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())

    private lateinit var apduChannel: ApduChannel

    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 sharedPrefs = getSharedPreferences(applicationInfo.packageName, MODE_PRIVATE)
        binding.etAdm.setText(sharedPrefs.getString("adm", ""))
        apduChannel = ApduChannel(getSystemService(TELEPHONY_SERVICE) as TelephonyManager)

        binding.btnAuth.setOnClickListener {
            val admKey = binding.etAdm.text.toString()
            if (Regex("^\\d{8}$").matches(admKey)) {
                apduChannel.authorize(admKey)
                Toast.makeText(this, "Authorized", Toast.LENGTH_SHORT).show()
                sharedPrefs.edit().putString("adm", admKey).apply()
            } else {
                Toast.makeText(this, "Invalid ADM", Toast.LENGTH_SHORT).show()
            }
        }

        binding.btnReadIccid.setOnClickListener {
            val iccid = apduChannel.readIccid()
            binding.etIccid.setText(iccid)
        }

        binding.btnWriteIccid.setOnClickListener {
            if (!apduChannel.authorized) {
                Toast.makeText(this, "Not authorized", Toast.LENGTH_SHORT).show()
                return@setOnClickListener
            }
            val iccid = binding.etIccid.text.toString()
            if (Regex("^[0-9]{20}$").matches(iccid)) {
                apduChannel.writeIccid(iccid)
                Toast.makeText(this, "ICCID written", Toast.LENGTH_SHORT).show()
            } else {
                Toast.makeText(this, "Invalid ICCID", Toast.LENGTH_SHORT).show()
            }
        }

        binding.btnReadImsi.setOnClickListener {
            val imsi = apduChannel.readImsi()
            binding.etImsi.setText(imsi)
        }

        binding.btnWriteImsi.setOnClickListener {
            if (!apduChannel.authorized) {
                Toast.makeText(this, "Not authorized", Toast.LENGTH_SHORT).show()
                return@setOnClickListener
            }
            try {
                val imsi = binding.etImsi.text.toString()
                if (Regex("^[0-9]{15,18}$").matches(imsi)) {
                    apduChannel.writeImsi(imsi)
                    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()
            }
        }

    }

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