FATAL EXCEPTION: main
Process: com.example.myroom, PID: 15937
java.lang.NullPointerException
at com.example.myroom.Utils.getCurrentUserId(Utils.kt:39)
at com.example.myroom.auth.OTPFragment.verifyOtp(OTPFragment.kt:57)
at com.example.myroom.auth.OTPFragment.onLoginButtonClicked$lambda$1(OTPFragment.kt:51)
at com.example.myroom.auth.OTPFragment.$r8$lambda$H1SQCA2m8i1BlLwc7MGU-xAoj_s(Unknown Source:0)
at com.example.myroom.auth.OTPFragment$$ExternalSyntheticLambda1.onClick(D8$$SyntheticClass:0)
at android.view.View.performClick(View.java:7740)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1213)
at android.view.View.performClickInternal(View.java:7710)
at android.view.View.-$$Nest$mperformClickInternal(Unknown Source:0)
at android.view.View$PerformClick.run(View.java:30629)
at android.os.Handler.handleCallback(Handler.java:958)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loopOnce(Looper.java:257)
at android.os.Looper.loop(Looper.java:368)
at android.app.ActivityThread.main(ActivityThread.java:8826)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:572)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1049)

class OTPFragment : Fragment() {
private val viewModel: AuthViewModel by viewModels()
private lateinit var binding: FragmentOTPBinding
private lateinit var userNumber : String
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
binding = FragmentOTPBinding.inflate(layoutInflater)

    getUserNumber()
    customizingEnteringOTP()
    sendOTP()
    onLoginButtonClicked()
    onBackButtonClicked()
    return binding.root
}

private fun onLoginButtonClicked() {
    binding.btnLogin.setOnClickListener{
        Utils.showDialog(requireContext(), "Signing you...")
        val editTexts = arrayOf(binding.etOtp1, binding.etOtp2, binding.etOtp3, binding.etOtp4, binding.etOtp5, binding.etOtp6)
        val otp = editTexts.joinToString("") {it.text.toString()}

        if(otp.length < editTexts.size){
            Utils.showToast(requireContext(), "Please enter valid otp")
        }
        else{
            editTexts.forEach { it.text?.clear() ; it.clearFocus() }
            verifyOtp(otp)
        }
    }
}

private fun verifyOtp(otp: String) {
    val user = Users(uid = Utils.getCurrentUserId() , userPhoneNumber = userNumber , userAddress = null )
    viewModel.signInWithPhoneAuthCredential(otp, userNumber , user)
    lifecycleScope.launch {
        viewModel.isSignedIsSuccessfully.collect{
            if(it){
                Utils.hideDialog()
                Utils.showToast(requireContext() , "Logged In...")
                startActivity(Intent(requireActivity() , UsersMainActivity:: class.java))
                requireActivity().finish()
            }
        }
    }
}

private fun sendOTP() {
    Utils.showDialog(requireContext(), "Sending OTP...")
    viewModel.apply {
        sendOTP(userNumber , requireActivity())
        lifecycleScope.launch {
            otpSent.collect{otpSent->
                if(otpSent){
                    Utils.hideDialog()
                    Utils.showToast(requireContext() , "Otp sent to the number..")
                }
            }
        }
    }
}

private fun onBackButtonClicked() {
    binding.tbOtpFragment.setNavigationOnClickListener{
        findNavController().navigate(R.id.action_OTPFragment_to_signInFragment)
    }
}

private fun customizingEnteringOTP() {

val editTexts = arrayOf(binding.etOtp1, binding.etOtp2, binding.etOtp3, binding.etOtp4, binding.etOtp5, binding.etOtp6)
for (i in editTexts.indices){
editTexts[i].addTextChangedListener ( object : TextWatcher{
override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}

                override fun onTextChanged(number: CharSequence?, start: Int, before: Int, count: Int) {}

                override fun afterTextChanged(s: Editable?) {
                    if (s?.length==1) {
                        if (i < editTexts.size - 1) {
                            editTexts[i + 1].requestFocus()
                        }
                    } else if (s?.length == 0){
                            if ( i>0){
                                editTexts[i - 1].requestFocus()
                            }
                        }
                    }
    } )
    }
}

private fun getUserNumber() {
    val bundle = arguments
    userNumber = bundle?.getString("number").toString()

    binding.tvUserNumber.text = userNumber
}

}