnReadPlmn.setOnClickListener {
            val apduChannel = ApduChannel(telephonyManager, AID)
            apduChannel.select(SIMView.FID_MF)
            apduChannel.select(SIMView.FID_DF_GSM)
            apduChannel.select(SIMView.FID_EF_PLMNSEL)
            binding.etPlmn.setText(decPLMN(apduChannel.readBinary(60)))
            apduChannel.close()
        }

        binding.btnReadEhplmn.setOnClickListener {
            val apduChannel = ApduChannel(telephonyManager, AID)
            apduChannel.select(SIMView.FID_MF)
            apduChannel.select(SIMView.FID_DF_GSM)
            apduChannel.select(SIMView.FID_EF_EHPLMN)
            binding.etEhplmn.setText(decPLMN(apduChannel.readBinary(12)))
            apduChannel.close()
        }

        binding.btnReadFplmn.setOnClickListener {
            val apduChannel = ApduChannel(telephonyManager, AID)
            apduChannel.select(SIMView.FID_MF)
            apduChannel.select(SIMView.FID_DF_GSM)
            apduChannel.select(SIMView.FID_EF_FPLMN)
            binding.etFplmn.setText(decPLMN(apduChannel.readBinary(30)))
            apduChannel.close()
        }

        binding.btnReadPlmnwact.setOnClickListener{
            val apduChannel = ApduChannel(telephonyManager, AID)
            apduChannel.select(SIMView.FID_MF)
            apduChannel.select(SIMView.FID_DF_GSM)
            apduChannel.select(SIMView.FID_EF_PLMNWACT)
            binding.etPlmnwact.setText(decPLMNwAcT(apduChannel.readBinary(120)))
            apduChannel.close()
        }

        binding.btnReadOplmnwact.setOnClickListener{
            val apduChannel = ApduChannel(telephonyManager, AID)
            apduChannel.select(SIMView.FID_MF)
            apduChannel.select(SIMView.FID_DF_GSM)
            apduChannel.select(SIMView.FID_EF_OPLMNWACT)
            binding.etOplmnwact.setText(decPLMNwAcT(apduChannel.readBinary(60)))
            apduChannel.close()
        }

        binding.btnReadHplmnwact.setOnClickListener{
            val apduChannel = ApduChannel(telephonyManager, AID)
            apduChannel.select(SIMView.FID_MF)
            apduChannel.select(SIMView.FID_DF_GSM)
            apduChannel.select(SIMView.FID_EF_HPLMNWACT)
            binding.etHplmnwact.setText(decPLMNwAcT(apduChannel.readBinary(20)))
            apduChannel.close()
        }

        binding.btnReset.setOnClickListener {
            val apduChannel = ApduChannel(telephonyManager, AID)
            apduChannel.reset()
            apduChannel.close()
        }
    }

    fun getRandomString(length: Int): String {
        val allowedChars = ('0'..'9')
        return (1..length)
            .map { allowedChars.random() }
            .joinToString("")
    }
}